KR20200047092A - Dog clutch device for automatic transmission - Google Patents

Abstract

A dog clutch device for a transmission is disclosed. An embodiment of the present invention provides the dog clutch device for a transmission, which transmits rotational power between first and second rotating elements, comprising: a clutch case fixated to a transmission housing by corresponding to an external end portion of the first rotating element, and integrated with a piston housing having a hydraulic operating chamber by corresponding to the inside of the rotational center of an external end portion of the first rotating element; a clutch piston installed in the hydraulic operating chamber to operate backwards and forwards according to hydraulic pressure controlled and supplied to the hydraulic operating chamber through a plurality of flow paths formed within the clutch case; and a dog clutch rotatably installed at an inner end portion of the clutch piston to be bidirectionally movable along the axis within the rotational center of the first rotating element so that the first and second rotating elements are selectively coupled by a tooth shape structure. According to the dog clutch device for a transmission, a stable power transmission between rotating elements is possible.

Description

Dog clutch device for transmission {DOG CLUTCH DEVICE FOR AUTOMATIC TRANSMISSION}

The present invention relates to a dog clutch device for a transmission, more specifically, there is no need to control the centrifugal hydraulic pressure of the working fluid, enabling stable power transmission between rotating elements without increasing the weight and electric field, and of the pump by oil leak. It relates to a dog clutch device for a transmission that minimizes the drive loss.

Eco-friendly technology in vehicles is a key technology for the survival of the future automobile industry. Recently, as exhaust gas regulations have been intensified, automakers are focusing on developing eco-friendly vehicles through environmental regulations and improved fuel economy.

In order to achieve such a fuel efficiency improvement goal, various studies such as a high-efficiency engine, a high-efficiency transmission, and a lightweight body have been actively conducted. In particular, in the transmission field, double clutch transmission that combines the efficiency of a manual transmission and the convenience of an automatic transmission, and automation Development of manual transmissions and the like has been actively conducted.

These transmissions are selectively connected to the transmission housing by means of a dry or wet brake to connect to the transmission housing. In particular, the brakes applied to double clutch transmissions and automatic manual transmissions do not go through a torque converter like brakes of automatic transmissions. Since the engine torque transmitted directly from the engine is stopped, a great coupling force and control precision are required.

On the other hand, in double-clutch transmissions and automated manual transmissions, especially, clutches configured to connect power to each other with rotating elements made of shafts or gears, etc., inside the transmission housing with a small internal space, include clutch drums, clutch hubs, friction materials, pistons , It is necessary to increase the number of parts such as return spring, spring retainer, snap ring, etc., which has a disadvantage that leads to an increase in the overall weight and length of the transmission.

In addition, although the synchronizer is applied for the purpose of power transmission in a manual or automatic transmission, the clutch or synchronizer synchronizes two rotating elements having a relative speed using a friction material, with respect to heat generated at this time. There are not only a few difficulties in designing to be durable, but in particular, the power loss is a drawback due to drag loss during non-operation or oil leakage due to hydraulic formation during operation.

An embodiment of the present invention is configured such that there is no relative rotation of the clutch piston with respect to the piston housing configured in the clutch case, so that the dog clutch can be operated and released without a separate configuration for centrifugal hydraulic pressure control of the working fluid, and the weight and length An object of the present invention is to provide a dog clutch device for a transmission that enables stable power transmission between rotating elements without an increase of.

In addition, an embodiment of the present invention is a dog clutch device for a transmission that minimizes driving loss of a pump due to an oil leak by allowing a working fluid to be supplied to a sealed operation and release chamber through a flow path formed inside the clutch case and the piston housing. Want to provide.

In addition, an embodiment of the present invention is to provide a dog clutch device for a transmission that eliminates drag loss due to no slip control between friction elements as in a conventional wet clutch, and has excellent transmission direct connection feeling, thereby reducing the shift time.

In one or more embodiments of the present invention, in a dog clutch device for a transmission that transmits rotational power between first and second rotating elements, the dog clutch device for a transmission is fixed to a transmission housing corresponding to an outer end portion of the first rotating element, and A clutch case in which a piston housing having a hydraulic operation chamber is integrally formed corresponding to the inside of the rotation center of the outer end of the first rotating element; A clutch piston which is installed in the hydraulic operation chamber and moves forward and backward according to hydraulic pressure supplied to and controlled by the hydraulic operation chamber through a plurality of flow paths formed in the clutch case; And a dog clutch rotatably installed at an inner end of the clutch piston so as to selectively move the first and second rotating elements by a tooth structure and move in both directions along an axis inside the rotation center of the first rotating element. Dog clutch device for a transmission comprising a can be provided.

