Special-shaped post-pulling clamp for gear part

Abstract

The utility model discloses a special-shaped post-pulling fixture for gear parts, which comprises a main body, a fixed seat and a pull rod, a through hole is arranged in the main body, one end of the pull rod is arranged in the through hole, the other end of the pull rod is connected with the fixed seat, and a boss is arranged on the main body. The utility model provides a special-shaped backward-pulling clamp for a gear part, which is used for clamping the interior of one end of the gear part and is convenient to position and align.

Description

Technical Field

[0001] The utility model belongs to the technical field of machining fixtures, and in particular relates to a special-shaped back-pulling fixture for gear parts. Background Art

[0002] A gear-shaped part needs to be clamped on a lathe to turn its inner hole. However, since the outer side wall of the part is provided with gear teeth, it is not easy to use the three-jaw chuck on the lathe to clamp it.

[0003] In the prior art, such as the one disclosed in Chinese patent publication CN 214024563 U, a fixture for machining the inner bore of a thin-walled gear lathe is described. The end surface of the fixture base is recessed downward to form a storage chamber for accommodating the thin-walled gear body. The end face pressure cover is disposed relative to the fixture base and is used to compress the thin-walled gear body. The end face pressure cover is annular and has an opening in its center. A lathe tool extends through the opening into the storage chamber for machining the thin-walled gear body. The fixture base is also provided with a fixing unit for securing the fixture base to the lathe chuck. However, the prior art method, by matching the tooth grooves of the thin-walled gear with the gear teeth, essentially clamps the gear from the outer wall, which can easily damage the gear teeth during the clamping process. Utility Model Content

[0004] The utility model aims to provide a special-shaped back-pull fixture for gear parts, which solves the problem in the prior art that the outer wall of the gear is clamped and the gear teeth are easily damaged.

[0005] To this end, the utility model provides a special-shaped back-pulling clamp for gear parts, including: a main body, a fixed seat and a pull rod, wherein a through hole is provided inside the main body, one end of the pull rod is provided in the through hole, and the other end of the pull rod is connected to the fixed seat, and a boss is provided on the main body.

[0006] Preferably, the main body includes a fixing portion, a raised portion and a separating portion, two ends of the raised portion are respectively connected to the fixing portion and the separating portion, and the boss is provided at one end of the separating portion.

[0007] Preferably, the diameter of the raised portion is larger than the diameters of the fixing portion and the separation portion, and an end surface of the raised portion close to the fixing portion is provided with a chamfer.

[0008] Preferably, the outer surface of the fixing portion is provided with threads.

[0009] Preferably, the boss and the separation portion are provided with a separation groove. The fixing portion is used for fixed connection with the machine tool, and the separation portion can be slightly deformed through the separation groove, and cooperates with the boss to expand the gear part from the inside of the gear part.

[0010] Preferably, a tapered surface is provided at one end of the through hole close to the boss.

[0011] Preferably, one end of the pull rod is provided with a cone head having the same angle as the cone surface on the through hole.

[0012] Preferably, the angle between the conical surface and the cone head relative to the axis is in the range of 5°-12°. Through the cooperation between the cone head and the conical surface, when the pull rod is pulled, the cone head can expand the boss and the separation portion, thereby clamping the part. When the pull rod is restored, the boss and the separation portion return to their original state, allowing the part to be loaded and unloaded.

[0013] Preferably, the fixing seat is connected to the pull rod via threads.

[0014] Preferably, the cross-section of the boss consists of two arcuate edges and two straight edges, wherein the two arcuate edges have the same center and radius and are arranged opposite each other, and the two straight edges respectively connect the two arcuate edges. The shape of the boss matches the inner hole of the gear part, and the straight edges can impart torque to the gear part, driving the gear part to rotate.

[0015] Beneficial effects:

[0016] 1. The utility model provides a special-shaped back-pull fixture for gear parts, which clamps the inside of one end of the gear part to facilitate positioning and alignment.

[0017] 2. In the prior art, clamping is performed through the outer wall of the gear. Although the tooth grooves and the gear teeth are matched, the gear teeth are susceptible to deformation caused by clamping. The main body of the present application includes a fixing portion, a raised portion, and a separation portion. The separation portion can be slightly deformed by the separation groove, and the mating boss tightens the gear part from the inside, eliminating the need for clamping from the outer wall of the gear part. The gear teeth are not subjected to stress and will not deform.

[0018] 3. In the utility model, a conical surface is provided at one end of the through hole close to the boss, and a conical head with the same angle as the conical surface on the through hole is provided at one end of the pull rod. Through the cooperation between the conical head and the conical surface, when the pull rod is pulled, the conical head can expand the boss and the separation part, thereby clamping the parts. When the pull rod is restored, the boss and the separation part return to their original state, and the parts can be loaded and unloaded.

[0019] 4. The shape of the boss in the present invention matches the inner hole of the gear part, and the straight edge can give the gear part torque to drive the gear part to rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 The present invention is a structural schematic diagram of an embodiment of a special-shaped back-pulling fixture for gear parts provided by the present invention.

[0022] Figure 2 The present invention is a cross-sectional view of an embodiment of a special-shaped back-pull fixture for gear parts provided by the present invention.

[0023] Figure 3 The present invention is a front view of an embodiment of a special-shaped back-pull fixture for gear parts provided by the present invention.

[0024] Figure 4 The present invention provides a schematic structural diagram of a gear part according to an embodiment of a special-shaped back-pulling fixture for a gear part.

