A universal joint fork processing fixture

Abstract

4. The repairing kit for automotive dents, according to claim 1, wherein the two foot pieces are designed to be easily adjusted to fit the different types of foot-pieces, and the two foot pieces are easily adjusted to fit the different foot-pieces.

Description

Technical Field

[0001] The present invention relates to the technical field of universal joint fork processing, and specifically provides a universal joint fork processing fixture. Background Art

[0002] The universal joint fork is a key component in the automotive transmission system, mainly used to connect the drive shaft and transmit power, while allowing a certain angle of offset and axial sliding.

[0003] In the machining part of the universal joint fork processing technology, it mainly consists of turning - milling - drilling - grinding. First is the turning part. When turning, since it is mainly turning the shaft part of the universal joint fork, the fork part cannot be directly clamped by the chuck of the lathe. Therefore, an additional fixture is required for clamping, and then it is fixed to the lathe for turning. For clamping the fork part of the universal joint fork, there are two methods. The first is to directly clamp on the end face. This method is convenient for smaller universal joint forks, but it is not easy to clamp for slightly larger universal joint forks. Because the relative distance between the two ears of the larger universal joint is relatively far, it will make the clamping surface of the fixture very large. The other method is to clamp the two ears of the universal joint fork by the fixture. For clamping the two ears, the clamping parts need to apply force simultaneously after contacting, otherwise it will cause the unilateral force on the ear to be too large or too small, and then cause deformation. Therefore, the existing fixture requires at least two separate clamping operations, which is relatively inconvenient to operate, and it is even more inconvenient to adjust for different universal joint forks. For this reason, we propose a universal joint fork processing fixture. Summary of the Invention

[0004] The purpose of the present invention is to provide a universal joint fork processing fixture to solve the problems raised in the above background art.

[0005] To achieve the above object, the present invention provides the following technical solution: A universal joint fork processing fixture, including a main body portion, with ears fixed at both ends in the length direction of the main body portion. A guide rod is fixed between the two ears. Four clamping plates are slidably sleeved on the guide rod in sequence. Between the two ears, a first adjusting rod, a second adjusting rod, and a first adjusting rod are rotatably arranged in sequence. The second adjusting rod is threadedly connected to the two groups of clamping plates in the middle. The two first adjusting rods are respectively threadedly connected to the other two clamping plates. There is a spacing S between the adjacent ends of the first adjusting rod and the second adjusting rod, and an adjusting wheel that can slide axially is sleeved between them. The two end faces corresponding to the first adjusting rod, the second adjusting rod, and the adjusting wheel are provided with protrusions and / or grooves adapted to the protrusions. The protrusions are evenly distributed in a circumferential array around the axis of the first adjusting rod. The thickness of the protrusion along the axial direction of the first adjusting rod is L1, and the thickness of the two end faces of the adjusting wheel is L2. 2×L1 + L2 > S and L1 ≤ S - L2. A driving rod with an axis parallel to the first adjusting rod is also rotatably connected between the two ears. Two groups of transmission gears respectively meshing with the outer peripheral surface of the adjusting wheel are fixedly installed on the driving rod. A port for connecting a wrench is provided at any one end of the driving rod. In the middle of the side wall of the main body portion facing away from the ears, there is a connecting portion for connecting with the lathe chuck.

[0006] Preferably, a through groove is opened at the clamping end of the clamping plate, and a rotatable clamping block is rotatably connected to the clamping plate through the through groove.

[0007] Preferably, a counterweight is also provided on the main body portion, so that the center of mass of the whole is located on the axis of the lathe rotating shaft after the connecting portion is fixed by the lathe chuck.

[0008] Preferably, the adjusting wheel is always subjected to a force that fits against the end of the second adjusting rod in the static state, and this fitting force enables the adjusting wheel to always rotate synchronously with the second adjusting rod when the transmission gear is driven and before the clamping plate touches the workpiece and is stressed.

[0009] Preferably, the two end faces of the adjusting wheel can relatively rotate elastically, and the rotation angle range is α, and α is greater than or equal to the angle between adjacent protrusions on the same end face and less than twice the angle between adjacent protrusions on the same end face.

