Internal expansion and back pulling clamp for hollow automobile half shaft
Through the design of internal expansion and pulling fixture, the end surface damage caused by the top clamping method in hollow car semi-axis processing is solved, and high-precision workpiece fixation is achieved, meeting the needs of rough car and groove rolling processes.
Patent Information
- Application Number
- CN202422525274.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-17
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-10-17
AI Technical Summary
In the prior art, when processing hollow car half shafts, the commonly used top-tip clamping method is likely to cause damage to the end surface of the shaft body, and the insufficient top-tight force cannot meet the needs of rough trucks or groove rolling processes.
The design of the inner expansion and pulling clamp is adopted, including the fixture chuck, end cover seat, core rod body, internal expansion clamp and movable seat. Through the inner expansion clamp, the inner hole tightening and end face fit of the workpiece is achieved, and the clamping force and clamping accuracy are improved.
It improves clamping force and clamping accuracy, avoids damage to the end surface of the workpiece, and meets the processing requirements of hollow car half-axles.
Smart Images
Figure CN223235094U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of clamp equipment, in particular to an internal expansion and rear-tensioning clamp for a hollow automobile half-axle. Background Art
[0002] A fixture is a device used during the manufacturing process to secure the workpiece in the correct position for construction or testing. Typically, when machining hollow automotive axles, a driven centerpiece is used to hold one end of the shaft, while the other end of the shaft passes through a movable centerpiece. These two centers simultaneously secure the shaft. However, this method can damage the shaft endface, and insufficient clamping force can render it inadequate for rough turning or grooving. Summary of the Invention
[0003] The purpose of the utility model is to solve the above problems and provide an internal expansion and rearward pulling clamp for a hollow automobile half-axle.
[0004] To achieve the above objectives, the present invention employs the following technical solutions: an internal expansion and back-pulling fixture for a hollow automotive half-axle, comprising a fixture chuck having an end cap seat at one end thereof, a core rod axially fixedly disposed within the end cap seat, one end of the core rod extending outward from the end cap seat and inserted into an inner hole of a workpiece, an internal expansion fixture circumferentially sleeved around the core rod and extending into the inner hole of the workpiece, a movable seat movably disposed between the fixture chuck and the end cap seat, linked to the internal expansion fixture, the movable seat being connected to a fixture driver and driven by the fixture driver to slide axially away from the internal expansion fixture, thereby expanding and positioning the chucks of the internal expansion fixture outwardly within the inner hole of the workpiece and forcing the end face of the workpiece against the end cap seat. The internal expansion fixture, along with the core rod, is disposed within the inner hole of the workpiece. Driven by the movable seat, the internal expansion fixture expands and tightens, thereby securing the workpiece and simultaneously moving the workpiece toward the end cap seat, causing the workpiece and the end cap seat to abut against each other, thereby improving stability.
[0005] In the aforementioned internal expansion and tensioning fixture for hollow automotive axles, the fixture includes a clamp base that is movably mounted on a core rod. One end of the clamp base has a plurality of circumferentially evenly distributed internal expansion clamping blocks, which do not extend beyond the end of the core rod. The internal expansion clamping blocks are configured to engage the inner bore of a workpiece to thereby clamp the workpiece.
[0006] In the aforementioned internal expansion and tensioning fixture for hollow automotive axles, the core rod is conical in shape, with its diameter gradually increasing from one end closest to the workpiece to the other. Furthermore, the inner sides of the fixture seat and the internal expansion clamping block have internal expansion slopes that align with the outer sides of the core rod. The core rod is designed to allow the internal expansion clamping block of the fixture seat to expand outward.
[0007] In the above-mentioned internal expansion and pulling clamp for hollow automobile half-axles, a core rod seat is fixedly provided between the clamp chuck and the end cover seat. The core rod seat is cylindrical with one end open and the other end closed, and one end of the core rod body is coaxially integrally formed at the center of the closed end of the core rod seat.
