Heavy-duty anti-loosening elastic precision limit tolerance adjuster

Abstract

The invention discloses a heavy-load anti-loosening elastic precision limit tolerance adjuster, wherein a center hole is opened in the cylinder, an internal thread is arranged on the inner wall of the lower part of the center hole of the cylinder, the adjusting screw is screwed on the internal thread of the center hole of the cylinder through its external thread, a through hole is opened in the adjusting screw, an annular baffle is arranged on the upper part of the cylinder, a positioning groove is opened on the inner wall of the adjusting screw through hole, an annular groove is opened on the inner wall of the upper part of the adjusting screw through hole, and a limiting groove distributed along the circumferential direction is also opened on the upper part of the adjusting screw. The elastic limiting retaining spring is annular, a fracture is opened on the elastic limiting retaining spring, a positioning plate is arranged on the outer periphery of the elastic limiting retaining spring, and the elastic limiting retaining spring is located in the through hole of the adjusting screw. The invention has the advantages of: having a good adjustment effect, and the adjustment operation is very convenient and quick. At the same time, the tolerance adjuster has a simple structure and low assembly difficulty, which can greatly reduce the manufacturing cost.

Description

Technical Field

[0001] The present invention relates to the technical field of tolerance adjusters, and more specifically to the technical field of tolerance adjusters for fixing automobile battery packs. Background Art

[0002] At present, the market share of electric vehicles is increasing year by year. The battery pack is the core component of electric vehicles. During the manufacturing process of electric vehicles, the battery pack needs to be fixedly installed on the frame. The current common installation method is to set a lifting ear on the battery pack, open corresponding through holes on the lifting ear and the frame respectively, and then lift the battery pack through a lifting device so that the lifting ear of the battery pack contacts the bottom surface of the frame, and then insert bolts into the through holes of the battery pack lifting ear and the frame, and screw nuts on the bolts to fix the battery pack on the frame. However, since the bottom surface of the frame is not a complete plane, it may be uneven due to structural reasons. Therefore, it is impossible to ensure that the battery is installed. Each ear on the pack is in contact with the bottom surface of the frame, which results in a distance tolerance between the ear of the battery pack and the bottom surface of the frame. At this time, if the bolts and nuts are tightened forcibly, the ear on the battery pack will be deformed. Therefore, a tolerance adjustment device is needed to adjust the distance tolerance between the ear of the battery pack and the frame. However, the common tolerance adjustment devices on the market are generally complex in structure, difficult to assemble, and have high manufacturing costs. In addition, when performing tolerance adjustment, the traditional tolerance adjustment device is not only inconvenient to operate, which seriously affects the installation efficiency of the battery pack, but also easily deforms the ear of the battery pack during the adjustment process, and the limit accuracy during the adjustment process is not very ideal. Summary of the invention

[0003] The purpose of the present invention is to solve the above-mentioned deficiencies and to provide a device with a simple structure, which is very convenient for assembly and production, can greatly reduce manufacturing costs, and is very convenient for tolerance adjustment operation, which can effectively improve installation efficiency. At the same time, it can avoid crushing the battery pack ears during the adjustment process, and has a heavy-load anti-loosening elastic precision limit tolerance adjuster with good limit accuracy.

[0004] The technical solutions adopted by the present invention to solve the above technical problems are as follows:

[0005] A heavy-load anti-loosening elastic precision limit tolerance adjuster comprises a column, an adjusting screw, an elastic limit clamping spring and an elastic retaining ring. A center hole is provided in the column, an inner thread is provided on the inner wall of the lower part of the center hole of the column, the adjusting screw is screwed on the inner thread of the center hole of the column through its outer thread, a through hole is provided in the adjusting screw, an annular baffle is provided on the upper part of the column, a positioning groove is provided on the inner wall of the adjusting screw through hole, an annular groove is provided on the inner wall of the upper part of the adjusting screw through hole, and a circumferentially divided groove is provided on the upper part of the adjusting screw. The elastic limit retaining spring is annular, a fracture is opened on the elastic limit retaining spring, a positioning plate is arranged on the outer periphery of the elastic limit retaining spring, the elastic limit retaining spring is located in the through hole of the adjusting screw, and is clamped in the positioning groove through the positioning plate, an arc-shaped spring piece is arranged on the upper part of the elastic limit retaining spring, a limit plate is arranged on the upper end part of the arc-shaped spring piece, the limit plate is located in the limit groove, the elastic retaining ring is clamped in the annular groove, the elastic retaining ring is located above the limit plate, and an annular step surface corresponding to the limit plate is arranged on the inner wall of the center hole of the column.

