JP5675300B2 - Engagement device - Google Patents

Description

  The present invention relates to an engagement device that drives two engagement mechanisms with a single actuator.

  As a hybrid vehicle drive device including an internal combustion engine and two motor / generators, a brake for locking the first motor / generator and a clutch for separating the second motor / generator are provided, and the vehicle speed is relatively high. It is known that the first motor / generator is locked and the second motor / generator is disconnected to switch to a mode in which the power of the internal combustion engine is directly transmitted to drive wheels (Patent Document 1). Also, as an engagement mechanism for locking the motor / generator, a drive provided with a so-called cam clutch that uses an axial thrust generated by relative rotation of a pair of cam members to increase the pressing force against the engagement target. An apparatus also exists (Patent Document 2). In addition, Patent Documents 3 to 5 exist as prior art documents related to the present invention.

JP 2003-104072 A JP 2010-52517 A JP 2005-192284 A JP 2005-291439 A JP 2008-51142 A

  Various mechanisms can be adopted as an engagement mechanism such as a brake or a clutch of the drive device of Patent Document 1. For example, when the first motor / generator is locked by the cam clutch disclosed in Patent Document 2, relative angular rotation occurs between the cam members when an angular acceleration exceeding the limit is input during release as a characteristic of the cam clutch. There is a problem that unintentional engagement, that is, erroneous engagement occurs.

  Then, an object of this invention is to provide the engagement apparatus which can suppress generation | occurrence | production of misengagement.

The engagement device of the present invention includes a pair of cam members that are combined so as to be relatively rotatable around a common axis and that are integrally rotatable with a transmission shaft that transmits power, and the pair of cam members includes Engagement in which one cam member of the pair of cam members is pressed against the engagement target by the released state separated from the engagement target and the axial force generated by the relative rotation of the pair of cam members A cam-type engagement mechanism that can be switched by moving the one cam member in the direction of the axis, a pair of engagement members, and an engagement state in which the pair of engagement members mesh with each other; A meshing engagement mechanism that is switchable by moving any one of the pair of meshing members between a released state in which the pair of meshing members are separated from each other; A connecting member that connects the one cam member of the cam-type engagement mechanism and the one engagement member of the mesh-type engagement mechanism, and the mesh-type when the cam-type engagement mechanism is in the released state. The one of the coupling members connected by the coupling member so that the engagement mechanism is in the engagement state and the meshing engagement mechanism is in the release state when the cam type engagement mechanism is in the engagement state. A single actuator capable of simultaneously operating the cam member and the one engagement member; and the pair of engagement members so that the engagement of the pair of engagement members is difficult to be released when the engagement engagement mechanism is in the engagement state. A release restraining mechanism that restricts movement of the meshing member (claim 1).

  As a characteristic of the cam-type engagement mechanism, when angular acceleration exceeding a limit is input in a non-engaged state, a relative rotation between the cam members may occur unintentionally, resulting in erroneous engagement. However, according to this engagement device, the cam member and the meshing member are coupled by the coupling member, and when the cam type engagement mechanism is in the released state, the meshing type engagement mechanism is driven into the engagement state, and the meshing type is engaged. When the engagement mechanism is in the engaged state, the engagement of the engagement member is hardly released by the release suppression mechanism. Therefore, as a result of the difficulty in releasing the engagement of the engagement member of the engagement type engagement mechanism, the cam type engagement mechanism simultaneously restricts the movement of the cam mechanism. That is, it is difficult to release the meshing engagement mechanism by the release suppression mechanism, and at the same time, the occurrence of erroneous engagement of the cam engagement mechanism can be suppressed.

  In one aspect of the engagement device of the present invention, the pair of meshing members have teeth that mesh with each other, and the release suppressing mechanism includes a tapered portion that is inclined with respect to the moving direction of the pair of meshing members. It may be configured by having the part (claim 2). According to this aspect, since the movement of the meshing member is restricted by the tapered portion provided in the tooth portion, the meshing of the meshing member is difficult to be released in the released state.

  In one aspect of the engagement device of the present invention, the release suppression mechanism includes a recess formed in the one engagement member and a lock member that can be fitted into the recess, and the engagement engagement mechanism is In the engaged state, a lock mechanism may be provided that restricts movement of the one meshing member by fitting the lock member into the recess. According to this aspect, since the locking mechanism restricts the movement of the meshing member, the meshing of the meshing member is hardly released in the released state.

