Actuating device for a clutch/brake and clutch/brake
阅读说明:本技术 用于离合/制动器的致动装置以及离合/制动器 (Actuating device for a clutch/brake and clutch/brake ) 是由 F·尼克尔 D·皮林格尔 A·吉恩西斯 W·文德尔 于 2020-03-25 设计创作,主要内容包括:本发明涉及一种致动装置,所述致动装置具有至少一个致动活塞(9),所述致动活塞相对于一个轴(6)能沿轴向移动并在致动状态下向离合/制动部件(3、4)上施加沿轴向作用的压紧力。为了在组装总系统时简化操作并降低成本,所述致动活塞(9)能通过至少一个切换活塞(1)沿轴向移动到致动位置中。在致动活塞(9)和切换活塞(1)之间的接触区域中在所述致动活塞(9)上和/或所述切换活塞(1)上设有涂层(15)。所述致动活塞(9)也可以通过切换活塞(1)形成,所述切换活塞直接与所述离合/制动部件(3、4)配合作用。在所述离合/制动部件(3、4)与切换活塞(1)之间的接触区域中设有至少一个涂层(15)。(The invention relates to an actuating device comprising at least one actuating piston (9) which can be moved axially relative to a shaft (6) and which, in the actuated state, exerts an axially acting pressing force on a clutch/brake component (3, 4). In order to simplify handling and reduce costs when assembling the overall system, the actuating piston (9) can be moved axially into an actuating position by means of at least one switching piston (1). A coating (15) is provided on the actuating piston (9) and/or on the switching piston (1) in the contact region between the actuating piston (9) and the switching piston (1). The actuating piston (9) can also be formed by a switching piston (1) which interacts directly with the coupling/braking component (3, 4). At least one coating (15) is provided in the contact region between the clutch/brake component (3, 4) and the switching piston (1).)
1. Actuating device for a clutch/brake, having at least one actuating piston which is movable in an axial direction relative to a shaft and which, in the actuated state, exerts a pressing force acting in the axial direction on a clutch/brake component, characterized in that the actuating piston (9) can be moved in the axial direction into an actuating position by means of at least one switching piston (1), and in that a coating (15) is provided on the actuating piston (9) and/or on the switching piston (1) in the contact region between the actuating piston (9) and the switching piston (1).
2. Actuation device according to claim 1, characterized in that the coating (15) is provided along the outer circumference of the actuation piston (9).
3. Actuating device according to claim 1 or 2, characterized in that the coating (15) is configured in the shape of a circular ring and extends over the entire circumference of the actuating piston (9) or switching piston (1).
4. Actuator device according to one of claims 1 to 3, wherein the coating (15) is a sliding coating.
5. Actuating device according to one of claims 1 to 4, characterized in that the switching piston (1) has at least one fine bore (16) through which lubricant enters into the contact region between the actuating piston (9) and the switching piston (1).
6. Actuator device according to claim 5, wherein the fine hole (16) connects the contact area with a pressure chamber (12) defined by the switching piston (1).
7. Actuating device according to one of claims 1 to 6, characterized in that the actuating piston (9) is surrounded with radial play in the actuating position by at least one blocking wall (17).
8. Actuator device according to one of claims 1 to 7, wherein the arresting wall (17) is provided on the switching piston (1).
9. Actuating device according to one of claims 1 to 8, characterized in that the actuating piston (9) and/or the switching piston (1) is provided on the end side with a structure for uniform distribution of the lubricant.
10. Actuator device according to one of claims 1 to 9, wherein the switching piston (1) is fixed against rotation about its axis.
11. Actuating device for a clutch/brake, having at least one actuating piston which can be moved in the axial direction relative to a shaft and which, in the actuated state, exerts a pressing force acting in the axial direction on a clutch/brake component, characterized in that the actuating piston is a switching piston (1) which directly interacts with the clutch/brake component (3, 4), and in that at least one coating (15, 19) is provided in the contact region between the clutch/brake component (3, 4) and the switching piston (1).
