Special clamp for pressing steel sleeve of steering knuckle

Abstract

A special clamp for press fitting of a steering knuckle steel sleeve comprises a press positioning pressure head and a clamp tool mounting frame, the press positioning pressure head is arranged above the clamp tool mounting frame, a workpiece positioning mechanism is arranged at the top of the clamp tool mounting frame and comprises a supporting core sleeve and a movable positioning core shaft, and the supporting core sleeve is sleeved with the movable positioning core shaft. The supporting core sleeve is arranged in the middle of the clamp tool installation frame, a core shaft moving cavity and a positioning shaft cavity are formed in the supporting core sleeve, the movable positioning core shaft is installed in the core shaft moving cavity in a telescopic mode, a spring structure is further arranged in the core shaft moving cavity, and the two ends of the spring structure are connected with the supporting core sleeve and the movable positioning core shaft respectively. A positioning shaft is connected to the bottom of the movable positioning mandrel and arranged in the positioning shaft cavity. The device can be specifically suitable for pressing the steel bushing in the top hole of the steering knuckle, can effectively ensure the accuracy of pressing the steel bushing, improves the working efficiency of pressing the steel bushing, and is favorable for controlling the cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of special clamps, and in particular relates to a special clamp for press-fitting a steel sleeve of a steering knuckle. Background Art

[0002] Since the hardness of the main material of the top hole of the aluminum steering knuckle is not enough, a steel sleeve with higher hardness needs to be pressed into the top hole of the aluminum steering knuckle by a press in an interference fit manner. The conventional press-fit steel sleeve scheme is to place the steel sleeve on the inner hole of the top hole of the aluminum steering knuckle, and then use the servo press head to act on the upper end face of the steel sleeve to force the steel sleeve into the top hole of the aluminum steering knuckle. However, since the steel sleeve and the top hole of the aluminum steering knuckle need to achieve an interference fit, the outer diameter of the steel sleeve is larger than the inner diameter of the top hole of the aluminum steering knuckle. During the process of press-fitting the steel sleeve by the servo press, the steel sleeve is extremely prone to skew. If the steel sleeve is skewed, the pressure will be too high during the initial press-in, and the servo press will alarm. It is necessary to continuously adjust in time to achieve the effect of accurate pressing, but this is inefficient; if the steel sleeve is skewed and the servo press does not alarm in time, it is easy to cause the bottom hole of the aluminum steering knuckle to be crushed, causing the aluminum steering knuckle to be scrapped, increasing the damage rate in the manufacturing process, which is not conducive to saving manufacturing costs.

[0003] There is an urgent need for a special clamp to ensure the accuracy of steel sleeve press-fitting. In the prior art, a patent document with announcement number CN213380324U discloses a steering knuckle mechanical clamp with a manual elastic preload, which includes: a clamp body, a positioning mechanism installed on the clamp body and used for positioning the steering knuckle, and a clamping mechanism installed on the clamp body and used for clamping the steering knuckle. The clamp body is also provided with a manual elastic preload for pre-clamping the steering knuckle. The manual elastic preload includes a fixed sleeve installed on the clamp body and located on one side of the steering knuckle, a push rod movably installed in the fixed sleeve, a push pin arranged at the front end of the push rod and used for elastically pressing against the steering knuckle, and a spring arranged in the push rod and used for pushing the push pin to elastically press against the steering knuckle. The above technical solution ensures that the steering knuckle is positioned in place and does not fall before clamping, and the steering knuckle is still accurately positioned after clamping. However, if it is used in the steel sleeve press-fitting process, it cannot guarantee that the steering knuckle is still accurately positioned during the dynamic force process of the steel sleeve press-fitting, and it cannot be specifically applied to press-fitting the steel sleeve in the top hole of the steering knuckle. Utility Model Content

[0004] 1. Technical Problems Solved

[0005] The utility model aims at the deficiencies in the prior art and proposes a special fixture for pressing steel sleeves in steering knuckles, which has a simple structure, is easy to use, can be specifically applied to press-fitting steel sleeves in the top holes of steering knuckles, can effectively ensure the accuracy of press-fitting steel sleeves, improves the efficiency of press-fitting steel sleeves, and is conducive to controlling costs.

