A clutch device for an active seat belt retractor of an automobile

Abstract

The present invention discloses a clutch device for an active safety belt retractor of an automobile, comprising: a ratchet gear and a clutch, wherein the ratchet gear is drivingly connected to a retracting drum arranged inside a retractor frame; the clutch is arranged on the side of the retractor frame, and comprises: a front plate, a friction unit, a slider, a rear plate and a fixing mechanism; the front plate is provided with a guide groove; the friction unit is provided with a slider groove; the slider is provided with a control column that can slide along the guide groove, and the slider is slidably arranged in the slider groove; the front plate and the rear plate are fixedly connected by the fixing mechanism, and the friction unit is rotatably arranged between the front plate and the rear plate, and then when the friction unit and the front plate rotate relative to each other, the slider slides in the slider groove and then engages or disengages the ratchet gear. The present invention has low production difficulty, simple assembly and reliable structure.

Description

Technical Field

[0001] The invention relates to the technical field of seat belts, and in particular to a clutch device for an active seat belt retractor of an automobile. Background Art

[0002] With the advancement of technology, the popularity of active seat belts has been further improved, and it has become a standard feature of mid-to-high-end cars. Based on the ordinary passive seat belt retractor, a motor is added, which is connected to the active safety system of the car. It can tighten the belt before potential danger, adjust the passenger's sitting posture and reduce the gap between the belts, which can better protect the passengers.

[0003] When the active pretensioner is working, it needs to be able to drive the reel to recycle the webbing. When the active pretensioner is not working, a device is needed to cut off the active system from other parts of the seat belt so as not to interfere with the normal use of the seat belt. This device generally uses a one-way clutch.

[0004] However, the existing clutch has many parts, the production and assembly process is cumbersome, and the structure is complex, which is not conducive to cost control and efficiency management.

[0005] A clutch (CN104742854A) of an active seat belt retractor for an automobile comprises a clutch ratchet, a friction drive constraint disk, a clutch pawl, a worm gear seat and a transmission base, wherein the worm gear seat is connected to the output end of a motor, the worm gear seat is mounted on the inner side of the transmission base, the friction drive constraint disk is mounted on the inner side of the worm gear seat, the friction drive constraint disk and the transmission base are connected by an open elastic outward expansion hook, a waist-shaped guide hole is provided on the surface of the friction drive constraint disk, a guide shaft is provided on the side surface of one end of the clutch pawl, the guide shaft is mounted in the waist-shaped guide hole, the clutch pawl is located in a slideway of the worm gear seat, the clutch ratchet is located outside the friction drive constraint disk, an engaging tooth structure is provided on the inner surface of the clutch ratchet, the other end of the clutch pawl is engaged or disengaged with the engaging tooth structure, and the clutch ratchet is connected to a seat belt reel. The same function is achieved, but the implementation structure is quite different. In the comparative document, the transmission or disconnection is achieved by whether the clutch claw hooks the clutch ratchet. The disadvantage is that although the number of parts seems to be small, the four main parts of the clutch ratchet, friction drive constraint plate, clutch claw, and turbine seat have many features, which are more complicated to produce, especially the clutch ratchet contains a large circle of internal teeth, and the processing of this part is complicated and the cost is high. However, each part of the present invention is very simple, and can be directly punched and injection molded by sheet metal, and the mold is also very simple, simple to assemble, and can be easily realized by assembly line, which greatly improves production efficiency and reduces costs. Summary of the invention

[0006] In order to solve the above technical problems, an embodiment of the present invention provides a clutch device for an active seat belt retractor of an automobile, comprising a ratchet gear and a clutch, wherein the ratchet gear is transmission-connected to a reel-up drum arranged inside a reel-up frame; the clutch is arranged on the side of the reel-up frame, comprising: a front plate, a friction unit, a slider, a rear plate and a fixing mechanism; a guide groove is provided on the front plate; a slider groove is provided on the friction unit; a control column capable of sliding along the guide groove is provided on the slider, and the slider is slidably arranged in the slider groove; the front plate and the rear plate are fixedly connected by the fixing mechanism, and the friction unit is rotatably arranged between the front plate and the rear plate, so that when the friction unit and the front plate rotate relative to each other, the slider slides in the slider groove and engages or disengages the ratchet gear.

