One-way clutch, transmission structure and vehicle

Abstract

The utility model provides a one-way clutch, a transmission structure and a vehicle. The one-way clutch comprises an input shaft, a plurality of pawl sets, a plurality of tensioning pieces and a ratchet wheel. One end of the tensioning piece is connected with the input shaft, and the other end of the tensioning piece is in elastic contact / connection with the pawl, so that the free end of the pawl abuts against the inner surface of the ratchet wheel, and ratchets are arranged on the inner surface of the ratchet wheel. Pawls of each pawl set are evenly distributed on the circumference of the ratchet wheel, and different pawl sets are staggered by a preset angle. When the input shaft rotates in the first rotating direction, the pawls of only one pawl set are meshed with the ratchets of the ratchet wheel at the same moment. The two groups of pawls are distributed in a staggered manner, so that when the pawls are meshed with the ratchet wheel at any position, part of the pawls are always in a meshed state, and part of the pawls are in a non-meshed state, and the slippage process in the prior art is greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of clutches, in particular to a one-way clutch, transmission structure and traffic tool. BACKGROUND

[0002] The one-way clutch functions to transmit torque between two shafts in one rotation direction under certain conditions, but not in the opposite direction, i.e., the shafts can rotate freely. This property makes the one-way clutch play an important role in many mechanical transmission systems, such as the traditional system of a bicycle. Patent document CN209959758U discloses a ratchet pawl one-way clutch for an electric vehicle, which includes an inner wheel connected to a power input end, a ratchet wheel connected to an electric vehicle action mechanism outside the inner wheel, a pawl, and a spring supporting the pawl. The inner wall of the ratchet wheel is provided with ratchet teeth.

[0003] This kind of traditional one-way clutch structure is mainly a single-paw single-tooth structure, i.e., a pawl has only one tooth. The size of the ratchet wheel groove and the pawl is relatively large, and there is a large sliding process when the rotation is engaged to a specific angle, which affects the accuracy of the pedaling torque and the riding experience. SUMMARY

[0004] In view of the defects in the prior art, the utility model aims to provide a one-way clutch, transmission structure and traffic tool.

[0005] According to the utility model, the one-way clutch comprises an input shaft 1, a plurality of pawl groups, a plurality of tensioning members 2, and a ratchet wheel 4.

[0006] The input shaft 1 is coaxially arranged inside the ratchet wheel 4.

[0007] Each pawl group comprises three or more than three pawls 3. One end of each pawl 3 is rotatably connected to the input shaft 1, and the other end is a free end.

[0008] The tensioning members 2 correspond to the pawls 3 one by one. One end of each tensioning member 2 is connected to the input shaft 1, and the other end is in elastic contact / connection with the pawl 3, so that the free end of the pawl 3 abuts against the inner surface of the ratchet wheel 4. The inner surface of the ratchet wheel 4 is provided with ratchet teeth.

[0009] The pawls 3 of each pawl group are evenly distributed on the circumference of the ratchet wheel 4, and the pawls 3 of different pawl groups are mutually offset by a preset angle.

[0010] When the input shaft 1 rotates in a first rotation direction, only the pawls 3 of one pawl group are engaged with the ratchet teeth of the ratchet wheel 4.

[0011] When the input shaft 1 rotates in the second rotation direction, the pawls 3 of all the pawl groups slide and rub against the ratchet teeth.

[0012] Further, the preset angle is 1 / n of the corresponding angle of each ratchet tooth of the ratchet wheel 4 in the circumference, and n is the number of the groups of the pawls.

[0013] Further, the ratchet wheel 4 is fixedly connected to the inner surface of the output shaft 7, or the ratchet wheel 4 is integrally formed with the output shaft 7.

[0014] The input shaft 1 is rotatably connected to the inside of the output shaft 7 through the bearing 6.

[0015] Further, the retaining ring 5 is sleeved on the input shaft 1, and axially limits the pawls 3 and the tensioning piece 2.

