Positioning clamp for bearing production and processing
By designing a fixture structure with movable and fixed jaws, rapid adaptation to bearings of different diameters and specifications was achieved, solving the problems of cumbersome operation and high cost in existing technologies, and improving machining accuracy and efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHONGSHAN MURAKAMI BEARING CO LTD
- Filing Date
- 2025-07-21
- Publication Date
- 2026-06-19
AI Technical Summary
Existing positioning fixtures for bearing production and processing require changing clamping blocks or the entire fixture when processing bearings of different diameters and specifications. This is cumbersome, time-consuming, and costly, and also results in a large amount of fixture reserves.
Design a positioning fixture including a movable jaw and a fixed jaw. The movable jaw has multiple rotatable arc-shaped clamping surfaces through a slider and a first clamping block, and the fixed jaw has a corresponding arc-shaped clamping surface through a second clamping block. The rotation of both jaws is locked synchronously by a locking component, so as to achieve rapid adaptation of bearings of different sizes.
It improves the versatility of the fixture, reduces the amount of fixtures in stock and the time required for replacement, ensures precise alignment of the clamping surfaces, and improves machining accuracy.
Smart Images
Figure CN224373453U_ABST
Abstract
Description
Technical Field
[0001] This utility model specifically relates to a positioning fixture for bearing production and processing. Background Technology
[0002] In the bearing manufacturing process, positioning fixtures are key equipment to ensure machining accuracy. They need to stably hold bearing blanks or semi-finished products to facilitate machining processes such as grinding, drilling, and chamfering. Existing bearing positioning fixtures typically use clamping surfaces of fixed dimensions. When machining bearings of different diameters, it is necessary to change the corresponding clamping blocks or the entire fixture set. This is not only cumbersome and time-consuming to operate and change, but also results in a large number of fixtures in stock and high production costs. Utility Model Content
[0003] In view of the defects of the existing technology, the technical problem to be solved by this utility model is to provide a positioning fixture for bearing production and processing.
[0004] A positioning fixture for bearing manufacturing includes a base and a movable jaw and a fixed jaw respectively disposed on the base. The movable jaw and the fixed jaw are arranged opposite to each other to form a workpiece clamping space. The base is provided with a driving member that can drive the movable jaw to move closer to or away from the fixed jaw. The movable jaw includes a slider and a first clamping block rotatably disposed on the slider. The first clamping block has a plurality of first arc-shaped clamping surfaces evenly distributed along its circumference, and the plurality of first arc-shaped clamping surfaces can protrude outward one side of the slider as the first clamping block rotates. The fixed jaw includes a second clamping block rotatably disposed on the base. The second clamping block has a plurality of second arc-shaped clamping surfaces evenly distributed along its circumference, and the plurality of second arc-shaped clamping surfaces are arranged in a one-to-one correspondence with the plurality of first arc-shaped clamping surfaces. The base is provided with a locking member that can simultaneously lock the rotation of the first clamping block and the second clamping block.
[0005] In one embodiment, the locking member includes a rack, a first gear, and a second gear. The first gear is fixedly mounted on a second clamping block at the same center. A rotating shaft is provided at the center of the first clamping block. A limiting groove is recessed inward along the axial direction of one side of the rotating shaft. The second gear is movably sleeved on the rotating shaft and has a flange on its inner side that cooperates with the limiting groove, so that the second gear can rotate with the rotating shaft and can be displaced along the axial direction of the rotating shaft. The rack is movably mounted on the base and meshes with the first gear and the second gear respectively. A plurality of first pin holes are evenly distributed along the axial direction of the rack. The plurality of first pin holes are correspondingly arranged with a plurality of first arc-shaped clamping surfaces. A first pin that can cooperate with the first pin holes is movably inserted into the base.
[0006] In one embodiment, a first spring is sleeved on the rotating shaft and located between the slider and the second gear.
[0007] In one embodiment, the second gear is provided with a pull rod, one end of which passes through the first clamping block and is provided with a pull ring.
[0008] In one embodiment, the first clamping block has a plurality of second pin holes evenly distributed along its circumference, and the plurality of second pin holes are arranged in a one-to-one correspondence with a plurality of first arc-shaped clamping surfaces. The slider is inserted vertically with a second pin shaft that can be inserted and engaged with the second pin holes, and the lower end of the second pin shaft can abut against the second gear.
[0009] In one embodiment, a limiting flange is provided at the lower end of the second pin, and a second spring is sleeved on the second pin between the limiting flange and the slider.
[0010] In one embodiment, the driving component includes a lead screw rotatably mounted on a base and a guide groove mounted on the base. The length direction of the guide groove is aligned with the length direction of the lead screw. The slider is movably mounted in the guide groove and threadedly connected to the lead screw. The rack, the first gear, and the second gear are all housed within the guide groove.