[0007] The present invention is achieved by at least one of the following technical solutions.

[0008] A clutch device for an active safety belt retractor of an automobile comprises a retractor frame, a ratchet gear and a clutch, wherein the ratchet gear is connected to a retractor drum inside the retractor frame, and the clutch is arranged in a circular groove on the side of the retractor frame and is connected to the ratchet gear in a transmission or transmission-disconnecting manner.

[0009] Further, the clutch comprises a front plate, a friction unit, a slider, a rear plate and a fixing mechanism;

[0010] The front plate is provided with a guide groove; the friction unit is provided with a slider groove; the slider is provided with a control column that can slide along the guide groove, and the slider is slidably arranged in the slider groove; the front plate and the rear plate are fixedly connected by the fixing mechanism; the friction unit is rotatably arranged between the front plate and the rear plate.

[0011] Furthermore, a friction portion is provided on the circumferential surface of the friction unit, and the friction portion frictionally cooperates with the outer wall of the circular groove. Therefore, when the friction unit and the front plate rotate relative to each other, the control column cooperates with the guide groove, so that the slider slides in the slider groove and engages or disengages the ratchet gear.

[0012] Furthermore, the friction unit includes a friction plate and a base, the base is provided with a fixing column, the friction plate is provided with a fixing hole that can be clamped with the fixing column, the base and the friction plate are connected through the fixing column and the fixing hole; the friction plate rotates relative to the front plate.

[0013] Furthermore, the friction part includes a mounting block arranged on the circumferential surface of the friction plate and a friction protrusion arranged on the mounting block. The clutch is rotatably engaged in a circular groove on the side of the retractor frame through the mounting block. The friction force generated causes the rotation of the friction plate together with the base to lag behind the front plate.

[0014] Furthermore, the bottom end of the sliding block is an inclined section, and the inclination angle of the section is the same as the inclination angle of the gear end face of the ratchet gear.

[0015] Further, the fixing mechanism includes a pin and a first pin fixing hole provided on the front plate, a first pin sliding groove provided on the friction plate, a second pin sliding groove provided on the base, and a second pin fixing hole provided on the rear plate;

[0016] Furthermore, the pin passes through the first pin fixing hole, the first pin sliding groove, the second pin sliding groove and the second pin fixing hole in sequence, thereby assembling the front plate, the friction plate and the base on the rear plate.

[0017] Furthermore, the first pin sliding groove and the second pin sliding groove are both arc-shaped grooves.

[0018] Furthermore, the front end surface of the front plate is connected to the rotating shaft of the reduction motor, and the front plate is directly driven by the reduction motor of the reduction box.

[0019] The working principle of a clutch device for an active safety belt retractor of an automobile according to the present invention:

[0020] When the reduction motor of the automobile reduction box drives the front plate to rotate counterclockwise, the friction plate and the base body lag behind the front plate due to the friction force, and the two rotate relative to each other. The control column of the slider slides along the guide groove, causing the slider to slide downward in the slider groove and engage the ratchet gear.

[0021] When the reduction motor of the automobile reduction box drives the front plate to rotate clockwise, the front plate drives the control column of the slider to rotate together, and the slider contracts and cuts off the transmission with the ratchet gear.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The structure of several parts of the clutch is relatively simple, mostly in the form of grooves, through holes or bolts, with low production difficulty and easy assembly. The clutch has a firm structure and stable functions, and can meet the needs of different power transmission when the seat belt is retracted through the slider. The invention has low production difficulty, simple assembly and reliable structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of a clutch device for an active safety belt retractor of an automobile according to the present invention;

[0025] Figure 2 is a schematic diagram of a clutch of the present invention;

