JPH0564251B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a manually operable unidirectional rotating device for operating a spring brake cylinder emergency release device and a slack adjuster return device of a vehicle brake system. The drive device includes a manual operation member disposed at a location on the vehicle that is easy to operate, a conversion mechanism disposed on the device to be operated that converts operation motion into rotational motion, and the manual operation member as a conversion mechanism. and a coupling means for coupling.

PRIOR ART AND DISADVANTAGES For mechanical emergency release devices of spring brake cylinders in vehicle braking systems, it is various to provide a driven part which is driven by hand or possibly via an inserted tool. Types are known in which, during rotation of the driven part, the spring brake cylinder is brought into the braking position either abruptly by disengaging the clutch or gradually by partially engaging the clutch, without pressure medium loading on the spring brake cylinder. It is designed so that it can be moved from the position to the release position. Typical spring brake cylinders of this type are described in particular in German Patent Application No. 2450652, but also in German Patent Application No. 1555116, German Patent Application No. 2254090, U.S. Pat.
3704653 and European Patent No. 0016566.

Rotary drives for the return device are likewise known for slack adjusters of vehicle brake systems, which are arranged as a separate component on the brake rod or are integrated in the brake cylinder. This return device serves to return the slack adjuster when replacing worn brake linings or brake pads with new ones. Typical such return devices are described, for example, in German Patent No. 851,821;
It is publicly known based on Specification No. 1153411, Specification No. 2256431, and National Utility Model No. 1942566. German Patent No. 924 274 furthermore provides that the rotary drive for such a return device can be actuated via a rod by means of a manual actuator located at an easily accessible location on the vehicle. Disclosed. However, with this known rotary drive, only a small angle of rotation can be achieved in one manual operation, so that a number of time-consuming operations are often necessary to obtain the required large angle of rotation.

Problem of the Invention Therefore, the problem of the present invention is to improve the rotary drive device of the type mentioned at the beginning to create a rotary drive device as described below, that is, a rotary drive device that can obtain a considerable rotation angle during one manual operation and that is simple. An object of the present invention is to provide an inexpensive rotary drive device which has a simple structure, can save space, and can be retrofitted to a given spring brake cylinder and slack adjuster in some cases. . In this case, the manually actuated element can be operated by the operator on the vehicle in a particularly simple form and without significant additional production and installation costs, regardless of the mounting situation of the spring brake cylinder or the slip adjuster. It is desirable to be able to place it in any convenient location.

Means for Solving the Problem In order to solve this problem, the configuration of the present invention includes:
The manual operating member is configured to be pulled out substantially linearly from the rest position, and the coupling means connecting the manual operating member with the switching mechanism are configured as a rope device or a Bowden cable for transmitting the pulling movement to the switching mechanism. The converting mechanism has a rotatably supported rope drum, the rope drum serving to wind up the core of a rope or Bowden cable of a rope device connected at one end to the rope drum, and the rope drum also has a winding a clutch which is rotationally loaded in the direction by a hoisting spring and which connects in the direction of unwinding rotation and disconnects in the direction of hoisting rotation, possibly via an overrunning clutch, with the driven part of the device to be operated; It is possible.

Effects of the Invention Although the rotary drive device configured as in the present invention has a relatively simple structure,
A considerable rotation angle can be obtained during manual operation, and it can also be used for emergency release devices and return devices of various structural types, so mass production of the same parts streamlines manufacturing. It is possible to reduce production costs.

Embodiment In an advantageous embodiment of the invention, the clutch prevents the transmission of torque from the driven part to the rope drum in both rotational directions in its disengaged state.
With this design, the rotational movements of the driven parts that may occur during operation (this rotational movement can be produced by the internally acting parts of the spring brake cylinder or the slack adjuster) can be avoided. ) does not lead to any disadvantageous effects in the rotary drive which is in its end position and thus locked in the direction of rotation.

Embodiment As shown in FIGS. 1 and 2, the rotary drive device 1 has a casing 2, 3, 4 consisting of a peripheral wall portion 2, an intermediate lid 3, and a lid 4. It is non-rotatably connected via threaded bolts 5 to a casing 6 of a spring brake cylinder or a slack adjuster (not shown). In other words, a driven part 7 that is driven by the rotary drive 1 is arranged in the casing 6 . According to the already mentioned German Patent Application No. 2450652, if the rotary drive 1 is used in a spring brake cylinder, the casing 6 is the brake cylinder casing and the driven part 7 is the actuating sleeve. Equivalent to.