  As described above, according to the engagement device of the present invention, the cam member and the meshing member are coupled by the coupling member, and the meshing engagement mechanism is brought into the engagement state when the cam type engagement mechanism is in the released state. When the engagement type engagement mechanism is driven and the engagement type engagement mechanism is in the engaged state, the engagement of the engagement member is made difficult to be released by the release suppression mechanism. The occurrence of erroneous engagement of the combined mechanism can be suppressed.

The figure which showed schematically the principal part of the drive device to which the engaging apparatus which concerns on a 1st form was applied. Explanatory drawing which showed typically the state which looked at the meshing type engagement mechanism from the arrow II direction of FIG. The figure which showed the engagement operation | movement of the engagement apparatus from a releasing state to an engaging state, Comprising: The figure which showed the case where a cam type engaging mechanism is a releasing state. It is the figure which showed the engagement operation | movement of the engagement apparatus until a cam type engagement mechanism changes from a release state to an engagement state, Comprising: It is a transient state until a cam type engagement mechanism changes from a release state to an engagement state. The figure which showed the case. The figure which showed the engagement operation | movement of the engagement apparatus from a releasing state to an engagement state, Comprising: The figure which showed the case where a cam type engagement mechanism is an engagement state. FIG. 7 is a diagram showing the releasing operation of the engaging device until the cam type engaging mechanism is changed from the engaged state to the released state, in the case of a transient state until the cam timing engaging mechanism is changed from the engaged state to the released state. FIG. The figure which showed the releasing operation | movement of the engaging apparatus until a cam type engaging mechanism changes from an engagement state to a releasing state, Comprising: The figure which showed the case where a cam type engaging mechanism is a releasing state. The figure which showed schematically the whole structure of the engaging apparatus which concerns on a 2nd form. Explanatory drawing which showed typically the state which looked at the meshing type engagement mechanism from the arrow IX direction of FIG. The figure which showed the case where the meshing engagement mechanism which concerns on a 2nd form is a releasing state.

(First form)
FIG. 1 schematically shows a main part of a drive device to which an engagement device according to a first embodiment of the present invention is applied. The drive device 1 is configured as a drive device for a hybrid vehicle, and includes a first transmission shaft 2 to which engine power (not shown) is transmitted, and an axis Ax2 extending in parallel to the axis Ax1 of the first transmission shaft 2. The second transmission shaft 3 is provided. The second transmission shaft 3 is formed in a hollow shape, and the output shaft 4 is inserted into the hollow portion and is arranged coaxially with the second transmission shaft 3. The power of a motor / generator (not shown) is transmitted to the second transmission shaft 3. The output shaft 4 is provided to transmit power to drive wheels (not shown). An engagement device 5 is provided between the first transmission shaft 2 and the second transmission shaft 3. The engagement device 5 includes a cam-type engagement mechanism 6 provided coaxially with the first transmission shaft 2, and a meshing engagement mechanism 7 provided coaxially with each of the second transmission shaft 3 and the output shaft 4. ing. The engagement device 5 further includes a single actuator 8 that drives the cam type engagement mechanism 6 and the meshing type engagement mechanism 7. The actuator 8 is an electromagnetic actuator provided with an electromagnetic coil (not shown). The actuator 8 can be switched between driving and non-driving by switching between energization and stopping of the electromagnetic coil.

  The cam-type engagement mechanism 6 has a pair of cam members 10 and 11 combined so as to be relatively rotatable around a common axis Ax1. A cam ball 12 as an interposed member is interposed between the movable cam member 10 which is one cam member and the fixed cam member 11 which is the other cam member. Each cam member 10, 11 is formed with V-shaped grooves 13, 14 for holding the cam ball 12 at positions facing each other. Each of the V-shaped grooves 13 and 14 is formed so that the depth in the direction of the axis Ax1 is gradually reduced with respect to the rotation direction of the cam members 10 and 11 (vertical direction in the drawing). The movable cam member 10 is provided so as to be movable in the direction of the axis Ax1, and in the released state of FIG. Yes. The cam type engagement mechanism 6 further includes a friction member 18 attached to a case 17 that is a fixed member so as to face the movable cam member 10. When the movable cam member 10 moves in the direction of the axis Ax1 and contacts the friction member 18 from the released state of FIG. The relative rotation is allowed. The cam ball 12 moves to a shallow position of the V-shaped grooves 13 and 14 by the relative rotation. As a result, a thrust in the direction of the axis Ax1 is generated in the movable cam member 10, and the movable cam member 10 shifts to an engaged state in which it is pressed against the friction member 18.

