Pretightening force controllable gasket

Abstract

The utility model discloses a washer with controllable pretightening force, which comprises a reinforcement platform (1), an unloading groove (2), a deformation platform (3) and an inner hole (4) arranged in the middle of the washer, and is characterized in that the reinforcement platform (1) and the deformation platform (3) form an inner step and an outer step, the deformation platform (3) is higher than the reinforcement platform (1), the unloading groove (2) is arranged between the reinforcement platform (1) and the deformation platform (3), and the inner hole (4) is arranged in the inner hole (4). The pretightening force controllable gasket can be of an inner table type structure that the deformation table (3) is arranged inside the reinforcement table (1) or of an outer table type structure that the deformation table (3) is arranged outside the reinforcement table (1), the reinforcement table (1) is an annular protruding table, the height of the reinforcement table (1) is 0.1-0.2 time of the diameter of the inner hole (4), the unloading groove (2) is a smooth annular groove with one side tangent to the deformation table (3), and the other side of the unloading groove (2) is an annular groove with the other side tangent to the deformation table (3). And the width of the unloading groove (2) is 0.1-0.2 time of the thickness of the gasket. The gasket pre-tightening force control device is simple in structure, convenient to operate, reliable to use and suitable for being popularized and used with controllable gasket pre-tightening force.

Description

Technical Field

[0001] The utility model belongs to the technical field of fasteners, and in particular relates to a washer with controllable preload force. Background Art

[0002] Washers are one of the common fasteners, mainly used in the combination of bolts or studs and nuts to increase the load-bearing area or prevent rotation and slip, thereby improving the reliability of the connection. They are widely used in production and life. Washers are of various types and shapes. The more common washers include flat washers, spring washers, corrugated washers, toothed washers, conical washers, etc. In the prior art, the increase in preload force during the installation process of threaded fasteners is continuous, and the reaction force provided by the washers is also continuous. Without the help of special instruments or tools (such as torque wrenches, etc.), the preload force cannot be controlled more accurately. This brings many inconveniences to the normal use of washers. Utility Model Content

[0003] The utility model aims to overcome the above disadvantages and provide a preload controllable washer with simple structure, convenient operation and reliable use.

[0004] The purpose of the utility model and the solution of its main technical problems are achieved by adopting the following technical solutions:

[0005] The utility model discloses a controllable preload washer, comprising a force-enhancing platform, a load-releasing groove and a deformation platform. An inner hole is arranged in the middle of the washer, wherein the force-enhancing platform and the deformation platform form inner and outer steps, and the deformation platform is higher than the force-enhancing platform, and a load-releasing groove is arranged between the force-enhancing platform and the deformation platform.

[0006] The above-mentioned preload-controllable washer, wherein: the preload-controllable washer can be an inner platform type structure in which the deformation platform is placed inside the force-enhancing platform.

[0007] The above-mentioned preload controllable washer, wherein: the outer diameter of the deformation platform of the inner platform type preload controllable washer is half of the sum of the inner hole diameter and the outer edge diameter of the washer, that is, (inner hole diameter+outer edge diameter)÷2.

[0008] The above-mentioned preload-controllable washer, wherein: the preload-controllable washer can be an outer platform-type structure in which the deformation platform is placed outside the force-boosting platform.

[0009] The above-mentioned preload controllable washer, wherein: the inner diameter of the deformation platform of the outer platform type preload controllable washer is half of the sum of the inner hole diameter and the outer edge diameter of the washer, that is, (inner hole diameter+outer edge diameter)÷2.

[0010] The above-mentioned preload controllable washer, wherein: the diameter of the inner hole is 0.1mm-0.5mm larger than the diameter of the fitting point between the bolt and the washer.

[0011] The above-mentioned preload controllable washer, wherein: the force-enhancing platform is an annular raised platform, and its height is set to 0.1-0.2 times the inner hole diameter.

[0012] The above-mentioned preload controllable gasket, wherein: the deformation platform is an annular bearing platform, and its height is determined by the required maximum tightening preload, which is calculated based on the deformation platform area and the material elastic modulus.