[0006] 2. Specific technical solutions

[0007] A special fixture for pressing a steel sleeve for a steering knuckle comprises a press positioning pressure head and a fixture tool installation frame, the press positioning pressure head is arranged above the fixture tool installation frame, and a workpiece positioning mechanism is arranged on the top of the fixture tool installation frame, and the workpiece positioning mechanism comprises a supporting core sleeve and a movable positioning core shaft, the supporting core sleeve is arranged in the middle of the fixture tool installation frame, the supporting core sleeve has a core shaft movable cavity and a positioning shaft cavity inside, the core shaft movable cavity is connected with the positioning shaft cavity and passes through the center of the supporting core sleeve, and the core shaft movable cavity is located on the upper side of the positioning shaft cavity, the movable positioning core shaft is telescopically installed in the core shaft movable cavity, and a spring structure is also arranged in the core shaft movable cavity, the two ends of the spring structure are respectively connected with the inner wall of the supporting core sleeve and the bottom of the movable positioning core shaft, a positioning shaft is connected to the bottom of the movable positioning core shaft, and the positioning shaft is arranged in the positioning shaft cavity, the movable positioning core shaft is aligned with the center of the press positioning pressure head, and the concentricity of the movable positioning core shaft and the press positioning pressure head is less than 0.1mm.

[0008] Preferably, a threaded rod is provided at the top of the positioning shaft, a threaded hole is provided at the center of the bottom of the movable positioning mandrel, and the threaded rod is connected in cooperation with the threaded hole.

[0009] Preferably, an elastic steel ball structure is arranged around the circumferential surface of the bottom of the press positioning head.

[0010] Preferably: the fixture tooling installation frame includes a mounting base plate, a concave tooling table plate and two support guard plates, the two support guard plates are vertically arranged on both sides of the mounting base plate, the concave tooling table plate is horizontally arranged on the top of the two support guard plates, and a mounting hole is opened in the middle of the concave tooling table plate, the mounting hole is arranged close to the recessed side of the concave tooling table plate, and the bottom of the support core sleeve is installed in the mounting hole.

[0011] Preferably, a neutral plate is provided between the middle of the concave tooling table and the middle of the installation base plate, and an auxiliary support mechanism is installed in the middle of the neutral plate.

[0012] Preferably: the auxiliary support mechanism is provided with a support shaft, a limit plate is provided at one end of the support shaft, a threaded rod is provided at the other end of the support shaft, a nut structure is sleeved on the threaded rod, a circular hole structure is provided in the middle of the neutral plate, the middle of the support shaft passes through the circular hole structure, the nut structure and the limit plate are respectively located on both sides of the circular hole structure, the limit plate is arranged close to the recess side of the concave workbench, and a compression spring is also sleeved on the support shaft, and the compression spring is arranged between the limit plate and the neutral plate.

[0013] The beneficial effects of the utility model are as follows: a workpiece positioning mechanism is provided, which is aligned with the center of the positioning pressure head of the press through a movable positioning core shaft, and a positioning shaft is provided to ensure coaxiality, which can effectively ensure the accuracy of the steel sleeve press-fitting, avoid the steel sleeve from being skewed during the press-fitting process, reduce the failure rate and loss cost of the steel sleeve press-fitting, improve the efficiency of the steel sleeve press-fitting work, and help control costs; and a fixture tooling installation frame is provided, which can be specifically used for press-fitting the steel sleeve in the top hole of the steering knuckle, and is convenient for placing the steering knuckle; an auxiliary supporting mechanism is provided, and its limit plate can play an elastic supporting role on the side of the steering knuckle, so as to avoid the coaxiality being affected by the lateral force when the center of gravity of the steering knuckle is not at the top hole position of the steering knuckle, and even the hole mouth is damaged when the steering knuckle top hole sleeve is directly installed on the movable positioning core shaft, and the supporting length of the limit plate can be adjusted by the nut structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the front side of the utility model after the steering knuckle is installed.

[0015] Figure 2 It is a schematic diagram of the three-dimensional structure of the utility model after the steering knuckle is installed.

[0016] Figure 3 It is a three-dimensional structural schematic diagram of the fixture installation frame of the utility model.

[0017] Figure 4 It is a schematic diagram of the cross-sectional structure of the overall front side of the utility model.

[0018] Figure 5 It is a schematic diagram of the cross-sectional structure of the overall side of the utility model.