  The meshing engagement mechanism 7 is interposed between the second transmission shaft 3 and the output shaft 4 in order to intermittently transmit power between the second transmission shaft 3 and the output shaft 4. The meshing engagement mechanism 7 includes a hub 20 provided on the second transmission shaft 3 and a sleeve 21 that is movable in the direction of the axis Ax2 while being rotatable integrally with the output shaft 4. The sleeve 21 is spline-coupled to the outer periphery of a flange 24 that rotates integrally with the output shaft 4, so that the sleeve 21 can rotate integrally with the output shaft 4 and move in the direction of the axis Ax2. The hub 20 and the sleeve 21 correspond to a pair of meshing members. FIG. 2 is an explanatory view schematically showing a state in which the meshing engagement mechanism 7 is viewed from the direction of arrow II in FIG. As shown in FIG. 2, teeth 22 and 23 extending in the direction of the axis Ax2 as a whole are provided on the outer peripheral surface of the hub 20 and the inner peripheral surface of the sleeve 21. A plurality of tooth portions 22 and 23 are formed at equal intervals in the circumferential direction so that they can mesh with each other. When these tooth portions 22 and 23 are engaged with each other, the second transmission shaft 3 and the output shaft 4 are coupled to each other so that power can be transmitted between them. Then, when the sleeve 21 which is one of the meshing members moves in the direction of the axis Ax2, the meshing of the tooth portions 22 and 23 is released, and the sleeve 21 and the hub 20 are shifted to the released state. As shown in FIG. 2, the tooth portions 22 and 23 are provided with tapered portions 22 a and 23 a inclined with respect to the direction of the axis Ax <b> 2 that is the moving direction of the sleeve 21. Therefore, when the tooth portions 22 and 23 are engaged with each other, the movement of the sleeve 21 is restricted by the tapered portions 22a and 23a. As a result, the meshing between the tooth portions 22 and 23 is hardly released, in other words, the meshing between the sleeve 21 and the hub 20 is difficult to be released. Therefore, these taper portions 22a and 23a function as a release suppressing mechanism according to the present invention.

  As shown in FIG. 1, the engaging device 5 simultaneously drives the movable cam member 10 of the cam type engaging mechanism 6 and the sleeve 21 of the meshing type engaging mechanism 7 by the actuator 8. And a fork 25 as a connecting member for connecting the sleeve 21 and the sleeve 21. The driving force of the actuator 8 is transmitted to each of the movable cam member 10 and the sleeve 21 through the fork 25.

  3-7 is explanatory drawing explaining operation | movement of the engaging apparatus 5. FIG. 3 to 5 show the engaging operation of the engaging device from the released state to the engaged state, and FIG. 3 shows the case where the cam type engaging mechanism is in the released state. 4 shows a transitional state until the cam type engagement mechanism reaches the engaged state, and FIG. 5 shows a case where the cam type engagement mechanism is in the engaged state.

