Ratchet clutch with friction cam

Abstract

The utility model provides a ratchet clutch with a friction cam, which is mainly applied to the technical field of transmission, in particular to the technical field of ratchet clutches. The ratchet clutch with the friction cam comprises a pawl, a ratchet, a return spring, a pawl seat and the friction cam. Under the direct or indirect friction action of the pawl seat or the ratchet wheel, the friction cam can selectively rotate relative to the ratchet wheel or the pawl seat within a certain angle range. And under the direct or indirect action of the friction cam, the return spring and the pawl, the pawl seat and the ratchet wheel can be selectively separated and combined. Compared with the prior art, the ratchet clutch provided with the friction cam can reduce operation noise between the pawl and the ratchet wheel in the separated state.

Description

Technical Field

[0001] This utility model relates to a ratchet clutch with a friction cam, mainly used in the field of transmission technology. Background Technology

[0002] Ratchet clutches utilize the interaction between a pawl and a ratchet to selectively engage or disengage various power or motions. Due to their simple structure and high load-bearing capacity, they are widely used in various transmission systems. Ratchet clutches can engage or disengage automatically or with the aid of an external actuation device. When a ratchet clutch operates in the disengaged or overrunning state, especially when used as an overrunning clutch, one-way clutch, or one-way brake, the pawl and ratchet continuously collide under the action of the spring, generating vibration and noise, thus increasing the noise level in the operator's working environment. Therefore, how to reduce the noise between the pawl and ratchet in the disengaged or overrunning state has become a pressing technical problem in the field of ratchet clutches. Summary of the Invention

[0003] To address the aforementioned technical problems in ratchet clutches, this invention aims to provide a ratchet clutch equipped with a friction cam. The ratchet clutch with the friction cam is used to connect at least two components of a machine, device, transmission system, or mechanism, and / or to selectively engage or disengage the power or motion of the connected moving part using the interaction between the pawl and the ratchet, and / or to selectively decelerate, stop, or maintain a stopped state of the connected moving part using the interaction between the pawl and the ratchet.

[0004] This utility model is achieved through the following solution:

[0005] The ratchet clutch with a friction cam includes: a pawl, a ratchet, a return spring, a pawl seat, and a friction cam. The friction cam is mounted on the ratchet and interacts with the pawl seat through friction. Under the frictional action of the pawl seat, the friction cam can rotate relative to the ratchet within a certain angle range. Alternatively, the friction cam is mounted on the pawl seat and interacts with the ratchet through friction. Under the frictional action of the ratchet, the friction cam can rotate relative to the pawl seat within a certain angle range. The return spring is connected to the pawl. When the friction cam is mounted on the ratchet, the pawl is mounted on the pawl seat, and the friction cam is connected to the pawl, allowing the pawl to rotate relative to the pawl seat within a certain angle range. When the friction cam is mounted on the pawl seat, the pawl is mounted on the pawl seat, and the friction cam is connected to the pawl, allowing the pawl to rotate relative to the pawl seat within a certain angle range. Alternatively, when the friction cam is mounted on the pawl seat, the pawl is mounted on the friction cam, and the pawl seat is connected to the pawl. Within a certain angular range, the pawl is rotatable relative to the friction cam. Under the action of the friction cam, the return spring, and the pawl, the pawl seat and the ratchet selectively engage and disengage. The ratchet and the pawl seat are respectively connected to external components (the external components refer to components excluding the "components with the ratchet clutch equipped with the friction cam").

[0006] Further, the pawl includes a first pawl 1. The ratchet includes a first ratchet 2. The return spring includes a first return spring 3. The pawl seat includes a first pawl seat 4. The friction cam includes a first friction cam 5. The first friction cam 5 is disposed on the first ratchet 2, and interacts with the first pawl seat 4 through friction. Under the frictional action of the first pawl seat 4, the first friction cam 5 is rotatable relative to the first ratchet 2 between a first limited angle position and a second limited angle position. The first return spring 3 is connected to the first pawl 1. When the first friction cam 5 is disposed on the first ratchet 2, the first pawl 1 is disposed on the first pawl seat 4, and the first friction cam 5 is connected to the first pawl 1. Within a certain angle range, the first pawl 1 is rotatable relative to the first pawl seat 4. When the first friction cam 5 is disposed on the first ratchet 2, and when the first friction cam 5 rotates relative to the first ratchet 2 to the first limited angle position, under the action of the first friction cam 5, the first return spring 3, and the first pawl 1, the first pawl seat 4 and the first ratchet 2 selectively engage. When the first friction cam 5 is mounted on the first ratchet 2, and when the first friction cam 5 rotates relative to the first ratchet 2 to the second defined angle position, under the action of the first friction cam 5, the first return spring 3, and the first pawl 1, the first pawl seat 4 is separated from the first ratchet 2. The first ratchet 2 and the first pawl seat 4 are respectively connected to the external components.

[0007] Alternatively, the pawl includes a first pawl 1. The ratchet includes a first ratchet 2. The return spring includes a first return spring 3. The pawl seat includes a first pawl seat 4. The friction cam includes a first friction cam 5. The first friction cam 5 is disposed on the first pawl seat 4, and interacts with the first ratchet 2 through friction. Under the frictional action of the first ratchet 2, the first friction cam 5 is rotatable relative to the first pawl seat 4 between a first defined angular position and a second defined angular position. The first return spring 3 is connected to the first pawl 1. When the first friction cam 5 is disposed on the first pawl seat 4, the first pawl 1 is disposed on the first pawl seat 4, the first friction cam 5 is connected to the first pawl 1, and the first pawl 1 is rotatable relative to the first pawl seat 4 within a certain angular range. When the first friction cam 5 is mounted on the first pawl seat 4, and when the first friction cam 5 rotates relative to the first pawl seat 4 to the first limited angle position, the first pawl seat 4 and the first ratchet 2 selectively engage under the action of the first friction cam 5, the first return spring 3, and the first pawl 1. When the first friction cam 5 is mounted on the first pawl seat 4, and when the first friction cam 5 rotates relative to the first pawl seat 4 to the second limited angle position, the first pawl seat 4 and the first ratchet 2 are separated under the action of the first friction cam 5, the first return spring 3, and the first pawl 1. The first ratchet 2 and the first pawl seat 4 are respectively connected to the external components.

[0008] Alternatively, the pawl includes a first pawl 1. The ratchet includes a first ratchet 2. The return spring includes a first return spring 3. The pawl seat includes a first pawl seat 4. The friction cam includes a first friction cam 5. The first friction cam 5 is disposed on the first pawl seat 4, and interacts with the first ratchet 2 through friction. Under the friction of the first ratchet 2, the first friction cam 5 is rotatable relative to the first pawl seat 4 between a first defined angular position and a second defined angular position. The first return spring 3 is connected to the first pawl 1. When the first friction cam 5 is disposed on the first pawl seat 4, the first pawl 1 is disposed on the first friction cam 5, and the first pawl seat 4 is connected to the first pawl 1. Within a certain angular range, the first pawl 1 is rotatable relative to the first friction cam 5. When the first friction cam 5 is disposed on the first pawl seat 4, and when the first friction cam 5 rotates relative to the first pawl seat 4 to the first defined angular position, under the action of the first friction cam 5, the first return spring 3, and the first pawl 1, the first pawl seat 4 and the first ratchet 2 selectively engage. When the first friction cam 5 is mounted on the first pawl seat 4, and when the first friction cam 5 rotates relative to the first pawl seat 4 to the second defined angle position, under the action of the first friction cam 5, the first return spring 3, and the first pawl 1, the first pawl seat 4 is separated from the first ratchet 2. The first ratchet 2 and the first pawl seat 4 are respectively connected to the external components.

[0009] Furthermore, when the friction cam is disposed on the ratchet, under the elastic force of the spring or the elastic force of the elastic structure, the friction cam interacts with the ratchet seat through friction.

[0010] Furthermore, when the friction cam is disposed on the ratchet, and when the friction cam rotates relative to the ratchet to the first defined angular position, the ratchet provides angular positioning for the friction cam. When the friction cam is disposed on the ratchet, and when the friction cam rotates relative to the ratchet to the second defined angular position, the ratchet provides angular positioning for the friction cam. When the friction cam is disposed on the pawl seat, and when the friction cam rotates relative to the pawl seat to the first defined angular position, the pawl seat provides angular positioning for the friction cam. When the friction cam is disposed on the pawl seat, and when the friction cam rotates relative to the pawl seat to the second defined angular position, the pawl seat provides angular positioning for the friction cam.