[0013] The above-mentioned preload controllable gasket, wherein: the unloading groove is a smooth annular groove with one side tangent to the deformation platform, and the width of the unloading groove is 0.1-0.2 times the thickness of the gasket.

[0014] The above-mentioned preload controllable washer, wherein: the outer diameter of the preload controllable washer is 1.1-1.2 times the maximum projected diameter of the supporting surface of the bolt.

[0015] Compared with the prior art, the utility model has obvious advantages and beneficial effects. It can be seen from the above technical scheme that in the preload-controllable washer of the utility model, the force-boosting platform and the deformation platform form inner and outer steps, and the deformation platform is higher than the force-boosting platform, and a unloading groove is arranged between the force-boosting platform and the deformation platform. The preload-controllable washer can be an inner platform-type structure in which the deformation platform is placed inside the force-boosting platform or an outer platform-type structure in which the deformation platform is placed outside the force-boosting platform. The utility model uses the contact surface mutation principle to design the corresponding preload-controllable washer, and judges whether the preload is within the required range by causing obvious sudden changes in torque or changes in the washer gap due to sudden changes in the bearing area, thereby achieving the purpose of preload control. The material of the deformation platform part can be the same or different from that of other parts according to actual needs. The hardness of the deformation platform should not be higher than that of the force-boosting platform, and the height difference between the deformation platform and the force-boosting platform is determined according to the maximum allowable preload requirement. In short, the utility model has a simple structure, convenient operation, and reliable use, and is suitable for the promotion and use of controllable preload washers. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the inner platform type preload controllable washer in the utility model;

[0017] Figure 2 for Figure 1 Right view of;

[0018] Figure 3 It is a structural schematic diagram of the Chinese and foreign platform type preload controllable washer of the utility model;

[0019] Figure 4 for Figure 3 Right view of;

[0020] Figure 5 This is a diagram of the installation (start) of the inner platform type preload controllable washer;

[0021] Figure 6This is a diagram of the use status of the external platform type preload controllable washer during installation (starting);

[0022] Figure 7 This is a diagram of the installed (completed) usage status of the preload controllable washer.

[0023] Markings in the figure:

[0024] 1. Force amplification platform; 2. Unloading groove; 3. Deformation platform; 4. Inner hole; 5. Nut; 6. Interlayer; 7. Bolt. DETAILED DESCRIPTION

[0025] The specific implementation manner, structure, features and functions of the controllable preload force washer proposed according to the utility model are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0026] See also Figures 1 to 4 The controllable preload washer of the utility model comprises a force booster 1, a load relief groove 2, a deformation platform 3, and an inner hole 4 is arranged in the middle of the washer. The characteristics are as follows: the force booster 1 and the deformation platform 3 form inner and outer steps, and the deformation platform 3 is higher than the force booster 1, and a load relief groove 2 is arranged between the force booster 1 and the deformation platform 3. The controllable preload washer can be an inner platform structure in which the deformation platform 3 is placed inside the force booster 1. The outer diameter of the deformation platform 3 of the inner platform type controllable preload washer is half of the sum of the inner hole diameter and the outer edge diameter of the washer, that is, the inner hole diameter + the outer edge diameter ÷ 2. The controllable preload washer can be an outer platform structure in which the deformation platform 3 is placed outside the force booster 1. The inner diameter of the deformation platform 3 of the outer platform type controllable preload washer is half of the sum of the inner hole diameter and the outer edge diameter of the washer, that is, the inner hole diameter + the outer edge diameter ÷ 2. The diameter of the inner hole 4 is 0.1mm-0.5mm larger than the diameter of the bolt and the washer at the joint. The force booster 1 is an annular raised platform, and its height is set to 0.1-0.2 times the diameter of the inner hole 4. The deformation platform 3 is an annular bearing platform, and its height is determined by the required maximum tightening preload, which is calculated based on the deformation platform area and the material elastic modulus. The unloading groove 2 is a smooth annular groove with one side tangent to the deformation platform 3, and the width of the unloading groove 2 is 0.1-0.2 times the thickness of the gasket. The outer diameter of the preload controllable gasket is 1.1-1.2 times the maximum projection diameter of the bearing surface of the bolt.

