A tensioning mechanism

Abstract

The application relates to the technical field of differential assembly measurement, and particularly discloses a tensioning mechanism, which comprises a tensioning seat, a tensioning pull rod coaxially sliding in the tensioning seat, a plurality of tensioning blocks circumjacent to the tensioning seat, a plurality of notches matched with the tensioning blocks for transverse sliding, a plurality of upper steel balls installed on the tensioning seat, the upper steel balls being in contact with horizontal surfaces on the top of the tensioning blocks respectively, a plurality of lower steel balls installed on the side of the tensioning pull rod, an inclined surface arranged on the side of the tensioning block close to the tensioning pull rod, the lower steel balls being in contact with the inclined surface, an O-shaped ring coaxially sleeved outside the tensioning seat, and the O-shaped ring being correspondingly sleeved outside the tensioning blocks. The tensioning mechanism is small in size, large in tensioning force, self-adaptable to workpiece machining errors, and capable of guaranteeing clamping stability.

Description

Technical Field

[0001] This invention relates to the field of differential assembly and measurement technology, and in particular to a tensioning mechanism. Background Technology

[0002] The differential is a component that enables the left and right wheels to move at different speeds during vehicle transmission. It is a crucial component in modern automobiles. During assembly and measurement, there is a need to securely tighten the internal differential half-shaft gears. This is primarily due to the extremely high precision requirements during differential measurement; the gears must be securely tightened without slippage, and also require high flexibility for easy replacement. Traditional tightening methods typically rely on the elastic deformation of the gripper parts or the extension of the grippers. However, the elastic deformation method is difficult to control for repeatability, and the extension method is limited by machining accuracy, leading to slippage and wobbling during measurement, resulting in unstable measurement results. These methods cannot meet the increasingly stringent clamping and securing requirements.

[0003] Therefore, in order to solve this problem, we propose a tensioning mechanism. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a tensioning mechanism.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A tensioning mechanism includes a tensioning seat, a tensioning rod slidably coaxially disposed inside the tensioning seat, a plurality of tensioning blocks surrounding the tensioning seat, a groove provided in the tensioning seat to be laterally slidably matched with the tensioning blocks, a plurality of upper steel balls mounted on the tensioning seat, the plurality of upper steel balls respectively contacting the horizontal surfaces of the tops of the plurality of tensioning blocks, a plurality of lower steel balls mounted on the side of the tensioning rod, and an inclined surface provided on the side of the tensioning block near the tensioning rod, with the lower steel balls contacting the inclined surface; The tensioning seat is coaxially fitted with an O-ring, and the O-ring is fitted on the outside of several tensioning blocks.

[0006] Preferably, at least three tensioning blocks are provided.

[0007] Preferably, the tensioning seat is fixed on the mounting base of the equipment part base, and the mounting base is provided with the telescopic drive of the equipment drive mechanism. The tensioning rod is mounted on the telescopic drive through the adjusting pad and moves together with the telescopic drive.

[0008] Preferably, the telescopic drive can be driven by a cylinder, hydraulic cylinder or spring, and the telescopic drive performs telescopic movement relative to the mounting base.

[0009] Preferably, an upper steel ball fixing seat is fixedly installed on the tensioning seat, which restricts the upper steel ball to remain stationary, and a lower steel ball fixing seat is fixedly installed on the tensioning rod, which restricts the lower steel ball to remain stationary.

[0010] Preferably, the tensioning seat is used to match the workpiece, and the tensioning blocks are in surface contact with the workpiece.

[0011] Preferably, a plurality of the upper steel balls and the corresponding tensioning blocks form multi-point contact on the same circumference, and a plurality of lower steel balls and the corresponding tensioning blocks form multi-point contact on another circumference.

[0012] Preferably, some of the tensioning blocks are provided with grooves that match the O-rings.

[0013] Compared with the prior art, the beneficial effects of the present invention are: This invention features a compact mechanism that can achieve high tension force to fix the target workpiece even in confined spaces. It automatically adapts to slight dimensional errors, such as non-perpendicularity, caused by workpiece machining mistakes, ensuring clamping stability and meeting the micron-level high requirements for workpiece tensioning without wobbling or slippage. Simultaneously, the tension force is amplified; compared to similar tensioning mechanisms, this mechanism provides a greater tension force and more stable tension, significantly improving the reliability of workpiece tensioning. Attached Figure Description

[0014] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is an isometric view of the present invention; Figure 2 This is a front view of the present invention; Figure 3 for Figure 2 A sectional view; Figure 4 This is a diagram illustrating the working principle of this organization; Figure 5 This is a schematic diagram of the structure of the automotive differential half-shaft gear corresponding to the workpiece of this invention.

