Elastic positioning and clamping structure of dynamic balance clamp

Abstract

The utility model relates to an elastic positioning and clamping structure of a dynamic balance clamp, the elastic positioning and clamping structure comprises a mounting screw, an elastic positioning ring and a sealing ring, the elastic positioning ring is arranged in a clamp groove, a mounting hole and a connecting cavity are arranged in the elastic positioning ring, and the sealing ring is arranged in the mounting hole. The mounting screw penetrates through the mounting hole and fixes the elastic positioning ring on the clamp body, a boss is further arranged on the back face of the elastic positioning ring and inserted into the clamp inner cavity, the peripheral face of the boss is tightly attached to the inner wall face of the clamp inner cavity, a rear guide face is arranged on the back face side of the peripheral face of the elastic positioning ring, and the rear guide face is provided with a guide hole. The sealing ring is embedded in the circumferential surface of the clamp groove and is pressed on the rear guide surface of the elastic positioning ring, the spigot part of the flange yoke is coaxially arranged in the connecting cavity of the elastic positioning ring, and the outer circumferential surface of the spigot part is in close contact with the inner wall surface of the connecting cavity.

Description

Technical Field

[0001] The utility model relates to the field of mechanical equipment, in particular to an elastic positioning clamping structure of a dynamic balancing clamp. Background Art

[0002] The drive shaft is an important component for transmitting power in the automobile transmission system. Its main function is to transmit the power of the engine to the wheels. The drive shaft is a rotating body with high speed and few supports. If the dynamic balance accuracy of the drive shaft does not meet the requirements, the drive shaft will generate additional forces during operation, causing vibration and noise in the drive shaft and its related components. The noise and vibration generated by the car when driving often directly affect the customer's evaluation of the overall comfort of the car. Most customers hope that the driving environment of the car is quiet and the ride is stable when purchasing a car. Therefore, it is particularly important to perform high-precision dynamic balance measurement of the car's drive shaft.

[0003] In traditional transmission shaft dynamic balancing measurement, the fit between the fixture body and the flange fork in the dynamic balancing fixture is a hole-shaft clearance fit, as shown in the attached Figure 1 As shown, a fixture groove is provided in the fixture body, and a stop portion connected to the fixture groove is provided on the flange fork. The inner diameter of the fixture groove is clearance-matched with the outer diameter of the stop portion of the flange fork. Then, through the synergistic action of the connecting components, the connecting components are usually shouldered hexagonal nuts, guide screws, tightening bolts and open pressure plates, etc., the flange fork is stably fixed on the dynamic balancing fixture, and the drive shaft is connected to the flange fork. After that, the operator can measure the size and direction of the uneven mass distribution of the drive shaft on the reference plane. Finally, according to the size and phase of the remaining imbalance, the dynamic balancing piece of the corresponding mass is welded to make the dynamic balance of the drive shaft reach the specified range. At present, the traditional dynamic balancing measurement of the drive shaft is widely used, but the traditional method has its limitations, as follows:

[0004] Since the traditional dynamic balancing measurement of the transmission shaft is a clearance fit, there is an inevitable fit gap between the inner diameter of the fixture groove of the fixture body and the outer diameter of the stop portion of the flange fork. Under the action of gravity, this fit gap will cause an offset between the rotation center of the dynamic balancing fixture and the rotation center of the transmission shaft. Figure 2 As shown in the figure, the larger the fit clearance, the greater the offset, and the greater the deviation impact on the dynamic balancing measurement data. When the transmission shaft is flipped 180° for re-measurement, the offset obviously has a very important impact on the accuracy of the residual imbalance of the transmission shaft and the measurement of uneven mass distribution. Although the appropriate fit clearance is conducive to reducing the impact of the offset on the uneven mass distribution, it is ultimately impossible to avoid the occurrence of the offset. At the same time, too small a fit clearance will also make it very difficult to clamp and remove the flange fork in the fixture body, seriously affecting the production rhythm of the dynamic balancing measurement process and increasing production costs. Utility Model Content

[0005] In view of the defects of the prior art mentioned above, the technical problem to be solved by the utility model is to provide an elastic positioning and clamping structure of a dynamic balancing fixture suitable for dynamic balancing measurement of automobile transmission shafts, which is convenient for clamping and disassembling of the flange fork, and can achieve no fitting gap between the fixture body and the flange fork, avoid the generation of offset, thereby improving the accuracy of dynamic balancing measurement.