[0016] Further, the number of the ratchet teeth of the ratchet wheel 4 is 57.

[0017] Further, the number of the pawls 3 of each group of the pawl groups is greater than or equal to 3.

[0018] Further, one side of the pawl 3 towards the ratchet wheel 4 is provided with an engagement surface 301, and the engagement surface 301 is provided with a plurality of small teeth, and the spacing between the ratchet teeth is matched with the spacing between the small teeth of each pawl 3.

[0019] Further, the number of the small teeth of each engagement surface 301 is 3.

[0020] According to the transmission structure, the one-way clutch is provided.

[0021] According to the vehicle, the one-way clutch is provided.

[0022] Compared with the prior art, the utility model has the advantages that:

[0023] The two groups of pawls are distributed in a staggered manner, so that when the pawls and the ratchet wheel are engaged at any position, part of the pawls is always in an engaged state, and part of the pawls is in a disengaged state. Moreover, the engaged pawls and the disengaged pawls are uniformly distributed, so that the stress state is uniformly distributed, the sliding process in the prior art can be greatly reduced, the transmission accuracy of the torque can be greatly improved, the vehicle can be used in some occasions with high torque accuracy requirement, and the structure is simple and the cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0024] Other characteristics, objects and advantages of the utility model will become more apparent through reading the following detailed description of the non-restrictive embodiments with reference to the accompanying drawings:

[0025] Figure 1 is a side view of a one-way clutch;

[0026] Figure 2 is a sectional view of a one-way clutch;

[0027] Figure 3 is a structural schematic view of a pawl. DETAILED DESCRIPTION

[0028] The utility model will be explained in detail below in combination with specific embodiments. The following embodiments will help the person skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be pointed out that, for those skilled in the art, without departing from the concept of the utility model, a number of changes and improvements can be made. These all belong to the protection scope of the utility model.

[0029] As Figure 1 shown, the utility model provides a one-way clutch, it includes: input shaft 1, first pawl group, second pawl group, a plurality of tensioning piece 2 and ratchet wheel 4. In this embodiment, the number of pawl group is two groups, in other embodiments, it can be three groups or even more, the utility model does not limit this.

[0030] Input shaft 1 is coaxially arranged in the inside of ratchet wheel 4, and the inner surface of ratchet wheel 4 is provided with ratchet teeth. One end of pawl 3 is rotatably connected to input shaft 1, and the other end is a free end. Tensioning piece 2 corresponds to pawl 3 one by one, one end is connected to input shaft 1, and the other end is in elastic contact / connection with pawl 3, so that the free end of pawl 3 abuts against the inner surface of ratchet wheel 4.

[0031] The number of pawl 3 of first pawl group and second pawl group is 3 respectively, and the pawl 3 of first pawl group and second pawl group is evenly distributed on the circumference of ratchet wheel 4 respectively, of course, the number of pawl of each group can also be any number, as long as these pawls are evenly distributed on the ratchet wheel. The pawl 3 of first pawl group and the pawl 3 of second pawl group are distributed in mutual staggered positions. In this embodiment, the staggered angle of first pawl group and second pawl group is half of the corresponding angle of each ratchet tooth of ratchet wheel 4 on the circumference, that is, when there are n groups of meshing pawls, the staggered angle is 1 / n of the corresponding angle of each tooth of ratchet ring. Therefore, when input shaft 1 rotates in the first rotation direction, only the pawl 3 of one of first pawl group and second pawl group is engaged with the ratchet tooth of ratchet wheel 4 at the same time. When input shaft 1 rotates in the second rotation direction, the pawl 3 of first pawl group and second pawl group is in sliding friction with the ratchet tooth.

