Dynamic balance clamp for constant velocity universal joint automobile transmission shaft assembly

Abstract

The utility model discloses a dynamic balance clamp of a constant velocity universal joint automobile transmission shaft assembly. A dynamic balance clamp body is installed on a high-speed joint besides-star wheel through a bolt. The dynamic balance clamp is characterized in that one end of a dynamic balance clamp body extends outwards to form a positioning inner diameter face, the positioning inner diameter face can wrap the outer wall of the high-speed joint besides-star wheel, and a plurality of elastic set screws penetrate through the positioning inner diameter face and abut against the outer diameter of the high-speed joint besides-star wheel; the elastic set screws are arranged on the positioning inner diameter face in a surrounding array mode. According to the dynamic balance clamp, the offset influence caused by clearance fit in the design of a traditional dynamic balance clamp body is avoided, and the adverse influence of gravity when a transmission shaft assembly constant velocity joint besides-star wheel is clamped in the dynamic balance clamp body is overcome through the elastic force of the steel balls of the elastic set screws; the repeated positioning precision of the constant velocity joint besides-star wheel clamped in the dynamic balance clamp body is remarkably improved, and the dynamic balance clamp body is simple in structure and practical.

Description

Technical Field

[0001] The utility model relates to relevant technical fields such as dynamic balancing correction processing, and in particular to a dynamic balancing fixture for a constant velocity universal joint automobile transmission shaft assembly. Background Art

[0002] See also Figure 1 to Figure 2 As shown, the dynamic balancing correction process of the rotor (drive shaft assembly) is the process of correcting the uniformity of the mass distribution of the rotating rotor (drive shaft assembly) to meet the specified requirements, and thereby reducing the vibration of the rotating rotor. The traditional dynamic balancing fixture body and the outer star wheel of the constant velocity joint are matched with a hole-shaft clearance fit, that is, a small clearance fit is used between the positioning inner diameter of the dynamic balancing fixture body and the outer diameter of the constant velocity joint outer star wheel, and then through the coordinated action of other mechanical parts (usually nuts, bolts, guide screws and clamping plates), the constant velocity joint is stably and accurately fixed to the dynamic balancing fixture body, and then the high-speed running drive shaft assembly is started, and the size and direction of the uneven mass distribution are detected on the corresponding balancing correction plane. Finally, the dynamic balancing plate is welded there to correct the uniformity of the mass distribution to meet the specified technical requirements. However, due to the clearance fit, there must be a gap between the positioning inner diameter of the dynamic balancing fixture body and the outer diameter of the outer star wheel of the constant velocity joint ( Figure 1 and Figure 2 During the clamping process of the constant velocity joint of the transmission shaft assembly in the dynamic balancing fixture body, due to the effect of gravity, the matching clearance will cause the rotation center of the rotor (transmission shaft assembly) to Figure 2 The C point position) and the measuring rotation center of the dynamic balancing machine ( Figure 2 The position of point B in the middle) produces an offset ( Figure 2 The position of point D in the middle. The larger the gap, the greater the offset, the greater the deviation impact on the dynamic balancing measurement data, and the greater the subsequent dynamic balancing correction processing error. When flipped 180° for re-measurement, the impact of the offset on the uneven mass distribution becomes more obvious and uncertain. The residual unbalance measurement error caused by the clearance between the fixture positioning inner diameter and the outer diameter of the constant velocity joint outer star wheel cannot accurately reflect the residual unbalance of the rotor (drive shaft assembly) after dynamic balancing correction, whether in the initial dynamic balancing calibration or in the dynamic balancing recalibration.

[0003] Although a small fit clearance is beneficial to reduce the impact of offset on the uneven mass distribution, thereby improving the accuracy of dynamic balancing measurement data and reducing the final residual unbalanced weight through subsequent correction processing; however, a too small fit clearance will make it difficult to clamp and remove the rotor workpiece in the fixture, seriously affecting the production rhythm of the dynamic balancing process, reducing production efficiency and increasing production costs.

