Cam transmission assembly

Abstract

A cam drive assembly includes a drive cam that rotates about an axis of rotation of a rotating shaft with a gap between the drive cam and a bearing supporting the rotating shaft, and a stop plate that is disposed between the drive cam and the bearing supporting the rotating shaft. The stop plate is arranged between the transmission cam and the bearing so as to keep the transmission cam fixed in the direction of the rotation axis. By means of the cam transmission assembly, axial deviation of the transmission cam can be effectively prevented, and therefore the mechanical performance of the cam transmission assembly is guaranteed.

Description

Technical Field

[0001] The utility model relates to a cam transmission component, in particular to a cam transmission component applied to a transmission system of an automobile. Background Art

[0002] The transmission used in a vehicle is an indispensable key component in the operation of the car. The transmission is a mechanism used to change the engine speed and torque, and can change the transmission ratio of the output shaft and the input shaft 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 shifting mechanism and serves as the primary shifting component. Its function is to adjust the engagement and disengagement of the transmission's various gears, enabling acceleration, deceleration, and reverse. During this process, the shift fork also regulates the vehicle's driving force, ensuring a smooth transition from one speed to another.

[0004] The rotation of the shift fork is mainly driven by the cam drive assembly inside the transmission. Figure 4 As shown, in the conventional cam transmission assembly 1 ′, there is a certain gap between the transmission cam 11 ′ and the front bearing B′.

[0005] Therefore, when the drive system drives the transmission cam 11' to perform rotational motion, the transmission cam 11' may translate toward the axial direction of the bearing B' or tilt relative to the bearing B', causing the transmission cam 11' to be unable to rotate normally, thereby causing shifting delay or even failure 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 transmission assembly, which can prevent the axial deviation of the transmission cam.

[0007] In order to achieve the purpose of the present invention, a cam transmission assembly is provided, which includes: a transmission cam, which rotates around the rotation axis of the rotating shaft, and there is a gap between the transmission cam and the bearing supporting the rotating shaft. The cam transmission assembly also includes a stop plate, which is arranged between the transmission cam and the bearing to keep the transmission cam fixed in the direction of the rotation axis.

[0008] According to the above-described structure, by sandwiching a stopper plate between the transmission cam and the bearing, the transmission cam can be effectively prevented from deviating toward the bearing side in the direction of the rotation axis. The structure is simple and easy to implement.

[0009] Preferably, the cam transmission assembly further includes an intermediate rotating member, one end of which is connected to the drive system, and the other end is inserted into the transmission cam and connected to the rotating shaft, and the stop plate is shaped to match the transmission cam and the intermediate rotating member so as to rotate with the two.

[0010] According to the above configuration, by matching the shape of the stop plate with the transmission cam and the intermediate rotating member to rotate synchronously with both, it is possible to prevent axial deviation of the transmission cam while minimizing the impact on the working performance of the cam transmission assembly.

[0011] Preferably, the above-mentioned stop plate includes: a transmission cam abutment portion, which abuts against the above-mentioned transmission cam; an intermediate rotating part abutment portion, which abuts against the above-mentioned intermediate rotating part; and an abutment portion connecting portion, which abuts against the above-mentioned bearing and connects the above-mentioned transmission cam abutment portion and the above-mentioned intermediate rotating part abutment portion together.

[0012] According to the structure described above, the stop plate includes a transmission cam abutting portion that abuts against the transmission cam, an intermediate rotating part abutting portion that abuts against the intermediate rotating part, and an abutting portion connecting portion that abuts against the bearing, which can firmly fix the stop plate between the transmission cam and the bearing, thereby effectively preventing axial displacement of the transmission cam.

[0013] Preferably, the intermediate rotating member is inserted into the transmission cam and extends beyond the transmission cam by a certain distance, thereby forming a height difference between the transmission cam and the intermediate rotating member in the direction of the rotation axis, and the abutment connection portion maintains contact with the intermediate rotating member while crossing the height difference.

[0014] According to the above configuration, since a height difference is formed between the transmission cam and the intermediate rotating member, a form fit can be formed by the height difference, thereby firmly engaging the stopper plate with the transmission cam and the intermediate rotating member.

[0015] Preferably, the contact portion connecting portion is formed as a protrusion protruding toward the bearing.

[0016] Preferably, the protrusion is formed to have an arc-shaped or triangular cross-section when cut along a plane perpendicular to the vertical direction, and abuts against the bearing in a line contact manner.