12. Actuator device according to claim 11, wherein the coating (15, 19) is a sliding coating.
13. Actuator device according to claim 11, wherein the coating (15, 19) is a friction lining.
14. Actuator device according to one of claims 11 to 13, wherein the switching piston (1) is connected to the shaft (6) in a rotationally fixed manner.
15. Clutch/brake with at least one actuating device according to one of claims 1 to 14.
Technical Field
The present invention relates to an actuating device according to the preamble of
Background
To operate a multiplate clutch, hydraulically operated actuating devices are known. The actuating device is located next to the plate set of the multiplate clutch and rotates with the plate set in the actuated state.
Vertical actuating pistons are also known, which act on the plate packs of a multiplate clutch in a rotationally coupled manner via an axial rolling bearing. This solution is particularly intended for systems with slow rotation, such as differential locks or all-wheel drive clutches.
In addition, conventional shift pistons are also known in clutches that are conventional in the automotive field.
Such clutches/brakes comprise a plurality of individual components which have to be coordinated with one another in the overall system and which come into contact with one another during actuation. The assembly of the plurality of components makes the operation work unnecessarily complicated and costly.
Disclosure of Invention
The aim of the invention is to configure the actuating device and the clutch/brake in such a way that the handling is simplified and the costs are reduced when the overall system is assembled.
This object is achieved according to the invention in an actuating device of the generic type by the features of the characterizing part of
The actuating device according to the invention has an actuating piston which is moved axially into an actuating position by at least one switching piston. The switching piston can thus be arranged in a region outside the clutch/brake component. The switching piston moves axially from an initial position and urges the actuation piston towards an actuated position. The actuating piston rotates together with the clutch/brake component about its axis, while the shift piston can only move in the axial direction. Thereby, a sliding coupling is formed in the contact area between the actuation piston and the switching piston. In this region, a coating is provided, which is preferably a sliding coating and ensures that wear of the two pistons in this contact region is minimal. The coating may be provided on the actuation piston and/or the switching piston. If the coating is designed as a sliding coating, it ensures that the friction between the two pistons is low, so that a long service life of the actuating piston is ensured and no metallic friction occurs between the two pistons.
The sliding coating can be, for example, a sliding lacquer or else a DLC coating. Other materials with good sliding effect can also be used.
Since the coating is provided on the actuating piston and/or on the switching piston, no additional components are required.
The coating is advantageously provided along the outer circumference of the actuation piston and/or the switching piston.
Advantageously, the coating is annular and extends over the entire circumference of the actuating piston or the switching piston.
If no torque is transmitted, the coating is preferably a slip coating.
A particularly advantageous embodiment is obtained if the switching piston is provided with at least one fine bore through which lubricant enters the contact region between the two pistons. The durability of the sliding coating is thereby significantly increased. The lubricant flowing through the fine bores or through the valve through the switching piston serves as a lubricating medium for the sliding coating on the sides opposite one another.
The pressure medium with which the switching piston is operated is advantageously used as a lubricant. Thus, the fine hole in the switching piston communicates the contact area with a pressure chamber defined by the switching piston.
It is furthermore advantageous if the actuating piston is surrounded by at least one blocking wall with radial play in the actuating position. The lubricant can be held in the region of the sliding contact for as long as possible by the blocking wall. This significantly reduces the outflow of lubricant out of the sliding gap.
The blocking wall is advantageously arranged on the switching piston, advantageously formed integrally therewith.
A further improvement in the durability of the sliding coating can be achieved in that the actuating piston and/or the switching piston are provided on the end face with a structure for uniform distribution of the lubricant. This structure ensures that the lubricant is distributed uniformly on the sliding surface of the sliding coating.
In order that the switching piston is not put into rotation when relative movement occurs between the switching piston and the actuating piston, the switching piston is rotationally fixed about its axis. Such a rotationally fixed connection can be provided, for example, by a corresponding design of the return spring for the switching piston. For example, pins or sliding blocks can also be arranged distributed over the circumference of the switching piston, said pins or sliding blocks being embedded in the inner wall of the housing which surrounds the switching piston.