Here, the tooth structure is a first tooth formed along an inner circumferential surface inside the center of rotation of the inner end of the first rotating element; A second tooth formed along the outer circumferential surface of the second rotating element; A third tooth formed along an outer circumferential surface of the inner end portion of the dog clutch and always engaged with the first tooth; And a fourth tooth formed along an inner circumferential surface of the inner end portion of the dog clutch and selectively meshing with the second tooth.

In addition, the dog clutch device for the transmission may further include a piston retainer that is installed in a sealed state between the inner end surface of the piston housing and the clutch piston to form the interior of the piston housing as a hydraulic operation chamber.

Here, the piston retainer may be configured to limit the stroke in the operating direction of the clutch piston by a snap ring installed on the inner surface of the piston housing.

In addition, the hydraulic operation chamber may be divided into an operation chamber and a release chamber by the clutch piston.

The plurality of flow paths are formed in the clutch case, the first flow path connected to the operation chamber; And a second flow path formed by connecting the inside of the clutch case and the inside of the piston housing and connected to the release chamber.

In addition, the plurality of flow paths are formed in the clutch case, the first flow path is connected to the operation chamber; And a second flow path connected to the release chamber through a seal pipe inserted into the center of the outer end of the clutch piston and a connection hole formed in the clutch piston inside the clutch case.

The dog clutch is rotatably fitted to the outer end of the clutch piston, and both sides may be rotationally supported by each bearing that is regulated by the clutch piston by a bearing retainer.

In addition, the first rotating element is installed to be rotatably connected to one end of a third rotating element that is rotationally supported through a bearing between the clutch case and surrounding the piston housing, and an external gear is formed on the outer circumferential side. Can be.

In addition, the second rotating element may be formed of a rotating gear rotatably through a bearing at one end of the rotating shaft.

The dog clutch device according to an embodiment of the present invention is installed so that the dog clutch is rotated and supported through a bearing in the rod portion of the clutch piston, so that the relative rotation between the clutch piston and the piston housing does not occur, thereby operating within the piston housing. Since the centrifugal hydraulic pressure is not generated in the fluid, there is no need for a separate configuration to control it, thereby minimizing the components, thereby minimizing the weight and length, and enabling stable power transmission between rotating elements.

In addition, the dog clutch device according to an embodiment of the present invention can supply the working fluid to the sealed operation and release chamber through the flow path formed inside the clutch case and the piston housing, thereby minimizing the drive loss of the pump due to oil leakage. have.

In addition, the dog clutch device according to an embodiment of the present invention has the effect of eliminating the friction material, so that there is no power loss due to drag, and the feeling of direct shifting is excellent and the shifting time is shortened.

1 is a cross-sectional view of a dog clutch device for a transmission according to a first embodiment of the present invention.
2 and 3 are a state diagram of the engagement and release operation of the dog clutch device for a transmission according to the first embodiment of the present invention.
4 is a cross-sectional view of a dog clutch device for a transmission according to a second embodiment of the present invention.
5 and 6 is a state diagram of the engagement and release operation of the dog clutch device for a transmission according to a second embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail through the accompanying drawings.

However, in order to clearly describe an embodiment of the present invention, parts irrelevant to the description are omitted, and the same reference numerals are applied to the same or similar components throughout the specification.

In the following description, the names of the components are divided into first and second, and the names of the components are the same to distinguish them, and are not necessarily limited to the order.

1 is a cross-sectional view of a dog clutch device for a transmission according to a first embodiment of the present invention.

Referring to FIG. 1, a dog clutch device for a transmission according to a first embodiment of the present invention is configured to transmit rotational power between first and second rotating elements N1 and N2.

Here, the first rotating element (N1) may be made of an external gear that is rotatably installed with respect to the clutch case 11 is formed with a gear on the outer circumferential side.

That is, the first rotating element (N1) is a third rotationally supported through the bearing (B1) between the clutch case 11 while surrounding the piston housing (13) formed inside the clutch case (11) It is fixedly connected to one end of the rotating element (N3) and is rotatably installed.