[0010] Preferably, the two end faces of the adjusting wheel can relatively rotate elastically, and the rotation angle range is α, and α is greater than or equal to the angle between adjacent protrusions on the same end face and less than twice the angle between adjacent protrusions on the same end face. And the initial force of the elastic rotation between the adjusting wheel and its fixed shaft is greater than the sum of the fitting force of the adjusting wheel against the second adjusting rod and the static friction force when the clamping plate is in the unclamped state and moves.

[0011] Preferably, the protrusion is a hemispherical body.

[0012] Preferably, the protrusion is a columnar body extending radially along the end face of the adjusting wheel.

[0013] Preferably, the protrusion is in the shape of a wedge.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] By providing four clamping plates, the present invention can select the clamping method according to the needs of the workpiece. It can clamp either the end face of the universal joint fork or the ear of the universal joint fork, and the flexible selection improves the applicability.

[0016] By providing a transmission method between the adjusting wheel and the two adjusting rods through protrusions and grooves, the present invention can achieve that the clamping plates first contact the workpiece and then lock synchronously, which can avoid deformation of the workpiece ear caused by unilateral force application.

[0017] The clamping of the present invention only requires rotating the driving rod, which is simple and convenient to operate and does not require multiple clampings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the overall structure of the universal joint fork workpiece;

[0019] Figure 2 Schematic diagram of the overall structure of the present invention;

[0020] Figure 3 Schematic diagram of the structure of the connecting part;

[0021] Figure 4 Schematic diagram of the unfolded overall structure;

[0022] Figure 5 Axial sectional structure schematic diagram of the connection state at both ends of the adjusting wheel;

[0023] Figure 6 Schematic diagram of the protrusion being a spherical body;

[0024] Figure 7 Schematic diagram of the protrusion being a columnar body;

[0025] Figure 8 Schematic diagram of the protrusion being a wedge;

[0026] Figure 9 Cross-sectional schematic diagram of the relative rotation of the two end faces of the adjusting wheel.

[0027] In the figure: 1 - main body part; 2 - ear; 3 - guide slide bar; 4 - clamping plate; 5 - first adjusting rod; 6 - second adjusting rod; 7 - adjusting wheel; 8 - protrusion; 9 - groove; 10 - driving rod; 11 - transmission gear; 12 - port; 13 - connecting part; 41 - through groove; 42 - clamping block. DETAILED DESCRIPTION OF THE INVENTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 The present invention provides a technical solution: a universal joint fork processing fixture, including a main body part 1. The main body part 1 is in the shape of a long plate. At both ends on the same side of the main body part 1, ear parts 2 are fixedly connected. The middle area of the main body part 1 is annular. On the other side relative to the ear parts 2, a connecting part 13 is fixedly arranged. Both ends of the guide slide rod 3 are fixedly connected to the two ear parts 2 respectively, and are fixed to the outer ends of the ear parts 2, that is, the ends away from the main body part 1, forming a whole into a looped frame. The cross-section of the guide slide rod 3 is in the shape of an I-beam, which can better resist deformation;

[0030] Four clamping plates 4 are provided, and all are slidably sleeved on the guide slide rod 3. Two adjacent clamping plates 4 can be used as clamping parts for clamping. On the two ear parts 2, two first adjusting rods 5 with a common axis are rotatably connected, and a second adjusting rod 6 with the same axis is arranged in the middle of the adjacent ends of the two first adjusting rods 5. The second adjusting rod 6 is rotatably installed on the main body part 1 through a bearing seat or a similar structure. Installation grooves are opened at the opposite ends of the first adjusting rod 5 and at both ends of the second adjusting rod 6. Adjusting wheels 7 are rotatably installed through the installation grooves. And the clamping plates 4 are threadedly connected to the first adjusting rod 5 and the second adjusting rod 6. When the first adjusting rod 5 and the second adjusting rod 6 rotate in the same direction, at the Figure 4 shown angle, from left to right, the first and the fourth move towards or away from each other, and the second and the third move away from or towards each other synchronously;

[0031] A driving rod 10 is also rotatably installed between the two ear parts 2. The axis of the driving rod 10 is parallel to the axis of the first adjusting rod 5, and the installation position of the driving rod 10 is on the side of the width direction of the ear part 2, so as to reduce the distance from the working end of the clamping plate 4 to the connecting part 13. Two transmission gears 11 are fixedly installed on the driving rod 10. Gear teeth are provided on the outer circumferential surface of the adjusting wheel 7 and are meshed with the transmission gears 11. A port 12 is provided at any one end of the driving rod 10. One embodiment of the port 12 is a multi-regular hexagon block, and it is a block body with a regular hexagon groove opened at one end. This way of setting is convenient for rotating the driving rod 10 by a wrench;

