Cam actuating assembly, actuator and transmission

Abstract

A cam actuation assembly, the cam actuation assembly comprising: an actuation cam; the cam actuating assembly comprises an actuating cam, an intermediate rotating member capable of rotating around a rotation axis and engaged with the actuating cam to drive the actuating cam to rotate around the rotation axis, and a fixing pin inserted into and passing through both the actuating cam and the intermediate rotating member, and the actuating cam and the middle rotating piece are kept relatively fixed in the direction of the rotating axis. The utility model further provides an actuator comprising the cam actuating assembly and a transmission comprising the actuator.

Description

Technical Field

[0001] The utility model relates to the field of mechanical manufacturing, and specifically designs a cam actuating assembly, an actuator comprising the cam actuating assembly, and a transmission comprising the actuator. Background Art

[0002] The transmission used in vehicles is an indispensable key component in the vehicle's driving. The transmission is a mechanism used to change the speed and torque from the engine, and can change the output shaft and input shaft transmission ratio in a fixed or step-by-step manner.

[0003] The shift fork is a crucial component of a vehicle's transmission, typically used for clutch shifting. It plays a crucial role in the transmission's shift mechanism and serves as the primary shifting element. Its function is to adjust the engagement and disengagement of the various gears within the transmission to achieve acceleration, deceleration, or reverse. During this process, the shift fork also regulates the vehicle's driving force, enabling the moving parts to smoothly transition from one speed to another.

[0004] Among them, the rotational movement of the shift fork is mainly driven by the cam actuating assembly in the transmission, but Figure 4 As shown, in the conventional cam actuating assembly 1 ′ of a transmission, there is a certain gap between the actuating cam 11 ′ and the bearing B′ at the front end.

[0005] Therefore, when the drive system drives the actuating cam 11' to rotate, the actuating cam 11' may translate axially toward the direction close to the bearing B' or tilt relative to the bearing B', thereby causing the actuating cam 11' to be unable to rotate normally, thereby causing gear shifting to be stuck or even unable to shift. Utility Model Content

[0006] The present utility model is made to solve the above technical problems, and its purpose is to provide a cam actuating assembly, an actuator including the cam actuating assembly, and a transmission including the actuator.

[0007] In order to achieve the purpose of the present invention, a cam actuating assembly is provided, which includes: an actuating cam; and an intermediate rotating member, which can rotate around the rotation axis and engage with the actuating cam to drive the actuating cam to rotate around the rotation axis. The cam actuating assembly also includes a fixing pin, which is inserted into and passes through both the actuating cam and the intermediate rotating member to keep the actuating cam and the intermediate rotating member relatively fixed in the direction of the rotation axis.

[0008] According to the above configuration, by inserting the fixing pin in both the actuating cam and the intermediate rotating member, it is possible to prevent the actuating cam from being deviated in the direction of the rotation axis and affecting the performance of the cam actuating assembly.

[0009] Preferably, the fixing pin is inserted into both the actuating cam and the intermediate rotating member in a direction in which the intermediate rotating member moves relative to the actuating cam.

[0010] According to the above-described structure, by inserting a fixing pin in the direction of movement of the intermediate rotating member relative to the actuating cam, the fixing pin can be used as a guide to guide the relative movement of the intermediate rotating member relative to the actuating cam while preventing axial displacement of the actuating cam without causing adverse effects on the relative movement.

[0011] Preferably, a cam mounting hole is formed in the above-mentioned actuating cam, and a rotating member mounting hole whose hole axis coincides with the hole axis of the cam mounting hole is formed in the above-mentioned intermediate rotating member, and the above-mentioned fixing pin includes an insertion portion, which is inserted into the above-mentioned cam mounting hole and the above-mentioned rotating member mounting hole.

[0012] Preferably, the insertion portion is inserted into at least one of the cam mounting hole and the rotating member mounting hole in an interference fit manner.