[0006] In order to achieve the above-mentioned purpose, the utility model provides an elastic positioning clamping structure of a dynamic balancing clamp, the dynamic balancing clamp comprises a clamp body, a connecting assembly and a flange fork, the flange fork is installed on the clamp body through the connecting assembly, the clamp body is provided with a clamp groove and a clamp inner cavity, the flange fork is provided with a cylindrical stopper portion located in the clamp groove, the elastic positioning clamping structure comprises a mounting screw, an elastic positioning ring and a sealing ring, the elastic positioning ring is located in the clamp groove, the elastic positioning ring is provided with a mounting hole and a cylindrical A connecting cavity, the mounting screw passes through the mounting hole and fixes the elastic positioning ring on the clamp body, a boss is also provided on the back of the elastic positioning ring, the boss is inserted into the inner cavity of the clamp, and the outer peripheral surface of the boss is tightly attached to the inner wall surface of the inner cavity of the clamp, the elastic positioning ring is provided with a rear guide surface on the back side of the outer peripheral surface, the sealing ring is embedded in the peripheral surface of the clamp groove and pressed against the rear guide surface of the elastic positioning ring, the stop portion of the flange fork is coaxially installed in the connecting cavity of the elastic positioning ring, and the outer peripheral surface of the stop portion is in close contact with the inner wall surface of the connecting cavity.

[0007] Furthermore, the fixture groove and the fixture inner cavity of the fixture body are coaxially arranged, and the connecting cavity of the elastic positioning ring and the boss are coaxially arranged.

[0008] Furthermore, a front guide surface is provided at the front surface opening of the connecting cavity.

[0009] Furthermore, the mounting screw is a countersunk screw.

[0010] Furthermore, the number of the mounting holes and the number of the mounting screws are both three and are evenly arranged around the axis of the elastic positioning ring.

[0011] Furthermore, the elastic positioning ring is provided with connecting grooves, which are elliptical in shape and are arranged in 15 numbers.

[0012] Furthermore, the sealing ring is an O-ring and has a Shore hardness greater than 65.

[0013] As described above, the elastic positioning and clamping structure of the dynamic balancing fixture of the utility model has the following beneficial effects:

[0014] 1. By setting a high-hardness O-ring and an elastic locating ring, the rebound force of the sealing ring in a narrow space is used to wrap the rear guide surface on the elastic locating ring, and under the coordinated action of the connecting component, the auxiliary elastic locating ring clamps the stop part of the flange fork, so that there is no matching gap between the inner diameter of the fixture groove and the outer diameter of the stop part of the flange fork, and a small interference fit between the fixture body and the flange fork is achieved to avoid offset and reduce the final residual imbalance of the transmission shaft, thereby improving the accuracy of the dynamic balance measurement of the transmission shaft and the balancing accuracy level of the dynamic balance measurement.

[0015] 2. By arranging a front guide surface on the elastic positioning ring, the arrangement of the front guide surface can facilitate the guiding installation of the connecting cavity of the elastic positioning ring and the stop portion of the flange fork.

[0016] 3. By setting the mounting screws and bosses, the mounting screws can fix the elastic locating ring in the fixture body, and the bosses are embedded in the inner cavity of the fixture and are tightly attached to the inner wall surface of the inner cavity of the fixture, so that the elastic locating ring can be constrained in the inner cavity of the fixture, ensuring the normal operation of the elastic locating ring and the high-hardness O-ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the working process of a traditional transmission shaft dynamic balancing fixture.

[0018] Figure 2 Schematic diagram of offset and backlash generation for a conventional drive shaft dynamic balancing fixture.

[0019] Figure 3 It is a schematic diagram of the elastic positioning clamping structure of the dynamic balancing fixture in the utility model.