[0011] Furthermore, when the friction cam is disposed on the ratchet, the friction cam is rotatably disposed on the ratchet via a clearance fit through a shaft hole, or the friction cam is rotatably disposed on the ratchet via a bearing. When the friction cam is disposed on the pawl seat, the friction cam is rotatably disposed on the pawl seat via a clearance fit through a shaft hole, or the friction cam is rotatably disposed on the pawl seat via a bearing.

[0012] Furthermore, when the pawl is mounted on the pawl seat, the pawl is rotatably mounted on the pawl seat via a clearance fit through a shaft hole, or the pawl is rotatably mounted on the pawl seat via a bearing. When the pawl is mounted on the friction cam, the pawl is rotatably mounted on the friction cam via a clearance fit through a shaft hole, or the pawl is rotatably mounted on the friction cam via a bearing.

[0013] Further, the pawl includes one or more components. The ratchet includes one or more components. The return spring includes one or more components. The pawl seat includes one or more components. The friction cam includes one or more components. The first pawl 1 includes one or more components. The first ratchet 2 includes one or more components. The first return spring 3 includes one or more components. The first pawl seat 4 includes one or more components. The first friction cam 5 includes one or more components.

[0014] Compared with the prior art, the ratchet clutch with friction cam of this utility model can reduce the running noise between the pawl and the ratchet when it is in the disengaged state.

[0015] The above-mentioned features and advantages of the present invention, as well as other features and advantages, will be readily apparent from the following detailed description of the best mode for carrying out the present invention in conjunction with the accompanying drawings. However, it should be clearly understood that all the drawings are for description only and not for any limitation on the definition and scope of the present invention. Attached Figure Description

[0016] Figures 1-36 These are schematic diagrams of the structures in Examples 1 to 5. Wherein:

[0017] Figure 1 - 3D structural diagram of Example 1 in the joined state.

[0018] Figure 2 - Schematic diagram of the 3D cross-section structure of Example 1 in the joined state and a partially enlarged schematic diagram.

[0019] Figure 3 - 3D exploded view of the structure in the joined state (two perspectives) in Example 1.

[0020] Figure 4 - Example 1: Front view and enlarged partial schematic diagram in the joined state.

[0021] Figure 5 - A radial section diagram and a partially enlarged diagram of Example 1 in the joined state.

[0022] Figure 6 -Example 1: Partial 3D cross-sectional view and partial enlarged view in the joined state.

[0023] Figure 7 - Example 1: Front view and enlarged partial schematic diagram in the separated state.

[0024] Figure 8 - Schematic diagram of radial section and partial enlarged view of Example 1 in the separated state.

[0025] Figure 9 -Example 1: A partial 3D cross-sectional view and a partial enlarged view in the separated state.

[0026] Figure 10 - 3D structural diagram of Example 2 in the joined state.

[0027] Figure 11 - 3D cross-sectional structure diagram and partial enlarged diagram of Example 2 in the joined state.

[0028] Figure 12 - Example 2: 3D structure explosion diagram in the joined state (two perspectives).

[0029] Figure 13 -Example 2: Partial 3D cross-sectional view and partial enlarged view in the joined state.

[0030] Figure 14 - Schematic diagram of axial section and partial enlarged view of Example 2 in the separated state.

[0031] Figure 15 -Example 2: A partial 3D cross-sectional view and a partial enlarged view in the separated state.

[0032] Figure 16 - 3D structural diagram of Example 3 in the joined state.

[0033] Figure 17 - 3D cross-sectional structure diagram and partial enlarged diagram of Example 3 in the joined state.

[0034] Figure 18 - Example 3: 3D structure explosion diagram in the joined state (two perspectives).

[0035] Figure 19 - Example 3: Front view and enlarged partial schematic diagram in the joined state.

[0036] Figure 20 - Schematic diagram of radial section and partial enlarged view of Example 3 in the joined state.

[0037] Figure 21 - Example 3: Front view and enlarged partial schematic diagram in the separated state.

[0038] Figure 22 - Schematic diagram of radial section and partial enlargement of Example 3 in the separated state.

[0039] Figure 23 - 3D structural diagram of Example 4 in the joined state.

[0040] Figure 24 - Schematic diagram of the 3D cross-section structure in the joined state and a partially enlarged schematic diagram of Example 4.

[0041] Figure 25 - Example 4: 3D structural explosion diagram in the joined state (two perspectives).

[0042] Figure 26 - Example 4: Front view and enlarged partial schematic diagram in the joined state.

[0043] Figure 27 - Schematic diagram of radial section and partial enlarged view of Example 4 in the joined state.

[0044] Figure 28 - Example 4: Front view and enlarged partial schematic diagram in the separated state.

[0045] Figure 29 - Schematic diagram of radial section and partial enlargement of Example 4 in the separated state.

[0046] Figure 30 - 3D structural schematic diagram and partial enlarged schematic diagram of Example 5 in the joined state.

[0047] Figure 31 - 3D cross-sectional structure diagram and partial enlarged diagram of Example 5 in the joined state.

[0048] Figure 32 - Example 5: 3D structural explosion diagram (two perspectives) and partial magnified diagram in the joined state.

[0049] Figure 33 - Example 5: Front view and enlarged partial schematic diagram in the joined state.

[0050] Figure 34 - Schematic diagram of radial section and partial enlarged view of Example 5 in the joined state.

[0051] Figure 35 - Example 5: Front view and enlarged partial schematic diagram in the separated state.

[0052] Figure 36 - Schematic diagram of radial section and partial enlargement of Example 5 in the separated state.

[0053] Explanation of markings in the diagram: 1-First pawl, 2-First ratchet, 3-First return spring, 4-First pawl seat, 5-First friction cam, 8-First preload spring, 9-First rivet, 10-Second rivet, 12-Radial tooth of first friction cam 5, 13-Radial tooth groove of first ratchet 2, 14-Groove of first pawl seat 4, 15-Groove of first pawl 1, 16-Ratchet groove of first ratchet 2, 17-Axial groove of first friction cam 5, 18-Tooth surface of first ratchet 2, 19-Tooth surface of first friction cam 5, 20-First friction cam 5 21-Axial boss of the first ratchet 2, 22-Riveting boss of the first pawl 1, 23-Radial groove of the first friction cam 5, 24-Stop arm of the first pawl 1, 25-Radial tooth groove of the first pawl seat 4, 26-Elastic structure of the first pawl seat 4, 27-First friction pad, 28-Axial boss of the first pawl seat 4, 29-First positioning boss, 30-First positioning groove, 31-Second positioning groove, 51-First cam support, 52-Second cam support, 53-Radial tooth of the first cam support 51, F-External axial pressure.

[0054] For ease of description, the rotation direction indicated by the arrow in the figure is the forward rotation direction used in the corresponding embodiment. Detailed Implementation

[0055] The present invention will be further described below with reference to the accompanying drawings and embodiments, but the present invention is not limited to the embodiments described. Obviously, what is described is only a part of the preferred embodiments of the present invention, and not all of the embodiments. Those skilled in the art can easily make many changes based on the principles of the invention, therefore the present invention is not fixed to the details shown and described, but is intended to include all variations and modifications within the scope of the claims.

[0056] The terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. The singular forms “a,” “an,” etc., used herein may also be intended to include the plural forms unless the context clearly indicates otherwise. The terms “comprising” and “having” are inclusive and therefore specify the presence of the stated features, integrals, steps, operations, parts, components, parts, and / or assemblies, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, parts, components, assemblies, and / or combinations thereof. The method steps, procedures, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or described, unless specifically identified as such. It should also be understood that additional or alternative steps may be employed.

[0057] While the terms first, second, third, etc., may be used herein to describe various parts, components, parts, assemblies, layers, and / or portions, these parts, components, parts, assemblies, layers, and / or portions should not be limited by these terms. These terms may be used only to distinguish a single part, component, part, assembly, layer, and / or portion. Terms such as “first,” “second,” “third,” and other numerical terms used herein do not imply any order or sequence unless the context clearly indicates otherwise.

[0058] In the embodiments, “axial” refers to the axial direction of the ratchet clutch with friction cam, and “radial” refers to the radial direction of the ratchet clutch with friction cam, unless the context clearly indicates otherwise.

