阅读说明：本技术 用于机动车的驻车锁止器的锁定装置 (Locking device for a parking brake of a motor vehicle ) 是由 托比亚斯·基希格斯纳 马赛厄斯·费尔巴哈 威廉·伯姆 于 2020-02-04 设计创作，主要内容包括：本发明涉及一种用于机动车的驻车锁止器的锁定装置,其包括：配设用于锁定驻车锁止器的至少一个运行状态的切换元件,该切换元件具有至少一个锁止凹部；锁止体,该锁止体设置在锁定装置的壳体中的为此设有的孔中；和具有释放凹部的锁止栓,其中锁止体在孔中可在锁止位置和释放位置之间移动,其中锁止体在释放位置中部分地容纳在锁止栓上的释放凹部中,并且其中锁止体在锁止位置中部分地容纳在切换元件上的至少一个锁止凹部中,其中此外弹簧至少间接地贴靠在锁止栓上并且借助于弹簧力加载锁止栓,其中锁止栓可抵抗弹簧力液压地操纵,以便使锁止体在壳体中移动。(The invention relates to a locking device for a parking brake of a motor vehicle, comprising: a switching element for locking at least one operating state of the parking brake is provided, which switching element has at least one brake recess; a locking body which is arranged in a bore provided for this purpose in the housing of the locking device; and a locking bolt with a release recess, wherein the locking body is movable in the bore between a locking position and a release position, wherein the locking body is partially accommodated in the release recess on the locking bolt in the release position, and wherein the locking body is partially accommodated in at least one locking recess on the switching element in the locking position, wherein furthermore a spring at least indirectly bears against the locking bolt and loads the locking bolt by means of a spring force, wherein the locking bolt is hydraulically actuatable against the spring force in order to move the locking body in the housing.)

1. A locking device (1) for a parking lock of a motor vehicle, comprising: a switching element (2) for locking at least one operating state of the parking brake is provided, said switching element having at least one locking recess (3a, 3 b); a locking body (4) which is arranged in a bore (5) provided for this purpose in a housing (6) of the locking device (1); and a locking bolt (7) having a release recess (8), wherein the locking body (4) is movable in the bore (5) between a locking position and a release position, wherein the locking body (4) is accommodated in part in the release recess (8) on the locking bolt (7) in the release position, and wherein the locking body (4) is accommodated in part in the at least one locking recess (3a, 3b) on the switching element (2) in the locking position, wherein furthermore a spring (9) at least indirectly bears against the locking bolt (7) and loads the locking bolt (7) by means of a spring force, wherein the locking bolt (7) can be hydraulically actuated against the spring force in order to move the locking body (4) in the housing (6).

2. The locking device (1) according to claim 1,

characterized in that the switching element (2) is designed as a shaft and is guided in the housing (6) so as to be movable in the longitudinal direction.

3. Locking device (1) according to one of the preceding claims,

characterized in that the locking bolt (7) is arranged parallel to the switching element (2).

4. Locking device (1) according to one of the preceding claims,

characterized in that the at least one detent recess (3a, 3b) on the switching element (2) and the release recess (8) on the detent pin (7) have at least one ramp (10a, 10b, 11a, 11 b).

5. Locking device (1) according to one of the preceding claims,

the locking device is characterized in that the release recess (8) is designed as a circumferential groove on the locking bolt (7).

6. Locking device (1) according to one of the preceding claims,

characterized in that the at least one detent recess (3a, 3b) is designed as a circumferential groove on the switching element (2).

7. Locking device (1) according to one of the preceding claims,

characterized in that the spring (9) is designed as a compression spring.

8. Locking device (1) according to one of the preceding claims,

characterized in that the locking body (4) is designed as a ball and rolls in the bore (5) in the housing (6) between the release recess (8) and the at least one locking recess (3a, 3b) when the locking bolt (7) is actuated.

9. Locking device (1) according to one of the preceding claims,

characterized in that a disk (12) is arranged between the locking bolt (7) and the spring (9), wherein the disk (12) is arranged coaxially with the switching element (2).