[0026] Figure 3It is a schematic diagram of the clutch splitting of the present invention;

[0027] Figure 4 is a schematic diagram of a friction plate and a slider of the present invention;

[0028] Among them, 1-ratchet gear, 2-clutch, 21-front plate, 211-guide groove, 22-friction unit, 221-slider groove, 222-friction plate, 223-base, 224-fixing column, 225-fixing hole, 226-mounting block, 227-protrusion, 228-friction part, 23-slider, 231-control column, 24-rear plate, 25-fixing mechanism, 251-pin, 252-fixing hole, 253-first pin sliding groove, 254-second pin sliding groove, 255-second pin fixing hole. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] The present invention discloses a clutch device for an active safety belt retractor for an automobile, comprising a ratchet gear and a clutch, wherein the ratchet gear is connected to a retracting drum arranged inside a retractor frame; the clutch is arranged on the side of the retractor frame, and comprises: a front plate, a friction unit, a slider, a rear plate and a fixing mechanism; the front plate is provided with a guide groove; the friction unit is provided with a slider groove; the slider is provided with a control column that can slide along the guide groove, and the slider is slidably arranged in the slider groove; the front plate and the rear plate are fixedly connected by the fixing mechanism, the friction unit is rotatably arranged between the front plate and the rear plate, and then when the friction unit and the front plate rotate relative to each other, the slider slides in the slider groove and then engages or disengages the ratchet gear. When the reduction motor of the automobile reduction box drives the front plate to rotate counterclockwise, the friction plate and the base body lag behind the front plate due to the friction force, and the two rotate relative to each other, and the control column of the slider slides along the guide groove, so that the slider slides downward in the slider groove and engages and drives the ratchet gear. When the reduction motor of the automobile reduction box drives the front plate to rotate clockwise, the front plate drives the control column of the slider to rotate together, and the slider contracts and cuts off the transmission with the ratchet gear.

[0031] Example 1

[0032] A clutch device for an active safety belt retractor of an automobile, comprising: a ratchet gear and a clutch; the ratchet gear is drivingly connected to a reeling drum arranged inside a reeling frame; the clutch is arranged in a circular groove on the side of the reeling frame, comprising: a front plate, a friction unit, a slider, a rear plate and a fixing mechanism; a guide groove is arranged on the front plate; a slider groove is arranged on the friction unit, a friction part is arranged on the circumferential surface of the friction unit, the friction part is frictionally matched with the circular groove, a control column that can slide along the guide groove is arranged on the slider, and the slider is slidably arranged in the slider groove; the front plate and the rear plate are fixedly connected by the fixing mechanism, the friction unit is rotatably arranged between the front plate and the rear plate, the guide groove links the control column to make the slider engage or disengage the ratchet gear.

[0033] The friction unit includes a friction plate and a base, the base is provided with a fixing column, and the friction plate is provided with a fixing hole that can be clamped with the fixing column. The friction part includes a mounting block provided on the circumference of the friction plate and a friction protrusion provided on the mounting block, and the clutch can be rotatably clamped in the circular groove on the side of the retractor frame through the mounting block.

[0034] The fixing mechanism includes a pin and a first pin fixing hole provided on the front plate, a first pin sliding groove provided on the friction plate, a second pin sliding groove provided on the base, and a second pin fixing hole provided on the rear plate.

[0035] The pin passes through the first pin fixing hole, the first pin sliding groove, the second pin sliding groove and the second pin fixing hole in sequence, thereby assembling the front plate, the friction plate and the base on the rear plate.

[0036] The first pin sliding groove and the second pin sliding groove are both arc-shaped grooves, and thus the first pin sliding groove and the second pin sliding groove are slidably matched with the pin to limit the rotation angle of the friction plate and the base.

[0037] The bottom end of the sliding block is an inclined section, and the inclination angle of the section is the same as the inclination angle of the gear end face of the ratchet gear.