[0059] Example 1

[0060] A ratchet clutch equipped with a friction cam, such as Figures 1-9 As shown, it includes a first pawl 1, a first ratchet 2, a first return spring 3, a first pawl seat 4, a first friction cam 5, a first preload spring 8, and a first rivet 9.

[0061] The first ratchet 2 and the first friction cam 5 are both coaxially arranged with the first pawl seat 4. The first ratchet 2 and the first pawl seat 4 are respectively connected to external components (not shown, the external components refer to components excluding the "ratchet clutch with friction cam") via splines. Optionally, to ensure a certain degree of coaxiality between the first ratchet 2 and the first pawl seat 4, the first ratchet 2 can also be rotatably mounted on the first pawl seat 4 via bearings (see Chinese Utility Model Patent Application No. 2021100587947).

[0062] The first friction cam 5 is mounted on the first ratchet 2 via a clearance fit through a shaft hole, and the first friction cam 5 is rotatable relative to the first ratchet 2. Optionally, to reduce the frictional resistance of the first friction cam 5, the first friction cam 5 can also be rotatably mounted on the first ratchet 2 via a bearing (see Chinese Utility Model Patent Application No. 2021100587947). The radial teeth 12 of the first friction cam 5 engage with the radial tooth grooves 13 of the first ratchet 2, thereby allowing the first friction cam 5 to rotate relative to the first ratchet 2 between a first defined angular position and a second defined angular position.

[0063] The first preload spring 8 has a certain elasticity. Under the elastic pressure of the first preload spring 8, the first preload spring 8 interacts with the first friction cam 5 through friction. Optionally, to reduce wear or increase friction, a friction pad can also be provided between the first preload spring 8 and the first friction cam 5, that is, the first preload spring 8 interacts with the first friction cam 5 through the friction of the friction pad. The first preload spring 8 is mounted on the first pawl seat 4 via the first rivet 9. Thus, the first pawl seat 4 interacts with the first friction cam 5 through the friction of the first preload spring 8. That is, through the friction between the first preload spring 8 and the first friction cam 5, an indirect interaction occurs between the first pawl seat 4 and the first friction cam 5. Furthermore, when the first friction cam 5 rotates relative to the first ratchet 2 between the first defined angular position and the second defined angular position, in a manner known by technology (e.g., reasonable design or reasonable selection of the friction coefficient between different friction surfaces), the frictional effect of the first preload spring 8 on the first friction cam 5 is greater than the resistance effect of other components on the first friction cam 5. Thus, under the frictional action of the first preload spring 8, the first friction cam 5 can rotate relative to the first ratchet 2 between the first limited angular position and the second limited angular position. Under the elastic pressure of the first preload spring 8, the first friction cam 5 is fixed axially relative to the first ratchet 2.

[0064] The first return spring 3 has a certain degree of elasticity. Under the elastic force of the first return spring 3, the first pawl 1 is disposed on the first pawl seat 4 through a clearance fit with the shaft hole, and the first pawl 1 can rotate relative to the first pawl seat 4 within a certain angle range. The first return spring 3 is disposed in the groove 14 of the first pawl seat 4 and in the groove 15 of the first pawl 1, so that under the action of the first return spring 3, the first pawl 1 is fixed axially relative to the first pawl seat 4.

[0065] The first friction cam 5 interacts with the first pawl 1 through contact. Under the frictional action of the first preload spring 8, when the first friction cam 5 rotates relative to the first ratchet 2 to the first limited angle position, the first pawl seat 4 selectively engages and disengages from the first ratchet 2 under the action of the first return spring 3, the first pawl 1, and the first friction cam 5. At this time, the first pawl seat 4 selectively transmits its power or movement to the first ratchet 2, or the first ratchet 2 selectively transmits its power or movement to the first pawl seat 4. Under the frictional action of the first preload spring 8, when the first friction cam 5 rotates relative to the first ratchet 2 to the second limited angle position, the first pawl seat 4 is disengaged from the first ratchet 2 under the action of the first return spring 3, the first pawl 1, and the first friction cam 5.

[0066] Preferably, in the initial state, the first friction cam 5 is positioned at the first defined angle relative to the first ratchet 2, and the first pawl seat 4 is engaged with the first ratchet 2, such as... Figures 1-6 As shown. At this time, in the reverse direction (opposite to the rotation direction indicated by the arrow in the figure), the first ratchet 2 is fixed relative to the first pawl seat 4. When the first ratchet 2 rotates clockwise relative to the first pawl seat 4 (rotation direction indicated by the arrow in the figure), under the frictional action of the first preload spring 8, the first friction cam 5 can rotate relative to the first ratchet 2 to the second limited angle position.

[0067] like Figures 7-9As shown, when the first friction cam 5 rotates relative to the first ratchet 2 to the second defined angle position, the first pawl seat 4 is separated from the first ratchet 2, and the first ratchet 2 can rotate relative to the first pawl seat 4 in the forward rotation direction (the rotation direction indicated by the arrow in the figure). When the first ratchet 2 rotates in the reverse direction relative to the first pawl seat 4 (opposite to the rotation direction indicated by the arrow in the figure), under the frictional action of the first preload spring 8, the first friction cam 5 can rotate relative to the first ratchet 2 to the first defined angle position.

[0068] When the first friction cam 5 rotates relative to the first ratchet 2 to the first defined angle position, and when the first ratchet 2 reverses or has a tendency to reverse relative to the first pawl seat 4, the first pawl seat 4 selectively engages with the first ratchet 2, and the first ratchet 2 can be fixed relative to the first pawl seat 4 in the reversing direction. Figure 6 As shown, when the first friction cam 5 rotates relative to the first ratchet 2 to the first defined angle position, and when the first ratchet 2 reverses or has a tendency to reverse motion relative to the first pawl seat 4, and when the first pawl seat 4 and the first ratchet 2 are in an engaged state, the ratchet groove 16 of the first ratchet 2 and the axial groove 17 of the first friction cam 5 are engaged with the first pawl 1, and the first ratchet 2 and the first friction cam 5 are fixed relative to the first pawl seat 4 in the reversing direction.

[0069] When the first friction cam 5 rotates relative to the first ratchet 2 to the second defined angle position, and when the first ratchet 2 rotates clockwise relative to the first pawl seat 4, such as Figure 9 As shown, the tooth tip surface 19 of the first friction cam 5 and the tooth tip surface 18 of the first ratchet 2 are axially joined to form a cylindrical surface. The first pawl 1 contacts the joined cylindrical surface, thereby avoiding continuous impact between the pawl and the ratchet. Although there is frictional noise between the pawl and the joined cylindrical surface, and also between the first friction cam 5 and the first preload spring 8, the former (frictional noise between friction pairs) is significantly lower than the latter (continuous impact noise between the pawl and the ratchet) compared to the continuous impact noise generated between the pawl and the ratchet in the disengaged state of a traditional ratchet one-way clutch.

[0070] The first friction cam 5 and the first preload spring 8 interact through friction, and after prolonged operation, some wear is inevitable. However, because the first preload spring 8 has a certain elastic deformation capacity, the contact pressure between the first friction cam 5 and the first preload spring 8 can be stably maintained within a certain range within a certain service life. Furthermore, it can compensate for some wear between the first friction cam 5 and the first preload spring 8, thereby ensuring relatively stable friction between the first friction cam 5 and the first preload spring 8 within a certain service life.

[0071] Example 2

[0072] A ratchet clutch equipped with a friction cam, such as Figures 10-15 As shown, it includes a first pawl 1, a first ratchet 2, a first return spring 3, a first pawl seat 4, and a first friction cam 5.

[0073] The first ratchet 2 and the first friction cam 5 are both coaxially arranged with the first pawl seat 4. The first ratchet 2 and the first pawl seat 4 are respectively connected to external components (not shown, the external components refer to components excluding the "ratchet clutch with friction cam") via splines. Optionally, to ensure a certain positional degree between the first ratchet 2 and the first pawl seat 4, the first ratchet 2 can also be rotatably mounted on the first pawl seat 4 via bearings (see Chinese Utility Model Patent Application No. 2021100587947).

[0074] The first friction cam 5 is mounted on the first ratchet 2 via a clearance fit through a shaft hole, and the first friction cam 5 is rotatable relative to the first ratchet 2. Optionally, to reduce the frictional resistance of the first friction cam 5, the first friction cam 5 can also be rotatably mounted on the first ratchet 2 via a bearing (see Chinese Utility Model Patent Application No. 2021100587947). The radial teeth 12 of the first friction cam 5 engage with the axial boss 21 of the first ratchet 2, thereby allowing the first friction cam 5 to rotate relative to the first ratchet 2 between a first defined angular position and a second defined angular position.