[0020] Figure 4 It is a front view of the elastic positioning ring in the utility model.

[0021] Figure 5 It is a cross-sectional view of the elastic positioning ring in the utility model.

[0022] Description of Figure Numbers

[0023] 1 Fixture body

[0024] 101 fixture groove

[0025] 102 fixture cavity

[0026] 2 Connecting components

[0027] 201 Shoulder Hexagon Nut

[0028] 202 guide screw

[0029] 203 hanging bolt

[0030] 204 Opening Plate

[0031] 3 flange fork

[0032] 301 stopper

[0033] 4 Drive shaft

[0034] 5 Dynamic balance sheet

[0035] 6 Mounting screws

[0036] 7 Elastic locating ring

[0037] 701 mounting hole

[0038] 702 connection cavity

[0039] 703 rear guide surface

[0040] 704 boss

[0041] 705 front guide surface

[0042] 706 connection slot

[0043] 8 Sealing ring

[0044] A gap caused by gravity

[0045] BNo gap under gravity

[0046] C The rotation center of the fixture body

[0047] D The center of rotation of the transmission shaft under the action of gravity

[0048] E bias DETAILED DESCRIPTION

[0049] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0050] It should be noted that the structures, proportions, sizes, etc. drawn 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 proportional relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, 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 so on 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.

[0051] See also Figures 3 to 5 The utility model provides an elastic positioning clamping structure of a dynamic balancing clamp, the dynamic balancing clamp comprises a clamp body 1, a connecting assembly 2 and a flange fork 3, the flange fork 3 is installed on the clamp body 1 through the connecting assembly 2, the clamp body 1 is provided with a clamp groove 101 and a clamp inner cavity 102, the flange fork 3 is provided with a stopper portion 301 located in the clamp groove 101, the elastic positioning clamping structure is used for connecting the clamp body 1 and the flange fork 3, comprises a mounting screw 6, an elastic positioning ring 7 and a sealing ring 8, the elastic positioning ring 7 is located in the clamp groove 101, the elastic positioning ring 7 is provided with a mounting hole 701 and a cylindrical connecting cavity 702, the mounting hole 701 is arranged in the connecting cavity 7 02, the mounting screw 6 passes through the mounting hole 701 and fixes the elastic positioning ring 7 on the clamp body 1. A boss 704 is also provided on the back of the elastic positioning ring 7. The boss 704 is embedded in the clamp inner cavity 102, and the outer peripheral surface of the boss 704 is tightly attached to the inner wall surface of the clamp inner cavity 102. The elastic positioning ring 7 is provided with a rear guide surface 703 on the back side of the outer peripheral surface. The sealing ring 8 is embedded in the peripheral surface of the clamp groove 101 and pressed on the rear guide surface 703 of the elastic positioning ring 7. The stop portion 301 of the flange fork 3 is coaxially installed in the connecting cavity 702 of the elastic positioning ring 7, and the outer peripheral surface of the stop portion 301 is in close contact with the inner wall surface of the connecting cavity 702.

[0052] The basic working principle of the elastic positioning clamping structure of the dynamic balancing clamp involved in the utility model is as follows: during assembly, the elastic positioning ring 7 is installed in the clamp groove 101, and the boss 704 on the back of the elastic positioning ring 7 is embedded in the clamp inner cavity 102 on the bottom surface of the clamp groove 101, and the outer peripheral surface of the boss 704 is tightly attached to the inner wall surface of the clamp inner cavity 102, which is convenient for the positioning and installation of the elastic positioning ring 7, and further improves the tightness of the connection between the elastic positioning ring 7 and the clamp body 1, and then the mounting screw 6 is used to cooperate with the mounting hole 701 to fix the elastic positioning ring 7 on the clamp body 1, and after the stop portion 301 of the flange fork 3 is installed in the connecting cavity 702 of the elastic positioning ring 7, the flange fork 3 is installed on the clamp body 1 through the connecting component 2, and the flange fork 3 presses the elastic Pressure is applied to the end face of the elastic positioning ring 7. Since the elastic positioning ring 7 has a rear guide surface 703 on the back side of the outer circumference, the sealing ring 8 embedded in the circumference of the fixture groove 101 is pressed against the rear guide surface 703. By utilizing the resilience of the sealing ring 8 in a narrow space, the elastic positioning ring 7 is deformed to a certain extent, and a circumferentially uniform concentric gap is generated between its circumference and the circumference of the fixture groove 101. At the same time, it is ensured that the elastic positioning ring 7 is in close contact with the stop portion 301 without generating a fitting gap, thereby avoiding the generation of a fitting gap between the inner diameter of the fixture groove 101 and the outer diameter of the stop portion 301 of the flange fork 33, achieving a small interference fit between the fixture body 1 and the flange fork 3, avoiding the generation of offset E, improving the accuracy of the dynamic balancing measurement of the transmission shaft 4, and improving the balancing accuracy level of the dynamic balancing measurement.