[0017] According to the structure described above, by forming the abutment connecting portion into a protrusion with an arc-shaped or triangular cross-section, the abutment connecting portion, i.e., the stop plate, can be brought into line contact with the bearing, thereby reducing the contact area with the bearing, reducing the frictional resistance relative to the stationary bearing during the rotational movement, and effectively reducing the impact on the working performance of the cam transmission assembly.

[0018] Preferably, a surface of the transmission cam contact portion is in contact with a surface of the transmission cam, and a surface of the intermediate rotating member contact portion is in contact with a surface of the intermediate rotating member.

[0019] According to the structure described above, by making the transmission cam abutment portion and the transmission cam surface-fitted, and the intermediate rotating member abutment portion and the above-mentioned intermediate rotating member surface-fitted, the contact area between the above-mentioned two components can be respectively expanded, so that the stop plate can be more reliably clamped between the bearing and the transmission cam and the intermediate rotating member, so as to effectively prevent axial displacement of the transmission cam.

[0020] Preferably, a plurality of transmission cam abutment portions are attached to the intermediate rotating member abutment portion.

[0021] Preferably, the number of the transmission cam contact portions is three, and the transmission cam contact portions are arranged along the circumferential direction of the rotation shaft at intervals of 90° from each other.

[0022] According to the above configuration, a plurality of transmission cam abutting portions can form a perfect shape fit with the transmission cam and the intermediate rotating member, so as to perform rotational motion synchronously with the transmission cam and the intermediate rotating member.

[0023] Preferably, the stopper plate has a mirror-symmetrical shape with respect to a plane formed by the central axis and the rotation axis.

[0024] According to the above configuration, by forming the stopper plate into a mirror-symmetrical shape, the mass distribution of the cam transmission assembly on both sides relative to the central axis of the biasing member can be kept uniform, thereby minimizing the impact on the operating performance of the cam transmission assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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.

[0026] Figure 1 It is a schematic three-dimensional structural diagram of a cam transmission assembly of an actuator for a transmission fork according to the utility model.

[0027] Figure 2 It is a front view of a cam transmission assembly of an actuator for a transmission fork according to the utility model.

[0028] Figure 3 It is a three-dimensional view of a stop plate of a cam transmission assembly of an actuator for a transmission fork according to the present utility model.

[0029] Figure 4 It is a schematic diagram of the overall structure of the cam transmission assembly of the transmission in the prior art.

[0030] Explanation of symbols

[0031] 1. 1' cam transmission assembly;

[0032] 11, 11' transmission cam;

[0033] 12 intermediate rotating parts;

[0034] 13 interlocking cam;

[0035] 14 offset member;

[0036] 15 stop plate;

[0037] 15a: transmission cam abutment portion;

[0038] 15b: intermediate rotating member abutment portion;

[0039] 15c: abutment connecting portion;

[0040] T axis of rotation;

[0041] T1 rotation axis;

[0042] B, B' bearings;

[0043] O1 central axis. DETAILED DESCRIPTION

[0044] Reference will now be made in detail to various embodiments of the present invention, examples of which are illustrated in the accompanying drawings and described below.

[0045] Although the present invention will be described in conjunction with exemplary embodiments, it should be appreciated that this description is not intended to limit the present invention to those exemplary embodiments. On the contrary, the present invention is intended to cover not only those 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.

[0046] For example, a description later in the specification of a first feature being formed above or on a second feature may include an embodiment in which the first and second features are directly linked, or an embodiment in which an additional feature is formed between the first and second features, thereby eliminating the need for direct linking of the first and second features. Furthermore, when a first element is described as being connected to or coupled to a second element, the description includes embodiments in which the first and second elements are directly connected or coupled to each other, and also includes embodiments in which one or more other intervening elements are used to indirectly connect or couple the first and second elements.

[0047] Below, refer to Figure 1 , the overall structure of the cam transmission 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 transmission assembly 1 of the present invention.

[0048] like Figure 1 As shown, one end of the cam transmission 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 as the center.

[0049] In addition, the cam transmission assembly 1 of the present invention as a whole mainly includes a transmission cam 11 , an intermediate rotating member 12 , an interlocking cam 13 , a biasing member 14 and a stop plate 15 .

[0050] The transmission cam 11 has a substantially rectangular opening formed therein, and the intermediate rotating member 12 is inserted and installed in the opening.

