CN218152299U

CN218152299U - Actuator for a plurality of shift forks in a transmission and transmission

Info

Publication number: CN218152299U
Application number: CN202221769838.3U
Authority: CN
Inventors: 崔世波; 李辉
Original assignee: Kongsberg Automotive Wuxi Ltd
Current assignee: Kongsberg Automotive Wuxi Ltd
Priority date: 2022-07-08
Filing date: 2022-07-08
Publication date: 2022-12-27
Anticipated expiration: 2032-07-08

Abstract

An actuator for a plurality of shift forks in a transmission, comprising: a support connected to the housing; a drive system connected to the support and capable of outputting a primary motion for the fork, comprising a plurality of intermediate rotating members, the drive system transforming each primary motion into a rotary motion of a respective intermediate rotating member; still include interlock, it includes: a plurality of interlocking cams, each of which is mounted on a corresponding intermediate rotary member so as to follow the rotation of the intermediate rotary member between a neutral position corresponding to a fork-off position and a shift position corresponding to a fork-on position; and an interlocking pin between each two of the interlocking cams, the interlocking pin being capable of cooperating with the two interlocking cams to move relative to the transmission housing, the interlocking pin cooperating with the first interlocking cam to lock the second interlocking cam in the neutral position by cooperating with the second interlocking cam when the first interlocking cam is rotated away from the neutral position. The utility model discloses still relate to the derailleur including this actuator.

Description

Actuator for a plurality of shift forks in a transmission and transmission

Technical Field

The utility model relates to a machine-building field, concretely relates to a derailleur that is arranged in actuator of a plurality of shift forks in derailleur and includes this actuator.

Background

Mechanical transmissions are common devices in automotive drive trains, and are used to achieve specific gear positions in response to commands from a gear shifter. In the prior art, it is known to use various types of actuators to actuate the forks of the transmission from a disengaged position to a corresponding engaged position, so as to carry out a gear shift operation.

However, for a transmission such as a 4-speed transmission, where a plurality of shift forks are included, conflicting coordination between the respective shift forks cannot generally be accomplished by mechanical structures in the prior art. Alternatively, to avoid undesired collisions of the switching movements between the individual forks, complex mechanical mechanisms or preset complex control logic are required.

SUMMERY OF THE UTILITY MODEL

Based on the above technical problems in the prior art, the present invention is directed to an actuator for a transmission fork and a transmission including the same. According to the utility model discloses an actuator allows to avoid the conflict between each shift fork through simple mechanical mechanism, more specifically makes only one shift fork can leave the disconnected position simultaneously and move to the engaged position.

To this end, the present invention provides an actuator for a plurality of shift forks in a transmission, comprising:

a support for connection to a transmission housing; and

a drive system connected to the support, capable of outputting a respective original motion for each fork, the drive system comprising a plurality of intermediate rotating members, the drive system translating each of the original motions into a rotational motion of the respective intermediate rotating member, which in turn causes the respective fork to move between a disengaged position and an engaged position;

it is characterized in that the preparation method is characterized in that,

the actuator further comprises an interlock, the interlock comprising:

a plurality of interlock cams, each of which is mounted on a respective intermediate rotary member to rotate with the intermediate rotary member between a neutral position corresponding to the off position and a shift position corresponding to the on position; and

an interlock pin between each two interlock cams, the interlock pin being movable relative to the transmission case in cooperation with the two interlock cams,

the interlock device is configured such that when a first of the two interlock cams rotates away from the neutral position, the interlocking pin cooperating with the first interlock cam locks a second of the two interlock cams in the neutral position by cooperating with the second interlock cam.

According to a preferred embodiment of the actuator of the present invention, the interlocking pin is configured to be translatable back and forth along a line between the axes of rotation of the two interlocking cams.

In accordance with a preferred embodiment of the actuator of the present invention, the interlock further includes an interlock pin cartridge fixedly coupled with the transmission housing, the interlock pin cartridge defining an internal cavity for receiving and guiding the interlock pin.

According to a preferred embodiment of the actuator according to the present invention, the curved surface of the interlocking cam comprises a recess and a protrusion, the recess being aligned with the interlocking pin when the interlocking cam is in the neutral position, the protrusion of the first interlocking cam cooperating with the interlocking pin to jack the interlocking pin into the recess of the second of the two interlocking cams when the first of the two interlocking cams is in the shifting position.

According to a preferred embodiment of the actuator of the present invention, the actuator further comprises a rotation angle sensing system comprising:

a sensing gear engaged with a gear fixed to the intermediate rotating member to rotate following the intermediate rotating member;

a sensing magnet fixed relative to the sensing gear to rotate with the sensing gear; and

a rotation angle sensor fixed with respect to the support to sense a rotation angle of the intermediate rotating member by sensing a movement of the sensing magnet.