[0075] like Figure 10 As shown in the diagram, the external axial pressure F on the left and right sides acts on the first ratchet seat 4 and the first ratchet 2, respectively. Figure 11As shown, in the axial direction, the first friction cam 5 interacts with the first ratchet 2 through contact, and the axial boss 20 of the first friction cam 5 interacts with the first pawl seat 4 through contact. Therefore, when the first friction cam 5 rotates relative to the first pawl seat 4, or when the first friction cam 5 has a rotational tendency relative to the first pawl seat 4, under the action of the external axial pressure F on both sides, the axial boss 20 of the first friction cam 5 interacts with the first pawl seat 4 through friction. Optionally, to reduce wear or increase friction, a friction pad can also be provided between the axial boss 20 of the first friction cam 5 and the first friction cam 5, that is, the axial boss 20 of the first friction cam 5 interacts with the first friction cam 5 through the friction of the friction pad. Optionally, to improve reliability, a spring or elastic structure can also be provided between the axial boss 20 of the first friction cam 5 and the first friction cam 5, that is, the axial boss 20 of the first friction cam 5 interacts with the first friction cam 5 through a spring or elastic structure. Furthermore, when the first friction cam 5 rotates relative to the first ratchet 2 between the first defined angular position and the second defined angular position, in a manner known by technology (e.g., by reasonable design or reasonable selection of the friction coefficient between different friction surfaces), the frictional effect of the first pawl seat 4 on the first friction cam 5 is greater than the resistance effect of other components on the first friction cam 5. Thus, under the frictional action of the first pawl seat 4, the first friction cam 5 can rotate relative to the first ratchet 2 between the first defined angular position and the second defined angular position. Under the contact pressure of the first pawl seat 4, the first friction cam 5 is fixed axially relative to the first ratchet 2.

[0076] The first return spring 3 has a certain elasticity. Under the elastic force of the first return spring 3, the first pawl 1 is disposed on the first pawl seat 4 through a clearance fit with the shaft hole, and the first pawl 1 can rotate relative to the first pawl seat 4 within a certain angle range. Under the action of the riveting boss 22 of the first pawl 1, the first pawl 1 is fixed relative to the first pawl seat 4 in the radial direction.

[0077] The first friction cam 5 interacts with the first pawl 1 through contact. Under the frictional action of the first pawl seat 4, when the first friction cam 5 rotates relative to the first ratchet 2 to the first limited angle position, the first pawl seat 4 and the first ratchet 2 selectively engage and disengage under the action of the first return spring 3, the first pawl 1, and the first friction cam 5. At this time, the first pawl seat 4 selectively transmits its power or movement to the first ratchet 2, or the first ratchet 2 selectively transmits its power or movement to the first pawl seat 4. Under the frictional action of the first pawl seat 4, when the first friction cam 5 rotates relative to the first ratchet 2 to the second limited angle position, the first pawl seat 4 and the first ratchet 2 are in a disengaged state under the action of the first return spring 3, the first pawl 1, and the first friction cam 5.

[0078] Preferably, in the initial state, the first friction cam 5 is positioned at the first defined angle relative to the first ratchet 2, and the first pawl seat 4 is engaged with the first ratchet 2, such as... Figures 10-13 As shown. At this time, in the reverse direction (opposite to the rotation direction indicated by the arrow in the figure), the first ratchet 2 is fixed relative to the first pawl seat 4. When the first ratchet 2 rotates clockwise relative to the first pawl seat 4 (rotation direction indicated by the arrow in the figure), under the friction of the first pawl seat 4, the first friction cam 5 can rotate relative to the first ratchet 2 to the second limited angle position.

[0079] like Figures 14-15 As shown, when the first friction cam 5 rotates relative to the first ratchet 2 to the second defined angle position, the first pawl seat 4 is separated from the first ratchet 2, and the first ratchet 2 can rotate relative to the first pawl seat 4 in the forward rotation direction (the rotation direction indicated by the arrow in the figure). When the first ratchet 2 rotates in the reverse direction relative to the first pawl seat 4 (opposite to the rotation direction indicated by the arrow in the figure), under the friction of the first pawl seat 4, the first friction cam 5 can rotate relative to the first ratchet 2 to the first defined angle position.

[0080] When the first friction cam 5 rotates relative to the first ratchet 2 to the first defined angle position, and when the first ratchet 2 reverses or has a tendency to reverse relative to the first pawl seat 4, the first pawl seat 4 selectively engages with the first ratchet 2, and the first ratchet 2 can be fixed relative to the first pawl seat 4 in the reversing direction. Figure 13As shown, when the first friction cam 5 rotates relative to the first ratchet 2 to the first defined angle position, and when the first ratchet 2 reverses or has a tendency to reverse motion relative to the first pawl seat 4, and when the first pawl seat 4 and the first ratchet 2 are in an engaged state, the ratchet groove 16 of the first ratchet 2 and the radial groove 23 of the first friction cam 5 are engaged with the first pawl 1, and the first ratchet 2 and the first friction cam 5 are fixed relative to the first pawl seat 4 in the reversing direction.

[0081] When the first friction cam 5 rotates relative to the first ratchet 2 to the second defined angle position, and when the first ratchet 2 rotates clockwise relative to the first pawl seat 4, such as Figure 15 As shown, the tooth tip surface 19 of the first friction cam 5 and the tooth tip surface 18 of the first ratchet 2 are radially joined to form a plane, and the first pawl 1 contacts the joined plane, thereby avoiding continuous impact between the pawl and the ratchet. Although there is frictional noise between the pawl and the joined plane, and frictional noise between the first pawl seat 4 and the axial boss 20 of the first friction cam 5, the former (frictional noise between friction pairs) is significantly lower than the latter (continuous impact noise between the pawl and the ratchet) compared to the continuous impact noise generated between the pawl and the ratchet in the disengaged state of a traditional ratchet one-way clutch.

[0082] Example 3

[0083] A ratchet clutch equipped with a friction cam, such as Figures 16-22 As shown, it includes a first pawl 1, a first ratchet 2, a first return spring 3, a first pawl seat 4, a first friction cam 5, a first preload spring 8, and a first rivet 9.

[0084] The first ratchet 2 and the first friction cam 5 are both coaxially arranged with the first pawl seat 4. The first ratchet 2 and the first pawl seat 4 are respectively connected to external components (not shown, the external components refer to components excluding the "ratchet clutch with friction cam") via splines. Optionally, to ensure a certain degree of coaxiality between the first ratchet 2 and the first pawl seat 4, the first ratchet 2 can also be rotatably mounted on the first pawl seat 4 via bearings (see Chinese Utility Model Patent Application No. 2021100587947).

[0085] The first friction cam 5 is mounted on the first pawl seat 4 via a clearance fit through a shaft hole, and the first friction cam 5 is rotatable relative to the first pawl seat 4. Optionally, to reduce the frictional resistance of the first friction cam 5, the first friction cam 5 can also be rotatably mounted on the first pawl seat 4 via a bearing (see Chinese Utility Model Patent Application No. 2021100587947). The radial protrusion 12 of the first friction cam 5 engages with the radial groove 25 of the first pawl seat 4, thereby allowing the first friction cam 5 to rotate relative to the first pawl seat 4 between a first defined angular position and a second defined angular position.

[0086] The first preload spring 8 has a certain elasticity. Under the elastic pressure of the first preload spring 8, the first preload spring 8 interacts with the first ratchet 2 through friction. Optionally, to reduce wear or increase friction, a friction pad can also be provided between the first preload spring 8 and the first ratchet 2, that is, the first preload spring 8 interacts with the first ratchet 2 through the friction of the friction pad. The first preload spring 8 is mounted on the first friction cam 5 via the first rivet 9. Thus, through the friction between the first preload spring 8 and the first ratchet 2, an indirect interaction occurs between the first ratchet 2 and the first friction cam 5. Furthermore, when the first friction cam 5 rotates relative to the first pawl seat 4 between the first limited angle position and the second limited angle position, in a manner known by technology (e.g., reasonable design or reasonable selection of the friction coefficient between different friction surfaces), the frictional effect of the first ratchet 2 on the first preload spring 8 is greater than the resistance effect of other components on the first friction cam 5. Thus, under the frictional action of the first ratchet 2, the first preload spring 8 drives the first friction cam 5, thereby allowing the first friction cam 5 to rotate relative to the first pawl seat 4 between the first limited angle position and the second limited angle position. Under the action of the stop arm 24 of the first pawl 1, the first friction cam 5 is fixed axially relative to the first pawl seat 4.

