CN215999529U

CN215999529U - Positioning fixture for machining shaft end cross hole of steering knuckle arm

Info

Publication number: CN215999529U
Application number: CN202121980549.3U
Authority: CN
Inventors: 钟晶晶; 王战兵; 李奎富; 邴涵; 张天鹏; 杜鑫; 艾然; 许新亮; 杨勇; 许恢兵
Original assignee: Hubei Tri Ring Forging Co Ltd
Current assignee: Hubei Tri Ring Forging Co Ltd
Priority date: 2021-08-20
Filing date: 2021-08-20
Publication date: 2022-03-11
Anticipated expiration: 2031-08-20

Abstract

The utility model relates to a positioning fixture for machining a shaft end cross hole of a knuckle arm, which is used for machining a semi-finished product of a U-shaped knuckle arm and comprises a base and a positioning and clamping assembly, wherein the base is provided with a positioning hole; the upper end of the base is provided with a straight mounting surface; the positioning and clamping assembly comprises a conical shaft positioning piece, a pressing piece and a bottom hole positioning piece, wherein the conical shaft positioning piece is sequentially arranged on a straight mounting surface from the front to the back, the conical shaft positioning piece comprises a V-shaped positioning piece, a V-shaped groove is formed in the V-shaped positioning piece, the bottom hole positioning piece comprises a positioning plate and a positioning mandrel, the positioning plate is vertically arranged on the straight mounting surface, the positioning mandrel is vertically arranged on the positioning plate, the whole positioning fixture is simple in structure, excessive positioning structures are not needed, a semi-finished product of a U-shaped knuckle arm after the positioning fixture is used for positioning is adopted, the processing of the shaft end surface and the stepped surface of the rear end of the conical shaft can be effectively carried out, the effect of multiple sets of fixture function combinations is realized, and the fixture design and manufacturing cost are greatly reduced.

Description

Positioning fixture for machining shaft end cross hole of steering knuckle arm

Technical Field

The utility model relates to the technical field of auxiliary structures for machining automobile parts, in particular to a positioning clamp for machining a shaft end cross hole of a steering knuckle arm.

Background

The knuckle arm is the last level of power transmission part of the automobile steering transmission device, has the function of connecting a drag link and a knuckle and has a steering function. When the automobile is turned, a driver applies a steering torque to a steering wheel, the torque passes through a steering shaft, a transmission shaft and a steering gear in sequence, is amplified by the steering gear, is transmitted into a steering rocker arm, is transmitted to a steering knuckle and a steering knuckle arm on the steering knuckle through a steering drag link, and is transmitted into a wheel hub finally to deflect wheels.

At present, a U-shaped knuckle arm exists in the market, which is of a U-shaped structure and is provided with two U-shaped support arms, wherein the end part of one support arm is provided with a shaft end thread, a first connecting hole is formed at a position of the shaft end thread close to the joint of the two support arms, a cone shaft for connecting with a knuckle is formed between the shaft end thread and the first connecting hole, the cone shaft and the knuckle are generally limited by a lock nut which is connected to the shaft end thread through a thread, in addition, in order to prevent the lock nut from falling off, a cross hole is drilled on the shaft end thread by part of manufacturers, a limiting pin fixing nut is penetrated in the cross hole, as the cross hole needs to be machined after the shaft end thread is turned, and the cross hole is formed by crossing two pin holes which are perpendicular to each other, therefore, in the prior art, a straight shaft cross hole drilling method is generally adopted, namely, the U-shaped knuckle arm is firstly fixed in one direction of a clamp, and then, drilling a first pin hole on the shaft end thread, then rotating the U-shaped knuckle arm on the clamp for 90 degrees, and then drilling a second pin hole, wherein the U-shaped knuckle arm needs to be clamped twice by adopting the processing mode.

SUMMERY OF THE UTILITY MODEL

Based on the above description, the utility model provides a positioning fixture for machining a shaft end cross hole of a knuckle arm, so as to solve the technical problems of high design cost and high manufacturing cost of the fixture in the process of machining the shaft end cross hole of the U-shaped knuckle arm in the prior art.