According to a preferred embodiment of the actuator of the present invention, the actuator comprises a main printed circuit board on which the controller for controlling the drive system and the rotation angle sensor are laid.

According to a preferred embodiment of the actuator of the present invention, the drive system outputs the primary motion by means of a motor, the main printed circuit board being arranged between the motor and the intermediate rotating member.

According to a preferred embodiment of the actuator of the present invention, each of the intermediate rotary members is fixedly provided with a shift fork cam, the shift fork cam cooperates with a cam follower on a shift fork to drive the shift fork to rotate, the intermediate rotary member is provided with an inner cavity, the inner cavity accommodates a biasing member, the biasing member is configured to be compressed between the intermediate rotary member and the cam follower when the interlocking cam is in the shift position and the shift fork is not yet movable to the engagement position due to interference and to be released to push the cam follower to push the shift fork to the engagement position when the interlocking cam is in the shift position and the shift fork is movable to the engagement position.

Furthermore, the utility model also provides a derailleur, include:

the actuator according to the above embodiment;

a fork actuated by the actuator; and

and the clutch comprises a moving part driven by the shifting fork to translate.

According to a preferred embodiment of the transmission of the present invention, the clutch is a dog clutch.

To sum up, the actuator of the present invention has technical advantages over the prior art in that:

1) The structure is compact, the weight is light, and the internal parts of the transmission are fewer;

2) The response is fast, and the power-off duration is reduced;

3) The clutch is quickly engaged, so that the transmission reliability is improved;

4) The shifting fork has low power consumption and energy conservation, thereby increasing mileage;

5) The unique mounting mode is favorable for the firmness of the transmission structure.

Drawings

This document includes the accompanying drawings to provide a further understanding of various embodiments. The accompanying drawings are incorporated in and constitute a part of this specification. The drawings illustrate various embodiments described herein, and together with the description serve to explain the principles and operations of the claimed subject matter.

With reference to the above purposes, the technical features of the invention are clearly described below, and the advantages thereof are apparent from the following detailed description with reference to the accompanying drawings, which illustrate by way of example a preferred embodiment of the invention, without limiting its scope.

In the drawings:

fig. 1 is a perspective view of a preferred embodiment of an actuator for a plurality of transmission forks and the corresponding transmission fork assembly operated thereby according to the present invention, wherein the actuator for operating two transmission forks is shown.

Fig. 2A and 2B are schematic front views of a preferred embodiment of an actuator for a plurality of transmission forks according to the present invention shown in fig. 1 in different states, wherein the fork cam cooperating with the corresponding fork is omitted in order to better show the operating state of the interlocking device; more specifically, fig. 2A shows two interlock cams each in a neutral position, and fig. 2B shows one interlock cam in a shift position (left side of fig. 2B) and one interlock cam locked in the neutral position (right side of fig. 2B).

List of reference numerals

110. Supporting member

120. Drive system

121. Motor with a stator and a rotor

122. Intermediate rotating member

123. Shifting fork cam

124. Inner cavity of intermediate rotating member

125. Biasing member

131. Interlocking cam

132. Interlocking pin

133. Interlocking pin barrel

141. Sensing gear

150. Main printed circuit board

200. Shifting fork

210. Cam follower

220. Fulcrum of shifting fork

Detailed Description

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

While the present invention will be described in conjunction with the exemplary embodiments, it will be appreciated that this description is not intended to limit the invention to those embodiments illustrated. On the contrary, the invention is intended to cover not only these exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the invention.

For convenience in explanation and accurate definition of the technical solutions of the present invention, the terms "upper", "lower", "inner" and "outer" are used to describe features of the exemplary embodiments with reference to the positions of these features as shown in the figures.

Referring now first to FIG. 1, an actuator for a plurality of shift forks in a transmission is illustrated. Such actuators are typically installed in some specific type of transmission.

As can be seen in fig. 1, such transmissions generally comprise at least a fork 200 actuated by the actuator, in addition to the actuator itself. And although not explicitly shown in fig. 1, such transmissions typically also include a clutch that is carried by a shift fork 200.

More specifically, such a clutch may include a moving part that is translated by the fork 200. The moving part can take various possible forms, such as a disk with teeth on both sides, etc., and will not be described further here. It is noted that while the actuator of the present invention is particularly preferably applicable to transmissions including dog clutches, it is to be understood that the actuator of the present invention is equally applicable to actuating a variety of clutches capable of being driven by movement of a shift fork.

In a preferred case of a dog clutch, the dog-toothed clutch disc may cooperate with the prongs of the fork 200 via circumferentially arranged grooves thereof, so that rotation and/or translation of the fork 200 can drive the clutch disc to translate along its axis, thereby engaging different gears.

Returning to fig. 1, the preferred embodiment of the actuator according to the present invention described above comprises: support 110, drive system 120, and an interlock.

