Rotary damper

Abstract

The rotary damper is applied to the field of damping and comprises a shell sleeve, a damping bush is arranged on the inner edge of the shell sleeve, a taper hole is formed in the damping bush, an output shaft matched with the taper hole is rotationally connected into the taper hole, an elastic piece is arranged on the inner edge of the shell sleeve, and the elastic piece is arranged on the inner edge of the shell sleeve. The output shaft penetrates through the elastic piece and is connected with an external power source, and the elastic piece abuts against the position between the output shaft and the damping bush. The damping device has the technical effects that an external power source is started to drive the output shaft to rotate on the inner edge of the taper hole of the damping bush, the elastic piece abuts against the position between the output shaft and the damping bush, when a gap is generated between the output shaft and the damping bush after the specific cycle number, the elastic piece in the compressed state exerts acting force on the output shaft, and the output shaft is driven to rotate. The output shaft is pushed to move towards the direction of the elastic piece along the taper hole, so that the output shaft and the damping bush are still tightly attached, the generated abrasion clearance is compensated, the damping value attenuation proportion is small, and the operation stability and reliability are improved.

Description

Technical Field

[0001] This application relates to the technical field of damping, and particularly to a rotary damper. Background Art

[0002] In the joint module of a motion mechanism, dampers are widely used to buffer vibrations, impacts, etc. under different working conditions, improve the stability of the motion mechanism, and facilitate providing a stable and smooth rotational motion for the motion mechanism.

[0003] Existing dampers usually adopt solid friction plate dampers. A solid friction plate damper is a damping device designed based on the friction principle. Frictional force is generated through the relative movement between two or more solid friction materials, thereby consuming vibration energy and achieving the purpose of shock absorption.

[0004] The above-mentioned solid friction plate damper has a large fluctuation in damping value affected by temperature. After long-term frequent wear between the friction plates, gaps are likely to occur, resulting in a decline in damping effect and affecting the stability of the motion mechanism during operation. Summary of the Invention

[0005] In order to help solve the problem that gaps are likely to occur after long-term frequent wear of the above damper and the damping effect decreases, a rotary damper provided by this application adopts the following technical solution: It includes a housing sleeve. A damping bushing is provided on the inner edge of the housing sleeve. A tapered hole is formed in the damping bushing. An output shaft matching the tapered hole is rotatably connected in the tapered hole. An elastic member is provided on the inner edge of the housing sleeve. The output shaft passes through the elastic member and is connected to an external power source. The elastic member is pressed between the output shaft and the damping bushing.

[0006] Through the above technical solution, when the external power source is started to drive the output shaft to rotate on the inner edge of the tapered hole of the damping bushing, and the elastic member is pressed between the output shaft and the damping bushing. When a gap is generated between the output shaft and the damping bushing after a specific number of cycles, the elastic member in the compressed state applies a force to the output shaft, pushing the output shaft to move along the tapered hole towards the elastic member direction, so that the output shaft and the damping bushing still fit tightly, compensating for the generated wear gap, with a small attenuation ratio of the damping value, and improving the operation stability and reliability.

[0007] In a specific feasible implementation, a shoulder is provided on the inner edge of the housing sleeve, and the shoulder is pressed between the elastic member and the damping bushing.

[0008] Through the above technical solution, the shoulder plays a supporting role for the elastic member, improving the stability of the placement of the elastic member. At the same time, the elastic member and the damping bushing are separated by the shoulder, reducing the possibility of mutual interference between the two.

[0009] In a specific feasible implementation scheme, a mounting groove is provided on the inner edge of the shell sleeve, and a switching flange is connected to the end of the output shaft facing the mounting groove. The switching flange is located in the mounting groove, and the end of the switching flange facing away from the damping bushing is connected to an external power source, and the elastic member is tightly pressed between the switching flange and the shell shoulder.

[0010] Through the above technical solution, the adapter flange, as a connecting piece between the output shaft and the external power source, plays a key role in transmitting power and torque. The adapter flange can smoothly transmit the power of the external power source to the output shaft, thereby driving the external equipment connected to the output shaft to operate, and realizing efficient and stable transmission of power from the external power source to the output shaft.

[0011] In a specific possible implementation manner, the adapter flange is provided with mounting bolts, a bolt groove is provided on the surface of the output shaft facing the adapter flange, and the mounting bolt is threadedly connected in the bolt groove.

[0012] Through the above technical solution, the operator can remove the adapter flange from the output shaft by means of bolt disassembly, thereby realizing a detachable connection between the adapter flange and the output shaft, which is more flexible.

