Rotary mechanism with self-locking

Abstract

The present application relates to a kind of self-locking rotary mechanism, driving wheel is arranged on shaft to be driven by driving mechanism, driven wheel is arranged on shaft and is driven by driving wheel, torsional spring includes ring part, first spring arm and second spring arm, ring part is wound on shaft, first spring arm extends radially from the top end of ring part and is clamped between driven wheel and driving wheel, second spring arm extends radially from the bottom end of ring part and is clamped between driven wheel and driving wheel, driving wheel is driven when being positively, act on torsional spring and make it be in the unlocking state, driven wheel is driven when being reversely, act on torsional spring and make it be in the locking state.The self-locking rotary mechanism according to the present application, the self-locking size of independent self-locking structure only needs to adjust the design of torsional spring, without the transmission performance level and self-locking performance binding, so the design of gear transmission system can use higher efficient design.

Description

Technical Field

[0001] This invention relates to automobile seats, and more particularly to a rotating mechanism with a self-locking mechanism. Background Technology

[0002] Many existing electric seat backrests do not have self-locking adjustment mechanisms, and the backrest angle adjusters are not fully self-locking under bumpy conditions.

[0003] Traditional self-locking stages are located within the transmission stage, achieving a certain degree of self-locking by sacrificing efficiency, such as worm gear + helical gear / worm wheel, and planetary transmission with small tooth difference. Summary of the Invention

[0004] To address the issues of efficiency sacrifice required by the self-locking stage in the prior art, this invention provides a rotating mechanism with a self-locking mechanism.

[0005] According to the present invention, a self-locking rotary mechanism includes a driven wheel, a torsion spring, a driving wheel, and a shaft. The driving wheel is sleeved on the shaft and driven in the forward direction by the driving mechanism. The driven wheel is sleeved on the shaft and driven by the driving wheel. The torsion spring includes a coil portion, a first spring arm, and a second spring arm. The coil portion is wound around the shaft. The first spring arm extends radially outward from the top end of the coil portion and is clamped between the driven wheel and the driving wheel. The second spring arm extends radially outward from the bottom end of the coil portion and is clamped between the driven wheel and the driving wheel. When the driving wheel is driven in the forward direction, it acts on the torsion spring to put it in an unlocked state. When the driven wheel is driven in the reverse direction, it acts on the torsion spring to put it in a locked state.

[0006] Preferably, the drive wheel has a first abutting wall. When the drive wheel is driven in the forward direction and rotates counterclockwise, the first abutting wall acts on the first spring arm, so that the winding force of the torsion spring on the shaft remains zero or decreases.

[0007] Preferably, the drive wheel has a second abutment wall spaced apart from the first abutment wall. When the drive wheel is driven in the forward direction to rotate clockwise, the second abutment wall acts on the second spring arm so that the winding force of the torsion spring on the shaft remains zero or decreases.

[0008] Preferably, the driven wheel has a first working wall. When the driven wheel is driven in the opposite direction to rotate counterclockwise, the first working wall acts on the first spring arm, causing the torsion spring to generate a winding force on the shaft or increasing the winding force of the torsion spring on the shaft.

[0009] Preferably, the driven wheel has a second working wall spaced apart from the first working wall. When the driven wheel is driven in the opposite direction to rotate clockwise, the second working wall acts on the second spring arm, causing the torsion spring to generate a winding force on the shaft or increasing the winding force of the torsion spring on the shaft.

[0010] Preferably, the rotating mechanism further includes a wear-resistant bushing that serves as a friction component, sandwiched between the shaft and the ring portion.

[0011] Preferably, the wear-resistant bushing has a rough outer wall acting on the ring portion and a smooth inner wall acting on the shaft.

[0012] Preferably, the rotating mechanism further includes a cover plate and a housing, which are fixedly connected along a first direction by a snap fastener, and the shaft extends along the first direction and is non-rotatably supported on the cover plate and the housing at both ends.

[0013] Preferably, the rotating mechanism further includes an output gear, the two axial ends of which are rotatably supported on the cover plate and the housing, and the output gear meshes with the driven wheel to be driven by the driven wheel.

[0014] Preferably, the rotating mechanism further includes a worm and a motor as a driving mechanism, wherein the motor is fixedly connected to the housing along a second direction perpendicular to the first direction, the worm is mounted on the output shaft of the motor to be driven to rotate by the motor, and the worm meshes with the driving wheel to drive the driving wheel.