The first rotating element N1 may be externally meshed with a circumscribed gear or the like on another axis to be connected to power.

In addition, the second rotating element (N2) is made of a rotating gear rotatably installed through a bearing (B2) at one end of the rotating shaft (S).

As described above, the dog clutch device for a transmission according to the first embodiment of the present invention, which transmits rotational power between the first and second rotating elements N1 and N2, includes a clutch case 11 and a clutch piston 15 And a dog clutch 21.

The clutch case 11 is fixed to a transmission housing (not shown) corresponding to the outer end of the first rotating element N1, and hydraulically operated in correspondence to the inner rotational center of the outer end of the first rotating element 11 The piston housing 13 having the seal C is integrally formed.

Here, in consideration of the fact that the clutch case 11 positioned on the right side in FIG. 1 is fixed to the transmission housing (not shown), the outer end portion and the inner end portion applied to the concept corresponding thereto correspond to the right side outward with reference to FIG. 1. Set, the left side where the rotating shaft S is located is set to the inside, from which the outer end is defined as the outer end and the inner end is defined as the inner end.

The clutch piston 15 is installed in the hydraulic operation chamber (C) to the hydraulic pressure supplied to the hydraulic operation chamber (C) through the two flow paths (L1) (L2) formed inside the clutch case (11) Accordingly, while operating in the forward and backward direction, the dog clutch 21 is made to operate and be controlled.

At this time, the clutch piston 15 is made of an integral type in which the piston portion 15a and the rod portion 15b are integrally formed, and hydraulic operation is performed by a piston retainer 17 installed inside the piston housing 13 The sealing structure inside the seal (C) is made.

That is, the piston retainer 17 is installed in a sealed state between the inner surface of the inner end portion of the piston housing 13 and the rod portion 15b of the clutch piston 15 to seal the interior of the piston housing 13. It is formed as a closed hydraulic operation chamber (C).

The piston retainer 17 is configured to limit the stroke in the working direction of the clutch piston 15 by a snap ring SR installed on the inner surface of the piston housing 13.

And the hydraulic operation chamber (C) is divided into an operation chamber (C1) and a release chamber (C2) by the piston portion (15a) of the clutch piston (15).

In addition, the two flow paths formed inside the clutch case 11 are formed inside the clutch case 11 and connected to the operation chamber C1, the first flow path L1 and the clutch case 11 ) Is formed by connecting the inside of the piston housing 13 and the second flow passage L2 connected to the release chamber C2.

 The dog clutch 21 is rotatably installed on the inner end of the clutch piston 15 so as to be movable in both directions along an axis inside the center of rotation of the first rotating element N1, the first and second rotations The elements N1 and N2 act to be selectively joined by the tooth structure.

Here, the tooth structure is a first tooth (T1) is formed along the inner circumferential surface inside the inner center of rotation of the first rotating element (N1), the second along the outer circumferential surface of the second rotating element (N2) Tooth shape T2 is formed.

In addition, a third tooth T3 is formed along the outer circumferential surface of the inner end portion 21a of the dog clutch 21, and the third tooth T3 is always engaged with the first tooth T1.

Further, a fourth tooth T4 is formed along the inner circumferential surface of the inner end portion 21a of the dog clutch 21, and the fourth tooth T4 is selectively engaged with the second tooth T2.

At this time, the second teeth (T2) is the first teeth (T1) so that each teeth (T3) (T4) of the dog clutch 21 can be entered and engaged between the first teeth (T1) The diameter is smaller than that.

The dog clutch 21 is rotatably fitted to the outer end portion on the rod portion 15b of the clutch piston 15, corresponding to both sides of the dog clutch 21 by the two-sided bearing retainer 19 Each of the bearings B3 regulated by the rod portion 15b of the clutch piston 15 is rotationally supported and installed.

Accordingly, even if the dog clutch 21 rotates together by combining the first and second rotating elements N1 and N2 by the operation of the clutch piston 15, the clutch piston 15 remains in the rotational direction. Maintains a fixed state so that the centrifugal hydraulic pressure is not generated inside the hydraulic operation chamber C.

2 and 3 are a state diagram of the engagement and release operation of the dog clutch device for a transmission according to the first embodiment of the present invention.

Referring to FIG. 2, when the coupling operation of the dog clutch device is described, when hydraulic pressure is supplied to the operation side chamber C1 through the first flow path L1, the clutch piston 15 is coupled with the dog clutch 21. Move forward to the left in the drawing.