[0006] The positioning groove on the inner wall of the adjusting screw through hole is annular.

[0007] A central screw hole communicating with the central hole is provided in the upper part of the column.

[0008] Flower teeth are arranged on the peripheral wall of the cylinder below the annular baffle.

[0009] An annular limiting plate is arranged at the bottom of the adjusting screw.

[0010] Anti-slip grooves are arranged on the bottom surfaces of the adjusting screw and the annular limiting plate.

[0011] The upper part of the central hole of the column is cone-shaped.

[0012] The positioning plates on the elastic limit clamp spring are evenly distributed along the circumferential direction, and the number of the positioning plates is 3 to 6. The arc-shaped spring pieces on the elastic limit clamp spring are evenly distributed along the circumferential direction, and the number of the arc-shaped spring pieces is 3 to 6.

[0013] The elastic limiting clamping spring is made of steel.

[0014] The beneficial effects that can be achieved by the present invention using the above technical solution are:

[0015] 1. When using the tolerance adjuster to fix the battery pack on the frame of the electric vehicle, first insert the column into the through hole of the battery pack ear, and force the teeth on the outer peripheral wall of the column into the inner peripheral wall of the through hole of the battery pack ear, and at the same time make the end face of the annular baffle contact with the ear, and then screw the adjusting screw on the internal thread of the center hole of the column, and then lift the battery pack by lifting equipment, and turn the adjusting screw by a wrench to make the adjusting screw and the anti-slip grooves on the annular limit plate contact with the bottom surface of the frame, thereby achieving the purpose of adjusting the tolerance of the distance between the battery pack ear and the bottom surface of the frame, with a good adjustment effect, and the adjustment operation is very convenient and quick, which effectively improves the installation efficiency of the battery pack. At the same time, the tolerance adjuster has a simple structure, low assembly difficulty, and can greatly reduce the manufacturing cost.

[0016] 2. When adjusting the adjusting screw with a wrench, when the anti-skid patterns of the adjusting screw and the annular limit plate come into contact with the bottom surface of the frame, if the adjusting screw continues to be rotated with the wrench, the torque required for rotation increases, and the clamping force of the arc-shaped spring piece on the wrench head is less than the rotation torque, so that the wrench head overcomes the friction between the arc-shaped spring piece and slips, achieving the function of torque limitation, so that the adjusting screw can no longer move toward the frame, thereby avoiding damage to the lifting ear of the battery pack.

[0017] 3. When the wrench head of the wrench is stuck between the arc-shaped spring pieces, the arc-shaped spring pieces are deformed under the squeezing effect of the wrench head on the arc-shaped spring pieces, thereby driving the limit plate at the upper end of the arc-shaped spring pieces to expand outward along the limit groove, so that the outer end of the limit plate moves to above the annular step surface. During the movement of the adjusting screw, if the outer end of the limit plate contacts the annular step surface of the column, the adjusting screw can no longer be rotated, so that the adjusting screw cannot be detached from the column, thereby achieving the purpose of limiting the adjusting screw and avoiding the phenomenon that the adjusting screw is unscrewed from the column when the tolerance is too large.

[0018] 4. When rotating the adjusting screw to adjust the tolerance, after the limit plate of the elastic limit spring contacts the annular step surface, if the adjusting screw continues to be turned, the limit plate may be deformed to a certain extent, thereby affecting the limiting accuracy of the adjusting screw. By limiting the limit plate with an elastic retaining ring, deformation of the limit plate can be avoided, thereby improving the limiting accuracy of the limit plate of the elastic limit spring on the adjusting screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 for Figure 1 AA cross-sectional view of the present invention;

[0021] Figure 3 for Figure 1BB cross-sectional view of the present invention;

[0022] Figure 4 for Figure 1 A schematic diagram of the structure of the middle elastic limit spring;

[0023] Figure 5 for Figure 1 A partial enlarged schematic diagram of point C in the middle;

[0024] Figure 6 for Figure 2 Schematic diagram of the structure of the elastic retaining ring. DETAILED DESCRIPTION