[0015] According to the self-locking rotary mechanism of the present invention, when the driving wheel is driven in the forward direction, it acts on the torsion spring to put it in the unlocked state, and when the driven wheel is driven in the reverse direction, it acts on the torsion spring to put it in the locked state. The self-locking property of its independent self-locking structure can be adjusted by simply adjusting the design of the torsion spring. There is no need to tie the transmission performance level and the self-locking property together. Therefore, the design of the gear transmission system can use a more efficient design. Attached Figure Description

[0016] Figure 1 This is an overall assembly drawing of a self-locking rotating mechanism according to a preferred embodiment of the present invention.

[0017] Figure 2 yes Figure 1 Exploded view.

[0018] Figure 3 yes Figure 1 A sectional view.

[0019] Figure 4 yes Figure 2 An assembly diagram of the torsion spring, wear-resistant bushing, and shaft.

[0020] Figure 5 yes Figure 2 A schematic diagram of the assembly of the torsion spring and the drive wheel.

[0021] Figure 6 yes Figure 2 A schematic diagram of the assembly of the torsion spring and the driven wheel. Detailed Implementation

[0022] The preferred embodiments of the present invention are given below with reference to the accompanying drawings and described in detail.

[0023] like Figures 1-3 As shown, a self-locking rotating mechanism according to a preferred embodiment of the present invention includes a cover plate 1 and a housing 8, which are fixedly connected along a first direction by a snap fastener.

[0024] The rotating mechanism also includes a worm gear 9 and a motor 10. The motor 10 is fixedly connected to the housing 8 along a second direction perpendicular to the first direction by two self-tapping screws 11. The worm gear 9 is mounted on the output shaft of the motor 10 so as to be driven to rotate by the motor 10.

[0025] The rotating mechanism also includes a driven wheel 3, a driving wheel 6, and a shaft 7. The shaft 7 extends along a first direction and is non-rotatably supported on the cover plate 1 and the housing 8 at both ends. The driving wheel 6 is sleeved on the shaft 7 and meshes with a worm gear 9 to be driven by the worm gear 9. The driven wheel 3 is sleeved on the shaft 7 and is driven by the driving wheel 6. In this embodiment, the driven wheel 3 is a pinion, and the driving wheel 6 is a helical gear.

[0026] Specifically, the rotating mechanism also includes a torsion spring 4 and a wear-resistant bushing 5, see [link to relevant documentation]. Figure 4 The torsion spring 4 includes an integrally formed ring portion 41, a first spring arm 42, and a second spring arm 43. The ring portion 41 is wound around the wear-resistant bushing 5 and the shaft 7. The first spring arm 42 extends radially outward from the top end of the ring portion 41 and is clamped between the driven wheel 3 and the driving wheel 6. The second spring arm 43 extends radially outward from the bottom end of the ring portion 41 and is clamped between the driven wheel 3 and the driving wheel 6.

[0027] The rotating mechanism also includes an output gear 2, whose two axial ends are rotatably supported on the cover plate 1 and the housing 8, and the output gear 2 meshes with the driven wheel 3 to be driven by the driven wheel 3.

[0028] The operating principle of the self-locking rotary mechanism according to the present invention is briefly described below.

[0029] The output shaft of motor 10 drives worm 9 to rotate, worm 9 drives drive wheel 6 to rotate, drive wheel 6 drives torsion spring 4 to rotate around shaft 7, torsion spring 4 also drives driven wheel 3 and wear-resistant bushing 5 to rotate synchronously, wear-resistant bushing 5 and shaft 7 rotate and slide friction, at the same time driven wheel 3 drives output gear 2 to rotate and output speed and torque.

[0030] The working principle of the torsion spring 4 with self-locking rotating mechanism according to the present invention is briefly described below.

[0031] like Figure 4As shown, when the first spring arm 42 of the torsion spring 4 is subjected to a force in the direction of arrow A, and / or the second spring arm 43 is subjected to a force in the direction of arrow B, the torsion spring 4 tends to open and loosen, and the winding force of the torsion spring 4 on the wear-resistant bushing 5 or the shaft 7 becomes smaller. If it rotates at this time, the torque will also decrease accordingly.

[0032] Conversely, when the first spring arm 42 of the torsion spring 4 is subjected to a force in the direction of arrow C, and / or the second spring arm 43 is subjected to a force in the direction of arrow D, the torsion spring 4 tends to tighten its winding. The winding force of the torsion spring 4 on the wear-resistant bushing 5 or the shaft 7 increases. If it rotates at this time, the torque will also increase accordingly. The outer wall of the wear-resistant bushing 5 is rougher than its inner wall. When subjected to torque for a long time, it remains relatively stationary with respect to the torsion spring 4, but it has sliding friction with the shaft 7. In addition, the inner surface of the wear-resistant bushing 5 has a high hardness, which can extend the service life of the torsion spring 4.