[0013] In a specific possible implementation manner, a gasket is sleeved on the outer edge of the adapter flange, and the gasket is tightly pressed between the adapter flange and the elastic member.

[0014] Through the above technical solution, the gasket is used to separate the adapter flange from the elastic member, thereby reducing the possibility of interference between the two and reducing the friction loss between the adapter flange and the elastic member.

[0015] In a specific implementation manner, the elastic member is a wave spring.

[0016] Through the above technical solution, the wave spring has a unique wavy structure, which can distribute stress more evenly when subjected to force, thereby improving its fatigue resistance. Compared with traditional linear springs, the wave spring has reduced axial end clearance and has a longer service life and better stability.

[0017] In a specific possible implementation scheme, a limiting block is provided on the outer edge of the damping bushing, a limiting groove matching the limiting block is opened on the inner edge of the shell sleeve, and the limiting block is inserted into the limiting groove.

[0018] Through the above technical solution, the limiting block is inserted into the limiting groove, which reduces the possibility of relative rotation between the damping bushing and the shell sleeve, and improves the stability of the connection between the damping block and the shell sleeve.

[0019] In a specific possible implementation manner, the friction angle between the damping bushing and the output shaft is smaller than 1 / 2 of the cone angle of the tapered hole.

[0020] In a specific feasible implementation, a connecting shaft is provided at one end of the output shaft facing away from the elastic member, and the connecting shaft extends out of the housing sleeve.

[0021] Through the above technical solution, the connecting shaft can be connected to an external device. When the output shaft rotates, it drives the connecting shaft to rotate synchronously, thereby driving the external device to rotate.

[0022] In a specific feasible implementation, a connecting groove is provided at one end of the connecting shaft facing away from the output shaft.

[0023] Through the above technical solution, the connecting groove facilitates the connection between the connecting shaft and the external device, and improves the stability when the output shaft is connected to the external device.

[0024] In summary, the present application has at least the following beneficial technical effects: Starting the external power source drives the output shaft to rotate on the inner edge of the conical hole of the damping bushing. The elastic member is pressed tightly between the output shaft and the damping bushing. When a gap is generated between the output shaft and the damping bushing after a specific number of cycles, the elastic member in the compressed state exerts a force on the output shaft, pushing the output shaft to move along the conical hole towards the direction of the elastic member, so that the output shaft and the damping bushing still fit tightly, compensating for the generated wear gap, with a small attenuation ratio of the damping value, and improving the operation stability and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present application.

[0026] Figure 2 is a schematic sectional view for showing the housing shoulder in an embodiment of the present application.

[0027] Reference numerals: 1, housing sleeve; 2, damping bushing; 3, conical hole; 4, output shaft; 5, elastic member; 6, housing shoulder; 7, mounting groove; 8, adapter flange; 9, mounting bolt; 10, gasket; 11, limiting block; 12, limiting groove; 13, connecting shaft; 14, connecting groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following Figure 1-2 further describes the present application in detail.

[0029] An embodiment of the present application discloses a rotary damper.

[0030] Referring to Figure 1 and Figure 2The rotary damper includes a shell 1, the inner edge of which is fixedly connected with an annular shell shoulder 6, the inner edge of which is provided with a damping bushing 2, the outer edge of which is fixedly connected with a limiting block 11, the inner edge of which is provided with a limiting groove 12 matching the size of the limiting block 11, and the limiting block 11 is inserted into the limiting groove 12. In the embodiment of the present application, the number of limiting blocks 11 can be set to four, and the four limiting blocks 11 are evenly distributed in an array along the outer edge of the damping bushing 2. By inserting the limiting blocks 11 into the limiting grooves 12, the possibility of relative rotation between the damping bushing 2 and the shell 1 is reduced, and the stability of the connection between the damping block and the shell 1 is improved. In the embodiment of the present application, the damping bushing 2 can be processed with the shell 1 by integral injection molding.

[0031] Reference Figure 1 and Figure 2 An elastic member 5 is provided on the inner edge of the shell 1, and a shell shoulder 6 is pressed tightly between the elastic member 5 and the damping bushing 2. The shell shoulder 6 supports the elastic member 5, thereby improving the stability of the placement of the elastic member 5. At the same time, the shell shoulder 6 is used to separate the elastic member 5 from the damping bushing 2, thereby reducing the possibility of mutual interference between the two.

[0032] Reference Figure 1 and Figure 2 A tapered hole 3 is provided on the damping bushing 2, and an output shaft 4 matching the size of the tapered hole 3 is rotatably connected in the tapered hole 3. In the embodiment of the present application, the friction angle between the damping bushing 2 and the output shaft 4 is smaller than 1 / 2 of the tapered angle of the tapered hole 3, thereby reducing the possibility of the damping bushing 2 and the output shaft 4 getting stuck or even stuck, and facilitating the smooth rotation of the output shaft 4 on the inner edge of the tapered hole 3.