[0053] See also Figures 3 to 5 The present invention is further described below with a specific embodiment:

[0054] In this embodiment, see Figure 3 As a preferred design, the clamp groove 101 and the clamp inner cavity 102 of the clamp body 1 are coaxially arranged, and the connecting cavity 702 of the elastic positioning ring 7 is coaxially arranged with the boss 704. In this way, when the elastic positioning ring 7 is installed, the clamp inner cavity 102 can cooperate with the stop portion 301, so that the connecting cavity 702 and the stop portion 301 are coaxially arranged, which can ensure that the clamp groove 101 and the stop portion 301 are coaxially arranged, so that the rotation centers of the clamp body 1, the elastic positioning ring 7 and the flange fork 3 are all located on the same straight line, which is conducive to avoiding the formation of a gap between the clamp body 1, the elastic positioning ring 7 and the flange fork 3 under the action of gravity.

[0055] In this embodiment, see Figure 5 As a preferred design, a front guide surface 705 is provided at the front surface opening of the connecting cavity 702, which can conveniently guide the stop portion 301 of the flange fork 3 to enter the connecting cavity 702 of the elastic positioning ring 7 and be installed in coordination.

[0056] In this embodiment, see Figure 3 As a preferred design, the mounting screw 6 is a countersunk screw, which cooperates with the mounting hole 701 to ensure a flat mounting surface, provide space for the connection between the connecting cavity 702 of the elastic positioning ring 7 and the stop portion 301 of the flange fork 3, and avoid collision between the mounting screw 6 and the stop portion 301.

[0057] In this embodiment, see Figure 4 As a preferred design, the number of mounting holes 701 and mounting screws 6 are both 3 and are evenly arranged around the axis of the elastic positioning ring 7, that is, the central angle formed by adjacent mounting holes 701 and the axis of the elastic positioning ring 7 is 120°. The 3 mounting holes 701 and the 3 mounting screws 6 can better constrain the elastic positioning ring 7 on the clamp body 1, making the installation more secure and avoiding loosening during operation.

[0058] In this embodiment, see Figure 4 As a preferred design, a connecting groove 706 is further provided in the elastic positioning ring 7. The connecting groove 706 is elliptical in shape and is set to 15 in number. A corresponding limiting protrusion is provided on the flange fork 3, which is located on the connecting groove 706, and can further improve the repeat positioning accuracy of the flange fork 3 in the clamp body 1.

[0059] In this embodiment, see Figure 5As a preferred design, the sealing ring 8 is an O-ring with a Shore hardness greater than 65. The high-hardness O-ring has better mechanical strength, elongation and tear resistance, which is conducive to achieving a gap-free fit between the connecting cavity 702 of the elastic positioning ring 7 and the stop portion 301 of the flange fork 3.