[0032] As Figure 2As shown, the ratchet 4 is fixedly connected to the inner surface of the output shaft 7, or the ratchet 4 is integrally formed with the output shaft 7. The input shaft 1 is rotatably connected to the inside of the output shaft 7 via the bearing 6. The retaining ring 5 is sleeved on the input shaft 1 to axially limit the ratchet pawl 3 and the tensioner 2.

[0033] The ratchet 4 has 57 teeth. The more teeth on the ratchet ring, the higher the pedaling accuracy. Pedal accuracy = 360° / (number of teeth on the ratchet ring * 2). For example, this application lists a ratchet ring with 57 teeth, so each tooth angle is 6.3°. One set of pawls is engaged with the ratchet ring, and the other set is disengaged. Whenever the ratchet rotates by 0.5 teeth (3.2°), one set of pawls will be engaged.

[0034] like Figure 3 As shown, the pawl 3 has a meshing surface 301 on the side facing the ratchet 4. The meshing surface 301 includes multiple small teeth, and the spacing between the ratchet teeth is adapted to the spacing between the small teeth of each pawl 3. In this embodiment, the number of small teeth is 3, but this utility model does not limit this. The minimum transmission accuracy is the angle of 1 ratchet tooth; the smaller the ratchet tooth, the higher the transmission accuracy.

[0035] The one-way clutch of this invention can be used in the transmission structure of electric-assisted or human-powered bicycles, thereby improving transmission accuracy.

[0036] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0037] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A one-way clutch characterized by, Comprising: an input shaft (1), a plurality of pawl groups, a plurality of tensioning members (2), and a ratchet wheel (4); the input shaft (1) is coaxially arranged inside the ratchet wheel (4); each pawl group comprises three or more pawls (3), one end of which is rotatably connected to the input shaft (1), and the other end is a free end; the tensioning members (2) correspond one-to-one to the pawls (3), one end of which is connected to the input shaft (1), and the other end is in elastic contact / connection with the pawls (3), so that the free end of the pawls (3) abuts against the inner surface of the ratchet wheel (4), and the inner surface of the ratchet wheel (4) is provided with ratchet teeth; the pawls (3) of each pawl group are evenly distributed on the circumference of the ratchet wheel (4), and the pawls of different pawl groups are staggered by a preset angle; when the input shaft (1) rotates in a first rotation direction, only the pawls (3) of one pawl group are engaged with the ratchet teeth of the ratchet wheel (4); when the input shaft (1) rotates in a second rotation direction, the pawls (3) of all pawl groups are in sliding friction with the ratchet teeth.

2. The one-way clutch of claim 1, wherein, The preset angle is 1 / n of the corresponding angle of each ratchet tooth of the ratchet wheel (4) on the circumference, and n is the number of pawl groups.

3. The one-way clutch of claim 1, wherein, Further comprising an output shaft (7), the ratchet wheel (4) is fixedly connected to the inner surface of the output shaft (7), or the ratchet wheel (4) is integrally formed with the output shaft (7); the input shaft (1) is rotatably connected to the inside of the output shaft (7) through a bearing (6).

4. The one-way clutch of claim 1, wherein, Further comprising a retaining ring (5) sleeved on the input shaft (1) to axially limit the pawls (3) and the tensioning members (2).

5. The one-way clutch of claim 1, wherein, The number of ratchet teeth of the ratchet wheel (4) is 57.

6. The one-way clutch of claim 1, wherein, The number of pawls (3) in each pawl group is three or more.

7. The one-way clutch of claim 1, wherein, The side of the pawl (3) facing the ratchet wheel (4) has an engagement surface (301), and the engagement surface (301) comprises a plurality of small teeth, and the spacing between the ratchet teeth is matched with the spacing between the small teeth of each pawl (3).

8. The one-way clutch of claim 7, wherein, The number of small teeth of each engagement surface (301) is three.

9. A transmission arrangement, characterized in that The one-way clutch of any one of claims 1-8.

10. A vehicle, characterized by The one-way clutch of any one of claims 1-8.

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