A recess 8 provided in the interior of the peripheral wall part 2, which on the one hand is limited to the end face 10 of the driven part 7 by a ring-disc-shaped guide part 9 and on the other hand in the middle of the casing 2, 3, 4. A spiral spring 11 is arranged in the recess 8 delimited by the lid 3 and serves as a winding spring. The outer end of this spiral spring 11 is fixed to the peripheral wall part 2 by means of a pin 12, which at the same time serves to hold the guide part 9. Intermediate lid 3
A bearing 13 is provided in the notch that opens toward the lid 4, and this bearing 13 is attached to the rope drum 1.
4 in a rotatable but axially slidable manner. In the section projecting beyond the intermediate lid 3 toward the lid 4, the bearing 13 engages in a centering groove of the lid 4, thereby centering the lid 4. The inner end of the spiral spring 11 is connected to the pin 15
is fixed to the rope drum 14, which engages with a cylindrical appendage 16 in the central recess of the spiral spring 11. The rope drum 14 also has a radially outwardly open annular groove 17 in which a rope 18, which in the illustrated embodiment forms the core of the Bowden cable, is provided.
is wrapped around it. The end of the rope 18 is tightened to the rope drum 14 using a set screw 20.

A sleeve-like clutch part 22 is screwed into the central recess of the rope drum 14 using a thread 21 with a thread pitch so steep that it does not create a self-locking effect.
2 projects beyond the radially inner axial shoulder 23 of the rope drum 14 towards the driven part 7 . A retaining ring 24 embedded in the clutch part 22 near the end facing the driven part 7 is
It allows abutment with an axial shoulder 23 and forms stops 23, 24 in cooperation with the axial shoulder. This stop limits the relative movement of the clutch part 22 with respect to the rope drum 14 in the direction away from the driven part 7. clutch part 2
2 is provided on its inner peripheral surface near its other end with an inner annular groove 25 having a semicircular cross section (see FIG. 4). On the end face adjacent to the driven part 7 the clutch part 22 has one or a plurality of axial projections 26 evenly distributed over the entire circumference, this or these axial projections 26
axial holes 27 suitably positioned during axial movement of the
and thus the axial hole 27
Together, they form clutches 26 and 27 that mesh in the axial direction. A housing extension 29 of the lid 4, which is approximately U-shaped in cross section, penetrates into the chamber 28 surrounded by the clutch part 22. clutch part 2
A leg spring 30 is provided in the space between 2 and the casing addition part 29, and this leg spring 3
0 loosely surrounds the casing extension 29, and both ends 31 of the legged spring 30 surround the leg ends of the casing extension 29 and are bent approximately radially inward, so that the ends 31
loosely surrounds both leg ends of the casing attachment portion 29. The outer periphery of the legged spring 30 is frictionally connected in the inner annular groove 25, as can be seen in FIG. The leg spring 30 is thus held in the casing attachment part 29 in a non-rotatable but axially slidable manner, and in the clutch part 22 in an axially slidable but rotatable manner against frictional resistance. , and therefore the clutch portion 22
is held in the casing attachment portion 29 so as to be slidable in the axial direction and rotatable against frictional resistance.

As shown in FIG.
2, and the lid 4 is screwed to the peripheral wall part 2 using a screw 33 passing through the intermediate lid 3 (see FIG. 2).

The jacket 34 of the Bowden cable 19 is held on the one hand in a hole 35 in the lid 4 extending tangentially to the rope drum 14 , through which the rope 18 extends towards the rope drum 14 . The Bowden cable 19 extends from the rotary drive section, which can be referred to as the conversion mechanism as a whole, to a point in the vehicle that is convenient for the operator to operate. At this point, the other end of the exterior 34 is the head 36
is fixed to a vehicle (not shown). The head 36 ends in a conical opening 37 into which a conical extension 38 can be engaged in a sealed manner via a sealing ring 39 . The rope 18 which is the core of the Bowden cable 19 has a conical appendage 38
, where it is held by tightening using a set screw 40. A manual actuating element 41, which is designed as a grip ring, is connected to the conical extension 38, so that the manual actuating element 4
1 from the head 36 in a substantially straight line, the rope 18 is unwound from the rope drum 14 with corresponding rotation of the rope drum.
The rope drum 14 then rotates in the tensioning direction of the spiral spring 11.