[0087] The first return spring 3 has a certain degree of elasticity. Under the elastic force of the first return spring 3, the first pawl 1 is disposed on the first pawl seat 4 through a clearance fit with the shaft hole, and the first pawl 1 can rotate relative to the first pawl seat 4 within a certain angle range. The first return spring 3 is disposed in the groove 14 of the first pawl seat 4 and in the groove 15 of the first pawl 1, so that under the action of the first return spring 3, the first pawl 1 is fixed axially relative to the first pawl seat 4.

[0088] The first friction cam 5 interacts with the first pawl 1 through contact. Under the frictional action of the first ratchet 2, the first preload spring 8 drives the first friction cam 5, thereby causing the first friction cam 5 to rotate relative to the first pawl seat 4. When the first friction cam 5 rotates relative to the first pawl seat 4 to the first limited angle position, under the action of the first return spring 3, the first pawl 1, and the first friction cam 5, the first pawl seat 4 and the first ratchet 2 selectively engage and disengage. At this time, the first pawl seat 4 selectively transmits its power or movement to the first ratchet 2, or the first ratchet 2 selectively transmits its power or movement to the first pawl seat 4. When the first friction cam 5 rotates relative to the first pawl seat 4 to the second limited angle position, under the action of the first return spring 3, the first pawl 1, and the first friction cam 5, the first pawl 1 disengages from the first ratchet 2, and the first pawl seat 4 is in a separated state from the first ratchet 2.

[0089] Preferably, in the initial state, the first friction cam 5 is positioned at the first defined angle relative to the first pawl seat 4, and the first pawl seat 4 is engaged with the first ratchet 2, such as... Figures 16-20 As shown. At this time, in the reverse direction (opposite to the rotation direction indicated by the arrow in the figure), the first ratchet 2 is fixed relative to the first pawl seat 4. When the first ratchet 2 rotates clockwise relative to the first pawl seat 4 (rotation direction indicated by the arrow in the figure), under the friction of the first ratchet 2, the first preload spring 8 drives the first friction cam 5, and the first friction cam 5 can rotate relative to the first pawl seat 4 to the second limited angle position.

[0090] like Figures 21-22 As shown, when the first friction cam 5 rotates relative to the first pawl seat 4 to the second limited angle position, the first pawl 1 disengages from the first ratchet 2, and the first pawl seat 4 is separated from the first ratchet 2. In the forward rotation direction (the rotation direction indicated by the arrow in the figure), the first ratchet 2 can rotate relative to the first pawl seat 4. When the first ratchet 2 rotates in the reverse direction relative to the first pawl seat 4 (opposite to the rotation direction indicated by the arrow in the figure), under the friction of the first ratchet 2, the first preload spring 8 drives the first friction cam 5, thereby allowing the first friction cam 5 to rotate relative to the first pawl seat 4 to the first limited angle position.

[0091] When the first friction cam 5 rotates relative to the first pawl seat 4 to the first defined angle position, and when the first ratchet 2 reverses or has a tendency to reverse relative to the first pawl seat 4, the first pawl seat 4 and the first ratchet 2 selectively engage, and the first ratchet 2 can be fixed relative to the first pawl seat 4 in the reversing direction. Figures 19-20 As shown, when the first pawl seat 4 and the first ratchet 2 are engaged, the first ratchet 2 is fixed relative to the first pawl seat 4 in the reverse direction.

[0092] When the first friction cam 5 rotates relative to the first pawl seat 4 to the second limited angle position, and when the first ratchet 2 rotates clockwise relative to the first pawl seat 4, such as Figures 21-22 As shown, the first pawl 1 disengages from the first ratchet 2, thus preventing continuous impact between the pawl and the ratchet. Although frictional noise still exists between the first ratchet 2 and the first preload spring 8 at this time, it is significantly lower than the continuous impact noise generated between the pawl and the ratchet in the disengaged state of a traditional ratchet one-way clutch (frictional noise between friction pairs) compared to the latter (continuous impact noise between the pawl and the ratchet between the engaging pairs).

[0093] The first ratchet 2 and the first preload spring 8 interact through friction, and after prolonged operation, some wear is inevitable. However, because the first preload spring 8 has a certain elastic deformation capacity, the contact pressure between the first ratchet 2 and the first preload spring 8 can be stably maintained within a certain range within a certain service life. Furthermore, it can compensate for some wear between the first ratchet 2 and the first preload spring 8, thereby ensuring relatively stable friction between the first ratchet 2 and the first preload spring 8 within a certain service life.

[0094] Example 4

[0095] A ratchet clutch equipped with a friction cam, such as Figures 23-29 As shown, it includes a first pawl 1, a first ratchet 2, a first return spring 3, a first pawl seat 4, and a first friction cam 5.

[0096] The first ratchet 2 and the first friction cam 5 are both coaxially arranged with the first pawl seat 4. The first ratchet 2 and the first pawl seat 4 are respectively connected to external components (not shown, the external components refer to components excluding the "ratchet clutch with friction cam") via splines. Optionally, to ensure a certain degree of coaxiality between the first ratchet 2 and the first pawl seat 4, the first ratchet 2 can also be rotatably mounted on the first pawl seat 4 via bearings (see Chinese Utility Model Patent Application No. 2021100587947).

[0097] The first friction cam 5 is mounted on the first ratchet 2 via a clearance fit through a shaft hole, and the first friction cam 5 is rotatable relative to the first ratchet 2. Optionally, to reduce the frictional resistance of the first friction cam 5, the first friction cam 5 can also be rotatably mounted on the first ratchet 2 via a bearing (see Chinese Utility Model Patent Application No. 2021100587947). The radial teeth 12 of the first friction cam 5 engage with the radial tooth grooves 13 of the first ratchet 2, thereby allowing the first friction cam 5 to rotate relative to the first ratchet 2 between a first defined angular position and a second defined angular position.

[0098] The elastic structure 26 of the first pawl seat 4 has a certain elastic deformation capability. Under the elastic pressure of the elastic structure 26 of the first pawl seat 4, the first pawl seat 4 interacts with the first friction cam 5 through friction. Optionally, to reduce wear or increase friction, a friction pad can also be provided between the elastic structure 26 of the first pawl seat 4 and the first friction cam 5, that is, the elastic structure 26 of the first pawl seat 4 interacts with the first friction cam 5 through the friction of the friction pad. Furthermore, when the first friction cam 5 rotates relative to the first ratchet 2 between the first limited angle position and the second limited angle position, in a manner known by technology (e.g., reasonable design or reasonable selection of the friction coefficient between different friction surfaces), the frictional effect of the elastic structure 26 of the first pawl seat 4 on the first friction cam 5 is greater than the resistance effect of other components on the first friction cam 5. Thus, under the frictional action of the elastic structure 26 of the first pawl seat 4, the first friction cam 5 can rotate relative to the first ratchet 2 between the first limited angle position and the second limited angle position. Under the elastic pressure of the elastic structure 26 of the first pawl seat 4, the first friction cam 5 is fixed relative to the first ratchet 2 in the axial direction.

[0099] The first return spring 3 has a certain elasticity. Under the elastic force of the first return spring 3, the first pawl 1 is rotatably mounted on the first pawl seat 4 through a clearance fit with the shaft hole, and within a certain angle range, the first pawl 1 can rotate relative to the first pawl seat 4. The first return spring 3 is disposed in the groove 14 of the first pawl seat 4 and in the groove 15 of the first pawl 1, so that under the action of the first return spring 3, the first pawl 1 is fixed axially relative to the first pawl seat 4.

[0100] The first friction cam 5 interacts with the first pawl 1 through contact. Under the frictional action of the elastic structure 26 of the first pawl seat 4, when the first friction cam 5 rotates relative to the first ratchet 2 to the first limited angle position, the first pawl seat 4 and the first ratchet 2 selectively engage and disengage under the action of the first return spring 3, the first pawl 1, and the first friction cam 5. At this time, the first pawl seat 4 selectively transmits its power or movement to the first ratchet 2, or the first ratchet 2 selectively transmits its power or movement to the first pawl seat 4. Under the frictional action of the elastic structure 26 of the first pawl seat 4, when the first friction cam 5 rotates relative to the first ratchet 2 to the second limited angle position, the first pawl seat 4 and the first ratchet 2 are in a disengaged state under the action of the first return spring 3, the first pawl 1, and the first friction cam 5.