[0008] In the above-mentioned internal expansion and tensioning clamp for hollow automobile half-axles, the open end of the core rod seat is fixedly connected to the clamp chuck by a plurality of first mounting bolts, and the end cover seat is fixedly connected to the closed end of the core rod seat by a plurality of second mounting bolts, and the core rod seat is coaxially distributed with the clamp chuck and the end cover seat respectively.
[0009] In the aforementioned internal expansion and tensioning clamp for hollow automotive axles, the movable seat comprises a movable disc axially movably disposed circumferentially inwardly of a core rod seat. One end of the movable disc comprises a connecting rod extending from the open end of the core rod seat to the inside of the clamp chuck and configured to connect to the clamp driver. The closed end of the core rod seat comprises a plurality of circumferentially evenly distributed movable holes. The other end of the movable disc comprises a plurality of linkage rods that movably pass through the movable holes. The linkage rods are connected to the clamp seat via a linkage assembly. The linkage rods are configured to drive the clamp seat.
[0010] In the aforementioned internal expansion and retraction clamp for hollow automotive axles, the linkage assembly includes a linkage seat movably disposed inside the end cap seat and sleeved outside the clamp seat. An annular stopper is provided on the inner circumferential side of one end of the linkage seat, abutting against the end of the clamp seat proximal to the internal expansion block. The linkage rods have positioning grooves on their ends distal to the movable disc. The linkage seat sleeves on the outer sides of each linkage rod and has an annular engaging portion on the inner circumferential side of its other end, engaging with the positioning grooves. The positioning grooves of the linkage rods engage the annular engaging portion of the linkage seat, enabling movement of the linkage seat when the linkage rods move.
[0011] In the above-mentioned internal expansion and pulling clamp for hollow automobile half-axles, one end of the end cover seat is open and the other end is closed, and the open end of the end cover seat is connected to the closed end of the core rod seat, and the core rod body passes through the through hole in the center of the closed end of the end cover seat.
[0012] In the aforementioned internal expansion and tensioning fixture for hollow automotive axles, the through-hole at the closed end of the end cap seat has an annular inclined surface circumferentially adjacent to the workpiece end. The outer side of the workpiece end surface has an annular chamfered portion located circumferentially inward of the annular inclined surface and capable of abutting against the annular inclined surface. The abutment between the annular inclined surface and the annular chamfered portion improves the clamping precision between the workpiece and the end cap seat.
[0013] In the above-mentioned internal expansion and back-pulling clamp for hollow automobile half-axles, the end of the clamp chuck away from the end cover seat is installed on the end face of the main shaft, and the clamp driver is an oil cylinder.
[0014] Compared with the existing technology, the advantages of this utility model are:
[0015] 1. The device adopts the design of internal expansion and back pulling, which can not only expand the inner hole, but also fit the end face of the workpiece to the fixture by back pulling, which can greatly improve the clamping force and clamping accuracy.
[0016] 2. The device has a simple structure. The clamp seat and the movable disc are combined through the linkage seat. The movable disc is moved to make the clamp seat and the core rod body contact, so that the internal expansion clamp block fixes the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a structural diagram of the present utility model.
[0018] Figure 2 It is a structural sectional view of the present utility model.
[0019] Figure 3 It is a structural explosion diagram of the utility model.
[0020] Figure 4 It is a structural schematic diagram of the middle end cover seat of the utility model.
[0021] Figure 5 It is a structural schematic diagram of the linkage seat in the utility model.
[0022] Figure 6 It is a structural schematic diagram of the clamp seat in the utility model.
[0023] Figure 7 It is a structural schematic diagram of the core rod seat of the utility model.
[0024] Figure 8 It is a structural diagram of the movable disk in the utility model.
[0025] In the figure: the fixture chuck 1, the end cover seat 11, the core rod seat 12, the through hole 13, the annular inclined surface 14, the core rod body 2, the workpiece 3, the annular chamfered portion 31, the internal expansion fixture 4, the fixture seat 41, the internal expansion clamping block 42, the internal expansion inclined surface 43, the movable seat 5, the movable disc body 51, the connecting rod body 52, the movable hole 53, the linkage rod 54, the linkage assembly 6, the linkage seat 61, the annular limiting portion 62, the positioning groove 63, and the annular clamping portion 64. DETAILED DESCRIPTION
[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.