When assembling the rotary drive, the screw 33 is removed and the rope 18 is inserted into the legged spring 11 until the lid 4 guided in the bearing 13 is brought into contact with the opening 37 as follows: The rope is then rotated so as to be wound around the rope drum 14 held by the rope. This rotational movement is then continued some more in order to tension the legged spring 11, and the rope drum 14 is rotated together via the now tensioned rope 18, thereby tensioning the spiral spring 11. Finally, the lid 4 is screwed 3
3 to the rest of the casing 2, 3, 4.

When the manual actuating member 41 is pulled in order to operate the rotary drive 1, the rope drum 14 is moved in the tensioning direction of the spiral spring 11, as already mentioned, by the withdrawal of the rope 18 from the casings 2, 3, 4. It is made to rotate. When the rope drum 14 rotates in this manner, the clutch part 22, which is prevented from pivoting relative to the legged spring 30 by a frictional connection via the thread 21, is threaded towards the left as viewed in FIG. The axial projection 26 then immediately engages in the axial bore 27 or initially rests on the end face 10. In the latter case, further rotation of the rope drum 14 causes the clutch part 22 to pivot with the rope drum 14 until the axial projection 26 coincides with and engages the axial hole 27. This causes the clutches 26, 27 to be closed anyway. Further rotation of the rope drum 14 then causes the clutch part 22 and the closed or connected clutches 26, 27 to be prevented, since further axial movement of the clutch part 22 is prevented by the abutment with the part 7. through the driven part 7
are also rotated together. The relatively low friction of the legged spring 30 on the clutch portion 22 impedes this rotation only very slightly. In other words, this friction is sufficient as long as it can ensure the screw movement of the clutch portion 22 when the rope drum 14 starts rotating.

After the driven part 7 has been rotated, the manual actuator 41 is returned until the conical extension 38 enters the opening 37, and the spiral spring 11 rotates the rope drum 14 in the winding direction of the rope 18.
Due to the anti-rotation effect effective in the clutch part 22 due to the friction in the driven part 7 and the leg spring 30, the clutch part 22 does not follow the rotation in this case, but instead moves towards the starting position shown in FIG. once again, ie until the retaining ring 24 abuts the axial shoulder 23 . During further rotation of the rope drum 14 to wind up the rope 18, the clutch portion 22 is rotated together, overcoming friction against the leg spring 30. If the operations described above are not sufficient for the driven part 7 despite a large angle of rotation, possibly resulting in several rotations, the required angle of rotation of the driven part 7 Alternatively, the above-described operating steps can be repeated until the required rotational speed is obtained.

At the end of the operation, the spiral spring 11 is connected to the rope drum 1
4 and the rope 18 into the opening 38 (rest state). In this state, the seal ring 39 is attached to the Bowden cable 19.
and/or prevent contamination of the rotary drive due to the ingress of foreign matter or moisture into the holes 35.

Variants of the embodiment shown In the embodiment, instead of the Bowden cable 19, it is also possible to use a pure rope arrangement with the rope 18, which is suitably installed in the vehicle. In this embodiment, it is advantageous if the rope 18 is sealed at the point of entry into the lid 4. Furthermore, under suitable installation conditions, it is possible to omit the Bowden cable 19 and hold the head 36 directly in the outer opening of the bore 35.

If the rotary drive 1 only needs to produce relatively small torques, the axial projection 26 and the axial bore 27 can be omitted, in which case the clutch between the clutch part 22 and the driven part 7 is It is a friction clutch formed by the contact between the end face 10 and the end face of the clutch portion 22.

What is important in all the above-mentioned embodiments of the rotary drive 1 is that in the illustrated rest state the driven part 7 is completely isolated from the clutch part 22 and thus from the movable parts of the rotary drive 1. . Even if a rotational movement occurs in the driven part 7 by the active part of the spring brake cylinder or the slack adjuster (such rotational movement can be caused in particular by road vibrations), this rotation Movements are unlikely to displace the rotary drive and, in particular, do not result in excessive tensioning of the rope 18, which would lead to undesirable reactions on the driven part 7. Furthermore, in the opposite direction of rotation of the driven part 7, the rope 18 does not loosen and thus the sealing ring 39 does not become inactive. If it is not necessary to completely disconnect the driven part 7 from the rotary drive 1 in the rest position of the rotary drive 1, in a further variant of the embodiment described above, the rope drum 14 can be Via the running clutch, a direct connection to the driven part 7 and the rigidly connected part is possible. In this case, the thread 21, the clutch part 22, the foot spring 30 and the casing extension 29 can be omitted.