The technical scheme for solving the technical problems is as follows:

a positioning fixture for machining a cross hole at the shaft end of a knuckle arm is used for machining a semi-finished product of a U-shaped knuckle arm, the semi-finished product comprises a first support arm and a second support arm, the rear end of the first support arm is connected with the rear end of the second support arm, the front ends of the first support arm and the second support arm extend forwards, and the first support arm is sequentially provided with a machined shaft end thread, a conical shaft and a bottom hole from front to back; the positioning fixture is characterized by comprising a base and a positioning and clamping assembly;

the upper end of the base is provided with a straight mounting surface;

the positioning and clamping assembly comprises a taper shaft positioning piece, a pressing piece and a bottom hole positioning piece, wherein the taper shaft positioning piece, the pressing piece and the bottom hole positioning piece are sequentially arranged on the straight mounting surface from the front to the back, the taper shaft positioning piece comprises a V-shaped positioning piece, a V-shaped groove is formed in the V-shaped positioning piece, the pressing piece is used for pressing the first supporting arm onto the V-shaped groove, the bottom hole positioning piece comprises a positioning plate and a positioning mandrel, the positioning plate is vertically arranged on the straight mounting surface, and the positioning mandrel is vertically arranged on the positioning plate and is used for being matched with and positioned with the bottom hole.

Compared with the prior art, the technical scheme of the application has the following beneficial technical effects:

the utility model provides a positioning fixture, through V-arrangement locating piece and the conical shaft cooperation location on the first arm, through bottom hole and positioning core axle cooperation location, and then realize with semi-manufactured goods overall positioning on anchor clamps, wherein axle end screw thread and conical shaft are located the upper end of V-arrangement locating piece, the space of cross hole processing is left, secondly, axle end screw thread both sides do not have other parts to block, the work piece can be directly rotatory with the positioning fixture is whole random bed workstation, many times of clamping has been prevented, the positioning fixture overall structure of this application is simple, do not need too much location structure, adopt the semi-manufactured goods of the U-shaped knuckle arm after the positioning fixture location of this application, can also effectively carry out the processing of axle terminal surface and conical shaft rear end step face, realize the effect of many sets of anchor clamps function combination, anchor clamps design and manufacturing cost have significantly reduced.

On the basis of the technical scheme, the utility model can be further improved as follows.

Furthermore, the rear end of the base is provided with a position avoiding notch, so that the second support arm extends to one side of the base departing from the straight installation surface from the position avoiding notch.

Furthermore, the pressing piece comprises a first screw rod, a first pressing nut and a flat pressing plate, a strip-shaped hole is formed in the flat pressing plate, the flat pressing plate is movably sleeved on the upper end of the first screw rod through the strip-shaped hole, the first pressing nut is installed at the upper end of the first screw rod and located above the flat pressing plate, and the lower end face of the flat pressing plate is used for being abutted to the first supporting arm.

Furthermore, the pressing piece further comprises a second screw rod, the second screw rod is installed on one side of the first screw rod, and the upper end of the second screw rod and one side, far away from the first support arm, of the flat pressing plate are correspondingly arranged.

Furthermore, the positioning mandrel comprises a mandrel main body, a second compression nut and a positioning seat, the positioning seat is installed on one side of the positioning plate, one end of the mandrel main body is connected to the positioning seat, the second compression nut is installed at the other end of the mandrel main body, when the mandrel main body penetrates through the bottom hole, the second compression nut and the positioning seat are respectively located on two sides of the bottom hole, and one end face of the bottom hole is tightly attached to the end face of the positioning seat.

Furthermore, one side of the positioning seat is provided with a positioning lug, a positioning hole is formed in the positioning plate, and the positioning lug is embedded in the positioning hole in an interference fit manner.

Furthermore, cushion blocks are installed on two side walls of the V-shaped groove, and the upper end face of each cushion block is provided with an inclination angle in the front-back direction and is used for being matched with the inclination angle of the side face of the conical shaft.

Furthermore, the front side of the lower end of the base is connected with an auxiliary plate, the auxiliary plate is perpendicular to the straight mounting surface, and a reinforcing rib is connected between the auxiliary plate and the base.

Drawings

Fig. 1 is a schematic perspective view of a positioning fixture for machining a cross hole at a shaft end of a knuckle arm according to an embodiment of the present invention;

FIG. 2 is a schematic side view of the device of FIG. 1 in use;

FIG. 3 is a schematic view of the structure of FIG. 1 from another perspective;

fig. 4 is a schematic view of the positioning mandrel in fig. 1 in a disassembled state.

In the drawings, the components represented by the respective reference numerals are listed below:

1. a base; 2. positioning the clamping assembly; 20. semi-finished products; 11. a flat mounting surface; 12. an auxiliary plate; 13. reinforcing ribs; 201. a first support arm; 202. a second support arm; 203. shaft end threads; 204. a conical shaft; 205. a bottom hole; 21. a conical shaft positioning piece; 22. a compression member; 23. a bottom hole locating piece; 211. positioning blocks; 21a, a V-shaped groove; 212. cushion blocks; 221. a first screw; 222. a first compression nut; 223. flattening the plate; 224. a second screw; 231. positioning a plate; 232. positioning the mandrel; 2321. a mandrel body; 2322. a second compression nut; 2323. positioning seats; 2324. and positioning the projection.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It will be understood that spatial relationship terms, such as "under", "below", "beneath", "below", "over", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "under" can encompass both an orientation of above and below. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used herein interpreted accordingly.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. The "connection" in the following embodiments is understood as "electrical connection", "communication connection", or the like if the connected circuits, modules, units, or the like have electrical signals or data transmission therebetween.