[0025] In the figure, 1-main body, 11-fixing part, 12-raised part, 13-separating part, 14-chamfer, 15-thread, 16-separating groove, 17-conical surface, 2-fixing seat 41, 3-pull rod, 31-conical head, 4-boss, 41-arc edge, 42-straight edge, 5-gear part, 51-gear tooth, 52-positioning hole, 53-circular hole. DETAILED DESCRIPTION

[0026] The present invention can be more easily understood by referring to the following detailed description of the preferred embodiments of the present invention and the included Examples. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. In the event of any conflict, the definitions in this specification shall prevail.

[0027] Example 1:

[0028] The utility model provides a special-shaped back-pull fixture for a gear part, which is used to clamp the interior of one end of the gear part, thereby facilitating positioning and alignment.

[0029] In this embodiment, the gear parts to be processed are as follows: Figure 4 As shown, the outer side wall is provided with gear teeth 51, one end face of the gear is provided with a positioning hole 52, and the other end face is provided with a circular hole 53 to be processed.

[0030] Provides such Figure 1-3The illustrated embodiment of a special-shaped back-pulling fixture for gear parts comprises a main body 1, a fixed base 2, and a pull rod 3. The main body 1 has a through-hole, one end of the pull rod 3 is disposed within the through-hole, and the other end of the pull rod 3 is connected to the fixed base 2. A boss 4 is provided on the main body 1. The fixed base 2 and main body 1 are separately mounted on a machine tool. The main body 1 rotates with the machine tool's spindle, and the fixed base 2 is used to drive the pull rod 3 to move.

[0031] The main body 1 includes a fixed portion 11, a raised portion 12, and a separating portion 13. The two ends of the raised portion 12 are connected to the fixed portion 11 and the separating portion 13, respectively. The boss 4 is provided at one end of the separating portion 13. The diameter of the raised portion 12 is larger than the diameters of the fixed portion 11 and the separating portion 13. The end surface of the raised portion 12 near the fixed portion 11 is provided with a chamfer 14. The outer surface of the fixed portion 11 is provided with a thread 15. The boss 4 and the separating portion 13 are provided with a separation groove 16. The fixed portion 11 is used for fixed connection to the machine tool. The separating portion 13 can be slightly deformed by the separation groove 16, and the boss 4 cooperates with the gear part 5 to expand and tighten the gear part 5 from the inside.

[0032] A tapered surface 17 is provided at one end of the through-hole near the boss 4. A tapered head 31 is provided at one end of the pull rod 3, oriented at the same angle as the tapered surface 17 on the through-hole. The angle between the tapered surface 17 and the tapered head 31 relative to the axis is 8°. Through the cooperation between the tapered head 31 and the tapered surface 17, when the pull rod 3 is pulled, the tapered head 31 can expand the boss 4 and the separation portion 13, thereby clamping the parts. When the pull rod 3 is restored, the boss 4 and the separation portion 13 return to their original state, allowing for loading and unloading of the parts.

[0033] The fixing seat 2 and the pull rod 3 are connected via a thread 15 .

[0034] The cross-section of boss 4 consists of two arcuate edges 41 and two straight edges 42. The two arcuate edges 41 have the same center and radius and are positioned opposite each other. The two straight edges 42 connect the two arcuate edges 41. The shape of boss 4 matches the inner hole of gear part 5. The straight edges 42 can impart torque to gear part 5, driving it to rotate.

[0035] Working Principle: Positioning hole 52 of gear part 5 is fitted over boss 4. Moving retainer 2 drives pull rod 3, causing cone head 31 to move along tapered surface 17, expanding boss 4 and separation portion 13 along separation groove 16. This clamps gear part 5 from the inside, allowing the circular hole 53 to be machined. After turning, moving retainer 2 resets pull rod 3, returning cone head 31, boss 4, and separation portion 13 to their original positions, allowing the part to be removed.

Claims

1. A special-shaped back-pulling fixture for gear parts, characterized in that: include: A main body, a fixing seat and a pull rod, wherein a through hole is provided inside the main body, one end of the pull rod is provided in the through hole, and the other end of the pull rod is connected to the fixing seat, and a boss is provided on the main body; The main body includes a fixing portion, a raised portion and a separating portion, wherein both ends of the raised portion are connected to the fixing portion and the separating portion respectively, and the boss is provided at one end of the separating portion; The boss and the separation portion are provided with a separation groove.

2. A special-shaped back-pulling fixture for gear parts according to claim 1, characterized in that: The diameter of the raised portion is larger than the diameters of the fixing portion and the separation portion, and an end surface of the raised portion close to the fixing portion is provided with a chamfer.

3. A special-shaped back-pulling fixture for gear parts according to claim 2, characterized in that: The outer surface of the fixing portion is provided with threads.

4. The special-shaped back-pulling fixture for gear parts according to claim 1, characterized in that: A tapered surface is provided at one end of the through hole close to the boss.

5. The special-shaped back-pulling fixture for gear parts according to claim 4, characterized in that: One end of the pull rod is provided with a cone head with the same angle as the cone surface on the through hole.

6. The special-shaped back-pulling fixture for gear parts according to claim 5, characterized in that: The angle between the cone surface and the cone head relative to the axis is in the range of 5°-12°.

7. The special-shaped back-pulling fixture for gear parts according to claim 1, characterized in that: The fixing seat is connected to the pull rod through threads.

8. The special-shaped back-pulling fixture for gear parts according to claim 1, characterized in that: The cross section of the boss consists of two arc edges and two straight edges. The centers and radii of the two arc edges are the same and are arranged opposite to each other. The two straight edges respectively connect the two arc edges.

Images