[0033] The following is a brief explanation of the forward drive unlocking principle of the self-locking rotary mechanism according to the present invention.

[0034] like Figure 5 As shown, the driving wheel 6 has a first contact wall 61 and a second contact wall 62 spaced apart from each other. When the driving wheel 6 is driven by the motor 10 and the worm gear 9 to rotate counterclockwise in the CCW direction, the first contact wall 61 of the driving wheel 6 moves along arrow A (see arrow A). Figure 4 The first spring arm 42 of the torsion spring 4 is acted upon in the direction of arrow B and rotates, causing the winding force of the torsion spring 4 on the wear-resistant bushing 5 or shaft 7 to decrease. When the driving wheel 6 is driven by the motor 10 and the worm gear 9 to rotate clockwise in the CW direction, the second contact wall 62 of the driving wheel 6 moves along the direction of arrow B (see arrow B). Figure 4 The direction of the torsion spring 4 acts on the second spring arm 43 and drives it to rotate, and the winding force of the torsion spring 4 on the wear-resistant bushing 5 or the shaft 7 also decreases.

[0035] If the inner diameter of the ring portion 41 of the torsion spring 4 is larger than the outer diameter of the shaft 7 or the wear-resistant bushing 5, and the ring portion 41 is interference-fitted with the wear-resistant bushing 5 or the shaft 7, then when the driving wheel 6 is driven by the motor 10 and the worm gear 9 to rotate counterclockwise in the CCW direction, the first contact wall 61 of the driving wheel 6 moves along arrow A (see arrow A). Figure 4 The first spring arm 42 of the torsion spring 4 is acted upon in the direction of arrow B and rotates, causing the inner diameter of the coil portion 41 of the torsion spring 4 to increase, and the winding force of the torsion spring 4 on the wear-resistant bushing 5 or shaft 7 remains zero. When the driving wheel 6 is driven by the motor 10 and the worm gear 9 to rotate clockwise in the CW direction, the second contact wall 62 of the driving wheel 6 moves along the direction of arrow B (see arrow B). Figure 4 The direction of the force acts on the second spring arm 43 of the torsion spring 4 and causes it to rotate. The inner diameter of the ring part 41 of the torsion spring 4 increases, and the winding force of the torsion spring 4 on the wear-resistant bushing 5 or the shaft 7 remains zero.

[0036] When the positive drive wheel 6 is finally driven, both directions of rotation are in the unlocked state. The system itself, with its self-locking rotation mechanism, can output speed and torque through the normal rotation of the output gear 2.

[0037] The reverse-drive locking principle of the self-locking rotary mechanism according to the present invention is briefly described below.

[0038] like Figure 6 As shown, the driven wheel 3 has a first working wall 31 and a second working wall 32 spaced apart from each other. When an external force attempts to reverse the driven wheel 3 through the output gear 2 to rotate it counterclockwise in the CCW direction, the first working wall 31 of the driven wheel 3 moves along arrow C (see...). Figure 4 The force acting in the direction of the torsion spring 4 on the first spring arm 42 causes it to rotate, increasing the winding force of the torsion spring 4 on the wear-resistant bushing 5 or shaft 7. When an external force attempts to reverse the rotation of the driven wheel 3 clockwise in the CW direction via the output gear 2, the second acting wall 32 of the driven wheel 3 moves along arrow D (see arrow D). Figure 4 The direction of the torsion spring 4 acts on the second spring arm 43 and drives it to rotate, and the winding force of the torsion spring 4 on the wear-resistant bushing 5 or the shaft 7 also increases.

[0039] If the inner diameter of the ring portion 41 of the torsion spring 4 is larger than the outer diameter of the shaft 7 or the wear-resistant bushing 5, and the ring portion 41 is interference-fitted with the wear-resistant bushing 5 or the shaft 7, then when an external force attempts to reverse the driven wheel 3 through the output gear 2 to make it rotate counterclockwise in the CCW direction, the first working wall 31 of the driven wheel 3 moves along arrow C (see arrow C). Figure 4 The first spring arm 42 of the torsion spring 4 is acted upon in the direction of the arrow and rotates, causing the inner diameter of the coil portion 41 of the torsion spring 4 to decrease. The torsion spring 4 generates a winding force on the wear-resistant bushing 5 or the shaft 7. When an external force attempts to reverse the rotation of the driven wheel 3 in the clockwise direction CW through the output gear 2, the second acting wall 32 of the driven wheel 3 moves along the direction of arrow D (see arrow D). Figure 4 The direction of the torsion spring 4 is applied to the second spring arm 43 and causes it to rotate. The inner diameter of the coil portion 41 of the torsion spring 4 decreases, and the torsion spring 4 generates a winding force on the wear-resistant bushing 5 or the shaft 7.