[0004] To resolve this contradiction, most foreign dynamic balancing machines use a power expansion sleeve type dynamic balancing fixture body. However, this type of fixture has a complex structure and requires pneumatic / elastic expansion sleeve type positioning and clamping electromechanical system components to be configured on the measuring pendulum frames at both ends of the dynamic balancing machine. This system component is expensive and is difficult for domestic automobile drive shaft companies to accept and cannot be simply introduced. Utility Model Content

[0005] In view of this, in order to solve the above problems, the purpose of the utility model is to provide a dynamic balancing fixture for a constant velocity universal joint automobile transmission shaft assembly, wherein the high-speed joint outer star wheel is installed on the dynamic balancing fixture body by bolts; it is characterized by comprising:

[0006] Elastic set screws;

[0007] One end of the dynamic balancing fixture body extends outward to form a positioning inner diameter surface, the positioning inner diameter surface can cover the outer wall of the high-speed joint outer star wheel, and a plurality of elastic set screws penetrate the positioning inner diameter surface and abut against the outer diameter of the high-speed joint outer star wheel;

[0008] The elastic set screws are arranged in a surrounding array on the positioning inner diameter surface.

[0009] The above-mentioned constant velocity universal joint automobile drive shaft assembly dynamic balancing fixture is characterized in that the elastic locking screw includes: a locking screw, a compression spring, and a bearing steel ball; the locking screw passes through the dynamic balancing fixture body and is installed on the bearing steel ball, and the compression spring is installed inside the locking screw and abuts against the bearing steel ball.

[0010] The above-mentioned constant velocity universal joint automobile transmission shaft assembly dynamic balancing fixture is characterized in that the elastic set screws are distributed in two layers on the outer wall of the positioning inner diameter surface, so that a circular auxiliary positioning surface is formed between the elastic set screws and the high-speed joint outer star wheel.

[0011] The above-mentioned constant velocity universal joint automobile transmission shaft assembly dynamic balancing fixture is characterized in that the two layers of elastic set screws are arranged adjacent to each other.

[0012] The above-mentioned constant velocity universal joint automobile transmission shaft assembly dynamic balancing fixture is characterized in that each layer of the elastic set screws includes eight elastic set screws.

[0013] The above-mentioned constant velocity universal joint automobile transmission shaft assembly dynamic balancing fixture is characterized in that it also includes: a guide screw; the guide screw passes through the dynamic balancing fixture body and is installed on the bolt.

[0014] The above-mentioned constant velocity universal joint automobile transmission shaft assembly dynamic balancing fixture is characterized in that the bolt passes through the dynamic balancing fixture body and the high-speed joint outer star wheel in sequence, and the two ends of the bolt are clamped by nuts and clamping plates.

[0015] Compared with the prior art, the above technical solution has the following positive effects:

[0016] Through the application of the utility model, a dynamic balancing fixture for a constant velocity universal joint automobile drive shaft assembly is provided. The present application avoids the positioning center offset effect caused by the clearance fit in the design of the traditional dynamic balancing fixture body, and utilizes the elastic force of the steel ball of the elastic set screw to overcome the adverse effect of gravity when the outer star wheel of the constant velocity joint of the drive shaft assembly is clamped in the dynamic balancing fixture body, significantly improving the repeat positioning accuracy of the outer star wheel of the constant velocity joint when clamped in the dynamic balancing fixture body and facilitating the loading and unloading of the constant velocity universal joint drive shaft in the fixture, basically reaching the technical level equivalent to that of foreign power expansion sleeve type dynamic balancing fixture bodies and improving production efficiency. As can be seen from Figures 3 and 4, the structure of the dynamic balancing fixture body is simple and practical, and only two groups of elastic set screws are added to the traditional dynamic balancing fixture body to form a circular ring auxiliary positioning surface. There is no requirement for modification of the dynamic balancing machine, and it can be easily used in general domestic automobile drive shaft dynamic balancing machines to reduce the final residual unbalanced grams of the constant velocity joint automobile drive shaft, conforming to the market demand for dynamic balancing accuracy of the constant velocity joint drive shaft assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a dynamic balancing fixture body in the prior art.