As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

As shown in the figure, this application embodiment provides a positioning fixture is used in processing of axle head cross hole of knuckle arm for process the semi-manufactured goods 20 of U-shaped knuckle arm, semi-manufactured goods 20 includes first support arm 201 and second support arm 202, the rear end of first support arm 201 with the rear end of second support arm 202 is connected and the front end all extends forward, last preceding axle head screw thread 203, the taper shaft 204 and the bottom hole 205 that have processed that have set gradually after to of first support arm 201.

The positioning clamp comprises a base 1 and a positioning clamping component 2;

the upper end of the base 1 has a flat mounting surface 11, and the flat mounting surface 11 is a mounting plane of the positioning and clamping component 2 and is also a positioning reference plane of the positioning and clamping fixture.

The positioning and clamping assembly 2 comprises a conical shaft positioning piece 21, a pressing piece 22 and a bottom hole positioning piece 23 which are sequentially arranged on the straight mounting surface 11 from the front to the back, the conical shaft positioning piece 21 comprises a V-shaped positioning piece 211, a V-shaped groove 21a is formed in the V-shaped positioning piece 211, the pressing piece 22 is used for pressing the first support arm 201 on the V-shaped groove 21a, the bottom hole positioning piece 23 comprises a positioning plate 231 and a positioning mandrel 232, the positioning plate 231 is vertically arranged on the straight mounting surface 11, and the positioning mandrel 232 is vertically arranged on the positioning plate 231 and is used for being matched and positioned with the bottom hole 205.

In this embodiment, in order to prevent the second arm 202 from interfering with the processing of the first arm 201, the rear end of the base 1 has a position-avoiding notch, so that the second arm 202 extends from the position-avoiding notch to a side of the base 1 departing from the straight mounting surface 11, that is, the second arm 202 and the first arm 201 are distributed on two sides of the base by the arrangement of the position-avoiding notch, so as to ensure the separation of the two.

Preferably, the pressing member 22 includes a first screw 221, a first pressing nut 222 and a flat pressing plate 223, a strip-shaped hole is formed in the flat pressing plate 223, the flat pressing plate 223 is movably sleeved on the upper end of the first screw 221 through the strip-shaped hole, the first pressing nut 222 is installed on the upper end of the first screw 221 and is located above the flat pressing plate 223, and the lower end surface of the flat pressing plate 223 is used for abutting against the first support arm 201.

It should be noted that, in order to prevent the flat pressing plate 223 from directly pressing the conical shaft 204 and causing a crush injury to the conical shaft 204, the pressing member 22 is disposed at the rear side of the conical shaft in this embodiment.

In order to ensure that the flat pressing plate 223 horizontally presses the first support arm 201, the pressing member 22 further includes a second screw 224, the second screw 224 is installed on one side of the first screw 221, and an upper end of the second screw 224 is disposed corresponding to one side of the flat pressing plate 223 away from the first support arm 201.

The positioning mandrel 232 comprises a mandrel main body 2321, a second compression nut 2322 and a positioning seat 2323, the positioning seat 2323 is installed at one side of the positioning plate 231, one end of the mandrel main body 2321 is connected to the positioning seat 2323, and the second compression nut 2322 is installed at the other end of the mandrel main body 2321, through the above structural description, it can be known that the positioning mandrel 232 and the bottom hole 205 are mainly matched and positioned in such a way that the mandrel main body 2321 is penetrated and positioned in the bottom hole 205, and more preferably, when the mandrel main body 2321 is penetrated and positioned in the bottom hole 205, the second compression nut 2322 and the positioning seat 2323 are respectively located at two sides of the bottom hole 205, and an end face of one end of the bottom hole 205 is tightly attached to an end face of the positioning seat 2323.

Specifically, the step of installing the positioning seat 2323 on one side of the positioning plate 231 is that one side of the positioning seat 2323 is provided with a positioning protrusion 2324, the positioning plate 231 is formed with a positioning hole 231a, and the positioning protrusion 2324 is embedded in the positioning hole 231a in an interference fit manner.