[0038] The working principle of a clutch device for an active safety belt retractor of an automobile according to the present invention:

[0039] When the reduction motor of the automobile reduction box drives the front plate to rotate counterclockwise, the friction plate and the base body lag behind the front plate due to the friction force, and the two rotate relative to each other. The control column of the slider slides along the guide groove, causing the slider to slide downward in the slider groove and engage the ratchet gear.

[0040] When the reduction motor of the automobile reduction box drives the front plate to rotate clockwise, the front plate drives the control column of the slider to rotate together, and the slider contracts and cuts off the transmission with the ratchet gear.

[0041] Example 2

[0042] A clutch device for an active seat belt retractor of an automobile, such as Figure 1 As shown, it includes a retractor frame, a ratchet gear 1 and a clutch 2.

[0043] The ratchet gear 1 is provided with ratchet teeth on its outer periphery, and the ratchet gear 1 is transmission-connected to a reeling drum arranged inside the reeling frame. The clutch 2 is arranged in a circular groove on the side of the reeling frame, and is transmission-connected or transmission-disconnected to the ratchet gear 1.

[0044] like Figure 2 , Figure 3 As shown, the clutch 2 includes a front plate 21 , a friction unit 22 , a sliding block 23 , a rear plate 24 and a fixing mechanism 25 .

[0045] The front plate 21 is provided with a guide groove 211 . The friction unit 22 is provided with a slider groove 221 . The slider 23 is provided with a control column 231 that can slide along the guide groove 211 , and the slider 23 is slidably disposed in the slider groove 221 .

[0046] The front plate 21 and the rear plate 24 are fixedly connected by the fixing mechanism 25, and the friction unit 22 is rotatably arranged between the front plate 21 and the rear plate 24. A friction portion 228 is provided on the circumferential surface of the friction unit 22, and the friction portion 228 can be frictionally matched with the outer wall of the circular groove, so that when the friction unit 22 and the front plate 21 rotate relative to each other, the control column 231 cooperates with the guide groove 211, so that the slider 23 slides in the slider groove 221 and then engages or disengages the ratchet gear 1.

[0047] As a preferred embodiment, Figure 3 As shown, the friction unit 22 includes: a friction plate 222 and a base 223, the base 223 is provided with a fixing column 224, the friction plate 222 is provided with a fixing hole 225 that can be clamped with the fixing column 224, and the base 223 and the friction plate 222 are connected by the fixing column 224 and the fixing hole 225 to form the friction unit 22.

[0048] Of course, the friction unit 22 may also be a single component, which only needs to accommodate the slider 23 and rotate relative to the front plate 21 , and the present invention is not limited thereto.

[0049] like Figure 4As shown, the friction part 228 in this embodiment includes: a mounting block 226 arranged on the circumferential surface of the friction plate 222 and a friction protrusion 227 arranged on the mounting block 226. The clutch 2 can be rotatably engaged in the circular groove on the side of the retractor frame through the mounting block 226, and a certain friction force is generated to make the rotation of the friction plate 222 together with the base 223 lag behind the front plate 21.

[0050] like Figure 4 As shown, the bottom end of the slider 23 is an inclined section, and the inclination angle of the section is the same as the inclination angle of the gear end face of the ratchet gear 1, so that the slider can be better engaged with the outer peripheral surface of the ratchet gear 1.

[0051] As another preferred embodiment, Figure 3 As shown, the fixing mechanism 25 includes: a pin 251 and a first pin fixing hole 252 provided on the front plate 21, a first pin sliding groove 253 provided on the friction plate 222, a second pin sliding groove 254 provided on the base 223, and a second pin fixing hole 255 provided on the rear plate 24;

[0052] The pin 251 passes through the first pin fixing hole 252 , the first pin sliding groove 253 , the second pin sliding groove 254 and the second pin fixing hole 255 in sequence, thereby assembling the front plate 21 , the friction plate 222 and the base 223 on the rear plate 24 .