[0033] Reference Figure 1 and Figure 2 A mounting groove 7 is provided on the inner edge of the shell 1, and a transfer flange 8 is connected to one end of the output shaft 4 facing the mounting groove 7. The transfer flange 8 is located in the mounting groove 7, and the transfer flange 8 passes through the elastic member 5. The end of the transfer flange 8 facing away from the damping bushing 2 is connected to the external power source, and the elastic member 5 is pressed tightly between the transfer flange 8 and the shell shoulder 6.

[0034] Therefore, the adapter flange 8, as a connecting piece between the output shaft 4 and the external power source, plays a key role in transmitting power and torque. The adapter flange 8 can smoothly transmit the power of the external power source to the output shaft 4, thereby driving the external equipment connected to the output shaft 4 to operate, and realizing efficient and stable transmission of power from the external power source to the output shaft 4.

[0035] Reference Figure 1 and Figure 2, the adapter flange 8 is provided with mounting bolts 9, and a bolt groove is provided on the surface of the output shaft 4 facing the adapter flange 8, and the mounting bolts 9 are threadedly connected in the bolt groove. The operator can remove the adapter flange 8 from the output shaft 4 by disassembling the bolts, thereby realizing a detachable connection between the adapter flange 8 and the output shaft 4, which is more flexible. In the embodiment of the present application, the end of the mounting bolt 9 is located in the adapter flange 8 as a whole, which reduces the possibility of interference between the mounting bolt 9 and the external power source when the adapter flange 8 is connected to the external power source, and at the same time saves the axial space occupied by the adapter flange 8, thereby improving the space utilization rate.

[0036] Reference Figure 1 and Figure 2 The outer edge of the adapter flange 8 is sleeved with an annular gasket 10, which is tightly pressed between the adapter flange 8 and the elastic member 5. The adapter flange 8 and the elastic member 5 are separated by the gasket 10, which reduces the possibility of interference between the two and reduces the friction loss between the adapter flange 8 and the elastic member 5. In the embodiment of the present application, the gasket 10 and the damping bushing 2 can both be made of self-lubricating and friction-resistant materials, such as polyoxymethylene (POM) plastic.

[0037] Reference Figure 1 and Figure 2 The end of the output shaft 4 away from the elastic member 5 is fixedly connected with a connecting shaft 13, and the connecting shaft 13 extends out of the shell 1. The end of the connecting shaft 13 away from the output shaft 4 is provided with a connecting groove 14. The connecting shaft 13 can be connected to an external device through the connecting groove 14. When the output shaft 4 rotates, it drives the connecting shaft 13 to rotate synchronously, thereby driving the external device to rotate, which plays a role in transmitting power and torque, and improves the stability of the output shaft 4 when connected to the external device.

[0038] Reference Figure 1 and Figure 2 The elastic member 5 is a wave spring. The wave spring has a unique wave structure and can distribute stress more evenly when subjected to force, thereby improving its fatigue resistance. Compared with traditional linear springs, the wave spring has reduced axial end clearance and has a longer service life and better stability.

[0039] Taking the automotive industry as an example, the operating temperature range is generally -40℃-90℃, and the damping material and the shaft material will inevitably have a large range of thermal expansion and contraction. The rotary damper in the embodiment of the present application has good damping value adaptation under high and low temperature conditions:

[0040] When the rotary damper is in the low-temperature shrinkage condition, the inner and outer circular surfaces of the damping bushing 2 shrink, and the inner surface of the housing sleeve 1 shrinks. At this time, the conventional damper mechanism is prone to jamming. However, for the rotary damper of the embodiment of the present application, relying on the wave spring, the output shaft 4 can drive the adapter flange 8 to move along the tapered hole 3 towards the output end of the output shaft 4, thereby compressing the wave spring, only increasing the damping value, and the output shaft 4 can still output power to the external device without affecting the overall operation of the system. Similarly, when the rotary damper is in the high-temperature expansion condition, the inner and outer circular surfaces of the damping bushing 2 expand, and the inner surface of the housing sleeve 1 expands. The output shaft 4 can drive the adapter flange 8 to move along the tapered hole 3 towards the input end of the output shaft 4, so that the output shaft 4 and the damping bushing 2 are still in close contact, eliminating the movement gap generated under high-temperature conditions, and only the damping value slightly decreases.