[0016] In the diagram: 1. Tensioning seat; 2. Tensioning rod; 3. Tensioning block; 4. Lower steel ball fixing seat; 5. Upper steel ball fixing seat; 6. Adjusting shim; 7. Lower steel ball; 8. O-ring; 9. Telescopic drive; 10. Mounting seat; 11. Upper steel ball; 12. Workpiece; 13. Inner hole. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0018] A tensioning mechanism includes: an upper steel ball 11, a mounting base 10, a telescopic drive 9, an O-ring 8, a lower steel ball 7, an adjusting pad 6, an upper steel ball fixing seat 5, a lower steel ball fixing seat 4, a tensioning block 3, a tensioning rod 2, and a tensioning seat 1.

[0019] Specifically, such as Figure 1 and Figure 2 As shown, the mounting base 10 in the mechanism serves as the base for the equipment parts, and the tensioning seat 1 is fixed on the mounting base 10. The telescopic drive 9 is the equipment drive mechanism, driven by a cylinder / hydraulic cylinder / spring, etc., and can telescopically move relative to the mounting base 10. The tensioning rod 2 and the adjusting pad 6 are mounted on the telescopic drive 9 and move together with it. The adjusting pad 6 is used to adjust and eliminate assembly errors during assembly. The upper steel ball fixing seat 5 is mounted on the tensioning seat 1, restricting the upper steel ball 11 to remain stationary, while the upper steel ball 11 can rotate. The lower steel ball fixing seat 4 restricts the lower steel ball 7 to the tensioning rod 2, and moves telescopically with the tensioning rod 2. The O-ring 8 restricts the tensioning block 3 in the groove of the tensioning seat 1 to prevent it from falling out, and also enables the tensioning block 3 to rebound.

[0020] The equipment referred to in this application as the equipment component base and equipment drive mechanism is currently mainly an automotive differential half-shaft gear end face clearance measuring device, or a reducer starting torque measuring device, or related devices that may be extended to other measuring functions.

[0021] Specifically, in one embodiment, such as Figure 3 As shown, the mechanism has the following components evenly distributed around its circumference: 3 lower steel ball fixing seats 4, 3 lower steel balls 7, 3 tensioning blocks 3, 3 upper steel balls 11, and 3 upper steel ball fixing seats 5. When the tensioning rod 2 is driven upward by the telescopic drive 9, the lower steel balls 7 move accordingly to squeeze the tensioning blocks 3. Under the combined pressure of the upper steel balls 11 and the lower steel balls 7, the 3 tensioning blocks 3 evenly distributed around the circumference of the mechanism will extend horizontally a certain distance and then contact and adhere to the workpiece 12.

[0022] Several upper steel balls 11 and their corresponding tensioning blocks 3 form multiple points of contact on the same circumference, thus forming an upper annular contact surface. Several lower steel balls 7 and their corresponding tensioning blocks 3 form multiple points of contact on another circumference, thus forming a lower annular contact surface. In this way, the upper and lower annular contact surfaces ultimately achieve surface contact between the tensioning blocks 3 and the inner hole 13 of the automotive differential half-shaft gear, forming a stable tensioning structure in space.

[0023] Specifically, in the mechanism: the upper steel ball 11, the lower steel ball 7 and the tensioning block 3 are in point contact, and the tensioning block 3 and the workpiece 12 are in surface contact. In this way, the tensioning block 3 can automatically adapt to the angle and position of the workpiece 12 during the clamping process, so as to achieve the goal of automatically adapting to the workpiece 12, fully fitting and not shaking. Specifically, refer to Figure 4 In one embodiment: the tensioning rod 2 in the mechanism has an upward force F4, the tensioning block 3 is subjected to a normal force F1 from the lower steel ball 7, a supporting force F2 from the upper steel ball 11, and a reaction force F3 from the workpiece 12. The three forces F1 / F2 / F3 are in equilibrium. When the included angle is 10.25°, F3 = F4 ÷ tan10.25. If the driving force F4 of the tensioning rod 2 is 2000N, the clamping force F3, amplified by the mechanism, is 11365N.

[0024] Depend on Figure 4 and Figure 5 It can be seen that the workpiece 12 has an inner hole 13. The bottom columnar part of the tensioning seat 1 is coaxially inserted into the inner hole 13 of the workpiece 12, and the tensioning block 3 corresponds to and can abut against the inner wall of the inner hole 13 of the workpiece 12. For example, there is a 0.5 angle space between the inner wall of the inner hole 13 of the workpiece 12 and the tensioning seat 1. This space is the slight non-perpendicularity caused by the machining error of the workpiece 12. The tensioning block 3 can automatically adapt to the slight non-perpendicularity caused by the machining error of the workpiece 12, ensuring the stability of clamping and meeting the micron-level high requirement of tensioning the workpiece 12 without shaking or slipping. That is, when the tensioning rod 2 is driven upward by the telescopic drive 9, the lower steel ball 7 moves accordingly to squeeze the tensioning block 3. The three tensioning blocks 3 evenly distributed around the circumference of the mechanism will extend horizontally a certain distance under the joint compression of the upper steel ball 11 and the lower steel ball 7, and then contact and stick to the workpiece 12. That is, the tensioning block 3 extends radially, realizing the tensioning and fixing of the workpiece 12. During the clamping process, the tensioning block 3 rotates slightly to adapt to the inner hole 13, which can automatically adapt to the angle and position of the workpiece 12, achieving the goal of automatically adapting to the workpiece 12 and completely fitting without shaking.