[0013] According to the above-mentioned structure, the insertion portion of the fixing pin is inserted into the mounting holes of the actuating cam and the intermediate rotating member by means of interference fit, so that the fixing pin can be firmly fixed in the above-mentioned mounting hole while preventing axial displacement of the actuating cam, without causing any adverse conditions such as falling off relative to the cam actuating assembly.

[0014] Preferably, the actuating cam is provided with a mounting surface, which is a plane parallel to the rotation axis. The fixing pin further comprises a flange portion, and the cam mounting hole is a threaded hole. The external thread formed on the outer periphery of the insertion portion is matched with the internal thread of the cam mounting hole until the flange portion is tightly fitted with the mounting surface.

[0015] According to the above structure, the fixing pin can be fixed to the actuating cam by screw fastening. Similarly, the fixing pin can be firmly fixed to the actuating cam while preventing axial displacement of the actuating cam without causing any problems such as falling off relative to the cam actuating assembly.

[0016] Preferably, the cam actuating assembly further includes a biasing member installed between the inner surface of the actuating cam and the intermediate rotating member, and the biasing member is a compressed elastic member.

[0017] Preferably, the biasing member is a coil spring.

[0018] Preferably, a central axis of the coil spring coincides with a central axis of the fixing pin, and an outer diameter of the insertion portion of the fixing pin is the same as an inner diameter of the coil spring.

[0019] According to the above-described structure, by making the central axis of the fixing pin coincide with the central axis of the coil spring and making the outer diameter of the fixing pin the same as the inner diameter of the coil spring, not only can the fixing pin serve as a guide for guiding the compression and release of the coil spring so as to better achieve the working effect of the cam actuating assembly, but the fixing pin can also be retained by the coil spring, thereby preventing axial deviation of the actuating cam and preventing the fixing pin from falling off relative to the cam actuating assembly.

[0020] In addition, the present invention also provides an actuator, which is used for a transmission fork. The actuator includes: the cam actuating assembly as described above.

[0021] In addition, the present invention also provides a transmission, which includes: the actuator described above; a shift fork, which is actuated by the actuator; and a clutch, which includes a moving part driven to translate by the shift fork. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] With reference to the above purposes, the technical features of the present invention are clearly described in the following technical scheme, and its advantages are obvious from the following detailed description with reference to the accompanying drawings, which show the preferred embodiments of the present invention in an exemplary manner without limiting the scope of the concept of the present invention.

[0023] Figure 1 It is a schematic three-dimensional structural diagram of a cam actuating assembly of an actuator for a transmission fork according to the utility model.

[0024] Figure 2 It is a cross-sectional view of a cam actuating assembly of an actuator for a transmission fork according to the present invention.

[0025] Figure 3 The figure is a schematic diagram of the overall structure of an embodiment of an actuator for a transmission shift fork and a corresponding shift fork assembly controlled by the actuator according to the present invention.

[0026] Figure 4 It is a schematic diagram of the overall structure of the cam actuating assembly of the transmission in the prior art.

[0027] Explanation of symbols

[0028] 1. 1' cam actuating assembly;

[0029] 11, 11' actuating cam;

[0030] 11a mounting surface;

[0031] 11b shift fork action surface;

[0032] 12 intermediate rotating parts;

[0033] 13 interlocking cam;

[0034] 14 offset member;

[0035] 15 fixing pin;

[0036] 15a insertion;

[0037] 15b flange portion;

[0038] 2 actuators;

[0039] 21 support member;

[0040] 22 drive system;

[0041] 23 printed circuit boards;

[0042] 3 shift fork;

[0043] 31 cam follower;

[0044] 32 fork fulcrum;

[0045] T axis of rotation;

[0046] T1 rotation axis;

[0047] B, B' bearings;

[0048] O1, O2 center axis. DETAILED DESCRIPTION

[0049] Reference will now be made in detail to various embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

[0050] Although the present invention is described in conjunction with exemplary embodiments, it should be appreciated that this description is not intended to limit the present invention to the exemplary embodiments described below. On the contrary, the present invention is intended to cover not only these exemplary embodiments, but also various alternatives, modifications, equivalents, and other embodiments that may be included within the spirit and scope of the present invention as defined by the appended claims.