[0101] Preferably, in the initial state, the first friction cam 5 is positioned at the first defined angle relative to the first ratchet 2, and the first pawl seat 4 is engaged with the first ratchet 2, such as... Figures 23-27 As shown. At this time, in the reverse direction (opposite to the rotation direction indicated by the arrow in the figure), the first ratchet 2 is fixed relative to the first pawl seat 4. When the first ratchet 2 rotates clockwise relative to the first pawl seat 4 (rotation direction indicated by the arrow in the figure), under the frictional action of the elastic structure 26 of the first pawl seat 4, the first friction cam 5 can rotate relative to the first ratchet 2 to the second limited angle position.

[0102] like Figures 28-29As shown, when the first friction cam 5 rotates relative to the first ratchet 2 to the second defined angle position, the first pawl seat 4 is separated from the first ratchet 2, and the first ratchet 2 can rotate relative to the first pawl seat 4 in the forward rotation direction (the rotation direction indicated by the arrow in the figure). When the first ratchet 2 rotates in the reverse direction relative to the first pawl seat 4 (opposite to the rotation direction indicated by the arrow in the figure), under the frictional action of the elastic structure 26 of the first pawl seat 4, the first friction cam 5 can rotate relative to the first ratchet 2 to the first defined angle position.

[0103] Similar to Embodiment 1, when the first friction cam 5 rotates relative to the first ratchet 2 to the first defined angle position, and when the first ratchet 2 reverses relative to the first pawl seat 4 or has a tendency to reverse motion, the ratchet groove 16 of the first ratchet 2 and the axial groove 17 of the first friction cam 5 can engage with the first pawl 1, and the first ratchet 2 and the first friction cam 5 can be fixed relative to the first pawl seat 4 in the reversing direction.

[0104] Similar to Embodiment 1, when the first friction cam 5 rotates relative to the first ratchet 2 to the second defined angle position, and when the first ratchet 2 rotates clockwise relative to the first pawl seat 4, the tooth tip surface 19 of the first friction cam 5 and the tooth tip surface 18 of the first ratchet 2 axially merge into a cylindrical surface. The first pawl 1 contacts the merged cylindrical surface, thereby avoiding continuous impact between the pawl and the ratchet. Although there is frictional noise between the pawl and the merged cylindrical surface, and frictional noise between the first friction cam 5 and the elastic structure 26 of the first pawl seat 4, the former (frictional noise between friction pairs) is significantly lower than the latter (continuous impact noise between the pawl and the ratchet) compared to the continuous impact noise generated between the pawl and the ratchet in the disengaged state of a traditional ratchet one-way clutch.

[0105] The first friction cam 5 and the elastic structure 26 of the first pawl seat 4 interact through friction, and after long-term operation, some wear is inevitable. However, since the elastic structure 26 of the first pawl seat 4 has a certain elastic deformation capability, the contact pressure between the first friction cam 5 and the elastic structure 26 of the first pawl seat 4 can be stably maintained within a certain range within a certain service time. Furthermore, it can compensate for the wear between the first friction cam 5 and the elastic structure 26 of the first pawl seat 4 to a certain extent, thereby ensuring a relatively stable frictional effect between the first friction cam 5 and the elastic structure 26 of the first pawl seat 4 within a certain service time.

[0106] Example 5

[0107] A ratchet clutch equipped with a friction cam, such as Figures 30-36 As shown, it includes a first pawl 1, a first ratchet 2, a first return spring 3, a first pawl seat 4, a first friction cam 5, a first preload spring 8, a first rivet 9, a second rivet 10, and a first friction pad 27.

[0108] The first friction cam 5 includes a first cam support 51 and a second cam support 52. Under the action of the first pawl 1, the first cam support 51 and the second cam support 52 are connected to each other to form a whole (i.e., the first friction cam 5).

[0109] The first cam support 51 is provided with a first positioning boss 29, and the first pawl seat 4 is provided with a first positioning groove 30 and a second positioning groove 31. The number of the first positioning boss 29, the first positioning groove 30 and the second positioning groove 31 can be set according to the actual working conditions.

[0110] The first ratchet 2 and the first friction cam 5 are both coaxially arranged with the first pawl seat 4. The first ratchet 2 and the first pawl seat 4 are respectively connected to external components (not shown, the external components refer to components excluding the "ratchet clutch with friction cam") via splines. Optionally, to ensure a certain degree of coaxiality between the first ratchet 2 and the first pawl seat 4, the first ratchet 2 can also be rotatably mounted on the first pawl seat 4 via bearings (see Chinese Utility Model Patent Application No. 2021100587947).

[0111] The first cam support 51 and the axial boss 28 of the first pawl seat 4 are fitted with a clearance fit through a shaft hole, thereby allowing the first friction cam 5 to be rotatably mounted on the first pawl seat 4. Optionally, to reduce the frictional resistance of the first friction cam 5, the first cam support 51 can also be rotatably mounted on the first pawl seat 4 via a bearing (see Chinese Utility Model Patent Application No. 2021100587947). The radial teeth 53 of the first cam support 51 engage with the axial boss 28 of the first pawl seat 4, thereby allowing the first friction cam 5 to rotate relative to the first pawl seat 4 between a first defined angular position and a second defined angular position. The first cam support 51 and the second cam support 52 interact with the first pawl seat 4 through contact, and under the action of the riveting boss 22 of the first pawl 1, the first friction cam 5 is fixed axially relative to the first pawl seat 4.

[0112] The first preload spring 8 has a certain elastic deformation capacity. The first preload spring 8 is mounted on the first cam bracket 51 via the first rivet 9. The first friction pad 27 is mounted on the first preload spring 8 via the second rivet 10. Under the elastic pressure of the first preload spring 8, the first friction pad 27 interacts with the first ratchet 2 through friction. The first friction pad 27 has a certain wear resistance. Thus, through the friction between the first friction pad 27 and the first ratchet 2, an indirect interaction occurs between the first ratchet 2 and the first friction cam 5. Furthermore, when the first friction cam 5 rotates relative to the first pawl seat 4 between the first limited angle position and the second limited angle position, in a manner known by technology (e.g., reasonable design or reasonable selection of the friction coefficient between different friction surfaces), the frictional effect of the first ratchet 2 on the first friction pad 27 is greater than the resistance effect of other components on the first friction cam 5. Thus, under the frictional action of the first ratchet 2, the first friction pad 27 drives the first friction cam 5 through the first preload spring 8, thereby making the first friction cam 5 rotatable relative to the first pawl seat 4 between the first limited angle position and the second limited angle position.

[0113] The first return spring 3 has a certain elasticity. The first return spring 3 is mounted on the first cam support 51 and is connected to the first pawl 1. The first pawl 1 is mounted on the first friction cam 5 with a clearance fit through a shaft hole. Under the elastic force of the first return spring 3, the first pawl 1 can rotate relative to the first friction cam 5 within a certain angle range. Furthermore, under the action of the riveting boss 22 of the first pawl 1, the first pawl 1 is axially fixed relative to the first friction cam 5.

[0114] The first pawl seat 4 interacts with the first pawl 1 through contact. Under the friction of the first ratchet 2, the first friction pad 27 drives the first friction cam 5 through the first preload spring 8, thereby making the first friction cam 5 rotatable relative to the first pawl seat 4. When the first friction cam 5 rotates relative to the first pawl seat 4 to the first limited angle position, under the action of the first return spring 3, the first pawl 1, and the first friction cam 5, the first pawl seat 4 and the first ratchet 2 selectively engage and disengage. At this time, the first pawl seat 4 selectively transmits its power or movement to the first ratchet 2, or the first ratchet 2 selectively transmits its power or movement to the first pawl seat 4. When the first friction cam 5 rotates relative to the first pawl seat 4 to the second limited angle position, under the action of the first return spring 3, the first pawl 1, and the first friction cam 5, the first pawl 1 disengages from the first ratchet 2, and the first pawl seat 4 is in a separated state from the first ratchet 2.