Wherein the carrier 110 is for connection to a transmission housing (not shown in fig. 1). It is to be noted that fig. 1 only schematically illustrates one possible configuration and arrangement of the support 110, and that a person skilled in the art will be able to select various suitable supports 110 for supporting the actuator relative to the variator, depending on the actual requirements.

The drive system 120 is connected, e.g., removably fixedly connected, to the support 110. The drive system 120 is able to output the original motion separately for each fork 200. In the preferred embodiment shown in fig. 1, the drive system 120 may output the original rotational motion by a motor 121, preferably an electric rotary motor. Of course, those skilled in the art can select various other driving members to output various original motions according to actual requirements, and details are not described herein.

More specifically, for the two forks 200 shown in fig. 1, the actuator may comprise two sets of drive systems 120, or even two sets of completely symmetrical drive systems 120.

The drive system 120 includes a plurality of intermediate rotating members 122, and the drive system 120 translates each of the original motions into a rotational motion of the corresponding intermediate rotating member 122. Preferably, the drive system 120 may translate each of the primary motions into a rotational motion of the corresponding intermediate rotary member 122 through a gear train.

The intermediate rotary member 122 in turn causes the respective fork 200 to move between the disengaged position and the engaged position. In the preferred embodiment shown in fig. 1, a fork cam 123 may be fixedly provided on each intermediate rotating member 122. Fork cam 123 cooperates with a cam follower 210 on fork 200 to drive fork 200 in rotation, and in particular fork 200 in fig. 1 about its fulcrum 220.

Returning to fig. 1, and referring to fig. 2A and 2B together, the interlock device includes: a plurality of interlocking cams 131 and interlocking pins 132 between each two interlocking cams 131.

Each interlock cam 131 is mounted on the corresponding intermediate rotary member 122 to follow the rotation of the intermediate rotary member 122 between a neutral position corresponding to the off position and a shift position corresponding to the on position. Thus, for the actuator comprising two sets of drive systems 120 in fig. 1 and thus two intermediate rotary members 122, the actuator comprises two interlocking cams 131 and one interlocking pin 132 between the two interlocking cams 131.

The interlocking pins 132 are capable of moving relative to a transmission case (not shown) in cooperation with the two interlocking cams 131.

The interlock device is configured such that, when a first of the two interlock cams 131 (for example, the left interlock cam 131 in fig. 2A and 2B) is rotated away from the neutral position (see fig. 2B), the interlock pin 132 that cooperates with the first interlock cam locks a second of the two interlock cams 131 (for example, the right interlock cam 131 in fig. 2A and 2B) in the neutral position by cooperating with the second interlock cam even if the second interlock cam cannot be shifted to the shift position away from its neutral position.

With continued reference to the figures, it can be seen that the interlock pin 132 may preferably be configured to translate back and forth along a line between the axes of rotation of the two interlock cams 131. However, it can be understood by those skilled in the art that the shape of the interlocking pin 132 and the movement thereof are not limited thereto as long as it can be satisfied that one out of the neutral position interlocking cam 131 is pushed to lock the other out of the neutral position interlocking cam 131.

More preferably, and as shown in the figures, the interlock device may further include an interlock pin 133 fixedly coupled with the transmission housing. The interlock pin barrel 133 may define an interior cavity for receiving and guiding the interlock pin 132. In the preferred embodiment of fig. 1, the interlock pin barrel 133 is a generally cylindrical object defining a cylindrical interior cavity to accommodate the interlock pin 132 for translational movement therein.

Referring to the drawings, and as best shown in fig. 2A and 2B, the curved surface of the interlock cam 131 includes a concave portion and a convex portion. The arrangement of the concave and convex portions of the interlock cam 131 is such that when the interlock cam 131 is in the neutral position, its concave portion is aligned with the interlock pin 132 (see, for example, the two interlock cams 131 in fig. 2A and the right interlock cam 131 in fig. 2B), and when a first of the two interlock cams 131 is in the shift position (see, for example, the left interlock cam 131 in fig. 2B), the convex portion of the first interlock cam cooperates with the interlock pin 132 to push the interlock pin 132 into the concave portion of a second of the two interlock cams (see, for example, the right interlock cam 131 in fig. 2B).

More preferably, to better drive the yoke to drive the clutch to the engaged position, an internal cavity 124 (see fig. 2A and 2B) may be formed in the intermediate rotating member 120. The lumen 124 receives a biasing member 125 therein. The biasing member 125 may preferably be a compression spring. The biasing member 125 is configured such that when the interlock cam 131 is in the shifting position and the fork 200 has not been able to move to the engaged position due to interference, the biasing member 125 is compressed between the intermediate rotary 122 and the cam follower 210, and when the interlock cam 131 is in the shifting position and the fork 200 is able to move to the engaged position, the biasing member 125 is released to push the cam follower 210 to push the fork 200 to the engaged position.