[0025] Depend on Figure 1 , Figure 2 and Figure 3 As shown, a heavy-load anti-loosening elastic precision limit tolerance adjuster includes a column 1, an adjusting screw 2, an elastic limit retaining spring 3 and an elastic retaining ring 20. A center hole 4 is opened in the column 1, and the upper part of the center hole 4 is conical. A center screw hole 16 connected to the center hole 4 is opened in the upper part of the column 1, and an internal thread 5 is arranged on the inner wall of the lower part of the center hole 4 of the column 1. The adjusting screw 2 is screwed on the internal thread 5 of the center hole 4 of the column 1 through its external thread 6. A through hole 7 is opened in the adjusting screw 2, an annular baffle 9 is arranged on the upper part of the column 1, and flower teeth 17 are arranged on the outer peripheral wall of the column 1 below the annular baffle 9. An annular limit plate 8 is arranged at the bottom of the adjusting screw 2, and anti-slip patterns 18 are arranged on the bottom surfaces of the adjusting screw 2 and the annular limit plate 8. A positioning groove 12 is provided on the inner wall of the through hole 7 of the adjusting screw 2. The positioning groove 12 is annular. An annular groove 21 is provided on the inner wall of the upper part of the through hole 7 of the adjusting screw 2. A circumferentially distributed limiting groove 19 is also provided on the upper part of the adjusting screw 2. Figure 4 As shown, the elastic limit clamp 3 is annular, and the elastic limit clamp 3 is made of steel. A fracture 10 is opened on the elastic limit clamp 3. A positioning plate 11 is arranged on the outer periphery of the elastic limit clamp 3. The positioning plates 11 are evenly distributed in the circumferential direction. The number of the positioning plates 11 is 3 to 6. The elastic limit clamp 3 is located in the through hole 7 of the adjusting screw 2, and is clamped in the positioning groove 12 through the positioning plate 11. An arc-shaped spring piece 13 is arranged on the upper part of the elastic limit clamp 3. The arc-shaped spring piece 13 is evenly distributed in the circumferential direction. The number of the arc-shaped spring pieces 13 is 3 to 6. A limiting plate 14 is arranged on the upper end of the arc-shaped spring piece 13. The limiting plate 14 is located in the limiting groove 19. Figure 2 , Figure 5 and Figure 6 As shown, the elastic retaining ring 20 is clamped in the annular groove 21 . The elastic retaining ring 20 is located above the limiting plate 14 . An annular step surface 15 corresponding to the limiting plate 14 is provided on the inner wall of the central hole 4 of the column 1 .

[0026] When the heavy-load anti-loosening elastic precision limit tolerance adjuster is used to fix the battery pack on the frame of an electric vehicle, a plurality of lifting ears are firstly provided on the battery pack, and a first connecting hole is opened on the lifting ears, and a second connecting hole coaxial with the first connecting hole of the lifting ears is opened on the frame, and then Figure 1The tolerance adjuster is rotated 180° and turned upside down, then the adjusting screw 2 is removed from the column 1, and then the column 1 is inserted into the first connecting hole of the battery pack ear from bottom to top, and upward pressure is applied to the column 1, so that the flower teeth 17 on the outer peripheral wall of the column 1 are forcibly embedded in the inner peripheral wall of the first connecting hole of the battery pack ear, and at the same time, the end face of the annular baffle 9 is in contact with the ear. The flower teeth 17 have a good anti-loosening effect on the column 1, and the annular baffle 9 has a supporting effect on the battery pack after installation. Then the adjusting screw 2 is screwed onto the internal thread 5 of the center hole 4 of the column 1, and the battery pack is lifted up by the lifting equipment so that the distance between the lifting ear of the battery pack and the bottom surface of the frame reaches a preset value. At this time, the annular limit plate 8 of the adjusting screw 2 does not contact the bottom surface of the frame. Then, the staff takes a wrench, passes the wrench head through the second connecting hole of the frame, and then inserts it into the through hole 7 of the adjusting screw 2, and clamps it between the arc-shaped spring pieces 13. The wrench head is clamped by the arc-shaped spring pieces 13. At this time, under the squeezing effect of the wrench head on the arc-shaped spring piece 13, the arc-shaped spring piece 13 is deformed, thereby driving the limit plate 14 at the upper end of the arc-shaped spring piece 13 to expand outward along the limit groove 19, so that the outer end of the limit plate 14 moves to above the annular step surface 15. Then, the adjusting screw 2 is rotated by a wrench to move the adjusting screw 2 in a direction away from the central screw hole 16 until the adjusting screw 2 and the anti-skid pattern 18 of the annular limiting plate 8 contact the bottom surface of the vehicle frame. At this time, if the adjusting screw 2 is continued to be rotated by the wrench, the torque required for rotation increases, and the clamping force of the arc spring piece 13 on the wrench head is less than the rotation torque, so that the wrench head overcomes the friction between the arc spring piece 13 and slips, achieving the function of torque limitation, so that the adjusting screw 2 can no longer continue to move in the direction of the vehicle frame, avoiding damaging the lifting ear of the battery pack. During the movement of the adjusting screw 2, if the outer end of the limiting plate 14 contacts the annular step surface 15 of the column 1, the adjusting screw 2 can no longer be rotated, so that the adjusting screw 2 cannot be detached from the column 1, achieving the purpose of limiting the adjusting screw 2, and avoiding the phenomenon of the adjusting screw 2 being unscrewed from the column 1 if the tolerance is too large. When the limit plate 14 contacts the annular step surface 15, if the adjusting screw 2 is continued to be turned, the limit plate 14 may be deformed to a certain extent, thereby affecting the limiting accuracy of the adjusting screw 2. By limiting the limit plate 14 with the elastic retaining ring 20, the limit plate 14 can be prevented from being deformed, thereby improving the limiting accuracy of the limit plate 14 of the elastic limit clamp 3 on the adjusting screw 2. Next, take the bolts and nuts used to fasten the battery pack, pass the bolts through the second connection hole of the frame, the through hole 7 of the adjusting screw 2, and the center hole 4 of the column 1 in turn, screw them into the center screw hole 16 of the column 1, and pass them out from the center screw hole 16, then screw the nut on the part where the bolt passes through, and make the nut close to the end face of the column 1 to complete the fixed installation of the battery pack.It should be noted that during the process of rotational adjustment of the adjusting screw 2, if the outer end of the limit plate 14 contacts the annular step surface 15 of the column 1, it means that the adjusting screw 2 has moved to the maximum stroke. If at this time the anti-slip grooves 18 on the adjusting screw 2 and the annular limit plate 8 have not yet contacted the bottom surface of the frame, the adjusting screw 2 should not be rotated any further, but the bolts and nuts should be tightened forcibly to deform the lifting ears of the battery pack so that the anti-slip grooves 18 on the adjusting screw 2 and the annular limit plate 8 contact the bottom surface of the frame.