[0115] Furthermore, when the first friction cam 5 is at the first defined angle position relative to the first pawl seat 4, the first pawl seat 4 provides a certain angular positioning function for the first friction cam 5 through the interaction between the first positioning boss 29 and the first positioning groove 30. Optionally, when the first friction cam 5 is at the first defined angle position relative to the first pawl seat 4, the positioning function between the first pawl seat 4 and the first friction cam 5 can also be achieved through other known methods (see Chinese Utility Model Patent Application No. 2021100587947). In this case, even with certain external interference or power impact, the first friction cam 5 remains at the first defined angle position relative to the first pawl seat 4. Therefore, through the interaction between the first positioning boss 29 and the first positioning groove 30, the ratchet clutch equipped with the friction cam has a certain shifting reliability and stability at the first defined angle position.

[0116] Similarly, when the first friction cam 5 is at the second defined angle position relative to the first pawl seat 4, the first pawl seat 4 provides a certain angular positioning function for the first friction cam 5 through the interaction between the first positioning boss 29 and the second positioning groove 31. Optionally, when the first friction cam 5 is at the second defined angle position relative to the first pawl seat 4, the positioning function between the first pawl seat 4 and the first friction cam 5 can also be achieved through other known methods (see Chinese Utility Model Patent Application No. 2021100587947). In this case, even with certain external interference or power impact, the first friction cam 5 remains at the second defined angle position relative to the first pawl seat 4. Therefore, through the interaction between the first positioning boss 29 and the second positioning groove 31, the ratchet clutch equipped with the friction cam has a certain shifting reliability and stability at the second defined angle position.

[0117] Preferably, in the initial state, the first friction cam 5 is positioned at the first defined angle relative to the first pawl seat 4, and the first pawl seat 4 is engaged with the first ratchet 2, such as... Figures 30-34 As shown. At this time, in the reverse direction (opposite to the rotation direction indicated by the arrow in the figure), the first ratchet 2 is fixed relative to the first pawl seat 4. When the first ratchet 2 rotates clockwise relative to the first pawl seat 4 (rotation direction indicated by the arrow in the figure), under the friction of the first ratchet 2, the first friction pad 27 drives the first friction cam 5 through the first preload spring 8, thereby allowing the first friction cam 5 to rotate relative to the first pawl seat 4 to the second limited angle position.

[0118] like Figures 35-36 As shown, when the first friction cam 5 rotates relative to the first pawl seat 4 to the second limited angle position, the first pawl 1 disengages from the first ratchet 2, and the first pawl seat 4 is separated from the first ratchet 2. In the forward rotation direction (the rotation direction indicated by the arrow in the figure), the first ratchet 2 can rotate relative to the first pawl seat 4. When the first ratchet 2 rotates in the reverse direction relative to the first pawl seat 4 (opposite to the rotation direction indicated by the arrow in the figure), under the friction of the first ratchet 2, the first friction pad 27 drives the first friction cam 5 through the first preload spring 8, thereby allowing the first friction cam 5 to rotate relative to the first pawl seat 4 to the first limited angle position.

[0119] When the first friction cam 5 rotates relative to the first pawl seat 4 to the first defined angle position, and when the first ratchet 2 reverses or has a tendency to reverse relative to the first pawl seat 4, the first pawl seat 4 and the first ratchet 2 selectively engage, and the first ratchet 2 can be fixed relative to the first pawl seat 4 in the reversing direction. Figures 33-34 As shown, when the first pawl seat 4 and the first ratchet 2 are engaged, the first ratchet 2 is fixed relative to the first pawl seat 4 in the reverse direction.

[0120] When the first friction cam 5 rotates relative to the first pawl seat 4 to the second limited angle position, and when the first ratchet 2 rotates clockwise relative to the first pawl seat 4, such as Figures 35-36 As shown, the first pawl 1 disengages from the first ratchet 2, thus preventing continuous impact between the pawl and the ratchet. Although frictional noise still exists between the first ratchet 2 and the first friction pad 27 at this time, it is significantly lower than the continuous impact noise generated between the pawl and the ratchet in the disengaged state of a traditional ratchet one-way clutch (frictional noise between friction pairs) compared to the latter (continuous impact noise between the pawl and the ratchet between the engaging pairs).

[0121] Although the first friction pad 27 has a certain degree of wear resistance, the first ratchet 2 and the first friction pad 27 will inevitably experience some wear after prolonged operation due to their frictional interaction. However, because the first preload spring 8 has a certain elastic deformation capacity, the contact pressure between the first ratchet 2 and the first friction pad 27 can be stably maintained within a certain range within a certain service life. Furthermore, it can compensate for some wear between the first ratchet 2 and the first friction pad 27, thereby ensuring relatively stable friction between them within a certain service life.

[0122] It should be noted that the above embodiments are illustrative of the present invention and not limiting of it, and those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. Therefore, the embodiments should be considered exemplary and non-limiting, and the scope of the present invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims. In the claims, the word "comprising" does not exclude the presence of data, steps, or components not listed in the claims.

[0123] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment includes only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A ratchet clutch with a friction cam, used to connect at least two components of a machine, device, transmission system, or mechanism, and / or to selectively engage or disengage the power or motion of the connected moving parts by means of the interaction between the pawl and the ratchet, and / or to selectively decelerate, stop, or maintain a stopped state of the connected moving parts by means of the interaction between the pawl and the ratchet, characterized in that: The ratchet clutch equipped with a friction cam includes at least: a pawl, a ratchet, a return spring, a pawl seat, and a friction cam; and / or The friction cam is directly or indirectly mounted on the ratchet; the friction cam interacts directly or indirectly with the pawl seat through friction; under the direct or indirect friction of the pawl seat, the friction cam is rotatable relative to the ratchet within a certain angle range; or the friction cam is directly or indirectly mounted on the pawl seat; the friction cam interacts directly or indirectly with the ratchet through friction; under the direct or indirect friction of the ratchet, the friction cam is rotatable relative to the pawl seat within a certain angle range; and / or The return spring is directly or indirectly connected to the pawl; and / or When the friction cam is directly or indirectly mounted on the ratchet, the pawl is directly or indirectly mounted on the pawl seat, the friction cam is directly or indirectly connected to the pawl, and the pawl is rotatable relative to the pawl seat within a certain angle range; and / or When the friction cam is directly or indirectly mounted on the pawl seat, the pawl is directly or indirectly mounted on the pawl seat, the friction cam is directly or indirectly connected to the pawl, and the pawl is rotatable relative to the pawl seat within a certain angle range; or the pawl is directly or indirectly mounted on the friction cam, the pawl seat is directly or indirectly connected to the pawl, and the pawl is rotatable relative to the friction cam within a certain angle range; and / or Under the direct or indirect action of the friction cam, the return spring, and the pawl, the pawl seat and the ratchet wheel selectively engage and disengage; and / or The ratchet and the pawl seat are respectively connected to the components of the machine, or the ratchet and the pawl seat are respectively connected to the components of the device, or the ratchet and the pawl seat are respectively connected to the components of the transmission system, or the ratchet and the pawl seat are respectively connected to the components of the mechanism.

2. The ratchet clutch with a friction cam as described in claim 1, characterized in that: The pawl includes at least a first pawl (1); and / or The ratchet includes at least a first ratchet (2); and / or The return spring includes at least a first return spring (3); and / or The pawl seat includes at least a first pawl seat (4); and / or The friction cam includes at least a first friction cam (5); and / or The first friction cam (5) is directly or indirectly disposed on the first ratchet (2). The first friction cam (5) interacts directly or indirectly with the first pawl seat (4) through friction. Under the direct or indirect friction of the first pawl seat (4), the first friction cam (5) is rotatable relative to the first ratchet (2) between a first defined angular position and a second defined angular position; and / or The first return spring (3) is directly or indirectly connected to the first pawl (1); and / or When the first friction cam (5) is directly or indirectly mounted on the first ratchet (2), the first pawl (1) is directly or indirectly mounted on the first pawl seat (4), the first friction cam (5) is directly or indirectly connected to the first pawl (1), and the first pawl (1) is rotatable relative to the first pawl seat (4) within a certain angle range; and / or When the first friction cam (5) is directly or indirectly mounted on the first ratchet (2), and when the first friction cam (5) rotates relative to the first ratchet (2) to the first defined angle position, under the direct or indirect action of the first friction cam (5), the first return spring (3), and the first pawl (1), the first pawl seat (4) selectively engages with the first ratchet (2); and / or When the first friction cam (5) is directly or indirectly mounted on the first ratchet (2), and when the first friction cam (5) rotates relative to the first ratchet (2) to the second defined angle position, under the direct or indirect action of the first friction cam (5), the first return spring (3), and the first pawl (1), the first pawl seat (4) is separated from the first ratchet (2); and / or The first ratchet (2) and the first pawl seat (4) are respectively connected to components of the machine, or the first ratchet (2) and the first pawl seat (4) are respectively connected to components of the device, or the first ratchet (2) and the first pawl seat (4) are respectively connected to components of the transmission system, or the first ratchet (2) and the first pawl seat (4) are respectively connected to components of the mechanism; and / or The first pawl (1) includes at least one or more components; and / or The first ratchet (2) includes at least one or more components; and / or The first return spring (3) includes at least one or more components; and / or The first pawl seat (4) includes at least one or more components; and / or The first friction cam (5) includes at least one or more components.