[0018] Figure 2 It is a schematic diagram of the gap generated between the positioning surface of the dynamic balancing fixture body and the outer star wheel of the vehicle transmission shaft clamped by the constant velocity universal joint in the prior art.

[0019] Figure 3 The utility model is a front view of a dynamic balancing fixture for a constant velocity universal joint automobile transmission shaft assembly.

[0020] Figure 4 The utility model is a right side view of a dynamic balancing fixture for a constant velocity universal joint automobile transmission shaft assembly.

[0021] Figure 3 , Figure 4 In the middle: 1. Elastic set screw; 11. Set screw; 12. Compression spring; 13. Bearing steel ball; 2. High-speed joint outer star wheel; 3. Dynamic balancing fixture body; 4. Nut; 5. Bolt; 6. Positioning inner diameter surface; 7. Guide screw; 8. Clamping pressure plate. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific implementations, but they are not intended to limit the present invention.

[0023] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect that the utility model can produce and the purpose that can be achieved, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0024] like Figure 3 to Figure 4 As shown, a preferred embodiment of a dynamic balancing fixture of a constant velocity universal joint automobile transmission shaft assembly is shown, wherein the high-speed joint outer star wheel 2 is mounted on the dynamic balancing fixture body 3 by means of bolts 5; wherein, it comprises: an elastic set screw 1; one end of the dynamic balancing fixture body 3 extends outward to form a positioning inner diameter surface 6, the positioning inner diameter surface 6 can cover the outer wall of the high-speed joint outer star wheel 2, a plurality of elastic set screws 1 penetrate the positioning inner diameter surface 6 and abut against the outer diameter of the high-speed joint outer star wheel 2; wherein the elastic set screws 1 are arranged in a surrounding array on the positioning inner diameter surface 6.

[0025] In actual use, even though the positioning inner diameter surface of the dynamic balancing fixture body 3 and the outer diameter of the high-speed joint outer star wheel 2 are still designed with a clearance fit that is easy to load and unload, a number of elastic set screws 1 are in contact with the high-speed joint outer star wheel 2 to achieve auxiliary positioning and support of the high-speed joint outer star wheel 2, thereby achieving a "gap-free" fit in the positioning function. In this way, when the constant velocity joint outer star wheel of the drive shaft assembly is clamped in the dynamic balancing fixture body, due to the influence of gravity, the rotation center of the rotor (drive shaft assembly) generated between the fitting gap between the two and the measuring rotation center of the dynamic balancing machine is offset from the clamping position, thereby improving the repeatability of the positioning accuracy of the constant velocity joint outer star wheel in the dynamic balancing fixture body.

[0026] The utility model also has the following implementation methods based on the above:

[0027] Further, a dynamic balancing fixture for a constant velocity universal joint automobile transmission shaft assembly, wherein the elastic set screw 1 comprises: a set screw 11, a compression spring 12, and a bearing steel ball 13; the set screw 11 penetrates the dynamic balancing fixture body 3 and is installed on the bearing steel ball 13, and the compression spring 12 is installed inside the set screw and abuts against the bearing steel ball 13. Specifically, the elastic force of the compression spring 12 presses the bearing steel ball 13, so that the bearing steel ball 13 can abut against the outer diameter of the high-speed joint outer star wheel 2, thereby reducing the distance between the dynamic balancing fixture body 3 and the high-speed joint outer star wheel 2.

[0028] Furthermore, a dynamic balancing fixture for a constant velocity universal joint automobile transmission shaft assembly is provided, wherein the elastic set screws 1 are distributed in two layers on the outer wall of the positioning inner diameter surface 6, so that a circular auxiliary positioning surface is formed between the elastic set screws 1 and the high-speed joint outer star wheel 2.

[0029] Furthermore, a dynamic balancing fixture for a constant velocity universal joint automobile transmission shaft assembly is provided, wherein two layers of elastic set screws 1 are arranged adjacent to each other.