[0032] There is a gap between the end faces of the opposite ends of the first adjusting rod 5 and the second adjusting rod 6, and the distance is S. The thickness of the adjusting wheel 7 is L2 (excluding the thickness of rotation). Protrusions 8 are provided on any one or both of the two end faces of the adjusting wheel 7 close to the first adjusting rod 5, and correspondingly, grooves 9 are opened on the other corresponding face to match the protrusions 8. That is, it includes the following situations. First, the protrusions 8 are provided on the end face of the adjusting wheel 7, and the grooves 9 are opened on the end face of the first adjusting rod 5. Second, the grooves 9 are provided on the end face of the adjusting wheel 7, and the protrusions 8 are provided on the end face of the first adjusting rod 5. Third, the protrusions 8 and the grooves 9 are provided on both faces. Similarly, the opposite end faces of the adjusting wheel 7 and the second adjusting rod 6 are the same as the above method. In the above three situations, the first one is selected for specific description, so the other two situations will not be elaborated. The protrusions 8 are annularly arranged on the end face of the adjusting wheel 7 with the axis of the adjusting wheel 7 as the center line. It can be single-row or multi-row, that is, arranged at different diameters. The maximum height, that is, the thickness, of the protrusions 8 exceeding the end face of the adjusting wheel 7 is L1;

[0033] 2×L1 + L2 > S and L1 ≤ S - L2. The relationship between the three dimensions is determined by these two inequalities. That is, when the adjusting wheel 7 rotates, three situations will occur. One is to drive the first adjusting rod 5 alone. The second is to drive the second adjusting rod 6 alone. The third is to drive the first adjusting rod 5 and the second adjusting rod 6 at the same time. In the first situation, only the first adjusting rod 5 changes the positions of the clamping plates 4 at both ends. In the second situation, it drives the two clamping plates 4 in the middle. In the third situation, it locks simultaneously. Specifically, when the adjusting wheel 7 starts to rotate, that is, in the initial state, the clamping plates 4 are in the open state, and the transmission between the components is only friction without other external forces. Therefore, when the adjusting wheel 7 rotates, there will be no large resistance to the rotation of the first adjusting rod 5 and the second adjusting rod 6 at both end faces. Therefore, the transmission is carried out through the friction between the faces of the protrusions 8 and the grooves 9. Because the adjusting wheel 7 can move axially, it is possible to drive the first adjusting rod 5 first, or it is possible to drive the second adjusting rod 6 first, or it is also possible to drive them synchronously. The four clamping plates 4 are divided into three groups. That is, Figure 4 in the shown situation from left to right, the first and the second are group A, the second and the third are group C, and the third and the fourth are group B. Group A and group B are the situations of clamping the two ends of the universal joint fork, while group C is used to clamp the end face of the universal joint fork ( Figure 1 in the front-back direction in

[0034] In the case where Group A and Group B act, since the adjusting wheel 7 will be centered under the action of the inclined surface reaction forces generated by the grooves 9 or bumps on both sides during rotation, all four clamping plates 4 will move simultaneously. In the synchronous case, the two clamping plates 4 at both ends or the two clamping plates 4 in the middle will first contact the workpiece and be subject to resistance, that is, the outer ends clamp or the inner ends support the two fork parts. Continuing to rotate in this state causes the protrusion 8 at one end of the adjusting wheel 7 to disengage from the corresponding groove 9 (depending on whether it clamps or supports the fork part), and then only drives the adjusting rod corresponding to the other end until the clamping plate 4 corresponding to the other end also contacts the fork part of the workpiece. At this time, a balanced state is formed on both sides again. Therefore, when continuing to rotate the adjusting wheel 7, a force will be applied to both sides, achieving the effect of further locking after clamping;

[0035] In the case of Group C, it is even simpler, that is, reverse-rotate the driving rod 10 to make the two clamping plates 4 of Group C move towards each other to clamp the two end faces of the workpiece;

[0036] The setting of the connecting part 13 mainly depends on the form of the chuck of the lathe used, and its form is not limited here. As one specific implementation method, a cylinder is adopted, and three planes are opened on the outer peripheral surface of the cylinder for being clamped by a conventional triangular chuck.

