A kind of fixed clamp for three-coordinate detection of automobile front steering knuckle after processing

Abstract

This utility model relates to the field of automotive component inspection fixture technology, and discloses a fixing fixture for coordinate measuring machine (CMM) inspection of a front steering knuckle after machining. The fixture includes a clamping structure and a front steering knuckle mounted on the top of the clamping structure. The lower limiting component includes a connecting rod and a threaded shaft mounted on the top of the connecting rod. A cross bar is installed at the bottom of the connecting rod. The connecting hole on the surface of the front steering knuckle is aligned with the threaded positioning hole. The lower limiting component is held and threaded into the threaded positioning hole from the bottom of the inspection table, thus limiting the position of the front steering knuckle. A flathead screwdriver is inserted into the metal top shell, and the rotating screwdriver drives the rubber sleeve to rotate. The friction between the rubber sleeve and the front steering knuckle is used to fix the position of the front steering knuckle, reducing the obstruction of the clamping structure on the front steering knuckle and facilitating dimensional inspection of the front steering knuckle by the CMM.

Description

Technical Field

[0001] This utility model relates to the field of automotive component testing fixture technology, specifically a fixed fixture for coordinate measuring machine testing after machining of an automotive front steering knuckle. Background Technology

[0002] The front steering knuckle (also known as a steering knuckle or steering wheel knuckle) is a crucial component of the front suspension system of a car. Located at the connection point of the front suspension system, it transmits steering force and supports the wheels. It works in conjunction with the suspension and steering system to enable smooth vehicle steering. The front steering knuckle typically consists of several parts, its main structures including: steering arm: the main component connecting the steering system and the wheels, used to transmit steering force; bearing housing: supporting the wheel bearings and ensuring stable wheel operation; support arm connecting hole: used for connection with other components of the suspension system; ball joint connecting hole: used for connection with the steering tie rod, ensuring the range of rotation during steering. Coordinate measuring machine (CMM) inspection is a technique that uses a coordinate measuring machine to accurately measure the three-dimensional geometry and dimensions of an object. This inspection method is widely used in machining, manufacturing, and quality control, especially in production processes requiring high precision, to ensure that the dimensions and shapes of parts meet design requirements.

[0003] A fixing fixture for coordinate measuring machine (CMM) inspection of a front steering knuckle after machining, as disclosed in CN210375054U, includes a base plate, a vertical plate, a reinforcing plate, and screws. In use, the clamping plate and locking nut are first removed from the screws. The front steering knuckle is then placed on the screws, the anti-misplacement guide post, and the support post. The anti-misplacement guide post prevents incorrect placement of the front steering knuckle, and the support post provides support. Next, the locking nut is rotated to press and fix the front steering knuckle onto the fixing fixture via the clamping plate. The design of the reinforcing protrusion and the reinforcing plate increases the strength of the fixture itself. The fixing fixture for CMM inspection of a front steering knuckle after machining has a reasonable structural design, enabling accurate, stable, and efficient fixing of the front steering knuckle, allowing for CMM inspection without blind spots and simultaneous inspection of multiple surfaces.

[0004] The aforementioned patent proposes that a rotating locking nut presses and fixes the front steering knuckle of the car onto a fixed fixture via a clamping plate. The design of the reinforcing protrusion and the reinforcing plate increases the strength of the fixture itself. However, in actual use, the clamping plate will block one side of the front steering knuckle of the car, making it difficult for the probe of the coordinate measuring machine to detect one side of the front steering knuckle of the car. Utility Model Content

[0005] The purpose of this utility model is to provide a fixing fixture for coordinate measuring machine (CMM) inspection after machining of the front steering knuckle of an automobile, so as to solve the problem mentioned in the background art that the clamping plate will block one side of the front steering knuckle of the automobile, making it difficult for the probe of the CMM to inspect one side of the front steering knuckle of the automobile.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a fixed fixture for three-coordinate inspection after machining of an automobile front steering knuckle, comprising a clamping structure and a front steering knuckle installed at the top of the clamping structure. The clamping structure includes an inspection table, a bottom groove is provided at the bottom end of the inspection table, a threaded positioning hole is provided through the top end of the inspection table, a lower limit component is installed inside the threaded positioning hole, an inner fixing component is installed at the top end of the lower limit component, and a side component is installed at the top end of the inspection table.

[0007] The lower limit component includes a connecting rod and a threaded shaft installed at the top of the connecting rod, and a cross bar is installed at the bottom of the connecting rod.

[0008] Preferably, the internal fixing component includes a connecting cylinder and an internal threaded groove formed inside the bottom end of the connecting cylinder, and a rubber sleeve is installed on the outer surface of the connecting cylinder.

[0009] Preferably, a rubber ring is installed on the outer surface of the rubber sleeve, the outer surface of the rubber ring is coated with a wear-resistant coating, and a metal top shell is installed on the top of the rubber sleeve.

[0010] Preferably, the side-mounted component includes a mounting strip and a threaded through hole that extends laterally through the middle of the mounting strip, and external threaded posts are installed on both sides of the bottom end of the mounting strip.