[0051] In order to facilitate explanation and accurately define the technical solutions of the present invention, the terms “upper”, “lower”, “inner” and “outer” are used to describe features of the exemplary embodiments shown in the drawings with reference to their positions.

[0052] Below, refer to Figure 1 , the overall structure of the cam actuating assembly 1 of the actuator for the transmission fork according to the present invention is described. Figure 1 It is a schematic diagram showing the overall structure of the cam actuating assembly 1 of the present invention.

[0053] like Figure 1 As shown, one end of the cam actuator assembly 1 of the present invention is connected to the rotating shaft of the driving system, and the other end is connected to the rotating shaft T supported by the bearing B, and can rotate around the rotation axis T1 of the rotating shaft T.

[0054] Furthermore, the cam actuating assembly 1 of the present invention as a whole mainly includes an actuating cam 11 , an intermediate rotating member 12 , an interlocking cam 13 , a biasing member 14 and a fixing pin 15 .

[0055] The actuating cam 11 has a substantially rectangular opening formed therein, and the intermediate rotating member 12 is inserted and installed in the opening.

[0056] In addition, the actuating cam 11 is mainly used to cooperate with a cam follower 31 on the shift fork 3 to drive the shift fork 3 to rotate, and its outer surface mainly includes a mounting surface 11 a and a shift fork operating surface 11 b.

[0057] The mounting surface 11 a is a flat surface formed by removing a portion of the top end of the conventional actuating cam 11 and is primarily used for mounting and fixing a fixing pin 15 described later. The shift fork operating surface 11 b is formed as an arc surface and is primarily used for interacting with a cam follower 31 fixed to a shift fork 3 described later to drive the shift fork 3 to move back and forth between different gear positions.

[0058] Hereinafter, for convenience of description, one end of the actuating cam 11 on which the mounting surface 11 a is formed is referred to as a top end, and the other end opposite to the top end in the vertical direction is referred to as a bottom end.

[0059] One end of the intermediate rotating member 12 is inserted into the hole of the actuating cam 11 . After the actuating cam 11 is installed in place, a certain gap exists between the actuating cam 11 and the bearing B.

[0060] One end of the intermediate rotating member 12 is connected to the rotating shaft of the motor of the drive system, and the other end is connected to the rotating shaft T supported by the bearing B, thereby converting the original motion from the drive system into its own rotational motion, and then driving the actuating cam 11 to rotate, thereby driving the shift fork 3 to move back and forth between different gear positions.

[0061] The interlocking cam 13 is sleeved and fixedly mounted on the corresponding intermediate rotating member 12 to move back and forth with the intermediate rotating member 12 between different gear positions.

[0062] The interlocking cam 13 is mainly used for an actuator including multiple shift forks. A groove for inserting an interlocking pin (not shown) is formed on the outer peripheral surface of the interlocking cam 13. The groove is used to receive the interlocking pin that moves back and forth parallel to the two shift forks to achieve locking and unlocking of the interlocking cams used for the two shift forks respectively.

[0063] As described above, in the present invention, an example is shown in which the cam actuating assembly 1 includes an interlocking cam 13, but the present invention is not limited to this. The above-mentioned interlocking cam 13 is mainly used for an actuator including multiple shift forks. In a general vehicle transmission, the cam actuating assembly 1 of the present invention may also not include the interlocking cam 13.

[0064] An installation passage for installing the biasing member 14 is formed at a position of the intermediate rotating member 12 corresponding to the hole of the actuating cam 11 .

[0065] The biasing member 14 is mounted in the aperture of the actuating cam 11 and in the mounting channel in the intermediate rotating member 12 . The biasing member 14 is preferably a coil spring.

