A friction type one-way damper

Abstract

The present invention relates to the field of electric struts for automobile tailgates, and specifically to a friction-type one-way damper, comprising an output shaft, a housing, a large C-shaped elastic retaining spring, a rotating wheel, a small C-shaped elastic retaining spring, an input shaft, a gasket, and a fastener. The input shaft has a C-shaped structure. The end of the small C-shaped elastic retaining spring forms a hook, the inner diameter of which is fitted onto the input shaft, and the hook is clamped into the opening of the C-shaped structure. The output shaft has an "X"-shaped protrusion, which is fitted onto the inside of the input shaft. The "X"-shaped protrusion is located within the opening of the C-shaped structure and is also located between the hooks of the small C-shaped elastic retaining spring; the rotating wheel is fitted onto the outside of the small C-shaped elastic retaining spring; the inner diameter of the large C-shaped elastic retaining spring is fitted onto the rotating wheel, and the outer diameter is clamped onto the inner wall of the housing by tensioning force. The fastener and the gasket connect the input shaft and the output shaft via a through hole on the output shaft. The present invention avoids the increase in motor power demand caused by the addition of a damper, avoids energy waste, reduces product costs, and improves the market competitiveness of the product.

Description

Technical Field

[0001] The invention relates to the field of electric support rods for automobile tailgates, and in particular to a friction-type one-way damper. Background Art

[0002] With the rapid development of automotive technology, more and more automotive technologies are moving towards electrification and intelligence. Therefore, in this context, most car tailgates have been upgraded from manual opening and closing doors to electric opening and closing systems, greatly improving the customer experience. However, the electric tailgate systems currently on the market are still driven by electric struts. Electric struts mainly consist of components such as motors, reduction gears, dampers, screws, and springs. The motor power passes through the reduction gears and dampers to drive the screw to rotate. The screw converts the rotational motion into linear motion to drive the door opening and closing. Currently, customers generally require that the car tailgate can stop at any position during the movement and remain in that position stably. In order to enable the car tailgate to descend and remain in that position stably at any position during the opening and closing process, the strut itself needs to have a certain system resistance. Therefore, people often add a damper inside the strut to increase the system resistance so that the car tailgate can hover better.

[0003] There are two directions of transmission of driving force during the operation of the electric strut: the first is forward transmission: motor → reduction gearbox → damper → screw → tailgate (in this process, the driving force is input from the input shaft of the damper and output from the output shaft), which is called "forward drive" for the damper;

[0004] The second reverse transmission: tailgate → screw → damper → reduction gearbox → motor (in this process, the driving force is input from the output shaft of the damper and output from the input shaft), which is called "reverse drive" for the damper;

[0005] In order to make the tailgate hover better, we actually only need to increase the system resistance during the "reverse drive" process of the damper, and no resistance is required during the "forward drive" process.

[0006] Currently, all dampers on the market are bidirectional dampers, that is, the damper provides resistance during both "forward drive" and "reverse drive". This has a big disadvantage: the damper also provides resistance during "forward drive", so the motor will consume a large part of the motor power to overcome the friction work of the damper, resulting in a large amount of energy waste. In order to meet the power requirements of the system, we will use a larger power motor, which increases the cost of the product and reduces market competitiveness. Summary of the Invention

[0007] The present invention aims to provide a friction-type one-way damper to overcome the serious energy waste, high product cost, and lack of competitiveness of bidirectional dampers. The friction-type one-way damper of the present invention only provides resistance during reverse drive and does not generate resistance during forward drive. The friction-type one-way damper provided by the present invention is characterized by including an input shaft, a C-shaped elastic small retaining spring, an output shaft, a rotating wheel, a housing, a gasket, and a fastener;

[0008] The input shaft has an input shaft C-shaped structure; the end of the C-shaped elastic small circlip forms a small circlip hook; the inner diameter of the C-shaped elastic small circlip is sleeved on the input shaft C-shaped structure, and the small circlip hook is clamped in the opening of the input shaft C-shaped structure;