[0041] In addition, the rotary damper of the embodiment of the present application can also achieve a large rotary friction torque and realize a wide range of adjustment of the damping value. The specific analysis is as follows:

[0042] According to the calculation formula of the damping value of the damping bushing:

[0043] M = R * F f

[0044] The rotary friction torque is: N = μ * F n * R

[0045] Wherein, F f The calculation formula of: F f = μ * F n ; F n The calculation formula of:

[0046] In the above formula: M is the damping value of the damping bushing; F f is the frictional force between the damping bushing and the output shaft; R is the equivalent radius of the damping bushing; μ is the friction coefficient; F n is the normal pressure of the damping bushing; b is the initial force of the wave spring; α is the 1 / 2 taper angle; N is the rotary friction torque.

[0047] In the embodiment of the present application, relying on the design of the specific taper angle of the tapered hole 3 of the damping bushing 2, a small axial force can provide a large vertical normal pressure between the output shaft 4 and the damping bushing 2, thereby obtaining a large rotary friction torque. Since the bushing damping value is related to the equivalent radius, friction coefficient, taper angle, wave spring model, etc. of the damping bushing 2, the required damping value can be adjusted by adjusting the equivalent radius, friction coefficient, taper angle, wave spring model, and a wide range of damping value adjustment can be achieved.

[0048] The implementation principle of the embodiment of the present application is: starting the external power source drives the output shaft 4 to rotate on the inner edge of the tapered hole 3 of the damping bushing 2, and the elastic member 5 is pressed tightly between the adapter flange 8 and the shell shoulder 6. After a specific number of cycles, if a gap is generated between the output shaft 4 and the damping bushing 2, the elastic member 5 in the compressed state applies a force to the adapter flange 8. Since the adapter flange 8 is connected to the output shaft 4, the output shaft 4 is pushed to move along the tapered hole 3 toward the elastic member 5, so that the output shaft 4 and the damping bushing 2 are still tightly fitted, compensating for the wear gap, the damping value attenuation ratio is small, the shaking amount of the overall system is reduced, and the operation stability and reliability are improved.

[0049] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A rotary damper, characterized in that: The invention comprises a shell (1), wherein the inner edge of the shell (1) is provided with a damping bushing (2), the damping bushing (2) is provided with a tapered hole (3), an output shaft (4) matching the tapered hole (3) is rotatably connected in the tapered hole (3), an elastic member (5) is provided on the inner edge of the shell (1), the output shaft (4) passes through the elastic member (5) and is connected to an external power source, and the elastic member (5) is tightly pressed between the output shaft (4) and the damping bushing (2).

2. The rotary damper according to claim 1, characterized in that: The inner edge of the shell sleeve (1) is provided with a shell shoulder (6), and the shell shoulder (6) is tightly pressed between the elastic member (5) and the damping bushing (2).

3. The rotary damper according to claim 2, characterized in that: The inner edge of the shell (1) is provided with a mounting groove (7); the end of the output shaft (4) facing the mounting groove (7) is connected with a switching flange (8); the switching flange (8) is located in the mounting groove (7); the end of the switching flange (8) facing away from the damping bushing (2) is connected to an external power source; and the elastic member (5) is tightly pressed between the switching flange (8) and the shell shoulder (6).

4. The rotary damper according to claim 3, characterized in that: The adapter flange (8) is provided with mounting bolts (9), a bolt groove is provided on the surface of the output shaft (4) facing the adapter flange (8), and the mounting bolts (9) are threadedly connected in the bolt groove.

5. The rotary damper according to claim 3, characterized in that: A gasket (10) is sleeved on the outer edge of the adapter flange (8), and the gasket (10) is tightly pressed between the adapter flange (8) and the elastic member (5).

6. The rotary damper according to claim 3, characterized in that: The elastic member (5) is a wave spring.

7. The rotary damper according to claim 1, characterized in that: The outer edge of the damping bushing (2) is provided with a limit block (11), the inner edge of the shell (1) is provided with a limit groove (12) matching the limit block (11), and the limit block (11) is inserted into the limit groove (12).

8. The rotary damper according to claim 1, characterized in that: The friction angle between the damping bushing (2) and the output shaft (4) is smaller than 1 / 2 of the cone angle of the cone hole (3).

9. The rotary damper according to claim 1, characterized in that: A connecting shaft (13) is provided at one end of the output shaft (4) facing away from the elastic member (5), and the connecting shaft (13) extends out of the housing (1).

10. The rotary damper according to claim 9, characterized in that: A connecting groove (14) is formed at one end of the connecting shaft (13) which is away from the output shaft (4).

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