[0027] like Figure 1-8 As shown, an internal expansion and pulling clamp for a hollow automobile half-axle includes a clamp chuck 1, one end of the clamp chuck 1 has an end cover seat 11, a core rod body 2 is axially fixedly inserted in the end cover seat 11, and one end of the core rod body 2 passes through the outside of the end cover seat 11 and is inserted into the inner hole of the workpiece 3, the core rod body 2 is circumferentially sleeved on the outside and extends into the inner hole of the workpiece 3, a movable seat 5 linked to the internal expansion clamp 4 is movably provided between the clamp chuck 1 and the end cover seat 11, the movable seat 5 is connected to a clamp driver and, driven by the clamp driver, the movable seat 5 slides axially in a direction away from the internal expansion clamp 4, so that the various chucks of the internal expansion clamp 4 expand outward and are positioned in the inner hole of the workpiece 3 and the end face of the workpiece 3 rests on the end cover seat 11. The internal expansion clamp 4 is arranged together with the core rod body 2 in the inner hole of the workpiece 3. The internal expansion clamp 4 is expanded and tightened under the drive of the movable seat 5, thereby fixing the workpiece 3 and moving the workpiece 3 toward the end cover seat 11, so that the workpiece 3 and the end cover seat 11 are abutted against each other, thereby improving stability.
[0028] Combine Figure 2 、 Figure 6 and Figure 7 As shown, the internal expansion clamp 4 includes a clamp seat 41 that is movably mounted on the core rod 2. One end of the clamp seat 41 has a plurality of internal expansion clamping blocks 42 evenly distributed around the circumference, and the internal expansion clamping blocks 42 do not extend beyond the end of the core rod 2. The internal expansion clamping blocks 42 are used to fit within the inner hole of the workpiece 3 to clamp the workpiece 3.
[0029] The core rod 2 is conical in shape, with its diameter gradually increasing from one end of the core rod 2 closest to the workpiece 3 to the other end. The inner sides of the clamp seat 41 and the inner expansion clamping block 42 have an inner expansion slope 43 that matches the outer side of the core rod 2. The core rod 2 is designed to allow the inner expansion clamping block 42 of the clamp seat 41 to expand outward.
[0030] like Figure 7 As shown, a core rod seat 12 is fixed between the clamp chuck 1 and the end cover seat 11. The core rod seat 12 is cylindrical with one end open and the other end closed, and one end of the core rod body 2 is coaxially integrally formed at the center of the closed end of the core rod seat 12.
[0031] like Figure 1 As shown, the open end of the core rod seat 12 is fixedly connected to the clamp chuck 1 by a number of first mounting bolts, and the end cover seat 11 is fixedly connected to the closed end of the core rod seat 12 by a number of second mounting bolts. The core rod seat 12 is coaxially distributed with the clamp chuck 1 and the end cover seat 11 respectively.
[0032] Combine Figure 7 and Figure 8As shown, the movable seat 5 includes a movable disc 51 axially movably arranged on the circumferential inner side of the core rod seat 12. One end of the movable disc 51 has a connecting rod 52 extending from the open end of the core rod seat 12 to the inner side of the fixture chuck 1 and used to connect to the fixture driver. The closed end of the core rod seat 12 has a plurality of movable holes 53 evenly distributed along the circumference. The other end of the movable disc 51 has a plurality of linkage rods 54 that movably pass through the movable holes 53. The linkage rods 54 are connected to the fixture seat 41 through the linkage assembly 6. The linkage rods 54 are used to drive the fixture seat 41.