Then, the dog clutch 21 maintains a state where the third tooth T3 meshes with the first tooth T1 of the first rotation element N1 while the fourth tooth T4 has the second rotation element N2. ) Is engaged with the second tooth (T2) of the first and second rotating elements (N1) (N2) so that power transmission is possible between each other.

At this time, even if the dog clutch 21 rotates together by combining the first and second rotating elements N1 and N2, it is possible to rotate through the bearing B3 on the rod portion 15b on the clutch piston 15. It is installed so as not to rotate the clutch piston (15).

Referring to Figure 3, when explaining the release operation of the dog clutch device, when the hydraulic pressure is supplied to the release side chamber (C2) through the second flow path (L2), the clutch piston 15 together with the dog clutch (21) Move backward to the right in the drawing.

Then, the dog clutch 21 maintains a state where the third tooth T3 meshes with the first tooth T1 of the first rotation element N1 while the fourth tooth T4 has the second rotation element N2. ) Is disengaged from the second tooth T2 so that the power connection state between the first and second rotation elements N1 and N2 is released.

4 is a cross-sectional view of a dog clutch device for a transmission according to a second embodiment of the present invention.

Referring to FIG. 4, the dog clutch device according to the second embodiment of the present invention provides a second pressure for supplying hydraulic pressure to the release side chamber C2 in order to release the dog clutch 21 as compared with the first embodiment. The only difference is the Euro (L2).

That is, the second flow path L2 of the dog clutch device according to the first embodiment of the present invention connects the interior of the clutch case 11 and the interior of the piston housing 13 to the release chamber C2. On the other hand, the second flow path L2 of the dog clutch device according to the second embodiment of the present invention is connected to the seal pipe 23 and the clutch piston 15 that are fitted to the outer end of the clutch piston 15 The difference is that the hole H is added.

That is, in the two flow paths of the dog clutch device according to the second embodiment of the present invention, a first flow path L1 is formed inside the clutch case 11 and is connected to the operation chamber C1.

In addition, the second flow path L2 is fixed to the clutch case 11 by inserting a seal pipe 23 into the center of the piston piston 15a of the clutch piston 15, and inside the clutch case 11 It is connected to the release chamber (C2) through a connecting hole (H) formed in the piston portion (15a) of the clutch piston (15) via the seal pipe (23).

5 and 6 is a state diagram of the engagement and release operation of the dog clutch device for a transmission according to a second embodiment of the present invention.

Referring to FIG. 5, when the coupling operation of the dog clutch device is described, when hydraulic pressure is supplied to the operation side chamber C1 through the first flow path L1, the clutch piston 15 is coupled with the dog clutch 21. Move forward to the left in the drawing.

Then, the dog clutch 21 maintains a state where the third tooth T3 meshes with the first tooth T1 of the first rotation element N1 while the fourth tooth T4 has the second rotation element N2. ) Is engaged with the second tooth (T2) of the first and second rotating elements (N1) (N2) so that power transmission is possible between each other.

At this time, even if the dog clutch 21 rotates together by combining the first and second rotating elements N1 and N2, it is possible to rotate through the bearing B3 on the rod portion 15b on the clutch piston 15. It is installed so as not to rotate the clutch piston (15).

Referring to Figure 6, when explaining the release operation of the dog clutch device, when the hydraulic pressure is supplied to the release side chamber (C2) through the second flow path (L2) and the seal pipe 23 and the connection hole (H), the clutch The piston 15 moves backward with the dog clutch 21 to the right in the figure.

Then, the dog clutch 21 maintains a state where the third tooth T3 meshes with the first tooth T1 of the first rotation element N1 while the fourth tooth T4 has the second rotation element N2. ) Is disengaged from the second tooth T2 so that the power connection state between the first and second rotation elements N1 and N2 is released.

As described above, the dog clutch device according to the embodiment of the present invention is installed in the piston housing 13 integrally formed with the clutch case 11 so that the clutch piston 15 is installed so as to be able to move forward and backward and is closed to the hydraulic operating chamber C ) To minimize the number of parts by simply configuring the dog clutch 21 to operate and release control according to the hydraulic pressure supplied to it, thereby enabling stable power transmission between rotating elements without increasing weight and length.