In order to ensure the accurate positioning of the conical shaft, two side walls of the V-shaped groove 21a are provided with a spacer 212, and the upper end surface of the spacer 212 is formed with an inclination in the front-back direction for matching with the inclination of the side surface of the conical shaft 204.

In some preferred embodiments of the present application, an auxiliary plate 12 is connected to a front side of a lower end of the base 1, the auxiliary plate 12 is perpendicular to the flat mounting surface 11, and a reinforcing rib 13 is connected between the auxiliary plate 12 and the base 1.

The positioning fixture provided by the application is matched and positioned with the conical shaft 204 on the first support arm through the cushion block 212 in the V-shaped groove 21a, then matched and positioned with the mandrel main body 2321 through the bottom hole 205, and one end face of the bottom hole 205 is tightly attached to the end face of the positioning seat 2323, then the first support arm 201 is tightly pressed on the V-shaped positioning block 211 through the flat pressing plate 223, so that the semi-finished product 20 is integrally positioned on the fixture, wherein the shaft end thread 203 and the conical shaft 204 are positioned at the upper end of the V-shaped positioning block 211, a space for processing a cross hole is reserved, secondly, no other parts are blocked at two sides of the shaft end thread 203, a workpiece can directly rotate with the whole positioning fixture along with a machine tool worktable, multiple clamping is prevented, the whole structure of the positioning fixture is simple, excessive positioning structures are not needed, and a semi-finished product of a U-shaped steering knuckle arm is positioned by adopting the positioning fixture of the application, the processing of the shaft end face and the step face at the rear end of the conical shaft can be effectively carried out, the effect of combining multiple sets of fixtures is realized, and the fixture design and manufacturing cost is greatly reduced.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A positioning fixture for machining a cross hole at the shaft end of a knuckle arm is used for machining a semi-finished product of a U-shaped knuckle arm, the semi-finished product comprises a first support arm and a second support arm, the rear end of the first support arm is connected with the rear end of the second support arm, the front ends of the first support arm and the second support arm extend forwards, and the first support arm is sequentially provided with a machined shaft end thread, a conical shaft and a bottom hole from front to back; the positioning fixture is characterized by comprising a base and a positioning and clamping assembly;

the upper end of the base is provided with a straight mounting surface;

2. The positioning jig for machining the shaft-end cross hole of the knuckle arm as claimed in claim 1, wherein the rear end of the base has a clearance gap for the second support arm to extend from the clearance gap to a side of the base facing away from the flat mounting surface.

3. The positioning fixture for machining the shaft-end cross hole of the knuckle arm as claimed in claim 1, wherein the pressing member comprises a first screw, a first pressing nut and a flat pressing plate, a strip-shaped hole is formed in the flat pressing plate, the flat pressing plate is movably sleeved on the upper end of the first screw through the strip-shaped hole, the first pressing nut is mounted on the upper end of the first screw and located above the flat pressing plate, and the lower end face of the flat pressing plate is used for abutting against the first support arm.

4. The positioning jig for machining the shaft-end cross hole of the knuckle arm as defined in claim 3, wherein the pressing member further comprises a second screw rod, the second screw rod is mounted on one side of the first screw rod, and an upper end of the second screw rod is disposed to correspond to one side of the flat pressing plate, which is away from the first arm.

5. The positioning fixture for machining the axle end cross hole of the knuckle arm according to claim 1, wherein the positioning mandrel comprises a mandrel main body, a second compression nut and a positioning seat, the positioning seat is mounted on one side of the positioning plate, one end of the mandrel main body is connected to the positioning seat, the second compression nut is mounted on the other end of the mandrel main body, when the mandrel main body is inserted into the bottom hole, the second compression nut and the positioning seat are respectively located on two sides of the bottom hole, and one end face of the bottom hole is tightly attached to an end face of the positioning seat.

6. The positioning jig for machining a cross hole at an end of a shaft of a knuckle arm as claimed in claim 5, wherein a positioning boss is provided on one side of the positioning seat, and a positioning hole is formed in the positioning plate, and the positioning boss is fitted into the positioning hole in an interference fit manner.

7. The positioning jig for machining a cross hole at an end of a knuckle arm according to claim 1, wherein spacers are attached to both side walls of the V-shaped groove, and an upper end surface of each spacer is formed with an inclination in a front-rear direction so as to be adapted to an inclination of a side surface of the taper shaft.

8. The positioning jig for machining a cross hole in an axial end of a knuckle arm as defined in claim 1, wherein an auxiliary plate is attached to a front side of a lower end of the base, the auxiliary plate is disposed perpendicular to the flat mounting surface, and a reinforcing rib is attached between the auxiliary plate and the base.