Furthermore, to better control the actuator of the present invention, the actuator may further comprise a rotational angle sensing system. Referring to fig. 1, the rotation angle sensing system may include: a sensing gear 141, a sensing magnet (not shown in the drawings), and a rotation angle sensor (not shown in the drawings).

Wherein the sensing gear 141 is engaged with a gear fixed on the intermediate rotating member 122 to rotate following the intermediate rotating member 122, that is, the rotation of the sensing gear 141 can reflect the rotation of the intermediate rotating member 122. The sensing magnet is fixed relative to the sensing gear 141 to rotate following the sensing gear 141, i.e. the rotation of the sensing magnet can also reflect the rotation of the intermediate rotation member 122. The rotation angle sensor is fixed with respect to the support 100 to sense the rotation angle of the intermediate rotary member 122 by sensing the movement of the sensing magnet.

In the preferred embodiment shown in fig. 1, the actuator comprises a main printed circuit board 150. The controller for controlling the driving system 120 and the above-mentioned rotation angle sensor may be disposed on the main printed circuit board 150, so that the functions of the main printed circuit board 150 are fully utilized. In a preferred embodiment shown in fig. 1, a main printed circuit board 150 may be disposed between the motor 121 and the intermediate rotary member 122.

While the preferred embodiments of the present invention have been described in detail above, it should be understood that aspects of the embodiments can be modified, if necessary, to employ aspects, features and concepts of the various patents, applications and publications to provide yet further embodiments.

These and other changes can be made to the embodiments in light of the above detailed description. In general, in the claims, the terms used should not be construed to be limited to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which such claims are entitled.

Claims

1. An actuator for a plurality of shift forks in a transmission, comprising:

a support for connection to a transmission housing; and

a drive system connected to the support, able to output a respective original motion for each fork, the drive system comprising a plurality of intermediate rotates, the drive system transforming each of the original motions into a rotary motion of a respective intermediate rotate, the intermediate rotates in turn causing the respective fork to move between a disengaged position and an engaged position;

it is characterized in that the preparation method is characterized in that,

the actuator further comprises an interlock, the interlock comprising:

a plurality of interlocking cams, each of which is mounted on a corresponding intermediate rotating member so as to rotate with the intermediate rotating member between a neutral position corresponding to the off position and a shift position corresponding to the on position; and

2. The actuator as set forth in claim 1,

it is characterized in that the preparation method is characterized in that,

the interlock pin is configured to translate back and forth along a line between the axes of rotation of the two interlock cams.

3. The actuator as set forth in claim 1,

it is characterized in that the preparation method is characterized in that,

the interlock device also includes an interlock pin barrel fixedly coupled with the transmission housing, the interlock pin barrel defining an internal cavity for receiving and guiding the interlock pin.

4. The actuator as set forth in claim 1, wherein,

it is characterized in that the preparation method is characterized in that,

the curved surface of the interlock cam includes a concave portion and a convex portion, the concave portion is aligned with the interlock pin when the interlock cam is in the neutral position, and the convex portion of the first interlock cam cooperates with the interlock pin to eject the interlock pin into the concave portion of the second of the two interlock cams when the first of the two interlock cams is in the shift position.

5. The actuator as set forth in claim 1, wherein,

it is characterized in that the preparation method is characterized in that,

the actuator further includes a rotational angle sensing system including:

6. The actuator as set forth in claim 5,

it is characterized in that the preparation method is characterized in that,

the actuator comprises a main printed circuit board, and a controller for controlling the driving system and the rotation angle sensor are distributed on the main printed circuit board.

7. The actuator as set forth in claim 6,

it is characterized in that the preparation method is characterized in that,

the drive system outputs the primary motion through a motor, the main printed circuit board being disposed between the motor and the intermediate rotating member.

8. The actuator as set forth in claim 1,

it is characterized in that the preparation method is characterized in that,

each middle rotating piece is fixedly provided with a shifting fork cam, the shifting fork cam is matched with a cam follower on a shifting fork to drive the shifting fork to rotate, an inner cavity is formed in each middle rotating piece, a biasing member is accommodated in the inner cavity, the biasing member is configured to be compressed between the middle rotating piece and the cam follower when the interlocking cam is located at the shifting position and the shifting fork cannot move to the engagement position due to interference, and the biasing member is released to push the cam follower to push the shifting fork to the engagement position when the interlocking cam is located at the shifting position and the shifting fork can move to the engagement position.

9. A kind of speed-changing device is disclosed,

it is characterized in that the preparation method is characterized in that,

the method comprises the following steps:

an actuator according to any one of claims 1 to 8;

a fork actuated by the actuator; and

10. The transmission of claim 9, wherein the first and second drive wheels,

it is characterized in that the preparation method is characterized in that,

the clutch is a dog clutch.