[0033] Combine Figure 5 and Figure 8 As shown, the linkage assembly 6 includes a linkage seat 61 that is movably disposed on the inner side of the end cap seat 11 and sleeved on the outer side of the clamp seat 41. An annular limiting portion 62 is provided on the inner side of one end of the linkage seat 61, which abuts against the end of the clamp seat 41 near the inner expansion clamping block 42. The linkage rod 54 has a positioning groove 63 on the end away from the movable disc 51. The other end of the linkage seat 61 is sleeved on the outer side of each linkage rod 54, and an annular clamping portion 64 is provided on the inner side of the other end of the linkage seat 61, which is mutually engaged with the positioning groove 63. The positioning groove 63 of the linkage rod 54 and the annular clamping portion 64 of the linkage seat 61 are mutually engaged, so that when the linkage rod 54 moves, the linkage seat 61 can be driven to move.
[0034] like Figure 4 As shown, one end of the end cover seat 11 is open and the other end is closed, and the open end of the end cover seat 11 is connected to the closed end of the core rod seat 12, and the core rod body 2 passes through the through hole 13 in the center of the closed end of the end cover seat 11.
[0035] Combine Figure 2 and Figure 4 As shown, the through hole 13 at the closed end of the end cap seat 11 has an annular inclined surface 14 circumferentially adjacent to one end of the workpiece 3, and the outer side of the end surface of one end of the workpiece 3 has an annular chamfered portion 31 located circumferentially inward of the annular inclined surface 14 and capable of abutting against the annular inclined surface 14. The annular inclined surface 14 and the annular chamfered portion 31 abut against each other, thereby improving the clamping accuracy between the workpiece 3 and the end cap seat 11.
[0036] like Figure 1 As shown, one end of the fixture chuck 1 away from the end cover seat 11 is installed on the end face of the main shaft, and the fixture driver is an oil cylinder.
[0037] The principle of this embodiment is:
[0038] The clamp seat 41 is arranged in the linkage seat 61, and the linkage rod 54 on the movable disk body 51 is arranged in the linkage seat 61. The positioning groove 63 on the linkage rod 54 and the annular clamping portion 64 on the linkage seat 61 are clamped with each other, so that when the movable disk body 51 moves, the clamp seat 41 can be driven to move. The inner side of the clamp seat 41 is arranged on the circumferential outside of the core rod body 2. When the clamp seat 41 moves, it contacts the core rod body 2, so that the internal expansion clamping block 42 is squeezed and moved outward, thereby fitting with the inner hole of the workpiece 3. At the same time, the movement of the movable disk body 51 drives the workpiece 3 to move, and the annular chamfered portion 31 of the workpiece 3 contacts the annular inclined surface 14 of the end cover seat 11, realizing the internal expansion and then pulling action, thereby improving the clamping force and clamping accuracy.
[0039] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.
[0040] Although this document frequently uses terms such as fixture chuck 1, end cap seat 11, core rod seat 12, through hole 13, annular inclined surface 14, core rod body 2, workpiece 3, annular chamfered portion 31, internal expansion fixture 4, fixture seat 41, internal expansion clamping block 42, internal expansion inclined surface 43, movable seat 5, movable disc body 51, connecting rod body 52, movable hole 53, linkage rod 54, linkage assembly 6, linkage seat 61, annular limiting portion 62, positioning groove 63, and annular clamping portion 64, the use of other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.
Claims
1. A clamp for internal expansion and back-pulling of hollow automobile axles, comprising a clamp chuck (1), characterized in that: One end of the clamp chuck (1) is provided with an end cover seat (11), a core rod body (2) is axially fixedly inserted in the end cover seat (11), and one end of the core rod body (2) passes through the outside of the end cover seat (11) and is inserted into the inner hole of the workpiece (3), an internal expansion clamp (4) is sleeved on the circumferential outside of the core rod body (2) and extends into the inner hole of the workpiece (3), a movable seat (5) linked to the internal expansion clamp (4) is movably provided between the clamp chuck (1) and the end cover seat (11), the movable seat (5) is connected to a clamp driver, and the movable seat (5) is driven by the clamp driver to slide axially in a direction away from the internal expansion clamp (4), so that each chuck of the internal expansion clamp (4) expands outward and is positioned in the inner hole of the workpiece (3), and the end face of the workpiece (3) abuts against the end cover seat (11).