[0019] In the figure: press positioning head 1; fixture installation frame 2; workpiece positioning mechanism 3; neutral plate 4; auxiliary support mechanism 5;

[0020] Installation base plate 21; concave tooling plate 22; support guard plate 23;

[0021] Support core sleeve 31; movable positioning core shaft 32; spring structure 33; positioning shaft 34;

[0022] Support shaft 51; limiting plate 52; nut structure 53; compression spring 54. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0024] In the description of the present invention, it should be noted that the terms "surface", "edge", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, a direct connection, or a connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Example:

[0027] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown: a special fixture for pressing a steel sleeve for a steering knuckle is provided with a press positioning ram 1 and a fixture tooling installation frame 2, the press positioning ram 1 is arranged above the fixture tooling installation frame 2, the fixture tooling installation frame 2 has a mounting base plate 21, a concave tooling table 22 and two supporting guard plates 23, the two supporting guard plates 23 are respectively vertically arranged on both sides of the mounting base plate 21, the concave tooling table 22 is horizontally arranged on the top of the two supporting guard plates 23, and the concave side of the concave tooling table 22 is used for placing the steering knuckle.

[0028] A workpiece positioning mechanism 3 is provided on the top of the fixture tooling installation frame 2, and the workpiece positioning mechanism 3 includes a supporting core sleeve 31 and a movable positioning core shaft 32. The supporting core sleeve 31 is arranged in the middle of the top of the fixture tooling installation frame 2, that is, a mounting hole is opened in the middle of the concave tooling table 22, and the mounting hole is arranged close to the notch side of the concave tooling table 22. The bottom of the supporting core sleeve 31 is installed in the mounting hole, and can be installed by direct interference fit or by threaded connection.

[0029] The support core sleeve 31 has a core shaft movable cavity and a positioning shaft cavity inside. The core shaft movable cavity is connected with the positioning shaft cavity and passes through the center of the support core sleeve 31, and the core shaft movable cavity is located on the upper side of the positioning shaft cavity. The movable positioning core shaft 32 is telescopically installed in the core shaft movable cavity. A spring structure 33 is also arranged in the core shaft movable cavity. The two ends of the spring structure 33 are respectively connected to the inner wall of the support core sleeve 31 and the bottom of the movable positioning core shaft 32. A positioning shaft 34 is connected to the bottom of the movable positioning core shaft 32, and the positioning shaft 34 is arranged in the positioning shaft cavity. The movable positioning core shaft 32 is aligned with the center of the press positioning ram 1, and the concentricity of the movable positioning core shaft 32 and the press positioning ram 1 is less than 0.1mm, and the parallelism between the upper end surface of the support core sleeve 31, the upper surface of the concave tooling table 22 and the lower surface of the installation base plate 21 is also less than 0.1mm, which can effectively ensure the accuracy of the steel sleeve pressing, avoid the steel sleeve from being skewed during the pressing process, reduce the failure rate and loss cost of the steel sleeve pressing, improve the efficiency of the steel sleeve pressing, and help control costs.

[0030] A threaded rod is provided at the top of the positioning shaft 34, and a threaded hole is opened in the center of the bottom of the movable positioning core shaft 32. The threaded rod is connected with the threaded hole. The positioning shaft 34 can ensure the concentricity of the movable positioning core shaft 32, and the threaded connection method can facilitate the adjustment of the extension height of the movable positioning core shaft 32 through the positioning shaft 34. A disk cap is provided at the bottom of the positioning shaft 34, which is convenient for control and adjustment, and can limit the extension height of the movable positioning core shaft 32. Of course, it can also be limited by fixed connection through the spring structure 33.

[0031] An elastic steel ball structure is arranged around the circumferential surface of the bottom of the press positioning ram 1, which is beneficial to improving the concentricity of the steel sleeve and the press positioning ram 1, making the press-fitting positioning more accurate.

[0032] A neutral plate 4 is arranged between the middle of the concave tooling table 22 and the middle of the installation base plate 21, an auxiliary support mechanism 5 is installed in the middle of the neutral plate 4, the auxiliary support mechanism 5 is provided with a support shaft 51, a limit plate 52 is arranged at one end of the support shaft 51, a threaded rod is arranged at the other end of the support shaft 51, a nut structure 53 is sleeved on the threaded rod, a circular hole structure is arranged in the middle of the neutral plate 4, the middle of the support shaft 51 passes through the circular hole structure, the nut structure 53 and the limit plate 52 are respectively located on both sides of the circular hole structure, and the limit plate 51 is provided at the other end of the support shaft 51. 2 is arranged near the concave side of the concave tooling table 22, and a compression spring 54 is sleeved on the support shaft 51, and the compression spring 54 is arranged between the limit plate 52 and the neutral plate 4. The limit plate 52 is used to play an elastic supporting role on the side of the steering knuckle to avoid that when the center of gravity of the steering knuckle is not at the top hole of the steering knuckle, the top hole of the steering knuckle is directly sleeved on the movable positioning core shaft 32, and the coaxiality is affected by the lateral force, and even the hole is damaged. The supporting length of the limit plate 52 can be adjusted by the nut structure 53.