[0027] Example 1: Use an inner platform type preload controllable washer for use with an M6 hexagonal head bolt 7. The width of the hexagonal side of the head is 10mm, and the diagonal width is 10.9mm. At this time, the outer diameter of the preload controllable washer is set to 12mm, the inner hole is 6.2mm, the outer diameter of the deformation platform 3 is 9mm, and the height of the force booster platform 1 is set to 0.8mm. The calculated height of the deformation platform 3 is 0.2mm, the thickness of the preload controllable washer is 1mm, and the width of the unloading groove 2 is 0.15mm.

[0028] Example 2: Use an outer platform type preload controllable washer for use with an M8 hexagonal head bolt 7. The width of the hexagonal side of the head is 13mm, and the diagonal width is 14.3mm. At this time, the outer edge diameter of the preload controllable washer is set to 16mm, the inner hole is 8.2mm, the outer diameter of the deformation platform 3 is 12mm, and the height of the force booster platform 1 is set to 1.5mm. The calculated height of the deformation platform 3 is 0.3mm, the thickness of the preload controllable washer is 1.8mm, and the width of the unloading groove 2 is 0.25mm.

[0029] When using, see Figures 5 to 7 The deformation platform 3 is deformed under the action of the preload. With the increase of the preload, when the deformation platform 3 is flush with the surface of the force-enhancing platform 1, there is no obvious gap, and the wrenching torque suddenly increases, warning that the preload has reached the upper limit of the control, and stopping the application of the preload to achieve the purpose of controlling the maximum preload. The utility model has a simple structure, convenient operation, and reliable use, and is suitable for the promotion and use of gaskets with controllable preload.

[0030] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A preload controllable washer, comprising a force amplification platform (1), a load relief groove (2), a deformation platform (3), an inner hole (4) being arranged in the middle of the washer, characterized in that: The boosting platform (1) and the deformation platform (3) form inner and outer steps, and the deformation platform (3) is higher than the boosting platform (1), and a load-releasing groove (2) is provided between the boosting platform (1) and the deformation platform (3).

2. The preload controllable washer according to claim 1, characterized in that: The preload controllable washer may be an inner platform type structure in which the deformation platform (3) is placed inside the force amplification platform (1).

3. The preload controllable washer according to claim 2, characterized in that: The outer diameter of the deformation platform (3) of the inner platform type preload controllable washer is half of the sum of the inner hole diameter and the outer edge diameter of the washer, that is, (inner hole diameter+outer edge diameter)÷2.

4. The preload controllable washer according to claim 1, characterized in that: The preload controllable washer may be an external platform type structure in which the deformation platform (3) is placed outside the force amplification platform (1).

5. The preload controllable washer according to claim 4, characterized in that: The inner diameter of the deformation platform (3) of the outer platform type preload controllable washer is half of the sum of the inner hole diameter and the outer edge diameter of the washer, that is, (inner hole diameter+outer edge diameter)÷2.

6. The preload controllable washer according to claim 1, characterized in that: The diameter of the inner hole (4) is 0.1 mm to 0.5 mm larger than the diameter of the fitting point between the bolt and the washer.

7. The preload controllable washer according to claim 1, characterized in that: The force-enhancing platform (1) is an annular raised platform, and its height is set to be 0.1-0.2 times the diameter of the inner hole (4).

8. The preload controllable washer according to claim 1, characterized in that: The deformation platform (3) is an annular bearing platform, and its height is determined by the required maximum tightening pre-tightening force, which is calculated based on the deformation platform area and the material elastic modulus.

9. The preload controllable washer according to claim 1, characterized in that: The unloading groove (2) is a smooth annular groove with one side tangent to the deformation platform (3), and the width of the unloading groove (2) is 0.1-0.2 times the thickness of the gasket.

10. The preload controllable washer according to claim 1, characterized in that: The outer diameter of the preload controllable washer is 1.1-1.2 times the maximum projection diameter of the support surface of the bolt.

Images