Claims

1. Heavy-load anti-loosening elastic precision limit tolerance adjuster, characterized by: It includes a column, an adjusting screw, an elastic limiting retaining spring and an elastic retaining ring. A center hole is provided in the column, an inner thread is provided on the inner wall of the lower part of the center hole of the column, the adjusting screw is screwed on the inner thread of the center hole of the column through its outer thread, a through hole is provided in the adjusting screw, an annular baffle is provided on the upper part of the column, a positioning groove is provided on the inner wall of the adjusting screw through hole, an annular groove is provided on the inner wall of the upper part of the adjusting screw through hole, and a limiting groove distributed along the circumferential direction is also provided on the upper part of the adjusting screw. The elastic limiting retaining spring is annular and has a fracture. A positioning plate is arranged on the outer periphery of the elastic limit retaining spring, the elastic limit retaining spring is located in the through hole of the adjusting screw and is clamped in the positioning groove through the positioning plate, an arc-shaped spring piece is arranged on the upper part of the elastic limit retaining spring, and a limiting plate is arranged on the upper end part of the arc-shaped spring piece, the limiting plate is located in the limiting groove, the elastic retaining ring is clamped in the annular groove, the elastic retaining ring is located above the limiting plate, an annular step surface corresponding to the limiting plate is arranged on the inner wall of the center hole of the column, a center screw hole connected with the center hole is opened in the upper part of the column, and flower teeth are arranged on the outer peripheral wall of the column below the annular baffle.

2. The heavy-load anti-loosening elastic precise limit tolerance adjuster according to claim 1 is characterized in that: The positioning groove on the inner wall of the adjusting screw through hole is annular.

3. The heavy-load anti-loosening elastic precise limit tolerance adjuster according to claim 1 or 2, characterized in that: An annular limiting plate is arranged at the bottom of the adjusting screw.

4. The heavy-load anti-loosening elastic precise limit tolerance adjuster according to claim 3 is characterized in that: Anti-slip grooves are arranged on the bottom surfaces of the adjusting screw and the annular limiting plate.

5. The heavy-load anti-loosening elastic precise limit tolerance adjuster according to claim 1 or 2, characterized in that: The upper part of the central hole of the column is cone-shaped.

6. The heavy-load anti-loosening elastic precise limit tolerance adjuster according to claim 1 or 2, characterized in that: The positioning plates on the elastic limit clamp spring are evenly distributed along the circumferential direction, and the number of the positioning plates is 3 to 6. The arc-shaped spring pieces on the elastic limit clamp spring are evenly distributed along the circumferential direction, and the number of the arc-shaped spring pieces is 3 to 6.

7. The heavy-load anti-loosening elastic precise limit tolerance adjuster according to claim 1 or 2, characterized in that: The elastic limiting clamping spring is made of steel.

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