[0040] When the reverse driven wheel 3 is driven, both rotations are locked. The system with the self-locking rotation mechanism can prevent rotation and keep it stationary.

[0041] Clearly, according to the self-locking rotary mechanism of the present invention, the self-locking capability of its independent self-locking structure only requires adjustment of the design of the torsion spring 4, without needing to bundle the transmission performance stage and the self-locking capability together. Therefore, a more efficient design can be used for the gear transmission system. Moreover, since the overall design of the mechanism has a higher transmission efficiency compared to traditional backrest adjustment mechanisms, the system's power requirement for the motor can be significantly reduced, thus lowering costs. In addition, the self-locking structure is optional and can be achieved by installing or not installing the torsion spring, making product platformization and tiering easier to realize.

[0042] In summary, the self-locking rotary mechanism according to the present invention can be used in applications requiring electric rotary output and self-locking, such as electric seat backrest adjustment, electric seat armrest adjustment, and electric unlocking mechanisms. In particular, even when not being adjusted, the self-locking rotary mechanism according to the present invention retains its self-locking property, making it difficult to reverse drive. When used in electric seat backrest adjustment, it can compensate for the self-locking property of the adjuster, ensuring that the seat backrest system remains self-locking even on bumpy roads.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention. Various variations can be made to the above embodiments of the present invention. That is, all simple and equivalent changes and modifications made based on the claims and description of this invention fall within the protection scope of the claims of this patent. All aspects not described in detail in this invention are conventional technical content.

Claims

1. A self-locking rotary mechanism, characterized in that, The rotating mechanism includes a driven wheel, a torsion spring, a driving wheel, and a shaft. The driving wheel is mounted on the shaft and driven in the forward direction by the driving mechanism. The driven wheel is mounted on the shaft and driven by the driving wheel. The torsion spring includes a coiled portion, a first spring arm, and a second spring arm. The coiled portion is wound around the shaft. The first spring arm extends radially outward from the top end of the coiled portion and is clamped between the driven wheel and the driving wheel. The second spring arm extends radially outward from the bottom end of the coiled portion and is clamped between the driven wheel and the driving wheel. When the driving wheel is driven in the forward direction, it acts on the torsion spring to put it in an unlocked state. When the driven wheel is driven in the reverse direction, it acts on the torsion spring to put it in a locked state. in, The driving wheel has a first contact wall. When the driving wheel is driven in the forward direction and rotates counterclockwise, the first contact wall acts on the first spring arm, so that the winding force of the torsion spring on the shaft remains zero or decreases. The driving wheel has a second abutting wall spaced apart from the first abutting wall. When the driving wheel is driven in the forward direction and rotates clockwise, the second abutting wall acts on the second spring arm so that the winding force of the torsion spring on the shaft remains zero or decreases. The driven wheel has a first working wall. When the driven wheel is driven in the opposite direction and rotates counterclockwise, the first working wall acts on the first spring arm, causing the torsion spring to generate a winding force on the shaft or increasing the winding force of the torsion spring on the shaft. The driven wheel has a second working wall spaced apart from the first working wall. When the driven wheel is driven in the opposite direction and rotates clockwise, the second working wall acts on the second spring arm, causing the torsion spring to generate a winding force on the shaft or increasing the winding force of the torsion spring on the shaft. in, The rotating mechanism also includes a wear-resistant bushing, which serves as a friction component and is clamped between the shaft and the ring portion. The wear-resistant bushing has a rough outer wall acting on the ring portion and a smooth inner wall acting on the shaft, and When the drive wheel is driven in the forward direction, the drive wheel drives the torsion spring to rotate around the shaft, and the torsion spring drives the wear-resistant bushing to rotate synchronously.

2. The rotating mechanism according to claim 1, characterized in that, The rotating mechanism also includes a cover plate and a housing, which are fixedly connected along a first direction by snap-fit, and the shaft extends along the first direction and is non-rotatably supported on the cover plate and the housing at both ends.

3. The rotating mechanism according to claim 2, characterized in that, The rotating mechanism also includes an output gear, the two axial ends of which are rotatably supported on the cover plate and the housing, and the output gear meshes with the driven wheel to be driven by the driven wheel.

4. The rotating mechanism according to claim 2, characterized in that, The rotating mechanism also includes a worm gear and a motor as a drive mechanism. The motor is fixedly connected to the housing along a second direction perpendicular to the first direction. The worm gear is mounted on the output shaft of the motor to be driven to rotate by the motor. The worm gear meshes with the drive wheel to drive the drive wheel.

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