3. The ratchet clutch with a friction cam as described in claim 1, characterized in that: The pawl includes at least a first pawl (1); and / or The ratchet includes at least a first ratchet (2); and / or The return spring includes at least a first return spring (3); and / or The pawl seat includes at least a first pawl seat (4); and / or The friction cam includes at least a first friction cam (5); and / or The first friction cam (5) is directly or indirectly disposed on the first pawl seat (4). The first friction cam (5) interacts directly or indirectly with the first ratchet (2) through friction. Under the direct or indirect friction of the first ratchet (2), the first friction cam (5) is rotatable relative to the first pawl seat (4) between the first defined angular position and the second defined angular position; and / or The first return spring (3) is directly or indirectly connected to the first pawl (1); and / or When the first friction cam (5) is directly or indirectly mounted on the first pawl seat (4), the first pawl (1) is directly or indirectly mounted on the first pawl seat (4), the first friction cam (5) is directly or indirectly connected to the first pawl (1), and the first pawl (1) is rotatable relative to the first pawl seat (4) within a certain angle range; and / or When the first friction cam (5) is directly or indirectly mounted on the first pawl seat (4), and when the first friction cam (5) rotates relative to the first pawl seat (4) to the first defined angle position, under the direct or indirect action of the first friction cam (5), the first return spring (3), and the first pawl (1), the first pawl seat (4) and the first ratchet (2) selectively engage; and / or When the first friction cam (5) is directly or indirectly mounted on the first pawl seat (4), and when the first friction cam (5) rotates relative to the first pawl seat (4) to the second defined angle position, under the direct or indirect action of the first friction cam (5), the first return spring (3), and the first pawl (1), the first pawl seat (4) and the first ratchet (2) are in a separated state; and / or The first ratchet (2) and the first pawl seat (4) are respectively connected to components of the machine, or the first ratchet (2) and the first pawl seat (4) are respectively connected to components of the device, or the first ratchet (2) and the first pawl seat (4) are respectively connected to components of the transmission system, or the first ratchet (2) and the first pawl seat (4) are respectively connected to components of the mechanism; and / or The first pawl (1) includes at least one or more components; and / or The first ratchet (2) includes at least one or more components; and / or The first return spring (3) includes at least one or more components; and / or The first pawl seat (4) includes at least one or more components; and / or The first friction cam (5) includes at least one or more components.

4. The ratchet clutch with a friction cam as described in claim 1, characterized in that: The pawl includes at least a first pawl (1); and / or The ratchet includes at least a first ratchet (2); and / or The return spring includes at least a first return spring (3); and / or The pawl seat includes at least a first pawl seat (4); and / or The friction cam includes at least a first friction cam (5); and / or The first friction cam (5) is directly or indirectly disposed on the first pawl seat (4). The first friction cam (5) interacts directly or indirectly with the first ratchet (2) through friction. Under the direct or indirect friction of the first ratchet (2), the first friction cam (5) is rotatable relative to the first pawl seat (4) between the first defined angular position and the second defined angular position; and / or The first return spring (3) is directly or indirectly connected to the first pawl (1); and / or When the first friction cam (5) is directly or indirectly mounted on the first pawl seat (4), the first pawl (1) is directly or indirectly mounted on the first friction cam (5), the first pawl seat (4) is directly or indirectly connected to the first pawl (1), and the first pawl (1) is rotatable relative to the first friction cam (5) within a certain angle range; and / or When the first friction cam (5) is directly or indirectly mounted on the first pawl seat (4), and when the first friction cam (5) rotates relative to the first pawl seat (4) to the first defined angle position, under the direct or indirect action of the first friction cam (5), the first return spring (3), and the first pawl (1), the first pawl seat (4) and the first ratchet (2) selectively engage; and / or When the first friction cam (5) is directly or indirectly mounted on the first pawl seat (4), and when the first friction cam (5) rotates relative to the first pawl seat (4) to the second defined angle position, under the direct or indirect action of the first friction cam (5), the first return spring (3), and the first pawl (1), the first pawl seat (4) and the first ratchet (2) are in a separated state; and / or The first ratchet (2) and the first pawl seat (4) are respectively connected to components of the machine, or the first ratchet (2) and the first pawl seat (4) are respectively connected to components of the device, or the first ratchet (2) and the first pawl seat (4) are respectively connected to components of the transmission system, or the first ratchet (2) and the first pawl seat (4) are respectively connected to components of the mechanism; and / or The first pawl (1) includes at least one or more components; and / or The first ratchet (2) includes at least one or more components; and / or The first return spring (3) includes at least one or more components; and / or The first pawl seat (4) includes at least one or more components; and / or The first friction cam (5) includes at least one or more components.

5. The ratchet clutch with a friction cam as described in any one of claims 1 to 4, characterized in that: When the friction cam is directly or indirectly mounted on the ratchet, under the elastic force of the spring, the friction cam interacts directly or indirectly with the pawl seat through friction; and / or When the friction cam is directly or indirectly mounted on the ratchet seat, under the elastic force of the spring, the friction cam interacts directly or indirectly with the ratchet through friction; and / or When the friction cam is directly or indirectly mounted on the ratchet, under the elastic force of the elastic structure, the friction cam interacts directly or indirectly with the pawl seat through friction; and / or When the friction cam is directly or indirectly mounted on the ratchet seat, under the elastic force of the elastic structure, the friction cam interacts directly or indirectly with the ratchet through friction.

6. The ratchet clutch with a friction cam as described in claim 2, characterized in that: When the friction cam is directly or indirectly mounted on the ratchet, and when the friction cam rotates relative to the ratchet to the first defined angular position, the ratchet provides angular positioning for the friction cam; and / or When the friction cam is directly or indirectly mounted on the ratchet, and when the friction cam rotates relative to the ratchet to the second defined angle position, the ratchet has an angle positioning function for the friction cam.

7. The ratchet clutch with a friction cam as described in any one of claims 3 to 4, characterized in that: When the friction cam is directly or indirectly mounted on the pawl seat, and when the friction cam rotates relative to the pawl seat to the first defined angular position, the pawl seat provides angular positioning for the friction cam; and / or When the friction cam is directly or indirectly mounted on the pawl seat, and when the friction cam rotates relative to the pawl seat to the second defined angle position, the pawl seat has an angle positioning function for the friction cam.

8. The ratchet clutch with a friction cam as described in any one of claims 1 to 4, characterized in that: When the friction cam is directly or indirectly mounted on the ratchet, the friction cam is rotatably mounted on the ratchet directly or indirectly through a clearance fit between the shaft and the ratchet; and / or When the friction cam is directly or indirectly mounted on the pawl seat, the friction cam is rotatably mounted on the pawl seat through a clearance fit between the shaft and the hole.

9. The ratchet clutch with a friction cam as described in any one of claims 1 to 4, characterized in that: When the friction cam is directly or indirectly mounted on the ratchet, the friction cam is rotatably mounted on the ratchet directly or indirectly via a bearing; and / or When the friction cam is directly or indirectly mounted on the ratchet seat, the friction cam is rotatably mounted on the ratchet seat directly or indirectly via a bearing.

10. The ratchet clutch with a friction cam as described in any one of claims 1 to 4, characterized in that: When the pawl is directly or indirectly mounted on the pawl seat, the pawl is rotatably mounted on the pawl seat directly or indirectly through a clearance fit between the shaft and the pawl, or the pawl is rotatably mounted on the pawl seat directly or indirectly through a bearing; and / or When the pawl is directly or indirectly disposed on the friction cam, the pawl is rotatably disposed on the friction cam through a clearance fit between the shaft and the hole, or the pawl is rotatably disposed on the friction cam through a bearing.

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