[0009] The output shaft has an "X"-shaped protrusion; the output shaft is axially sleeved inside the input shaft, the "X"-shaped protrusion is located in the opening of the C-shaped structure of the input shaft and is also located between the hooks of the small circlip; the output shaft has an output shaft flange surface on the top, and the output shaft flange surface limits the axial movement of the input shaft and the C-shaped elastic small circlip;

[0010] The runner is sleeved on the outside of the C-shaped elastic small circlip, and the outer diameter of the C-shaped elastic small circlip is fixed to the inner wall of the runner under the action of tension; the runner is connected to the housing through a damping; the upper end surface of the runner has a runner flange surface, and the runner flange surface limits the axial movement of the C-shaped elastic small circlip;

[0011] The output shaft has a through hole; the fastener and the gasket connect the input shaft and the output shaft through the through hole;

[0012] A circle of circular table surfaces is provided in the middle of the shell.

[0013] Furthermore, the through hole is a threaded hole or a smooth hole.

[0014] Furthermore, the output shaft is made of powder metallurgy material.

[0015] Furthermore, the input shaft, the runner and the housing are made of zinc alloy material.

[0016] Furthermore, the C-shaped elastic small retaining springs are grouped into 4 to 5 pieces.

[0017] Furthermore, the X-shaped protrusion has a large rounded corner feature.

[0018] Furthermore, a large elastic retaining spring is provided; the large elastic retaining spring is clamped to the inner wall of the housing by its own tensioning force; and the output shaft flange surface also limits the axial movement of the large elastic retaining spring.

[0019] Furthermore, the large elastic retaining spring is a C-shaped large elastic retaining spring.

[0020] Furthermore, a large retaining spring hook is formed at the end of the C-shaped elastic large retaining spring; a groove structure is formed on the rotating wheel; and the large retaining spring hook structure is clamped in the groove structure.

[0021] Furthermore, the elastic large retaining springs are grouped into 4 to 5 pieces.

[0022] The friction-type one-way damper of the present invention extracts the path of driving force transmission according to the transmission direction of the driving force during the use of the electric strut: one is forward drive and the other is reverse drive. Resistance is provided during reverse drive, while no resistance is provided during forward drive, thereby avoiding energy waste caused by the motor needing to overcome the resistance of the damper to perform work during the forward drive process where no resistance is required. However, it also ensures that sufficient resistance is provided during the reverse drive to meet the needs of the electric strut. On the other hand, since there is no need to overcome additional resistance to perform work during the forward drive process, a smaller power motor can be selected for the electric strut product, which is cheaper, thereby reducing product costs and improving the market competitiveness of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a 3D assembly schematic diagram of a preferred embodiment of the present invention;

[0024] Figure 2 is an axial cross-sectional view of a preferred embodiment of the present invention;

[0025] Figure 3 is a radial cross-sectional view of a preferred embodiment of the present invention;

[0026] Figure 4 is a 3D view of the input shaft of a preferred embodiment of the present invention;

[0027] Figure 5 It is a 3D view of the output shaft of a preferred embodiment of the present invention.

[0028] Among them, 1-output shaft, 2-housing, 3-C-type elastic large circlip, 4-rotor, 5-C-type elastic small circlip, 6-input shaft, 7-gasket, 8-fastener;

[0029] 11-X-shaped protrusion, 31-large circlip hook, 51-small circlip hook, 61-input shaft C-type structure, 12-output shaft flange surface, 41-groove, 42-wheel flange surface. DETAILED DESCRIPTION

[0030] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0031] Example 1:

[0032] See also Figure 1 A friction-type one-way damper of this embodiment includes an output shaft 1, a housing 2, a C-type elastic large retaining spring 3, a rotating wheel 4, a C-type elastic small retaining spring 5, an input shaft 6, a gasket 7 and a fastener 8.