[0051] In addition, the transmission cam 11 is mainly used to cooperate with the cam follower 31 on the shift fork 3 described later to drive the shift fork 3 to rotate, and its outer surface is mainly constituted as a shift fork operating surface, which is formed as an arc surface and is mainly used to interact with the cam follower 31 fixed to the shift fork 3 described later to drive the shift fork 3 to move back and forth between different gear positions.

[0052] In the following, for the sake of convenience, the upper end of the above-mentioned transmission cam 11 in the vertical direction is called the top end, the other end opposite to the top end is called the bottom end, and the direction of the rotation axis T1 of the rotation axis T is called the axial direction, and the direction from the top end to the bottom end is called the vertical direction.

[0053] One end of the intermediate rotating member 12 is inserted into the hole of the transmission cam 11 and protrudes toward the bearing B for a distance.

[0054] 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 transmission cam 11 to rotate, thereby driving the shift fork 3 to move back and forth between different gear positions.

[0055] 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.

[0056] 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.

[0057] As described above, in the present invention, an example is shown in which the cam transmission 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 transmission assembly 1 of the present invention may also not include the interlocking cam 13.

[0058] An installation passage for installing the biasing member 14 is formed at a position of the intermediate rotating member 12 corresponding to the opening of the transmission cam 11 .

[0059] The biasing member 14 is mounted in the aperture of the transmission cam 11 and in the mounting channel in the intermediate rotating member 12 . The biasing member 14 is preferably a coil spring.

[0060] More specifically, if Figure 1 and Figure 2 As shown, one end of the compression spring abuts against the inner surface of the orifice of the transmission cam 11 at the bottom end of the transmission cam 11 , and the other end abuts against the inner surface of the mounting channel of the intermediate rotating member 12 at the top end of the transmission cam 11 .

[0061] During the rotation operation of the cam transmission assembly 1 , the intermediate rotating member 12 of the cam transmission assembly 1 rotates around the rotation axis T1 of the rotation shaft T under the drive of the driving system.

[0062] During this process, due to the interaction between the fork acting surface of the transmission cam 11 and the cam follower 31 of the fork 3, the above-mentioned intermediate rotating member 12 will perform appropriate relative movement relative to the transmission cam 11 in the direction from the top end to the bottom end of the transmission cam 11 within the hole, and during this relative movement, the biasing member 14 installed in the transmission cam 11 and the intermediate rotating member 12 will be compressed.

[0063] Specifically, the above-mentioned biasing member 14 is configured to assist the movement of the cam transmission assembly 1 so that the cam transmission 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.

[0064] The stopper plate 15 is provided between the bearing B and the transmission cam 11 and the intermediate rotating member 12 in the cam transmission assembly 1 to prevent the transmission cam 11 from deviating in the direction of the rotation axis T1 of the rotation shaft T, that is, in the axial direction.

[0065] The following, combined Figure 2 and Figure 3 , the specific structure and function of the stop plate 15 in the cam transmission assembly 1 of the present invention are further described.

[0066] like Figure 2 and Figure 3 As shown, the stop plate 15 in the cam transmission assembly 1 of the present invention has a mounting hole (not shown) formed in the center for inserting the rotating shaft T. The stop plate 15 is sleeved on the rotating shaft T through the mounting hole and is axially arranged between the bearing B and the transmission cam 11.

[0067] Specifically, the stopper plate 15 mainly includes a transmission cam abutting portion 15 a , an intermediate rotating member abutting portion 15 b , and an abutting portion connecting portion 15 c .

[0068] In the direction of the rotation axis T1 of the rotating shaft T, that is, in the axial direction, the surface of the above-mentioned transmission cam abutment portion 15a is in contact with the surface of the transmission cam 11, and the surface of the above-mentioned intermediate rotating part abutment portion 15b is in contact with the surface of the intermediate rotating part 12. The above-mentioned abutment portion connecting portion 15c connects the transmission cam abutment portion 15a and the intermediate rotating part abutment portion 15b together, and abuts against the bearing B. Thus, the above-mentioned stop plate 15 can be clamped and fixed between the bearing B and the transmission cam 11 and the intermediate rotating part 12.

[0069] In addition, although the present invention shows an example in which the surface of the transmission cam abutment portion 15a is in contact with the surface of the transmission cam 11 and the surface of the intermediate rotating member abutment portion 15b is in contact with the surface of the intermediate rotating member 12, the present invention is not limited to this. The surfaces of the above-mentioned two components may also abut each other instead of being in contact with each other, as long as the stop plate 15 can be clamped between the bearing B and the transmission cam 11 and the intermediate rotating member 12.