In the state of FIG. 3, since the energization to the actuator 8 is stopped, each cam member 10, 11 of the cam type engagement mechanism 6 rotates integrally with the first transmission shaft 2 in the direction of the arrow. On the other hand, the meshing engagement mechanism 7 is in an engaged state in which the sleeve 21 and the hub 20 are meshed with each other. As shown in FIG. 2, the meshing engagement mechanism 7 is held in a state in which the meshing is difficult to be released by the tapered portions 22a and 23a formed in the tooth portions 22 and 23, thereby supplementing the action of the return spring 16. ing. Accordingly, the occurrence of erroneous engagement of the cam type engagement mechanism 6 is held in a suppressed state. In the state of FIG. 4, energization of the actuator 8 is started, and the movable cam member 10 moves in the direction of the axis Ax1 and contacts the friction member 18. Therefore, the space between the cam members 10 and 11 in the direction of the axis Ax1 is widened and relative rotation is allowed, that is, a backlash occurs in the rotation direction. On the other hand, the meshing engagement mechanism 7 is released by the movement of the sleeve 21 by the actuator 8 and the meshing is released. In the state of FIG. 5, the thrust for pressing the movable cam member 10 to the friction member 18 is generated by the relative rotation between the cam members 10 and 11, the movable cam member 10 due to the energization of the actuator 8 and the friction member 18 The frictional force generated between them can be compensated. In addition, the so-called torque capacity can be made variable by adjusting the amount of power supplied to the actuator 8. The rotational speed of the first transmission shaft 2 is reduced depending on the torque capacity. However, it is also possible to make the torque capacity invariable by making the cam type engagement mechanism 6 self-locking.

  6 and 7 show the releasing operation of the engaging device until the cam type engaging mechanism is changed from the engaged state to the released state. FIG. 6 shows the cam type engaging mechanism from the engaged state to the released state. FIG. 7 shows the case where the cam-type engagement mechanism is in the released state. In the state of FIG. 6, the stop of energization to the actuator 8 is started, the torque capacity is reduced, and the rotational speed of the first transmission shaft 2 is increased depending on the torque capacity. On the other hand, the meshing engagement mechanism 7 is maintained in a released state. In the state of FIG. 7, the energization of the actuator 8 is stopped, so that the movable cam member 10 is separated from the friction member 18 by the elastic force of the return spring 16 and shifts to the released state. At the same time, the meshing engagement mechanism 7 moves so that the sleeve 21 approaches the hub 20, and the sleeve 21 and the hub 20 mesh with each other and shift to the engaged state.

  As described above, the engagement device 5 can operate the cam type engagement mechanism 6 and the meshing type engagement mechanism 7, which are two engagement mechanisms, by the single actuator 8. Since the meshing engagement mechanism 7 is in the engaged state and the meshing is difficult to be released when the cam type engagement mechanism 6 is in the released state, erroneous engagement of the cam type engagement mechanism 6 occurs. It is suppressed.

(Second form)
Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 8 schematically shows the overall configuration of the engagement device according to the second embodiment. The engaging device 30 is applied to the driving device 1 as in the first embodiment. The engagement device 30 includes a cam type engagement mechanism 31, a meshing type engagement mechanism 32, and an electromagnetic actuator 33 for driving these engagement mechanisms 31, 32. The basic configuration of the cam type engagement mechanism 31 is the same as that of the cam type engagement mechanism 6 according to the first embodiment, but the arrangement of each member is slightly different. In the cam type engagement mechanism 31, the return spring 34 is arranged on the inner peripheral side of the movable cam member 35, that is, on the side close to the axis Ax1, and the actuator 33 is on the outer peripheral side of the movable cam member 35, that is, on the side far from the axis Ax1. Is arranged. A cam ball 37 is interposed between the movable cam member 35 and the fixed cam member 36 which are a pair of cam members, and V-shaped grooves 39 and 40 for holding the cam ball 37 are formed in the cam members 35 and 36, respectively. ing. The outer diameter of the fixed cam member 36 is smaller than the outer diameter of the movable cam member 35. The friction member 38 to be engaged also serves as the housing of the actuator 33 and is fixed to the case 17 so as to face the movable cam member 35.

  The meshing engagement mechanism 32 includes a first meshing member 41 that can move in the direction of the axis Ax2 and can rotate integrally with the output shaft 4, and a second meshing member 42 that can rotate integrally with the second transmission shaft 3. ing. FIG. 9 is an explanatory view schematically showing a state in which the meshing engagement mechanism 32 is viewed from the direction of the arrow IX in FIG. As apparent from FIGS. 8 and 9, teeth 43 and 44 are formed on the outer peripheral surface of the first meshing member 41 and the inner peripheral surface of the second meshing member 42, respectively. These tooth portions 43 and 44 have tapered portions 43a and 44a as in the first embodiment. In the second form, it is possible to change the form without the taper part, that is, the form in which the tooth parts 43 and 44 are parallel to the axis Ax2 without tilting the side surfaces.