[0037] Refer to Figure 6 、 Figure 7 and Figure 8 As one embodiment of the protrusion 8, the protrusion 8 adopts a hemispherical structure, a columnar body radially extending from the end face of the adjusting wheel 7, or a wedge shape. Further, the wedge shape can be divided into symmetric and asymmetric ones. The asymmetric one, such as Figure 8 then two opposite types need to be set to maintain the friction balance during middle turning. Similarly, preferably, the protrusions 8 and / or grooves 9 on the two end faces of the adjusting wheel 7 need to have corresponding numbers to maintain balance.

[0038] Refer to Figure 4 In the case where the clamping block 42 is not provided, the working surface of the clamping plate 4 is fixed and can only clamp flat-shaped ones. For the two end faces of the fork part with an inclined angle, there is only line contact between the clamping plate 4 and the workpiece, and the clamping is unstable. By setting the clamping block 42, a through groove 41 is opened on the clamping plate 4, and the clamping block 42 is rotationally connected by a shaft, so that it can be adaptively adjusted according to the inclination of the workpiece surface. The active included angle between the normal directions of the two planes ( Figure 4 the left and right faces shown) of the clamping block 42 and the normal direction of the surface of the clamping end of the clamping plate 4 is preferably set within ±10°. Because too large an angle will also cause stability problems and at the same time affect the initial contact state with the workpiece, resulting in inconvenient use.

[0039] Refer to Figure 2, since there is only one driving rod 10 and it is not on the symmetry plane, the overall state is unbalanced. When the main body 1 is installed on the lathe through the connecting portion 13, it needs to rotate. Therefore, in order to maintain the balance of rotation, a counterweight is set for balance.

[0040] During the above driving process, the adjusting wheel 7 centers and drives simultaneously by relying on the reaction force, which will lead to uncertainty, that is, it is uncertain which clamping plate 4 contacts the workpiece first. Additionally, in the case of only using group C, the adjusting wheel 7 centered will also drive the clamping plates 4 at both ends. If the adjusting wheel 7 is initially forced to fit the second adjusting rod 6, the external force that the user needs to apply can be further reduced. Similarly, in the case of using group A and group B, the fitting can be adjusted by half each time, which is more labor-saving, and only a large force is required when locking.

[0041] A spring can be used for the adjusting wheel 7 to fit the end of the second adjusting rod 6. For example, springs are arranged at the ends of both the adjusting wheel 7 and the first adjusting rod 5 to generate pressure, so that the other end face of the adjusting wheel 7 fits the end of the second adjusting rod 6. A magnet can also be used to achieve this by using repulsive force.

[0042] When the first adjusting rod 5 and the second adjusting rod 6 make the clamping plate 4 contact the surface of the workpiece, a special situation may occur at this time, that is, due to the imbalance of friction, the first adjusting rod 5 and the second adjusting rod 6 are not synchronized, and one of the adjusting rods may be in an idle state. After the other adjusting rod makes the clamping plate 4 reach the position, the adjusting wheel 7 should move closer to the end of the idle adjusting rod at this time. If it happens that the protrusion 8 at the end of the idle adjusting rod and the end face of the adjusting wheel 7 are not located in the groove 9, it will result in one being locked while the other has not reached the clamping position. Moreover, if the included angle between two adjacent protrusions 8 is too large (the included angle between the connecting lines with the axis), it will cause the adjusting wheel 7 to be difficult to rotate and get stuck. To avoid this situation, the two end faces of the adjusting wheel 7 can rotate relative to each other at a small angle, so that the protrusion 8 of the stuck adjusting wheel 7 can enter the groove 9 for side-changing adjustment. Therefore, the smaller the included angle between two adjacent protrusions 8, the better, but it cannot be too close, and the strength problem between two adjacent grooves 9 needs to be considered.