An actuating device according to claim 11, characterised in that the actuating piston is a switching piston which acts directly in conjunction with the clutch/brake component and is provided with at least one coating in the contact region between the clutch/brake component and the switching piston. The switching piston serves in this case not only as a carrier for the coating, but at the same time also as an actuating element in order to apply an axial pressure to the clutch/brake component.
The coating can be a sliding coating if the clutch/brake component rotates relative to the switching piston during the actuation process.
If no relative rotation takes place between the coupling/braking component and the switching piston, the coating is advantageously formed by friction linings with which the switching piston is pressed against the corresponding mating friction surface in the case of operation.
Such friction linings can be arranged on the switching piston in different ways. For example, the friction lining can be sintered onto the switching piston, can be applied to the switching piston in the form of a coating by PVD, or can be bonded to the switching piston.
The clutch/brake according to the invention is equipped with at least one actuating device according to the invention.
The subject matter of the present application derives not only from the subject matter of the individual claims, but also from all the information and features disclosed in the figures and the description. Although this information and features is not the subject of the claims, it is also claimed as essential to the invention if this information and features alone or in combination with one another are new with respect to the prior art.
Further features of the invention emerge from the further claims, the description and the drawings.
Drawings
The invention will be described in detail with reference to an embodiment shown in the drawings. Wherein:
fig. 1 shows a multi-plate clutch with an actuating device according to the invention, the actuating piston of which is in the actuating position, in a schematic view;
FIG. 2 shows the multiplate clutch with a representation corresponding to FIG. 1, here with the actuating piston in an unactuated position;
fig. 3 shows an end side view of a switching piston of the actuating piston according to fig. 1 and 2;
fig. 4 shows an axial half-section of the second embodiment of the actuating device in the actuating position.
Detailed Description
Fig. 1 and 2 show schematically an example of a high-speed clutch, in which a
Fig. 2 shows the multiplate clutch in an open state, in which the
In order to press the
A
The actuating piston 9 can rotate together with the
In the exemplary embodiment shown, the
The actuating piston 9 has a wide annular piston surface 13 on its end opposite the piston surface 10, which can interact with an annular piston surface 14 of the
Since the actuating piston 9 rotates together with the
In the embodiment shown, the sliding coating 15 is provided on the piston face 13 of the actuating piston 9. The sliding coating 15 advantageously covers the piston face 13 completely.
The sliding coating 15 can also be provided on the piston face 14 of the
The sliding coating 15 ensures that less wear occurs on the contact surfaces of the two
When the sliding coating 15 is worn out correspondingly, the sliding coating can be repaired simply.
In order to improve the durability of the sliding coating 15, the
The pressure medium forms a lubricating film for the sliding coating 15 on the piston face 14.
Advantageously, a relief structure is provided in the piston face 14 of the
Fig. 3 shows an example of the relief structure 26. The relief structure can be formed, for example, by recesses inclined with respect to the circumferential direction, which recesses are arranged one behind the other at a distance in the circumferential direction. The recesses may be arranged individually, in pairs or also in groups.
If the
In order to substantially keep the medium in the region of the sliding contact with the sliding coating 15 during operation of the switching piston 1 (fig. 1), a blocking ring 17 is advantageously provided, which can be located in the region between the
If the
If the
In order not to put the
The
The
In conventional multiplate clutches with a rotational speed known, for example, in internal combustion engines, the
The
The
The movement of the
The
In the exemplary embodiment according to fig. 4, the
The radial width of the
The
The embodiments described above can be used in particular for clutches for use in conjunction with electric vehicles in the high-speed range. In the high speed range, the rotational speed may be in the range of about 10000 revolutions per minute to about 50000 revolutions per minute. However, the embodiment described can also be used in conventional clutches.
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