10. Locking device (1) according to one of the preceding claims,

characterized in that the spring (9) pretensions the locking bolt (7) into the release position, wherein the locking bolt (7) can be moved into the locking position against the force of the spring by feeding hydraulic fluid into a chamber (13) formed in the housing (6).

Technical Field

The invention relates to a locking device for a parking brake of a motor vehicle. The parking brake is designed to engage with a pawl into a gear tooth of a parking brake gear of a motor vehicle transmission when actuated by a driver of the motor vehicle, in order to prevent a driven shaft of the transmission, which is operatively connected to the parking brake gear, from rotating and thus to prevent the motor vehicle from slipping out, by this engagement of the pawl. The locking device is designed to lock an operating state of the parking lock, for example, to lock the parking lock in an engaged (parking position) or not in an engaged (driving position).

Background

A locking mechanism for a parking lock is known, for example, from DE 102012215418 a 1. The locking mechanism comprises a support member, a switching member which can be moved into and out of at least one locking position relative to the support member and which can be locked in the locking position, and a locking device having at least one locking body and at least one control body which is formed separately from the locking body. The detent means can be moved into and out of a locking position relative to the support member at least when the switching member is in the locking position, wherein the detent means locks the switching member in the locking position and the movement of the switching member out of the locking position is released by the movement of the detent means out of the locking position. Furthermore, an actuating element, which is formed separately from the blocking device, can be moved into and out of an active position relative to the support member at least when the switching member is in the locking position, wherein the blocking device is moved into the locking position by the actuating element being moved into the active position.

Disclosure of Invention

The object of the invention is to provide an alternative locking device. This object is achieved by the subject matter of the present invention. Preferred embodiments can be taken from the following.

The locking device for a parking lock of a motor vehicle according to the present invention includes: a switching element for locking at least one operating state of the parking brake is provided, which switching element has at least one brake recess; a locking body which is arranged in a bore provided for this purpose in the housing of the locking device; and a locking bolt with a release recess, wherein the locking body is movable in the bore between a locking position and a release position, wherein the locking body is partially accommodated in the release recess on the locking bolt in the release position, and wherein the locking body is partially accommodated in at least one locking recess on the switching element in the locking position, wherein furthermore a spring at least indirectly bears against the locking bolt and loads the locking bolt by means of a spring force, wherein the locking bolt is hydraulically actuatable against the spring force in order to move the locking body in the housing.

In other words, by hydraulically actuating the locking bolt, a hydraulic pressure builds up on the locking bolt, wherein the locking bolt is moved in the housing and the locking body is switched over between the release position and the locking position as a result. The locking body is moved from a release recess on the locking bolt through a hole in the housing into at least one locking recess on the switching element. For this purpose, the switching element is in a lockable position, i.e. the at least one locking recess on the switching element is positioned at the level of the hole in the housing, and thus partial accommodation of the locking body can be achieved. The return of the locking bolt into the release position is achieved by eliminating the hydraulic pressure on the locking bolt and the spring force on the locking bolt. As soon as the locking bolt has been returned to the release position by means of the spring force, the locking of the switching element is undone, so that a movement of the switching element causes the locking body to move from the at least one locking recess on the switching element through the hole in the housing into the release recess on the locking bolt. The release recess on the locking bolt is positioned at the level of the hole in the housing and thus enables partial accommodation of the locking body.

Preferably, the spring pretensions the locking bolt into the release position, wherein the locking bolt can be moved into the locking position against the force of the spring by feeding hydraulic fluid into a chamber formed in the housing.

In particular, the switching element is designed as a shaft and is guided in the housing so as to be movable in the longitudinal direction. The locking body can thus be displaced in the bore of the housing transversely to the longitudinal direction of the switching element. Preferably, the locking bolt is arranged parallel to the switching element. Alternatively, the locking bolt can also be perpendicular to the switching element or have another arrangement.

