优化skill，添加特征树、编辑窗口
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# Bearing housing reference
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Read this file when the request is for a bearing housing, bearing seat, bearing
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support, pillow block, flanged bearing housing, cartridge bearing holder,
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`轴承座`, `轴承支座`, `轴承座壳体`, or `带座轴承` housing.
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This reference improves first-pass geometry structure only. It does not certify
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bearing fit, tolerance class, coaxiality, lubrication, load capacity, sealing,
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casting quality, or manufacturability.
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## Object boundary
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By default, model the machined housing/seat part that supports a bearing. Do not
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model the rolling elements, cage, shaft, bolts, grease nipple, seals, or a full
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mounted-bearing assembly unless the user explicitly asks for those as separate
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parts.
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If the prompt says `bearing`, `bearing seat`, or `轴承座` without more detail,
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the semantic core is the support body with a bearing bore and mounting features.
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## Recognition
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Use this reference when the request includes:
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- English: bearing housing, bearing seat, bearing support, pillow block,
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plummer block, flanged bearing housing, cartridge bearing holder.
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- Chinese: 轴承座, 轴承支座, 轴承座壳体, 立式轴承座, 法兰轴承座, 带座轴承.
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- Adjacent intent: shaft clearance, bearing bore, bearing pocket, mounting feet,
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flange mount, bolt holes, cap, split housing, support ribs, grease port.
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## Core invariants
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A generated bearing housing should include:
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- A bearing bore or bearing pocket sized by a named bearing outer diameter.
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- A shaft clearance axis coaxial with the bearing bore.
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- Material around the bore thick enough to read as support, not just a thin ring.
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- A mounting method: base feet, flange, side lugs, or plate mount.
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- Mounting holes with symmetric placement relative to the functional datum.
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- A stable datum convention: bearing axis and mounting face are primary.
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- Edge relief: practical chamfers/fillets after major cuts.
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For a pillow-block style housing, the minimum recognizable structure is:
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- Flat base.
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- Raised bearing boss or arched support.
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- Horizontal bearing bore through the support.
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- Two base mounting holes.
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- Optional ribs connecting boss to base.
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## Default strategy
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When under-specified, generate a simple pillow-block bearing housing:
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- Bearing axis along X.
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- Flat rectangular base on the XY plane.
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- Bearing center above the base by `bearing_center_height`.
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- Cylindrical or rounded boss around the bearing bore.
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- Coaxial through bore for shaft clearance plus a larger bearing seat/pocket.
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- Two elongated or round mounting holes in the base, symmetric about the Y axis.
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- Two ribs from base to bearing boss if there is enough room.
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- Fillets/chamfers last.
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Do not default to a full assembly. Do not default to visible bearing balls. Do
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not default to a random bracket with holes but no bearing bore.
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## Common variants
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### Pillow block / plummer block
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- Base-mounted housing with horizontal bearing axis.
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- Two or four mounting holes in the base.
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- Raised central boss, arch, or saddle around the bore.
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- Optional split cap only if the user asks for split housing or cap bolts.
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### Flanged bearing housing
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- Circular, square, oval, or diamond flange around the bearing bore.
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- Bearing axis usually normal to the flange face.
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- Bolt holes arranged on a bolt circle or symmetric flange pattern.
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- Optional pilot lip or locating register on the mounting face.
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### Plate-mounted bearing seat
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- Flat or block-like plate with bearing pocket.
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- Bearing axis may be normal to the plate.
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- Mounting holes belong to the plate datum, not random locations.
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### Split bearing housing
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- Lower base and upper cap are separate parts or clearly separated bodies.
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- Cap bolts and split plane must be represented if split form is requested.
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- If source-level assembly is not needed, a simplified monolithic split-line
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groove is acceptable, but label the assumption.
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### Cartridge bearing holder
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- Cylindrical sleeve-like body with flange or clamp features.
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- Bearing pocket and shaft clearance are coaxial.
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- Include retaining shoulder or snap-ring groove when requested.
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## Required parameter roles
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Use semantic parameters before modeling:
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- `bearing_outer_diameter`
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- `bearing_width`
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- `shaft_diameter`
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- `shaft_clearance_diameter`
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- `bearing_bore_diameter`
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- `bearing_bore_depth`
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- `bearing_center_height`
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- `wall_thickness`
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- `base_length`
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- `base_width`
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- `base_thickness`
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- `mount_hole_diameter`
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- `mount_hole_spacing_x`
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- `mount_hole_spacing_y`
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- `boss_outer_diameter`
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- `boss_width`
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- `flange_outer_diameter`
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- `flange_thickness`
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- `bolt_count`
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- `bolt_circle_diameter`
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- `rib_thickness`
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- `fillet_radius`
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Only define optional parameters used by the selected variant.
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## Feature roles to plan explicitly
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Use these roles in the CAD brief and source structure:
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- `mounting_base`
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- `bearing_boss`
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- `bearing_seat_bore`
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- `shaft_clearance_bore`
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- `mounting_holes`
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- `flange_mount`
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- `pilot_lip`
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- `support_ribs`
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- `split_cap`
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- `cap_bolts`
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- `retaining_groove`
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- `grease_port`
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- `datum_mounting_face`
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- `datum_bearing_axis`
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## Construction sequence
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1. Select the variant from the prompt. If no variant is specified, use pillow
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block.
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2. Define the datum system:
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- pillow block: base bottom face is Z=0; bearing axis is X.
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- flanged housing: flange mounting face is the primary plane; bore axis is
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normal to it.
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3. Build the base, flange, or plate body first.
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4. Add the bearing boss/support body and ensure it intersects the base/flange.
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5. Cut the shaft clearance bore and bearing seat coaxially.
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6. Cut mounting holes using symmetric positions or bolt circle pattern.
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7. Add ribs only when they intersect both base/flange and boss.
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8. Add optional split line, cap features, grease port, retaining groove, or pilot
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lip if requested.
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9. Apply chamfers and fillets last.
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For through bores and mounting holes, overshoot cutting tools through the target
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faces. Avoid coplanar cutting tools.
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## Common failures to prevent
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- A generic bracket with no bearing bore.
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- A ring with no mounting method.
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- Bearing bore and shaft clearance not coaxial.
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- Missing bearing center height in pillow-block form.
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- Mounting holes asymmetric when the variant implies symmetry.
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- Ribs that float or only touch at an edge.
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- Base thinner than mounting-hole diameter without reason.
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- Side openings or decorative slots with no bearing-seat purpose.
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- Generating balls, cages, shafts, fasteners, or seals when the user asked only
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for the housing.
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- Confusing bearing housing with shaft, flange, or motor mount.
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## Validation targets
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After generation, inspect or reason about:
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- Bearing bore diameter/depth and shaft clearance diameter.
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- Coaxiality of bearing bore and shaft clearance.
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- Bearing center height above mounting face for pillow-block form.
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- Base or flange dimensions and thickness.
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- Mounting-hole count, size, and symmetry or bolt-circle diameter.
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- Boss wall thickness around bearing seat.
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- Rib attachment to both base/flange and boss when ribs exist.
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- Single connected solid unless the user requested an assembly or split housing.
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