2. The internal expansion and tensioning fixture for a hollow automobile half-axle according to claim 1, characterized in that: The internal expansion clamp (4) includes a clamp seat (41), the clamp seat (41) is movably mounted on the core rod body (2), and one end of the clamp seat (41) has a plurality of internal expansion clamping blocks (42) evenly distributed in the circumferential direction, and the internal expansion clamping blocks (42) do not exceed the end of the core rod body (2).
3. The internal expansion and tensioning fixture for a hollow automobile half-axle according to claim 2, characterized in that: The core rod body (2) is conical and the diameter of the core rod body (2) gradually increases from one end close to the workpiece (3) to the other end, and the inner sides of the clamp seat (41) and the inner expansion clamping block (42) have an inner expansion inclined surface (43) that matches the outer side surface of the core rod body (2).
4. The internal expansion and tensioning fixture for a hollow automobile half-axle according to claim 2 or 3, characterized in that: A core rod seat (12) is fixedly provided between the clamp chuck (1) and the end cover seat (11); the core rod seat (12) is cylindrical with one end open and the other end closed, and one end of the core rod body (2) is coaxially integrally formed at the center of the closed end of the core rod seat (12).
5. The internal expansion and tensioning fixture for a hollow automobile half-axle according to claim 4, characterized in that: The open end of the core rod seat (12) is fixedly connected to the clamp chuck (1) through a plurality of first mounting bolts, and the end cover seat (11) is fixedly connected to the closed end of the core rod seat (12) through a plurality of second mounting bolts. The core rod seat (12) is coaxially distributed with the clamp chuck (1) and the end cover seat (11).
6. The internal expansion and tensioning fixture for a hollow automobile half-axle according to claim 4, characterized in that: The movable seat (5) includes a movable disk body (51) axially movably arranged on the circumferential inner side of the core rod seat (12), one end of the movable disk body (51) has a connecting rod body (52) extending from the open end of the core rod seat (12) to the inner side of the clamp chuck (1) and used to be connected to the clamp driver, the closed end of the core rod seat (12) has a plurality of movable holes (53) evenly distributed in the circumference, and the other end of the movable disk body (51) has a plurality of linkage rods (54) that movably pass through the movable holes (53), and the linkage rods (54) are connected to the clamp seat (41) through a linkage assembly (6).
7. The internal expansion and tensioning fixture for a hollow automobile half-axle according to claim 6, characterized in that: The linkage assembly (6) includes a linkage seat (61) movably arranged on the inner side of the end cover seat (11) and sleeved on the outer side of the clamp seat (41); the linkage seat (61) has an annular limiting portion (62) on the inner side of one end thereof, which abuts against the end of the clamp seat (41) close to the inner expansion clamping block (42); the linkage rod (54) has a positioning groove (63) on the end away from the movable disk body (51); the other end of the linkage seat (61) is sleeved on the outer side of each linkage rod (54); and the other end of the linkage seat (61) has an annular clamping portion (64) on the inner side thereof, which is clamped with the positioning groove (63).
8. The internal expansion and tensioning fixture for a hollow automobile half-axle according to claim 4, characterized in that: The end cover seat (11) is open at one end and closed at the other end, and the open end of the end cover seat (11) is connected to the closed end of the core rod seat (12), and the core rod body (2) passes through the through hole (13) at the center of the closed end of the end cover seat (11).
9. The internal expansion and tensioning fixture for a hollow automobile half-axle according to claim 8, characterized in that: The through hole (13) at the closed end of the end cover seat (11) has an annular inclined surface (14) circumferentially close to one end of the workpiece (3), and the outer side of the end surface of one end of the workpiece (3) has an annular chamfered portion (31) located on the circumferential inner side of the annular inclined surface (14) and capable of abutting against the annular inclined surface (14).
10. The internal expansion and tensioning fixture for a hollow automobile half-axle according to claim 8, characterized in that: The end of the clamp chuck (1) away from the end cover seat (11) is installed on the end face of the main shaft, and the clamp driver is an oil cylinder.