[0070] As described above, the intermediate rotating member 12 is inserted into the transmission cam 11 and extends beyond the transmission cam 11 toward the bearing B, thereby forming a height difference between the transmission cam 11 and the intermediate rotating member 12 in the direction of the rotation axis T1.

[0071] The above-mentioned abutment connecting portion 15c is used to cross the height difference and connect the transmission cam abutment portion 15a that is in contact with the surface of the transmission cam 11 and the intermediate rotating member abutment portion 15b that is in contact with the surface of the intermediate rotating member 12, and the abutment connecting portion 15c maintains partial contact with the intermediate rotating member 12 while crossing the height difference.

[0072] In the present disclosure, the above-mentioned abutment connecting portion 15c is formed as a bearing abutment protrusion, the cross-section of which is formed into an arc shape when cut along a plane perpendicular to the vertical direction, and abuts against the bearing B while connecting the transmission cam abutment portion 15a and the intermediate rotating member abutment portion 15b together.

[0073] By forming the abutment connecting portion 15c into a protrusion with an arc-shaped cross-section, the contact between the above-mentioned bearing abutment protrusion and the bearing B can be configured as a line contact, thereby minimizing the contact area with the bearing B and reducing the frictional resistance during the rotational movement of the cam transmission assembly 1.

[0074] Alternatively, the contact portion connecting portion 15 c may be formed as a protrusion having a triangular cross section so that the contact with the bearing B is realized in line contact.

[0075] The specific movement mode of the cam transmission assembly 1 of the present invention is briefly described below.

[0076] During operation, the intermediate rotating part 12 of the cam transmission assembly 1 drives the transmission cam 11 to rotate around the rotation axis T1 of the rotation axis T under the action of the driving system. During this process, the stop plate 15 rotates synchronously with the transmission cam 11 and the intermediate rotating part 12, and the bearing B remains stationary.

[0077] It should be noted that, although the stop plate 15 is inserted into and mounted on the rotation shaft T, the rotational movement of the stop plate 15 is not mainly driven by the rotation shaft T.

[0078] Specifically, during the rotational movement of the transmission cam 11 and the intermediate rotating part 12, the abutment connecting part 15c of the stop plate 15 maintains contact and interacts with the intermediate rotating part 12 while crossing the above-mentioned height difference, so that under the drive of the intermediate rotating part 12, the stop plate 15 rotates together with the transmission cam 11 and the intermediate rotating part 12 around the rotation axis T1 of the rotation axis T.

[0079] That is to say, the various components of the above-mentioned stop plate 15 are matched with the transmission cam 11 and the intermediate rotating part 12 in shape, the surface of the above-mentioned transmission cam abutment portion 15a is in contact with the surface of the above-mentioned transmission cam 11, the surface of the above-mentioned intermediate rotating part abutment portion 15b is in contact with the surface of the above-mentioned intermediate rotating part 12, and the above-mentioned abutment connection portion 15c maintains contact with the intermediate rotating part 12 while crossing the height difference between the transmission cam 11 and the intermediate rotating part 12, so that the stop plate 15 can rotate together with the transmission cam 11 and the intermediate rotating part 12.

[0080] In addition, if Figure 2 As shown, in the cam transmission assembly 1 of the present invention, three transmission cam abutting portions 15a extending in three different directions are formed on the intermediate rotating member abutting portion 15b.

[0081] By providing three transmission cam abutment portions 15 a facing in different directions, the transmission cam abutment portions 15 a can contact the bearing B at three locations, thereby enabling stable contact and support with the bearing B.

[0082] Furthermore, it is preferable that the three transmission cam contact portions 15 a are arranged along the circumferential direction of the rotation axis (T) at intervals of 90° from each other.

[0083] By configuring in this manner, a perfect form fit can be formed with the transmission cam 11 and the intermediate rotating member 12 so as to perform rotational motion together with the transmission cam 11 and the intermediate rotating member 12 .

[0084] In addition, if Figure 1 As shown, it is more preferable that the stopper plate 15 has a mirror-symmetrical shape with respect to a plane formed by the central axis O1 of the biasing member 14 and the rotation axis T1 of the rotation axis T.

[0085] With this configuration, the mass distribution of the cam assembly 1 on both the left and right sides relative to the central axis O1 of the biasing member 14 can be kept uniform, thereby ensuring the operating performance of the cam assembly 1 .