[0025] like Figure 5As shown, the workpiece 12 in this application is an automotive differential half-shaft gear. In one embodiment: the bottom of the tensioning seat 1 is inserted into the inner hole 13 of the automotive differential half-shaft gear to firmly clamp the automotive differential half-shaft gear. It is used in conjunction with the equipment of this application to measure the gap between the end face of the automotive differential half-shaft gear and the differential housing. A shim with a thickness of 0.05 mm is placed in the gap, and the measurement repeatability is required to be 0.005 mm. Therefore, the tensioning seat 1 of this application is required to meet the micron-level high requirement of tightening the workpiece 12 without shaking or slipping. Specifically, the tensioning rod 2 is driven upward by the telescopic drive 9, and the lower steel ball 7 moves accordingly to squeeze the tensioning block 3. The three circumferentially distributed tensioning blocks 3 in the mechanism will extend horizontally a certain distance under the combined pressure of the upper steel ball 11 and the lower steel ball 7, and then contact and adhere to the workpiece 12. That is, the tensioning block 3 extends radially, and stops after being subjected to three circumferential squeezing forces from the workpiece 12, achieving the clamping purpose. Ultimately, this allows the tensioning seat 1 to meet the micron-level high requirement of preventing the workpiece 12 from shaking or slipping during tensioning. Afterward, the tensioning rod 2 moves in the opposite direction, and the O-ring 8, under the action of elasticity, drives the tensioning blocks 3 to retract inward and release the workpiece 12, facilitating the removal of the tensioning seat 1 from the workpiece 12. In other words, several tensioning blocks 3 are provided with matching grooves that fit into the O-ring 8. The grooves stabilize the O-ring 8, allowing the O-ring 8 to achieve the springback movement of the tensioning blocks 3.

[0026] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A tensioning mechanism, characterized in that, Includes a tensioning seat (1), inside which a tensioning rod (2) is slidably mounted on the tensioning seat (1), and a plurality of tensioning blocks (3) are arranged around the tensioning seat (1). The tensioning seat (1) has a slot that is slidably matched with the tensioning blocks (3). A plurality of upper steel balls (11) are installed on the tensioning seat (1), and the plurality of upper steel balls (11) are in contact with the horizontal surface of the top of the plurality of tensioning blocks (3). A plurality of lower steel balls (7) are installed on the side of the tensioning rod (2). The side of the tensioning block (3) near the tensioning rod (2) has an inclined surface, and the lower steel balls (7) are in contact with the inclined surface. The tensioning seat (1) is coaxially fitted with an O-ring (8), and the O-ring (8) is fitted on the outside of several tensioning blocks (3).

2. The tensioning mechanism according to claim 1, characterized in that, At least three tensioning blocks (3) shall be provided.

3. The tensioning mechanism according to claim 1, characterized in that, The tensioning seat (1) is fixed on the mounting seat (10) of the equipment part base. The mounting seat (10) is provided with the telescopic drive (9) of the equipment drive mechanism. The tensioning rod (2) is installed on the telescopic drive (9) through the adjusting pad (6) and moves together with the telescopic drive (9).

4. A tensioning mechanism according to claim 3, characterized in that, The telescopic drive (9) can be driven by a cylinder, a hydraulic cylinder or a spring, and the telescopic drive (9) performs telescopic movement relative to the mounting base (10).

5. A tensioning mechanism according to claim 1, characterized in that, An upper steel ball fixing seat (5) is fixedly installed on the tensioning seat (1), which restricts the upper steel ball (11) to remain stationary. A lower steel ball fixing seat (4) is fixedly installed on the tensioning rod (2), which restricts the lower steel ball (7) to remain stationary.

6. A tensioning mechanism according to claim 1, characterized in that, The tensioning seat (1) is used to match the workpiece (12), and several tensioning blocks (3) are in surface contact with the workpiece (12).

7. A tensioning mechanism according to claim 1, characterized in that, Several upper steel balls (11) and corresponding tensioning blocks (3) form multi-point contact on the same circumference, and several lower steel balls (7) and corresponding tensioning blocks (3) form multi-point contact on another circumference.

8. A tensioning mechanism according to claim 1, characterized in that, Several of the tensioning blocks (3) are provided with grooves that match the O-rings (8).

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