[0066] More specifically, if Figure 2 As shown, one end of the compression spring abuts against the inner surface of the aperture of the actuating cam 11 at the bottom end thereof, and the other end abuts against the inner surface of the mounting channel of the intermediate rotating member 12 at the top end thereof.

[0067] During the rotation operation of the cam actuating assembly 1 , the intermediate rotating member 12 of the cam actuating assembly 1 rotates around the rotation axis T1 of the rotation shaft T under the drive of the driving system.

[0068] During this process, due to the interaction between the fork acting surface 11b of the actuating cam 11 and the cam follower 31 of the shift fork 3, the above-mentioned intermediate rotating member 12 will perform appropriate relative movement relative to the actuating cam 11 in the direction from the top end to the bottom end of the actuating cam 11 within the hole, and during this relative movement, the biasing member 14 installed in the actuating cam 11 and the intermediate rotating member 12 will be compressed.

[0069] Specifically, the biasing member 14 is configured to assist in the movement of the cam actuating assembly 1 so that the cam actuating assembly 1 can move quickly between different gear positions. The biasing member 14 helps the shift fork overcome momentary jams by storing potential energy in the biasing member 14 when compressed and releasing the potential energy as force to the cam follower 31 and the shift fork 3.

[0070] The fixing pin 15 is configured to be inserted from the mounting surface 11 a of the actuating cam 11 and inserted into the actuating cam 11 and the intermediate rotating member 12 .

[0071] Below, refer to Figure 2 , the installation method of the fixing pin 15 relative to the actuating cam 11 in the cam actuating assembly 1 of the present invention is further described.

[0072] like Figure 2 As shown, a cam mounting hole is formed at one end of the actuating cam 11 where the mounting surface 11 a is formed, and a rotating member mounting hole whose hole axis coincides with the cam mounting hole of the actuating cam 11 is formed at a corresponding position of the intermediate rotating member 12 .

[0073] Through these two mounting holes, the fixing pin 15 can be inserted into the mounting holes of the actuating cam 11 and the intermediate rotating member 12 by means of an interference fit. In this case, during the rotational movement of the cam actuating assembly 1, the actuating cam 11 can be prevented from deflecting in the direction of the rotation axis T1 of the rotating shaft T.

[0074] It should be noted that, as mentioned above, it is only necessary for the axis of the cam mounting hole of the actuating cam 11 and the rotating member mounting hole of the intermediate rotating member 12 to coincide with each other. Depending on the specific method of the fixing pin, the diameters of the two mounting holes do not need to be exactly the same.

[0075] In addition, the fixing pin 15 only needs to be inserted into the mounting hole of either the actuating cam 11 or the intermediate rotating member 12 in an interference fit manner, so that the fixing pin 15 can be fixed in the cam actuating assembly 1 and achieve movement in the up and down directions.

[0076] Furthermore, it is preferable that the fixing pin 15 is inserted from the mounting surface 11 a into the actuating cam 11 and the intermediate rotating member 12 in the direction in which the intermediate rotating member 12 moves relative to the actuating cam 11 .

[0077] With this configuration, the fixing pin 15 can be prevented from adversely affecting the movement of the intermediate rotating member 12 relative to the actuating cam 11 and can also serve as a guide for the relative movement.

[0078] As described above, in the present invention, the fixing pin 15 is inserted into the mounting holes of the actuating cam 11 and the intermediate rotating member 12 by interference fit, but the present invention is not limited thereto, as long as the actuating cam 11 can be prevented from being offset on the rotation axis T1.

[0079] For example, the cam mounting hole of the actuating cam 11 can be formed as a threaded hole with an internal thread, and the fixing pin 15 can be formed as a fixing screw with a flange portion such as a nut and an external thread. By screwing the fixing screw into the threaded hole of the actuating cam 11, the fixing screw can be fixed relative to the actuating cam 11, and by forming the aperture of the rotating member mounting hole of the intermediate rotating member 12 to be slightly larger than the insertion portion of the fixing screw, the relative movement of the actuating cam 11 and the intermediate rotating member 12 will not be hindered.