The present invention comprises the following technical teaching: the locking body is designed as a ball and rolls in a bore in the housing between the release recess and the at least one locking recess when the locking bolt is actuated. The diameter of the bore corresponds at least to the diameter of the locking body. The bore length is likewise smaller than the diameter of the blocking body, as are the at least one blocking recess on the switching element and the release recess on the blocking bolt, so that the blocking body is always held in the bore and projects either partially into the at least one blocking recess on the switching element or partially into the release recess on the blocking bolt and thereby blocks or releases the switching element.

Preferably, the at least one detent recess on the switching element and the release recess on the detent pin have at least one ramp. In particular, at least one latching recess on the switching element and a release recess on the latching bolt have a first and a second ramp, respectively. Via the respective ramp, the locking body can be moved into and out of the locking recess or the release recess when the switching element or the locking bolt is moved, wherein the locking body is always guided in the bore of the housing during this movement.

Further preferably, the switching element includes: a first locking recess in which the locking body is partially received in a parking position of the parking lock; and a second recess axially offset from the first recess, in which the locking body is accommodated in the driving position of the parking lock.

The release recess is preferably designed as a circumferential groove on the detent pin. In particular, the at least one detent recess is designed as a circumferential groove on the switching element. Preferably, the spring is designed as a compression spring. Furthermore, the spring is preferably a helical spring which is arranged coaxially with the switching element and extends helically around the switching element.

Advantageously, a disk is arranged between the locking bolt and the spring, wherein the disk is arranged coaxially with the switching element. The disk is provided to axially accommodate the spring and to transmit the spring force to the locking bolt.

In particular, the use of the locking device according to the invention in combination with a parking brake of a motor vehicle transmission is proposed. The locking device is preferably integrated in a motor vehicle transmission.

Drawings

The measures which further improve the invention are explained in detail below together with the description of preferred embodiments of the invention on the basis of the drawing. Shown here are:

fig. 1 shows a schematic cross-sectional view for illustrating a locking device according to the invention in a release position;

fig. 2 shows a schematic sectional illustration of the locking device according to fig. 1 in a locking position; and

fig. 3 shows a schematic perspective view of the locking device according to fig. 1 and 2.

Detailed Description

Fig. 1, 2 and 3 show a locking device 1 according to the invention for a parking lock, not shown here, of a motor vehicle. Fig. 1 shows the locking device 1 in the release position, wherein fig. 2 shows the locking position of the locking device 1. According to fig. 3, the state of the locking device 1 is not visible due to the illustration of the housing 6 of the locking device 1. It should be noted that not all reference numerals have been labeled in all figures for perspective or cut-away reasons.

According to fig. 1, 2 and 3, the locking device 1 according to the invention comprises: a switching element 2 having first and second locking recesses 3a, 3 b; a locking body 4, which is arranged in a bore 5 provided for this purpose of a housing 6 of the locking device 1; and a locking pin 7 having a release recess 8. The shift element 2 is designed as a shaft and is guided in the housing 6 so as to be movable in the longitudinal direction in the release position. The locking bolt 7 is arranged parallel to the switching element 2 and is guided in the housing 6 so as to be movable in the longitudinal direction in the locking position. The release recess 8 is likewise designed as a circumferential groove, as are the two latching recesses 3a, 3 b.

For this purpose, the locking device 1 is associated with two operating states for locking the parking brake. When the locking body 4 is partially received in the first locking recess 3a, the parking position of the parking lock is locked, wherein the locking body 4 is partially received in the second locking recess 3b, locking the driving position of the parking lock.

The locking body 4 is movable in the bore 5 between a locking position and a release position, wherein the locking body 4 is partially received in a release recess 8 on the locking bolt 7 in the release position. In contrast, the blocking body 4 is partially accommodated in one of the two blocking recesses 3a, 3b on the switching element 2 in the blocking position. The locking bodies 4 are designed as balls and roll in the bores 5 in the housing 6 between the release recesses and the respective locking recesses 3a, 3b when the locking bolt 7 is actuated. The two latching recesses 3a, 3b on the switching element 2 and the release recess 8 on the latching bolt 7 each have two ramps 10a, 10b, 11a, 11 b. The inclined surfaces 10a, 10b, 11a, 11b enable the locking body 4 to roll easily into the respective locking recess 3a, 3b or release recess 8.