[0011] In one embodiment, mounting slots are provided on both sides of the base.
[0012] In one embodiment, the diameters of the arc surfaces of the plurality of first arc-shaped clamping surfaces are not equal.
[0013] In summary, the advantages of this utility model over the prior art are:
[0014] This invention features a first clamping block with movable jaws and a second clamping block with fixed jaws, each equipped with several arc-shaped clamping surfaces. By rotating the clamping blocks, different sizes of clamping surfaces can be switched one by one, allowing for the processing of bearings of various diameters without the need to replace the clamping blocks. This significantly improves the versatility of the fixture and reduces the amount of fixtures needed and the time required for replacement. Furthermore, the first and second arc-shaped clamping surfaces are arranged in a one-to-one correspondence, and with the locking mechanism that locks synchronously, it ensures that the clamping surfaces on both sides are precisely aligned when switching clamping specifications, avoiding positioning offset caused by misalignment and improving processing accuracy. Attached Figure Description
[0015] Figure 1 This is one perspective view of a positioning fixture for bearing manufacturing and processing according to one embodiment of the present utility model;
[0016] Figure 2 This is a cross-sectional view of a positioning fixture for bearing manufacturing in one embodiment of the present invention;
[0017] Figure 3 This is a second perspective view of a positioning fixture for bearing manufacturing and processing according to one embodiment of the present utility model;
[0018] Figure 4This is a perspective view of the first clamping block in one embodiment of the present invention. Detailed Implementation
[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:
[0020] like Figures 1 to 4 The present invention preferably provides a positioning fixture for bearing manufacturing, comprising a base 1 and a movable jaw 2 and a fixed jaw 3 respectively disposed on the base 1. The movable jaw 2 and the fixed jaw 3 are arranged opposite to each other to form a workpiece clamping space. The base 1 is provided with a driving member 4 that can drive the movable jaw 2 to move closer to or away from the fixed jaw 3. The movable jaw 2 includes a slider 5 and a first clamping block 6 rotatably disposed on the slider 5. The first clamping block 6 has a plurality of first arc-shaped clamping surfaces 7 evenly distributed around its circumference. The plurality of first arc-shaped clamping surfaces 7 can protrude outward one by one from one side of the slider 5 as the first clamping block 6 rotates. The fixed jaw 3 includes a second clamping block 8 rotatably disposed on the base 1. The second clamping block 8 has a plurality of second arc-shaped clamping surfaces 9 evenly distributed around its circumference. The plurality of second arc-shaped clamping surfaces 9 are arranged in a one-to-one correspondence with the plurality of first arc-shaped clamping surfaces 7. The base 1 is provided with a locking member 10 that can simultaneously lock the rotation of the first clamping block 6 and the second clamping block 8.
[0021] Specifically, the movable jaw consists of a slider and a first clamping block. The slider is connected to the driving component and can slide along the base. The first clamping block is rotatably mounted on the slider via a bearing. It has 3-6 first arc-shaped clamping surfaces evenly distributed in the circumferential direction (the specific number can be set according to the specifications of commonly used bearings). The curvature radius of each first arc-shaped clamping surface is different, which can be adapted to the outer or inner circle of bearings of different diameters. When the first clamping block is rotated, several first arc-shaped clamping surfaces can protrude outward one by one from the side of the slider facing the fixed jaw, that is, each rotation can switch a corresponding first arc-shaped clamping surface as the working clamping surface; the fixed jaw includes a second clamping block, which is rotatably mounted on the base via a rotating shaft. The second clamping block has the same number of second arc-shaped clamping surfaces evenly distributed in its circumferential direction as the first arc-shaped clamping surfaces, and the radius of curvature of each second arc-shaped clamping surface is adapted to the corresponding first arc-shaped clamping surface (for example, when the first arc-shaped clamping surface clamps the outer circle of the bearing, the second arc-shaped clamping surface simultaneously clamps the same outer circle of the bearing, and the two have the same or adapted radii of curvature). The locking component is mounted on the base. When the first clamping block and the second clamping block are rotated to make the target first arc-shaped clamping surface correspond to the second arc-shaped clamping surface, the locking component can simultaneously lock the rotation of both to ensure that the position of the clamping surface remains unchanged during the processing.