[0060] As can be seen from the above, the elastic positioning and clamping structure of the dynamic balancing fixture of the utility model has the following beneficial effects:

[0061] 1. By setting a high-hardness O-ring and an elastic positioning ring 7, the rebound force of the sealing ring 8 in a narrow space is used to wrap the rear guide surface on the elastic positioning ring, and under the coordinated action of the connecting component 2, the auxiliary elastic positioning ring 7 clamps the flange fork 3, so that there is no matching gap between the inner diameter of the clamp groove 101 and the outer diameter of the stop portion 301 of the flange fork 3, so as to achieve a small interference fit between the clamp body 1 and the flange fork 3, avoid bias, reduce the final residual imbalance of the transmission shaft 4, thereby improving the accuracy of the dynamic balance measurement of the transmission shaft 4, and improving the balance accuracy level of the dynamic balance measurement.

[0062] 2. By providing a front guide surface 705 on the elastic positioning ring 7, the provision of the front guide surface 705 can facilitate the guiding installation of the connecting cavity 702 of the elastic positioning ring 7 and the stop portion 301 of the flange fork 3.

[0063] 3. By setting the mounting screw 6 and the boss 704, the mounting screw 6 can fix the elastic positioning ring 7 in the clamp body 1, and the boss 704 is embedded in the clamp inner cavity 102 and is tightly attached to the inner wall surface of the clamp inner cavity 102, so that the elastic positioning ring 7 can be constrained in the clamp inner cavity 102, ensuring the normal operation of the elastic positioning ring 7 and the high-hardness O-ring.

[0064] In summary, the utility model effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0065] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. An elastic positioning clamping structure of a dynamic balancing clamp, the dynamic balancing clamp comprising a clamp body (1), a connecting assembly (2) and a flange fork (3), the flange fork (3) being mounted on the clamp body (1) through the connecting assembly (2), the clamp body (1) being provided with a clamp groove (101) and a clamp inner cavity (102), the flange fork (3) being provided with a cylindrical stopper portion (301) located in the clamp groove (101), characterized in that: The elastic positioning clamping structure comprises a mounting screw (6), an elastic positioning ring (7) and a sealing ring (8); the elastic positioning ring (7) is located in a fixture groove (101); a mounting hole (701) and a cylindrical connecting cavity (702) are provided in the elastic positioning ring (7); the mounting screw (6) passes through the mounting hole (701) and fixes the elastic positioning ring (7) on the fixture body (1); a boss (704) is also provided on the back of the elastic positioning ring (7); the boss (704) is inserted into the fixture inner cavity (102); The outer peripheral surface of the boss (704) is in close contact with the inner wall surface of the clamp inner cavity (102); the elastic positioning ring (7) is provided with a rear guide surface (703) on the back side of the outer peripheral surface; the sealing ring (8) is embedded in the peripheral surface of the clamp groove (101) and pressed against the rear guide surface (703) of the elastic positioning ring (7); the stop portion (301) of the flange fork (3) is coaxially installed in the connecting cavity (702) of the elastic positioning ring (7), and the outer peripheral surface of the stop portion (301) is in close contact with the inner wall surface of the connecting cavity (702).

2. The elastic positioning and clamping structure of the dynamic balancing fixture according to claim 1, characterized in that: The clamp groove (101) and the clamp inner cavity (102) of the clamp body (1) are coaxially arranged, and the connecting cavity (702) and the boss (704) of the elastic positioning ring (7) are coaxially arranged.

3. The elastic positioning and clamping structure of the dynamic balancing fixture according to claim 1, characterized in that: A front guide surface (705) is provided at the front surface opening of the connecting cavity (702).

4. The elastic positioning and clamping structure of the dynamic balancing fixture according to claim 1, characterized in that: The mounting screw (6) is a countersunk screw.

5. The elastic positioning and clamping structure of the dynamic balancing fixture according to claim 1, characterized in that: The number of the mounting holes (701) and the number of the mounting screws (6) are both three and are evenly arranged around the axis of the elastic positioning ring (7).

6. The elastic positioning and clamping structure of the dynamic balancing fixture according to claim 1, characterized in that: The elastic positioning ring (7) is also provided with connection grooves (706), which are elliptical in shape and are arranged in 15 numbers.

7. The elastic positioning and clamping structure of the dynamic balancing fixture according to claim 1, characterized in that: The sealing ring (8) is an O-type sealing ring, and has a Shore hardness greater than 65.

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