[0053] More preferably, the first pin sliding groove 253 and the second pin sliding groove 254 are both arc-shaped grooves, and thus the first pin sliding groove 253 and the second pin sliding groove 254 slide in cooperation with the pin 251 to limit the rotation angle of the friction plate 222 and the base 24 .

[0054] The working principle of a clutch device for an active safety belt retractor of an automobile according to the present invention:

[0055] When the reduction motor of the automobile reduction box drives the front plate 21 to rotate counterclockwise, the friction plate 222 and the base 223 lag behind the front plate due to the friction force, and the two rotate relative to each other. The control column 231 of the slider 23 slides along the guide groove 211, so that the slider 23 slides downward in the slider groove 221 and engages and transmits the ratchet gear 1.

[0056] When the reduction motor of the automobile reduction box drives the front plate 21 to rotate clockwise, the front plate 21 drives the control column 231 of the slider to rotate together, and the slider 23 contracts and cuts off the transmission with the ratchet gear 1.

[0057] It should be noted that the front plate 21 in this embodiment can be directly driven by the reduction motor of the reduction box. Specifically, the rotating shaft of the reduction motor is fixedly connected to the front end surface of the front plate 21, and its connection method includes but is not limited to conventional methods such as bolt connection and riveting.

[0058] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A clutch device for an active seat belt retractor of an automobile, characterized in that: It includes a retractor frame, a ratchet gear and a clutch, wherein the ratchet gear is connected to a retractor drum inside the retractor frame, and the clutch is arranged in a circular groove on the side of the retractor frame and is connected to the ratchet gear in a transmission or cut-off transmission manner; The clutch comprises a front plate, a friction unit, a slider, a rear plate and a fixing mechanism; The front plate is provided with a guide groove; the friction unit is provided with a slider groove; the slider is provided with a control column that can slide along the guide groove, and the slider is slidably arranged in the slider groove; the front plate and the rear plate are fixedly connected by the fixing mechanism; the friction unit is rotatably arranged between the front plate and the rear plate; A friction portion is provided on the circumferential surface of the friction unit, and the friction portion is frictionally matched with the outer wall of the circular groove, so that when the friction unit and the front plate rotate relative to each other, the control column cooperates with the guide groove, so that the slider slides in the slider groove and engages or disengages the ratchet gear; The friction unit comprises a friction plate and a base, the base is provided with a fixing column, the friction plate is provided with a fixing hole that can be clamped with the fixing column, the base and the friction plate are connected through the fixing column and the fixing hole; the friction plate rotates relative to the front plate; The friction part includes a mounting block arranged on the peripheral surface of the friction plate and a friction protrusion arranged on the mounting block. The clutch is rotatably engaged in a circular groove on the side of the retractor frame through the mounting block. The friction force generated causes the rotation of the friction plate together with the base to lag behind the front plate.

2. A clutch device for an active seat belt retractor of a vehicle according to claim 1, characterized in that: The bottom end of the sliding block is an inclined section, and the inclination angle of the section is the same as the inclination angle of the gear end face of the ratchet gear.

3. The clutch device for an active safety belt retractor of a vehicle according to claim 1, characterized in that: The fixing mechanism includes a pin and a first pin fixing hole provided on the front plate, a first pin sliding groove provided on the friction plate, a second pin sliding groove provided on the base, and a second pin fixing hole provided on the rear plate.

4. A clutch device for an active safety belt retractor of a vehicle according to claim 3, characterized in that: The pin passes through the first pin fixing hole, the first pin sliding groove, the second pin sliding groove and the second pin fixing hole in sequence, thereby assembling the front plate, the friction plate and the base on the rear plate.

5. The clutch device for an active safety belt retractor of a vehicle according to claim 3, characterized in that: The first pin sliding groove and the second pin sliding groove are both arc-shaped grooves.

6. A clutch device for an active safety belt retractor for an automobile according to any one of claims 2 to 5, characterized in that: The front end surface of the front plate is connected to the rotating shaft of the reduction motor, and the front plate is directly driven by the reduction motor of the reduction box.

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