In addition, the clutch piston 15 even when the dog clutch 21 connects power between rotating elements by rotatably supporting the dog clutch 21 through the bearing B3 to the rod portion 15b of the clutch piston 15 Since there is no relative rotation with respect to the piston housing 13, the generation of centrifugal hydraulic pressure in the working fluid can be prevented.

In addition, through the first and second flow paths L1 and L2 formed inside the clutch case 11 and the piston housing 13, hydraulic pressure can be supplied to the closed operation and release chambers C1 and C2. This prevents pump loss due to oil leakage.

In addition, the friction material applied to the conventional wet friction clutch is excluded, and thus there is no power loss due to drag, the shift direct connection feeling is excellent, and the shift time can be shortened.

Although the preferred embodiments of the present invention are disclosed above, the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains from the embodiments of the present invention can be easily invented and recognized as equivalent. This includes all changes to the scope.

11: Clutch case
13: piston housing
15: clutch piston
15a: piston
15b: rod
17: piston retainer
19: bearing retainer
21: dog clutch
23: Seal pipe
L1, L2: first and second flow paths
SR: Snap ring
N1, N2, N3: first, second, third rotating elements
C: Hydraulic operating room
C1: Operation side chamber
C2: Release side chamber
B1, B2, B3: bearing
T1, T2, T3, T4: 1st, 2nd, 3rd, 4th teeth
S: rotating shaft

Claims (10)

In the dog clutch device for a transmission that transmits rotational power between the first and second rotating elements,
A clutch case fixed to a transmission housing corresponding to an outer end portion of the first rotating element, and a piston housing integrally formed with a hydraulic operation chamber corresponding to an inner rotation center of the outer rotating element;
A clutch piston which is installed in the hydraulic operation chamber and moves forward and backward according to hydraulic pressure supplied to and controlled by the hydraulic operation chamber through a plurality of flow paths formed in the clutch case; And
A dog clutch rotatably installed at an inner end of the clutch piston to be movable in both directions along an axis inside the rotation center of the first rotating element so that the first and second rotating elements are selectively coupled by a tooth structure;
Dog clutch device for a transmission comprising a. According to claim 1,
The tooth structure
A first tooth formed along an inner circumferential surface inside the center of rotation of the inner end of the first rotating element;
A second tooth formed along the outer circumferential surface of the second rotating element;
A third tooth formed along an outer circumferential surface of the inner end portion of the dog clutch and always engaged with the first tooth; And
A fourth tooth formed along an inner circumferential surface of the inner end portion of the dog clutch and selectively meshing with the second tooth;
Dog clutch device for a transmission consisting of. According to claim 1,
The transmission dog clutch device is
A dog clutch device for a transmission, further comprising a piston retainer installed in a sealed state between the inner end surface of the piston housing and the clutch piston to form the interior of the piston housing as a hydraulic operation chamber. According to claim 3,
The piston retainer
A dog clutch device for a transmission configured to limit a stroke in an operating direction of the clutch piston by a snap ring installed on an inner surface of the piston housing. According to claim 1,
The hydraulic operation room
A dog clutch device for a transmission that is divided into an operation chamber and a release chamber by the clutch piston. The method of claim 5,
The plurality of flow paths
A first flow path formed inside the clutch case and connected to the operation chamber; And
A second flow path formed by connecting the inside of the clutch case and the inside of the piston housing to be connected to the release chamber;
Dog clutch device for a transmission consisting of. The method of claim 5,
The plurality of flow paths
A first flow path formed inside the clutch case and connected to the operation chamber; And
A second flow path connected to the release chamber through a seal pipe inserted into the center of the outer end portion of the clutch piston and a connection hole formed in the clutch piston inside the clutch case;
Dog clutch device for a transmission consisting of. According to claim 1,
The dog clutch
A dog clutch device for a transmission that is rotatably fitted to an outer end portion of the clutch piston, and that both sides are rotationally supported by each bearing regulated by the clutch piston by a bearing retainer. According to claim 1,
The first rotating element
A dog clutch for a transmission comprising a circumferential gear that is fixedly connected to one end of a third rotating element that is rotated and supported through a bearing between the clutch case and surrounding the piston housing, and a gear is formed on the outer circumferential side. Device. According to claim 1,
The second rotating element
A dog clutch device for a transmission made of a rotating gear so as to be rotatable through a bearing at one end of a rotating shaft.

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