[0011] Preferably, the outer surface of the external threaded post is threaded with an external threaded ring, and a metal washer is installed at the top of the external threaded ring.

[0012] Preferably, the threaded through hole is internally threaded with a threaded rod, and a round-headed block is movably mounted on one end of the threaded rod.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model discloses a fixing fixture for coordinate measuring machine (CMM) inspection of a front steering knuckle after machining. The connecting hole on the surface of the front steering knuckle is aligned with the threaded positioning hole. The lower limit component is held and threaded into the inside of the threaded positioning hole from the bottom of the inspection table to restrict the position of the front steering knuckle. The flat end of a screwdriver is inserted into the inside of the metal top shell. The rotating screwdriver drives the rubber sleeve to rotate. The friction between the rubber sleeve and the front steering knuckle is used to fix the position of the front steering knuckle, reducing the obstruction of the clamping structure on the front steering knuckle and facilitating the CMM to perform dimensional inspection of the front steering knuckle.

[0015] 2. This utility model discloses a fixing fixture for coordinate measuring machine (CMM) inspection after machining of an automotive front steering knuckle. The external threaded post is inserted into the threaded positioning hole, keeping the round head block facing the front steering knuckle. The external threaded ring is rotated to fix the position of the mounting strip. The threaded rod is manually rotated to move the round head block to the front steering knuckle. When the four sets of side-mounted components set on the outside of the front steering knuckle are fixed in position, the inner fixing component and the lower limit component are rotated away from the inside of the threaded positioning hole to avoid the lower limit component affecting the CMM's inspection of the front steering knuckle. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0017] Figure 2 This is a three-dimensional structural diagram of the bottom end of the testing platform of this utility model;

[0018] Figure 3 This is a schematic diagram of the lower limit component and the internal fixing component of this utility model;

[0019] Figure 4 This is a three-dimensional structural diagram of the side-mounted component of this utility model.

[0020] In the diagram: 1. Clamping structure; 11. Testing platform; 111. Bottom groove; 112. Threaded positioning hole; 12. Lower limit component; 121. Connecting rod; 122. Cross bar; 123. Threaded shaft; 13. Internal fastening component; 131. Connecting cylinder; 132. Internal threaded groove; 133. Rubber sleeve; 134. Rubber ring; 135. Wear-resistant coating; 136. Metal top shell; 14. Side component; 141. Resettling strip; 142. Threaded through hole; 143. External threaded post; 144. External threaded ring; 145. Metal gasket; 15. Threaded rod; 16. Round head block; 2. Front steering knuckle. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example 1: Please refer to Figures 1-3A fixed fixture for coordinate measuring machine (CMM) inspection of a front steering knuckle after machining of an automobile includes a clamping structure 1 and a front steering knuckle 2 mounted on the top of the clamping structure 1. The clamping structure 1 includes a testing table 11, with a bottom groove 111 at the bottom end of the testing table 11 and a threaded positioning hole 112 through the top end of the testing table 11. A lower limit member 12 is installed inside the threaded positioning hole 112, and an inner fixing member 13 is installed on the top end of the lower limit member 12. A side-mounted member 14 is installed on the top end of the testing table 11.

[0023] The lower limit component 12 includes a connecting rod 121 and a threaded shaft 123 installed at the top of the connecting rod 121. A cross bar 122 is installed at the bottom of the connecting rod 121. The cross bar 122 facilitates the operator to rotate the lower limit component 12.

[0024] The internal fastening component 13 includes a connecting cylinder 131 and an internal threaded groove 132 formed inside the bottom end of the connecting cylinder 131. A rubber sleeve 133 is installed on the outer surface of the connecting cylinder 131. The connecting cylinder 131 with the internal threaded groove 132 can be threadedly connected to the top end of the threaded shaft 123.

[0025] A rubber ring 134 is installed on the outer surface of the rubber sleeve 133. The outer surface of the rubber ring 134 is coated with a wear-resistant coating 135. A metal top shell 136 is installed on the top of the rubber sleeve 133. The metal top shell 136 is in the shape of a straight line, and the rubber sleeve 133 is in the shape of a frustum.

[0026] In this embodiment: Before testing, the front steering knuckle 2 is placed on the top of the testing platform 11, with the connecting hole on the surface of the front steering knuckle 2 aligned with the threaded positioning hole 112. The lower limit member 12 is held and threaded into the threaded positioning hole 112 from the bottom of the testing platform 11. As the lower limit member 12 rotates, the top end of the threaded shaft 123 rotates from the bottom end of the connecting hole of the front steering knuckle 2, restricting the position of the front steering knuckle 2. Then, the inner fastening member 13 is placed from the top end of the connecting hole of the front steering knuckle 2 onto the top end of the threaded shaft 123, and the flat end of a screwdriver is inserted into the metal top shell 136. The rotating screwdriver drives the rubber sleeve 133 to rotate, causing the connecting cylinder 131 with the internal threaded groove 132 to be threaded onto the outer side of the top of the threaded shaft 123. During the rotation of the inner fixing component 13, since the vertical cross section of the rubber sleeve 133 is frustum-shaped, the rubber ring 134 connected to the outer surface of the rubber sleeve 133 gradually contacts the inner wall of the connecting hole of the front steering knuckle 2. The friction between the rubber ring 134 and the front steering knuckle 2 is used to fix the position of the front steering knuckle 2, reducing the obstruction of the clamping structure 1 on the front steering knuckle 2, and facilitating the coordinate measuring machine to perform dimensional inspection of the front steering knuckle 2.