[0033] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention shall be defined by the appended claims.

Claims

1. A special fixture for pressing a steel sleeve on a steering knuckle, characterized in that: The invention comprises a press positioning head (1) and a fixture installation frame (2), wherein the press positioning head (1) is arranged above the fixture installation frame (2), a workpiece positioning mechanism (3) is arranged on the top of the fixture installation frame (2), the workpiece positioning mechanism (3) comprises a support core sleeve (31) and a movable positioning core shaft (32), the support core sleeve (31) is arranged in the middle of the fixture installation frame (2), the support core sleeve (31) has a core shaft movable cavity and a positioning shaft cavity inside, the core shaft movable cavity is connected with the positioning shaft cavity and passes through the center of the support core sleeve (31), and the core shaft movable cavity is arranged in the middle of the fixture installation frame (2), and the core shaft movable cavity is arranged in the middle of the fixture installation frame (2), and the core shaft movable cavity is arranged in the middle of the fixture installation frame (2), and the core shaft movable cavity is arranged in the middle of the fixture installation frame (31). The movable cavity is located on the upper side of the positioning shaft cavity. The movable positioning core shaft (32) is telescopically installed in the core shaft movable cavity. A spring structure (33) is also arranged in the core shaft movable cavity. The two ends of the spring structure (33) are respectively connected to the support core sleeve (31) and the movable positioning core shaft (32). A positioning shaft (34) is connected to the bottom of the movable positioning core shaft (32). The positioning shaft (34) is arranged in the positioning shaft cavity. The movable positioning core shaft (32) is aligned with the center of the press positioning head (1), and the concentricity of the movable positioning core shaft (32) and the press positioning head (1) is less than 0.1 mm.

2. The special fixture for press-fitting a steel sleeve on a steering knuckle according to claim 1 is characterized in that: A threaded rod portion is provided at the top of the positioning shaft (34), and a threaded hole is provided at the center of the bottom of the movable positioning core shaft (32), and the threaded rod portion is matched and connected with the threaded hole.

3. The special fixture for press-fitting a steel sleeve on a steering knuckle according to claim 1 is characterized in that: An elastic steel ball structure is arranged around the circumferential surface of the bottom of the press positioning head (1).

4. The special fixture for press-fitting a steel sleeve on a steering knuckle according to any one of claims 1 to 3, characterized in that: The fixture tool installation frame (2) comprises a mounting base plate (21), a concave tooling table plate (22) and two supporting guard plates (23), wherein the two supporting guard plates (23) are respectively arranged vertically on two sides of the mounting base plate (21), and the concave tooling table plate (22) is arranged horizontally on the top of the two supporting guard plates (23). A mounting hole is provided in the middle of the concave tooling table plate (22), and the mounting hole is arranged close to the notch side of the concave tooling table plate (22), and the bottom of the supporting core sleeve (31) is installed in the mounting hole.

5. The special fixture for press-fitting a steel sleeve on a steering knuckle according to claim 4 is characterized in that: A neutral plate (4) is arranged between the middle of the concave-shaped tooling table (22) and the middle of the installation base plate (21), and an auxiliary support mechanism (5) is installed in the middle of the neutral plate (4).

6. The special fixture for press-fitting a steel sleeve on a steering knuckle according to claim 5 is characterized in that: The auxiliary support mechanism (5) is provided with a support shaft (51), a limit plate (52) is provided at one end of the support shaft (51), a threaded rod is provided at the other end of the support shaft (51), a nut structure (53) is sleeved on the threaded rod, a circular hole structure is provided in the middle of the neutral plate (4), the middle of the support shaft (51) passes through the circular hole structure, the nut structure (53) and the limit plate (52) are respectively located on both sides of the circular hole structure, the limit plate (52) is arranged close to the concave side of the concave tooling table (22), and a compression spring (54) is also sleeved on the support shaft (51), and the compression spring (54) is arranged between the limit plate (52) and the neutral plate (4).

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