[0080] In addition, if Figure 2 As shown, preferably, the vertical center axis O1 of the fixing pin 15 coincides with the vertical center axis O2 of the biasing member 14 , and the vertical length of the fixing pin 15 is smaller than the vertical length of the biasing member 14 .

[0081] With this configuration, it is possible to prevent the biasing member 14 from interfering with the fixing pin 15 during the extension and compression of the biasing member 14 and thus preventing the movement of the cam actuating assembly 1 from being adversely affected.

[0082] The diameter of the fixing pin 15 in the direction of the rotation axis T1 is referred to as the outer diameter, and the inner diameter of the coil spring as the biasing member 14 is referred to as the inner diameter. Preferably, the outer diameter of the fixing pin 15 and the inner diameter of the biasing member 14 are substantially the same.

[0083] By such a structure, the fixing pin 15 can be inserted into the biasing member 14 through the mounting hole, and the fixing pin 15 can be further held by the biasing member 14, which can improve the fixing strength of the fixing pin 15, and the tension and compression movement of the biasing member 14 can be guided by the fixing pin 15, thereby helping the biasing member 14 to function better.

[0084] Next, refer to Figure 3 , the specific structure of the actuator 2 including the cam actuating assembly 1 according to the present invention is described. Figure 3 It is a schematic diagram of the overall structure of the actuator for the transmission fork according to the utility model.

[0085] like Figure 3 As shown, in addition to the actuator itself, such a transmission generally comprises at least a shift fork 3 actuated by the actuator. Figure 1 Only one shift fork 3 is shown in the figure, but the actuator of the present invention can also be used to actuate a transmission including multiple shift forks. Figure 1 Not explicitly shown in the figure, this type of transmission generally also includes a clutch driven by the shift fork 3.

[0086] More specifically, such a clutch may include a movable portion that is driven to translate by the shift fork 3. The movable portion can take various possible forms, such as a disc with teeth on either side, etc., which will not be described in detail here. It should be understood that the actuator of the present invention is suitable for actuating various clutches that can be driven by the movement of a shift fork.

[0087] In a preferred embodiment of a dog-type clutch, the clutch disc with dog teeth can cooperate with the fork of the shift fork 3 through its circumferential grooves, so that the rotation and / or translation of the shift fork 3 can drive the clutch disc to translate along its axis, thereby engaging different gears.

[0088] Back to Figure 3 The actuator 2 of the cam actuating assembly 1 according to the present invention mainly includes: a support member 21 , a driving system 22 and a printed circuit board 23 .

[0089] The support member 21 is connected to the transmission housing ( Figure 3 (not shown) and is used to support the entire actuator 2. It should be noted that Figure 3 Only one possible structure and arrangement of the support member 21 is schematically shown in the figure. Those skilled in the art can select various suitable support members 21 according to actual needs to support the actuator relative to the transmission.

[0090] The drive system 22 is fixedly connected to the support 21 in a detachable manner. The drive system 22 can output the original movement for the shift fork 3. Figure 3 In the preferred embodiment shown in , the drive system 22 can output the original rotational motion by an electric motor. Of course, those skilled in the art can also select other various prime movers to output various original motions according to actual needs, which will not be described in detail here.

[0091] Furthermore, the drive system 22 can convert the original motion from the electric motor into the rotational motion of the corresponding cam actuating assembly 1 through a gear train. In addition, the rotational motion of the cam actuating assembly 1 can also be converted into the motion of the shift fork 3 in various ways, which will not be described in detail here.

[0092] Specifically, the actuating cam 11 cooperates with the cam follower 31 on the shift fork 3 to drive the shift fork 3 to rotate. Figure 3 Specifically, the shift fork 3 is driven to rotate around the shift fork fulcrum 32.