[0086] like Figure 3 As shown, in the present invention, an example is shown in which a mounting hole is formed in the center of the stop plate 15, and the stop plate 15 is inserted into the rotating shaft T, but the present invention is not limited to this. The mounting hole of the stop plate 15 can also be designed as a semicircular hole with one end open, and the stop plate 15 can be embedded into the rotating shaft T from above. The installation method of the stop plate 15 is relatively simple.

[0087] According to the cam transmission assembly 1 of the present invention, the axial displacement of the transmission cam 11 is prevented by sandwiching a stop plate 15 between the transmission cam 11 and the bearing B. There is no need to perform any reprocessing on the components of the cam transmission assembly 1, and there will be no impact on the performance of the cam transmission assembly 1.

[0088] In addition, the stop plate 15 has a simple structure and is easy to implement. It does not require special installation tools and is easy to install, which can significantly reduce costs.

[0089] The foregoing description has presented numerous features and advantages, including various alternative embodiments, and details of the structure and function of apparatus and methods. This description is intended to be illustrative and not exhaustive or limiting.

[0090] It will be apparent to those skilled in the art that various modifications may be made within the full scope indicated by the broad general meaning of the terms expressed in the appended claims, especially in terms of structure, elements, components, shape, size and arrangement of components, including combinations of these aspects within the scope of the principles described herein. To the extent that these various modifications do not depart from the spirit and scope of the appended claims, they are intended to be included therein.

Claims

1. A cam transmission assembly (1), comprising: A transmission cam (11) rotates around a rotation axis (T1) of a rotation shaft (T), and a gap exists between the transmission cam (11) and a bearing (B) supporting the rotation shaft (T). It is characterized by: The cam transmission assembly (1) further comprises a stop plate (15), which is arranged between the transmission cam (11) and the bearing (B) to keep the transmission cam (11) fixed in the direction of the rotation axis (T1).

2. The cam transmission assembly (1) according to claim 1, characterized in that The cam transmission assembly (1) further comprises an intermediate rotating member (12), one end of which is connected to the drive system, and the other end of which is inserted into the transmission cam (11) and connected to the rotating shaft (T). The stop plate (15) is matched with the transmission cam (11) and the intermediate rotating member (12) in shape so as to rotate together with the two.

3. The cam transmission assembly (1) according to claim 1 or 2, characterized in that: The stop plate (15) comprises: a transmission cam abutting portion (15a), wherein the transmission cam abutting portion (15a) abuts against the transmission cam (11); an intermediate rotating member abutting portion (15b), the intermediate rotating member abutting portion (15b) abutting against the intermediate rotating member (12); and A contact portion connecting portion (15c) contacts the bearing (B) and connects the transmission cam contact portion (15a) and the intermediate rotating member contact portion (15b).

4. The cam transmission assembly (1) according to claim 3, characterized in that The intermediate rotating member (12) is inserted into the transmission cam (11) and extends beyond the transmission cam (11) by a certain distance, thereby forming a height difference between the transmission cam (11) and the intermediate rotating member (12) in the direction of the rotation axis (T1). The abutment connection portion (15c) maintains contact with the intermediate rotating member (12) while bridging the height difference.

5. The cam transmission assembly (1) according to claim 3, characterized in that The contact portion connecting portion (15c) is formed as a protrusion protruding toward the bearing (B).

6. The cam transmission assembly (1) according to claim 5, characterized in that The protrusion is formed to have an arc-shaped or triangular cross-section when cut along a plane perpendicular to the vertical direction, and abuts against the bearing (B) in a line contact manner.

7. The cam transmission assembly (1) according to claim 3, characterized in that The surface of the transmission cam abutment portion (15a) is in contact with the surface of the transmission cam (11). The surface of the intermediate rotating member abutting portion (15b) is in contact with the surface of the intermediate rotating member (12).

8. The cam transmission assembly (1) according to claim 3, characterized in that A plurality of transmission cam abutment portions (15a) are attached to the intermediate rotating member abutment portion (15b).

9. The cam transmission assembly (1) according to claim 8, characterized in that The number of the transmission cam abutment portions (15a) is three and they are arranged along the circumferential direction of the rotation axis (T) at intervals of 90 degrees from each other.

10. The cam transmission assembly (1) according to claim 2, characterized in that The stop plate (15) is in a mirror-symmetrical shape relative to a plane formed by the central axis (O1) and the rotation axis (T1).

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