[0043] In the state where the adjusting wheel 7 fits the second adjusting rod 6, the two clamping plates 4 in the middle will always be driven preferentially. Therefore, as Figure 9In this state, the end face on the left is arranged opposite to the end face of the second adjusting rod 6, and the end face on the right is opposite to the end face of the first adjusting rod 5. That is, when the adjusting wheel 7 rotates, it first drives the second adjusting rod 6 to drive the two middle clamping plates 4. After the two middle clamping plates 4 contact the workpiece, if the above-mentioned jamming situation occurs, the two end faces can rotate relative to each other, so that the protrusion 8 on the right can enter the groove 9 of the first adjusting rod 5, and then it can continue to rotate. At the same time, the left side withdraws from the second adjusting rod 6. The elastic rotation between the two end faces of the adjusting wheel 7 is convenient for resetting. The initial force of the elastic rotation between the adjusting wheel 7 and its fixed shaft is greater than the sum of the acting force of the adjusting wheel 7 pressing against the second adjusting rod 6 and the static friction force when the clamping plate 4 moves in the unclamped state. That is, the relative rotation of the two ends of the adjusting wheel 7 needs to act in the case of jamming. Therefore, it is necessary to overcome the acting force in the normal situation to maintain a relatively synchronous state.

[0044] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0045] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A universal joint fork processing fixture, characterized in that The invention comprises a main body (1), ears (2) are fixed at both ends of the main body (1) in the length direction, a guide slide rod (3) is fixed between the two ears (2), four clamping plates (4) are arranged on the guide slide rod (3) in sequence and slidingly, a first adjustment rod (5), a second adjustment rod (6) and a first adjustment rod (5) are arranged between the two ears (2) and are arranged to rotate in sequence, the second adjustment rod (6) is threadedly connected to two groups of clamping plates (4) located in the middle, two first adjustment rods (5) are respectively threadedly connected to the other two clamping plates (4), a spacing S is provided between the adjacent ends of the first adjustment rod (5) and the second adjustment rod (6), and a movable sleeve is arranged between the two. The adjusting wheel (7) is axially slidable, the first adjusting rod (5), the second adjusting rod (6) and the two corresponding end surfaces of the adjusting wheel (7) are provided with protrusions (8) and / or grooves (9) adapted to the protrusions (8), the protrusions (8) are uniformly arranged in a circular array around the axis of the first adjusting rod (5), the protrusions (8) have a thickness L1 along the axial direction of the first adjusting rod (5), the thickness of the two end surfaces of the adjusting wheel (7) is L2, 2*L1+L2>S and L1≤S-L2, a driving rod (10) whose axis is parallel to the first adjusting rod (5) is rotatably connected between the two ears (2), and two sets of A transmission gear (11) is respectively meshed with the outer peripheral surface of the adjustment wheel (7), and a port (12) for connecting a wrench is provided at any end of the driving rod (10). A connecting portion (13) for connecting with a lathe claw is provided in the middle of a side wall of the main body (1) opposite to the ear portion (2). The adjustment wheel (7) is always subjected to a force that fits the end of the second adjustment rod (6) in a stationary state, and the force of the fit makes the adjustment wheel (7) always rotate synchronously with the second adjustment rod (6) when the transmission gear (11) is driven and before the clamping plate (4) is in a force-bearing state without contacting the workpiece. The two end surfaces of the adjustment wheel (7) can rotate elastically relative to each other, and the rotation The movable angle range is α, and α is greater than or equal to the included angle between adjacent protrusions (8) on the same end surface, and is less than twice the included angle between adjacent protrusions (8) on the same end surface. The two end surfaces of the adjusting wheel (7) can elastically rotate relative to each other, and the rotation angle range is α, and α is greater than or equal to the included angle between adjacent protrusions (8) on the same end surface, and is less than twice the included angle between adjacent protrusions (8) on the same end surface. The initial force of the elastic rotation between the adjusting wheel (7) and its fixed axis is greater than the sum of the force of the adjusting wheel (7) fitting against the second adjusting rod (6) and the static friction force of the clamping plate (4) when it moves in an unclamped state.

2. The universal joint fork processing fixture according to claim 1, wherein: A through slot (41) is provided at the clamping end of the clamping plate (4), and the clamping plate (4) is rotatably connected to a rotatable clamping block (42) via the through slot (41).

3. A universal joint fork machining fixture according to claim 1 or 2, characterized in that: The main body (1) is also provided with a counterweight, and the center of mass of the whole is located on the axis line of the lathe rotating shaft after the connecting part (13) is fixed by the lathe claws through the counterweight.

4. A universal joint fork processing fixture according to claim 1, characterized in that: The protrusion (8) is a hemispherical body.

5. The universal joint fork processing fixture according to claim 1, characterized in that: The protrusion (8) is a columnar body extending radially along the end surface of the adjusting wheel (7).

6. The universal joint fork processing fixture according to claim 1, wherein: The protrusion (8) is in the shape of a wedge.

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