[0033] The output shaft 1 has a "X" shaped protrusion 11 and also has a threaded hole or a smooth hole structure. The input shaft 6 and the output shaft 1 are connected together by fasteners 8 and gaskets 7 using the threaded hole or smooth hole structure to transmit power.

[0034] The C-shaped elastic circlip 3 has a hook feature, namely the large circlip hook 31. After installation, the large circlip hook 31 is located in the groove 41 on the rotating wheel 4, preventing relative rotation between the C-shaped elastic circlip 3 and the rotating wheel 4. The inner diameter of the C-shaped elastic circlip 3 fits over the outer diameter of the rotating wheel 4. The outer diameter of the C-shaped elastic circlip 3 is fixed to the inner wall of the housing 2 through tension, generating friction through relative movement with the inner wall of the housing 2. The C-shaped elastic circlip 3 rotates as the rotating wheel 4 rotates. The C-shaped elastic circlip 3 consists of four to five pieces.

[0035] The C-shaped elastic circlip 5 features a hooked feature, known as the hook 51. After installation, the hook 51 sits within the opening of the input shaft's C-shaped structure 61, preventing relative rotation between the C-shaped circlip 5 and the input shaft 6. The inner diameter of the C-shaped circlip 5 fits over the outer diameter of the input shaft 6. The outer diameter of the C-shaped circlip 5 is mounted on the inner wall of the runner 4. It is secured to the inner wall of the runner 4 under slight tension and rotates with the rotation of the input shaft 6 and output shaft 1. The C-shaped circlip 5 is assembled in sets of four to five pieces.

[0036] The output shaft 1 is made of powder metallurgy material. The housing 2, the runner 4 and the input shaft 6 are made of zinc alloy material.

[0037] See also Figure 2 The output shaft 1 of a friction-type one-way damper of this embodiment has an output shaft flange surface 12, which can limit the axial movement of the input shaft 6 and the C-shaped elastic small retaining spring 5; the upper end surface of the runner 4 also has a runner flange surface 42, which can limit the axial movement of the C-shaped elastic large retaining spring 3 and the C-shaped elastic small retaining spring 5.

[0038] There is a circular table in the middle of the housing 2. Fasteners 8 and gaskets 7 use a through-hole structure to connect the output shaft 1 and the input shaft 6. The input shaft 6 and the output shaft 1 can rotate relative to each other.

[0039] See also Figure 3In the present embodiment, the side surface of the input shaft C-shaped structure 61 of the input shaft 6 of a friction-type one-way damper pushes the small retaining spring hook 51 of the C-shaped elastic small retaining spring 5, and the small retaining spring hook 51 of the C-shaped elastic small retaining spring 5 then pushes the "X"-shaped protrusion 11 of the output shaft 1, thereby driving the rotation of the output shaft 1. Due to the shape of the contact surface, in the process of the input shaft C-shaped structure 61 of the input shaft 6 pushing the small retaining spring hook 51 of the C-shaped elastic small retaining spring 5, the thrust will force the C-shaped elastic small retaining spring 5 to shrink toward the center, so the C-shaped elastic small retaining spring 5 will slightly detach from the inner wall of the runner 4. At this time, there will be no frictional force transmitted between the C-shaped elastic small retaining spring 5 and the inner wall of the runner 4, the runner 4 and the C-shaped large retaining spring 3 will not rotate, and the damper will not have frictional resistance.