[0022] Further, the locking member 10 includes a rack 11, a first gear 12, and a second gear 13. The first gear 12 is fixedly mounted on the second clamping block 8 at the same center. A rotating shaft 14 is provided at the center of the first clamping block 8. A limiting groove 15 is recessed inward along the axial direction of the rotating shaft 14. The second gear 13 is movably sleeved on the rotating shaft 14 and has a flange on its inner side that cooperates with the limiting groove 15, so that the second gear 13 can rotate with the rotating shaft 14 and can be displaced along the axial direction of the rotating shaft 14. The rack 11 is movably mounted on the base 1, and the rack 11 meshes with the first gear 12 and the second gear 13 respectively. A plurality of first pin holes 16 are evenly distributed along the axial direction of the rack 11. The plurality of first pin holes 16 are correspondingly arranged with a plurality of first arc-shaped clamping surfaces 7. A first pin 17 that can cooperate with the first pin holes 16 is movably inserted into the base 1.
[0023] Specifically, the rack is movably mounted on the base via a slide rail slider, with its length direction parallel to the sliding direction of the movable jaws. The rack meshes with the first gear and the second gear, forming a gear and rack transmission mechanism. Several first pin holes are evenly distributed along the axial direction on the rack, the number of which matches the number of first arc-shaped clamping surfaces, and each first pin hole corresponds to a working position of a first arc-shaped clamping surface. First pins are movably inserted into the base corresponding to the positions of the first pin holes. When a first pin is inserted into a particular first pin hole, the rack is locked and fixed, thereby synchronously locking the rotation of the first gear (i.e., the second clamping block) and the second gear (i.e., the first clamping block) through gear transmission.
[0024] During operation, pulling out the first pin allows the rack to be pushed, or the first gear or the second gear to be rotated simultaneously, causing the first and second gears to rotate synchronously. This, in turn, causes the second and first clamping blocks to rotate synchronously, switching their clamping surfaces. After switching, inserting the first pin into the corresponding first pin hole completes the locking. Furthermore, when the drive component requires the slider to move, the second gear can be manually pushed to disengage it from the rack, thus achieving the slider's displacement.
[0025] Furthermore, a first spring 18 is sleeved on the rotating shaft 14 and located between the slider 5 and the second gear 13. Specifically, in its natural state, the first spring is compressed, and its elastic force pushes the second gear away from the slider along the rotating shaft axis, ensuring that the second gear always maintains a tendency to mesh with the rack. This prevents the second gear from disengaging from the rack in non-operating states, thus avoiding transmission failure and ensuring the transmission reliability of the locking component. When it is necessary to disengage the second gear from the rack, the elastic force of the first spring must be overcome to pull the second gear towards the slider.
[0026] Furthermore, the second gear 13 is provided with a pull rod 19, one end of which passes through the first clamping block 6 and is provided with a pull ring 20. Specifically, the pull ring is convenient for the operator to hold and pull. When the driving component needs to drive the slider to move, the slider can be moved by manually pushing the second gear to disengage it from the rack.
[0027] Furthermore, the first clamping block 6 has a plurality of second pin holes 21 evenly distributed along its circumference, and the plurality of second pin holes 21 are arranged one-to-one with a plurality of first arc-shaped clamping surfaces 7. The slider 5 has a second pin 22 inserted vertically and vertically, which can be inserted and engaged with the second pin holes 21, and the lower end of the second pin 22 can abut against the second gear 13. Specifically, when the second gear is displaced upward by force and disengages from the rack, the second gear can abut against and drive the second pin to move upward synchronously, thereby causing the second pin to be inserted into the second pin hole of the first clamping block, so as to lock the first clamping block, thereby effectively preventing the first clamping block from rotating and deviating when the slider is displaced, resulting in the clamping surfaces of the first clamping block and the second clamping block not corresponding.
[0028] Furthermore, a limiting flange 23 is provided at the lower end of the second pin 22, and a second spring 24 is sleeved on the second pin 22 and located between the limiting flange 23 and the slider 5. Specifically, in its natural state, the second spring is in a compressed state, and its elastic force pushes the second pin downward through the limiting flange, so that the second pin always tends to disengage from the second pin hole.
[0029] Furthermore, the driving component 4 includes a lead screw 25 rotatably mounted on the base 1 and a guide groove 26 mounted on the base 1. The length direction of the guide groove 26 is aligned with the length direction of the lead screw 25. The slider 5 is movably mounted within the guide groove 26 and threadedly connected to the lead screw 25. The rack 11, the first gear 12, and the second gear 13 are all housed within the guide groove 26. Specifically, when it is necessary to drive the slider to move along the guide groove to adjust the distance between the movable jaw and the fixed jaw, the second gear must first be pulled by the pull rod to overcome the elastic force of the first spring, causing the second gear to move axially towards the slider and disengage from the rack. Then, the lead screw is rotated to drive the slider to move, avoiding interference between the second gear and the rack during the slider's movement.