[0093] The printed circuit board 23 is arranged between the electric motor and the cam actuating assembly 1 . A controller for controlling the driving system 22 is arranged on the printed circuit board 23 so that the functions of the main printed circuit board 23 can be fully utilized.

[0094] (Technical Effect)

[0095] According to the cam actuating assembly 1 of the present invention, the actuating cam 11 and the intermediate rotating member 12 are firmly fixed together by the fixing pin 15, which can prevent the actuating cam 11 from moving translationally in the direction of the rotation axis of the rotating shaft T toward the direction close to the bearing B or from tilting relative to the bearing B, thereby causing adverse effects on the movement of the cam actuating assembly 1.

[0096] Although the structure and working principle of the present invention have been described above in conjunction with preferred embodiments, those skilled in the art will recognize that the above examples are for illustration only and do not constitute a limitation of the present invention. The present invention may be modified and varied within the spirit of the claims, and such modifications and variations shall fall within the scope of protection of the present invention.

Claims

1. A cam actuating assembly (1), comprising: Actuating cam (11); as well as an intermediate rotating member (12), the intermediate rotating member (12) being capable of rotating about a rotation axis (T1) and being engaged with the actuating cam (11) so as to drive the actuating cam (11) to rotate about the rotation axis (T1), It is characterized by: The cam actuating assembly (1) further comprises a fixing pin (15), The fixing pin (15) is inserted into and passes through both the actuating cam (11) and the intermediate rotating member (12) to keep the actuating cam (11) and the intermediate rotating member (12) relatively fixed in the direction of the rotation axis (T1).

2. The cam actuating assembly (1) according to claim 1, characterized in that The fixing pin (15) is inserted into both the actuating cam (11) and the intermediate rotating member (12) in a direction in which the intermediate rotating member (12) moves relative to the actuating cam.

3. The cam actuating assembly (1) according to claim 2, characterized in that A cam mounting hole is formed in the actuating cam (11), and a rotating member mounting hole whose hole axis coincides with the hole axis of the cam mounting hole is formed in the intermediate rotating member (12). The fixing pin (15) includes an inserting portion (15a) which is inserted into the cam mounting hole and the rotating member mounting hole.

4. The cam actuating assembly (1) according to claim 3, characterized in that The inserting portion (15a) is inserted into at least one of the cam mounting hole and the rotating member mounting hole in an interference fit manner.

5. The cam actuating assembly (1) according to claim 3, characterized in that The actuating cam (11) is provided with a mounting surface (11a), which is a plane parallel to the rotation axis (T1). The fixing pin (15) further includes a flange portion (15b), and the cam mounting hole is a threaded hole. The external thread formed on the outer periphery of the insertion portion (15a) is matched with the internal thread of the cam mounting hole until the flange portion (15b) is tightly fitted with the mounting surface (11a).

6. The cam actuating assembly (1) according to any one of claims 3 to 5, characterized in that The cam actuation assembly (1) further includes a biasing member (14), The biasing member (14) is installed between the inner surface of the actuating cam (11) and the intermediate rotating member (12), and is a compressed elastic member.

7. The cam actuating assembly (1) according to claim 6, characterized in that The biasing member (14) is a coil spring.

8. The cam actuating assembly (1) according to claim 7, characterized in that The central axis of the coil spring coincides with the central axis of the fixing pin (15), Furthermore, the outer diameter of the insertion portion (15a) of the fixing pin (15) is the same as the inner diameter of the coil spring.

9. An actuator (2), the actuator (2) being used for a transmission fork (3), the actuator (2) comprising: A cam actuated assembly (1) as claimed in any one of claims 1 to 8.

10. A transmission, characterized in that: The transmission comprises: The actuator (2) according to claim 9; a shift fork (3), the shift fork (3) being actuated by the actuator (2); and A clutch comprises a moving part driven by the shift fork (3) to move in translation.

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