The spring 9 bears indirectly via a disk 12 against the locking bolt 7. In the present case, a disk 12 is arranged between the locking bolt 7 and the spring 9, wherein the disk 12 is arranged coaxially with the shift element 2. The spring 9 acts on the locking bolt 7 with its spring force via the disk 12, wherein the locking bolt 7 can be hydraulically actuated against the spring force of the spring 9 in order to move the locking body 4 in the housing 6.

According to fig. 1, the locking body 4 is partially received in a release recess 8 on the locking bolt 7 and partially in the bore 5 on the housing 6. This position is defined as the release position of the locking device 1, since the switching element 2 is axially movable in this position, and the movement of the switching element 2 is released. In the release position, the blocking body 4 is fixed in the bore 5 radially between the circumferential surface of the switching element 2 and the release recess 8 on the blocking pin 7 and parallel to the longitudinal direction of the switching element 2. The spring 9 is prestressed and presses or holds the locking bolt 7 in this release position. The radial distance between the circumferential surface of the locking bolt 7 and the circumferential surface of the shift element 2 is smaller than the diameter of the locking body 4. The diameter of the bore 5 substantially corresponds to the diameter of the locking body 4 and enables the locking body 4 to roll in the bore 5 with low friction between the locking position and the release position.

In fig. 2, the locking body 4 is partially accommodated in the second locking recess 3b on the locking bolt 7 and partially in the bore 5 on the housing 6. This position is defined as the locking position of the locking device 1, since the switching element 2 is not axially movable in this position, and the movement of the switching element 2 is locked. In the locking position, the locking body 4 is fixed in the bore 5 radially between the circumferential surface of the locking bolt 7 and the second locking recess 3b on the switching element 2 and parallel to the longitudinal direction of the switching element 2. The spring 9 is prestressed and presses or holds the locking bolt 7 in this release position. The two detent recesses 3a, 3b on the switching element 2 are of identical design and are offset from one another in the longitudinal direction of the switching element 2. The description of the locking position of the locking body 4 in the second locking recess 3b therefore applies to the description of the locking position of the locking body 4 in the first locking recess 3a, which is not shown in the present case.

The change from the release position into the locking position is effected by an axial displacement of the switching element 2 into the parking position or the driving position and by a feed of hydraulic fluid into a chamber 13 formed in the housing 6, wherein the locking bolt 7 is thereby displaced into the locking position via the hydraulic fluid against the spring force. At the same time, the locking body 4 is thereby moved into one of the two locking recesses 3a, 3b on the switching element 2 and thus locks the parking position or the driving position. In order to return the locking bolt 7 from the locking position into the release position, hydraulic fluid is discharged from the chamber 13, wherein the locking bolt 7 is thereby returned into the release position as a result of the spring force. Thereafter, the switching element 2 is moved axially and the blocking body 4 is thereby moved into the release recess 8 on the switching element 2.

According to fig. 3, the locking device 1 does not show the switching element 2 for the sake of simplicity. A mounting opening 14 for the passage of the locking body 4 into the bore 5 for the feed of hydraulic fluid into the channel opening 15 in the chamber 13 is formed in the housing 6 of the locking device 1. The housing 6 is in the present case cylindrical and has a central bore 16 for receiving and guiding the switching element 2.

List of reference numerals

1 locking device

2 switching element

3a, 3b locking recess

4 locking body

5 holes

6 casing

7 locking bolt

8 Release recess

9 spring

10a, 10b inclined surfaces on the locking recesses

11a, 11b release ramps on the recesses

12 disks

13 chamber

14 mounting port

15 channel port

16 center hole