[0027] Example 2: This example is an improvement upon Example 1. For details, please refer to [link / reference]. Figure 1 , Figure 2 and Figure 4 The side-mounted component 14 includes a mounting strip 141 and a threaded through hole 142 that is laterally opened in the middle of the mounting strip 141. External threaded posts 143 are installed on both sides of the bottom end of the mounting strip 141. The diameter of the external threaded posts 143 is smaller than the diameter of the threaded positioning hole 112.

[0028] The outer surface of the external threaded post 143 is threaded with an external threaded ring 144. A metal washer 145 is installed at the top of the external threaded ring 144. The metal washer 145 will prevent the external threaded ring 144 from being vibrated and affecting the fixing effect of the side component 14.

[0029] The threaded through hole 142 is internally threaded with a threaded rod 15. A round head block 16 is movably mounted on one end of the threaded rod 15. The bottom end of the round head block 16 contacts the top end of the testing table 11. The rotating threaded rod 15 can push the round head block 16 forward to one side of the steering joint 2.

[0030] In this embodiment: when the coordinate measuring machine (CMM) inspects the inside of the connecting hole of the front steering knuckle 2, the mounting strip 141 is placed on the top of the inspection table 11, the external threaded post 143 is inserted into the inside of the threaded positioning hole 112, the round head block 16 is kept facing the side of the front steering knuckle 2, the external threaded ring 144 is rotated, and as the external threaded ring 144 rotates, the metal washer 145 presses against the inspection table 11 to fix the position of the mounting strip 141. The threaded rod 15 is manually rotated to move the round head block 16 to the side of the front steering knuckle 2. After the four sets of side-mounted components 14 set on the outside of the front steering knuckle 2 are fixed in position, the internal fixing component 13 is turned out of the connecting hole using a flathead screwdriver, and then the lower limit component 12 is turned away from the inside of the threaded positioning hole 112 to avoid the lower limit component 12 affecting the CMM's inspection of the front steering knuckle 2.

[0031] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0032] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fixing fixture for coordinate measuring machine (CMM) inspection after machining of a front steering knuckle of an automobile, comprising a clamping structure (1) and a front steering knuckle (2) mounted on the top of the clamping structure (1), characterized in that: The clamping structure (1) includes a detection platform (11), a bottom groove (111) is provided at the bottom end of the detection platform (11), a threaded positioning hole (112) is provided at the top end of the detection platform (11), a lower limit member (12) is installed inside the threaded positioning hole (112), an inner fixing member (13) is installed at the top end of the lower limit member (12), and a side-positioning member (14) is installed at the top end of the detection platform (11). The lower limit member (12) includes a connecting rod (121) and a threaded shaft (123) installed at the top of the connecting rod (121). A cross bar (122) is installed at the bottom of the connecting rod (121).

2. The fixing fixture for coordinate measuring machine (CMM) inspection after machining of an automotive front steering knuckle according to claim 1, characterized in that: The internal fastening component (13) includes a connecting cylinder (131) and an internal threaded groove (132) opened inside the bottom end of the connecting cylinder (131). A rubber sleeve (133) is installed on the outer surface of the connecting cylinder (131).

3. The fixing fixture for coordinate measuring machine (CMM) inspection after machining of an automotive front steering knuckle according to claim 2, characterized in that: A rubber ring (134) is installed on the outer surface of the rubber sleeve (133), and a wear-resistant coating (135) is applied to the outer surface of the rubber ring (134). A metal top shell (136) is installed on the top of the rubber sleeve (133).

4. The fixing fixture for coordinate measuring machine (CMM) inspection after machining of an automotive front steering knuckle according to claim 1, characterized in that: The side-mounted component (14) includes a mounting strip (141) and a threaded through hole (142) that is laterally opened in the middle of the mounting strip (141). External threaded posts (143) are installed on both sides of the bottom end of the mounting strip (141).

5. A fixing fixture for coordinate measuring machine inspection after machining of an automotive front steering knuckle, as described in claim 4, characterized in that: The outer surface of the external threaded column (143) is threaded with an external threaded ring (144), and a metal washer (145) is installed at the top of the external threaded ring (144).

6. A fixing fixture for coordinate measuring machine inspection after machining of an automotive front steering knuckle according to claim 4, characterized in that: The threaded through hole (142) is internally threaded with a threaded rod (15), and a round head block (16) is movably installed at one end of the threaded rod (15).

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