  As shown in FIG. 9, the meshing engagement mechanism 32 is provided with a lock mechanism 45 in order to make it difficult for the meshing between the first meshing member 41 and the second meshing member 42 to be released in the engaged state. ing. The lock mechanism 45 includes a recess 46 formed in the first meshing member 41, and a lock ball 48 as a lock member that is attached to the flange 24 (see FIG. 1) via a spring 47 and can be fitted into the recess 46. Have. FIG. 10 is a view showing a case where the meshing engagement mechanism 32 is in a released state. As apparent from FIGS. 9 and 10, the movement of the first meshing member 41 is restricted by the lock mechanism 45 only in the engaged state. This is because restricting the movement of the first meshing member 41 in the released state in addition to the engaged state may adversely affect the operation of the cam type engaging mechanism 31, such as torque capacity control.

  Each state of the cam type engagement mechanism 31 and the meshing type engagement mechanism 32 that are switched to the actuator 33 by an operation is the same as that in the first embodiment. In other words, the engagement device 30 is configured so that the meshing engagement mechanism 32 is engaged when the cam type engagement mechanism 31 is in the released state, and the meshing engagement is performed when the meshing engagement mechanism 31 is in the engagement state. The state is switched so that the combined mechanism 32 is in the released state. When the meshing engagement mechanism 32 is in the engaged state, the movement of the first meshing member 41 is restricted by the lock mechanism 45 and, at the same time, the cam-type engagement mechanism 31 is held in the released state. The occurrence of erroneous engagement of the combined mechanism 31 can be suppressed. Therefore, the lock mechanism 45 functions as a release restraining mechanism according to the present invention.

  The present invention is not limited to the above embodiments, and can be implemented in various forms within the scope of the gist of the present invention. The application target of the engagement device of the present invention is not limited to a drive device for a hybrid vehicle, and the engagement device of the present invention can be applied to a device having two or more points for switching a power transmission path.

5, 30 engaging device 6, 31 cam type engaging mechanism 7, 32 meshing type engaging mechanism 10, 35 movable cam member (cam member)
11, 36 Fixed cam member (cam member)
18, 38 Friction member (engagement target)
20 Hub (meshing member)
21 Sleeve (meshing member)
22, 23 Teeth 22a, 23a Taper 41 First meshing member 42 Second meshing member 43, 44 Teeth 43a, 44a Taper 45 Lock mechanism 46 Recess 48 Lock ball (lock member)
Ax1, Ax2 axis

Claims (3)

A pair of cam members that are combined so as to be relatively rotatable around a common axis and that are integrally rotatable with a transmission shaft that transmits power, and the pair of cam members are released from the object to be engaged. A state in which one cam member of the pair of cam members is pressed against the engagement target by the axial force generated by the relative rotation of the pair of cam members. A cam-type engagement mechanism that can be switched by moving a member in the direction of the axis;
One of the pair of meshing members is moved between an engaged state in which the pair of meshing members mesh with each other and a released state in which the pair of meshing members are separated from each other. A meshing engagement mechanism that can be switched by
A connecting member that connects the one cam member of the cam-type engagement mechanism and the one engagement member of the mesh-type engagement mechanism;
When the cam type engagement mechanism is in the released state, the meshing type engagement mechanism is in the engaged state, and when the cam type engagement mechanism is in the engaged state, the meshing type engagement mechanism is released. A single actuator that can simultaneously operate the one cam member and the one meshing member connected by the connecting member so as to be in a state;
A release suppression mechanism that restricts movement of the pair of meshing members so that the meshing of the pair of meshing members is difficult to be released when the meshing engagement mechanism is in the engaged state;
An engagement device comprising: The pair of meshing members have teeth that mesh with each other;
The engagement device according to claim 1, wherein the release suppression mechanism is configured by the tooth portion having a tapered portion inclined with respect to a moving direction of the pair of meshing members.   The release restraining mechanism has a recess formed in the one engagement member and a lock member that can be fitted in the recess, and the engagement type engagement mechanism is in the recess when the engagement state is in the engaged state. The engagement device according to claim 1, wherein a lock mechanism that restricts movement of the one meshing member by fitting the lock member is provided.

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