[0030] Furthermore, a dynamic balancing fixture for a constant velocity universal joint automobile transmission shaft assembly is provided, wherein each layer of elastic set screws 1 includes eight elastic set screws 1 .

[0031] Specifically, 16 elastic set screws 1 are provided between the positioning inner diameter surface 6 of the dynamic balancing fixture body 3 and the outer wall of the high-speed joint outer star wheel 2, and the 16 elastic set screws 1 are divided into two layers, each layer includes eight elastic set screws 1, so that a circular ring auxiliary positioning surface is formed between the elastic set screws 1 and the high-speed outer star wheel 2, that is, the positioning inner diameter surface 6 of the dynamic balancing fixture body 3 and the outer diameter of the high-speed joint outer star wheel 2 still adopt a clearance fit design that is easy to load and unload, and the "circular ring surface" positioning structure composed of 16 bearing steel balls 13 protruding from the positioning inner diameter surface 6 of the dynamic balancing fixture body 3 is used to assist in positioning and supporting the outer diameter of the constant velocity joint outer star wheel, thereby realizing "gap-free" fit in the positioning function.

[0032] Furthermore, a dynamic balancing fixture for a constant velocity universal joint automobile transmission shaft assembly further includes: a guide screw 7 ; the guide screw 7 passes through the dynamic balancing fixture body 3 and is installed on the bolt 5 .

[0033] Furthermore, a dynamic balancing fixture for a constant velocity universal joint automobile transmission shaft assembly is provided, wherein a bolt 5 sequentially passes through a dynamic balancing fixture body 3 and a high-speed joint outer star wheel 2, and both ends of the bolt 5 are clamped by nuts 4 and clamping plates 8. Specifically, the installation between the dynamic balancing fixture body 3 and the high-speed joint outer star wheel 2 is made tighter.

[0034] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A dynamic balancing fixture for a constant velocity universal joint automobile transmission shaft assembly, wherein the high-speed joint outer star wheel is installed on the dynamic balancing fixture body by bolts; characterized in that: include: Elastic set screws; One end of the dynamic balancing fixture body extends outward to form a positioning inner diameter surface, the positioning inner diameter surface can cover the outer wall of the high-speed joint outer star wheel, and a plurality of elastic set screws penetrate the positioning inner diameter surface and abut against the outer diameter of the high-speed joint outer star wheel; The elastic set screws are arranged in a surrounding array on the positioning inner diameter surface.

2. A dynamic balancing fixture for a constant velocity universal joint automobile transmission shaft assembly according to claim 1, characterized in that: The elastic set screw includes: a set screw, a compression spring, and a bearing steel ball; the set screw passes through the dynamic balancing fixture body and is installed on the bearing steel ball, and the compression spring is installed inside the set screw and abuts against the bearing steel ball.

3. The dynamic balancing fixture for a constant velocity universal joint automobile transmission shaft assembly according to claim 1, characterized in that: The elastic set screws are distributed in two layers on the outer wall of the positioning inner diameter surface, so that a circular auxiliary positioning surface is formed between the elastic set screws and the high-speed outer star wheel.

4. A dynamic balancing fixture for a constant velocity joint automobile transmission shaft assembly according to claim 3, characterized in that: The two layers of elastic set screws are arranged adjacent to each other.

5. The dynamic balancing fixture for a constant velocity universal joint automobile transmission shaft assembly according to claim 3, characterized in that: Each layer of the elastic set screws includes eight elastic set screws.

6. The dynamic balancing fixture for a constant velocity joint automobile transmission shaft assembly according to claim 1, characterized in that: Also includes: Guide screw; the guide screw passes through the dynamic balancing fixture body and is installed on the bolt.

7. A dynamic balancing fixture for a constant velocity universal joint automobile transmission shaft assembly according to claim 1, characterized in that: The bolt passes through the dynamic balancing fixture body and the high-speed outer star wheel in sequence, and both ends of the bolt are clamped by nuts and clamping plates.

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