[0040] During reverse driving, the driving force is transmitted from the output shaft 1 and transmitted from the input shaft 6, that is, the output shaft 1 drives the input shaft 6 to rotate. The specific driving method is: the arc of the side of the "X"-shaped protrusion 11 of the output shaft 1 pushes the small retaining spring hook 51 of the C-shaped small retaining spring 5, and the small retaining spring hook 51 of the C-shaped small retaining spring 5 pushes the side of the input shaft C-shaped structure 61 of the input shaft 6, thereby driving the rotation of the input shaft 6. Due to the shape of the contact surface, in the process of the side of the "X"-shaped feature 11 of the output shaft 1 pushing the small retaining spring hook 51 of the C-shaped elastic small retaining spring 5, the thrust will The C-shaped elastic small retaining spring 5 is forced to deform outward, so the outer surface of the C-shaped elastic small retaining spring 5 will squeeze the inner wall of the rotating wheel 4. At this time, there is a lot of pressure between the C-shaped elastic small retaining spring 5 and the inner wall of the rotating wheel 4, and a sufficiently large static friction force will be generated during the movement, resulting in the C-shaped elastic small retaining spring 5 and the rotating wheel 4 being unable to produce relative movement. At this time, the C-shaped elastic small retaining spring 5 will drive the rotating wheel 4 to rotate, and the rotation of the rotating wheel 4 will drive the C-shaped elastic large retaining spring 3 to rotate, thereby causing relative rotation between the C-shaped elastic large retaining spring 3 and the inner wall of the shell 2 to generate friction resistance.

[0041] The large circlip hook 31 is located in a groove 41 on the rotating wheel 4 to prevent the C-shaped elastic large circlip 3 and the rotating wheel 4 from rotating relative to each other.

[0042] See also Figure 4 In this embodiment, an output shaft 1 of a friction-type one-way damper has an X-shaped protrusion 11.

[0043] See also Figure 5 In this embodiment, the input shaft 6 of a friction-type one-way damper has an input shaft C-shaped structure 61 .

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. That is, any equivalent changes and modifications made according to the content of the patent application of the present invention should fall within the technical scope of the present invention.

Claims

1. A friction type one-way damper, characterized in that: It includes an input shaft, a C-shaped elastic small circlip, an output shaft, a runner, a housing, a gasket and fasteners; The input shaft has an input shaft C-shaped structure; the end of the C-shaped elastic small circlip forms a small circlip hook; the inner diameter of the C-shaped elastic small circlip is sleeved on the input shaft C-shaped structure, and the small circlip hook is clamped in the opening of the input shaft C-shaped structure; the C-shaped elastic small circlips are grouped into 4 to 5 pieces; It also has a large elastic circlip; the large elastic circlip is clamped to the inner wall of the housing by its own tensioning force; the output shaft flange surface also limits the axial movement of the large elastic circlip; the large elastic circlip is a C-shaped large elastic circlip; the large elastic circlip is grouped into 4 to 5 pieces; The output shaft has an "X"-shaped protrusion; the output shaft is axially sleeved inside the input shaft, the "X"-shaped protrusion is located in the opening of the C-shaped structure of the input shaft and is also located between the hooks of the small circlip; the output shaft has an output shaft flange surface on the top, and the output shaft flange surface limits the axial movement of the input shaft and the C-shaped elastic small circlip; The runner is sleeved on the outside of the C-shaped elastic small circlip, and the outer diameter of the C-shaped elastic small circlip is fixed to the inner wall of the runner under the action of tension; the runner is connected to the housing through a damping; the upper end surface of the runner has a runner flange surface, and the runner flange surface limits the axial movement of the C-shaped elastic small circlip; The output shaft has a through hole; the fastener and the gasket connect the input shaft and the output shaft through the through hole; A circle of circular table surfaces is provided in the middle of the shell.

2. The one-way damper according to claim 1, characterized in that The through hole is a threaded hole or a smooth hole.

3. The one-way damper according to claim 1, characterized in that The output shaft is made of powder metallurgy material.

4. The one-way damper according to claim 1, characterized in that The input shaft, the rotating wheel and the housing are made of zinc alloy material.

5. The one-way damper according to claim 1, characterized in that The "X"-shaped protrusion has a large rounded corner feature.

6. The one-way damper according to claim 1, wherein: The end of the C-shaped elastic large retaining spring forms a large retaining spring hook; a groove structure is formed on the rotating wheel; and the large retaining spring hook structure is clamped in the groove structure.

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