[0030] Furthermore, mounting slots 27 are provided on both sides of the base 1. Specifically, the mounting slots are elongated holes. When the fixture is installed on the processing equipment, the bolts pass through the mounting slots and connect to the threaded holes on the worktable of the equipment. By adjusting the position of the bolts in the mounting slots, the position of the fixture as a whole on the equipment can be finely adjusted, facilitating precise alignment with the processing station of the processing equipment and improving installation convenience and positioning accuracy.
[0031] Furthermore, the diameters of the arc surfaces of several first arc-shaped clamping surfaces 7 are not equal.
[0032] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A positioning fixture for bearing manufacturing, comprising a base (1) and a movable jaw (2) and a fixed jaw (3) respectively disposed on the base (1), wherein the movable jaw (2) and the fixed jaw (3) are disposed opposite to each other and form a workpiece clamping space, and the base (1) is provided with a driving member (4) capable of driving the movable jaw (2) to move closer to or further away from the fixed jaw (3), characterized in that: The movable jaw (2) includes a slider (5) and a first clamping block (6) rotatably mounted on the slider (5). The first clamping block (6) has a plurality of first arc-shaped clamping surfaces (7) evenly distributed along the circumference. The plurality of first arc-shaped clamping surfaces (7) can protrude outward one by one from one side of the slider (5) as the first clamping block (6) rotates. The fixed jaw (3) includes a second clamping block (8) rotatably mounted on the base (1). The second clamping block (8) has a plurality of second arc-shaped clamping surfaces (9) evenly distributed along the circumference. The plurality of second arc-shaped clamping surfaces (9) are arranged in a one-to-one correspondence with the plurality of first arc-shaped clamping surfaces (7). A locking member (10) is provided on the base (1) to lock the rotation of the first clamping block (6) and the second clamping block (8) simultaneously.
2. The positioning fixture for bearing manufacturing and processing according to claim 1, characterized in that: The locking member (10) includes a rack (11), a first gear (12), and a second gear (13). The first gear (12) is fixedly mounted on the second clamping block (8) at the same center. A rotating shaft (14) is provided at the center of the first clamping block (6). A limiting groove (15) is recessed inward along the axial direction on one side of the rotating shaft (14). The second gear (13) is movably sleeved on the rotating shaft (14) and has a flange on its inner side that cooperates with the limiting groove (15), so that the second gear (13) can move with the rotating shaft (14). The rotating shaft (14) rotates and can be displaced along the axial direction of the rotating shaft (14). The rack (11) is movably mounted on the base (1), and the rack (11) meshes with the first gear (12) and the second gear (13) respectively. A number of first pin holes (16) are evenly distributed along the axial direction of the rack (11). The number of first pin holes (16) are corresponding to a number of first arc-shaped clamping surfaces (7). A first pin (17) that can cooperate with the first pin hole (16) is movably inserted into the base (1).
3. A positioning fixture for bearing manufacturing and processing according to claim 2, characterized in that: A first spring (18) is fitted on the rotating shaft (14) and between the slider (5) and the second gear (13).
4. A positioning fixture for bearing manufacturing and processing according to claim 2, characterized in that: The second gear (13) is provided with a pull rod (19), one end of which passes through the first clamping block (6) and is provided with a pull ring (20).
5. A positioning fixture for bearing manufacturing and processing according to claim 2, characterized in that: The first clamping block (6) has several second pin holes (21) evenly distributed along the circumference. The several second pin holes (21) are arranged in a corresponding manner with several first arc-shaped clamping surfaces (7). The slider (5) has a second pin shaft (22) that can be inserted and cooperated with the second pin holes (21) and the lower end of the second pin shaft (22) can abut against the second gear (13).
6. A positioning fixture for bearing manufacturing and processing according to claim 5, characterized in that: The second pin (22) has a limiting flange (23) at its lower end, and a second spring (24) is sleeved on the second pin (22) between the limiting flange (23) and the slider (5).
7. A positioning fixture for bearing manufacturing and processing according to claim 2, characterized in that: The driving component (4) includes a lead screw (25) rotatably mounted on the base (1) and a guide groove (26) mounted on the base (1). The length direction of the guide groove (26) is in the same direction as the length direction of the lead screw (25). The slider (5) is movably mounted in the guide groove (26) and threadedly connected to the lead screw (25). The rack (11), the first gear (12) and the second gear (13) are all housed in the guide groove (26).
8. A positioning fixture for bearing manufacturing and processing according to claim 1, characterized in that: The base (1) has mounting slots (27) on both sides.
9. A positioning fixture for bearing manufacturing and processing according to claim 1, characterized in that: The diameters of the arc surfaces of several first arc-shaped clamping surfaces (7) are not equal.