The rotary drive 1 is designed as a structural unit that can be easily attached to spring brake cylinders or slip adjusters of various construction types and can be adapted to such brake systems with only minor modifications for adaptation. Also suitable for mounting from With these versatile possibilities of use,
The rotary drive device according to the invention can be manufactured inexpensively by mass production.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway plan view of a rotary drive device according to the present invention, FIG. 2 is a sectional view taken along line A-B in FIG. 1, and FIG. 3 is a cross-sectional view taken along line C-D in FIG. 1. FIG. 4, a sectional view taken along the line, is an enlarged view of a part of the rotary drive device. 1... Rotation drive device, 2... Peripheral wall portion, 3...
Intermediate lid, 4... Lid, 5... Screw bolt, 6... Casing, 7... Driven part, 8... Notch, 9
... Guide part, 10 ... End face, 11 ... Spiral spring, 12 ... Pin, 13 ... Bearing, 14 ... Rope drum, 15 ... Pin, 16 ... Additional part, 17
... Annular groove, 18 ... Rope, 19 ... Bowden cable, 20 ... Set screw, 21 ... Thread,
22...Clutch portion, 23...Axial shoulder portion, 2
4... Retaining ring, 25... Inner annular groove, 26...
...Axial projection, 27...Axial hole, 28...Chamber,
29...Casing addition part, 30...Spring with legs, 31...End part, 32, 33...Screw, 34...
... Exterior, 35 ... Hole, 36 ... Head, 37 ... Opening, 38 ... Conical addition part, 39 ... Seal ring, 40 ... Set screw, 41 ... Manual operation member.

Claims (1)

[Scope of Claims] 1. A manually operable unidirectional rotary drive device 1 for a spring brake cylinder emergency release device and a slack adjuster return device of a vehicle brake device, which is used to operate a vehicle. a manual operating member 41 disposed at an easily accessible location; a conversion mechanism disposed on the emergency release device or return device that converts the operating movement into rotational movement; and the manual operating member 4.
1 with coupling means 18, 19 for coupling the manual operation member 4 with the conversion mechanism.
1 is configured to be pulled out substantially linearly from the rest position, and the coupling means 18, 19 are
A rope drum 14 configured as a rope device or Bowden cable 19 transmitting the withdrawal movement to the conversion mechanism, on which the conversion mechanism is rotatably mounted.
, which serves to wind up the core of a rope 18 or Bowden cable 19 of a rope device connected at one end to the rope drum 14, and furthermore, the rope drum 14 is rotatably loaded in the winding direction by a winding spring. via clutches 26 and 27 which are connected in the direction of rotation of the payout and disconnected in the direction of the winding rotation.
Rotary drive device for an emergency release device for a spring brake cylinder and a return device for a slack adjuster of a vehicle braking system, characterized in that it can be connected to the driven part 7 of the emergency release device or return device. 2. Rotary drive device according to claim 1, wherein the clutches (26, 27), in their disengaged state, prevent the transmission of torque from the driven part (7) to the rope drum (14) in both rotational directions. 3. A rope drum 14 is rotatably but axially non-displaceably supported in a non-rotatable casing 2, 3, 4 which is rigidly connected to the emergency release or return device and acts as a hoisting spring. Rotationally loaded by a spiral spring 11, the rope drum 14 slides axially onto the casing 2, 3, 4 via a thread 21 with a thread pitch so steep that it does not create a self-locking effect. It is screwed into a clutch part 22 which is mounted movably and only rotatably against resistance, and which, during axial sliding, connects by rotation of the rope drum 14 in the unwinding direction. 26,
3. The rotary drive device according to claim 2, wherein the rotary drive device is connectable to the driven part 7 via 27. 4. The clutch part 22 is designed in the form of a sleeve and is screwed into the central recess of the rope drum 14, so that a housing extension 29, approximately U-shaped in cross section, enters the chamber 28 surrounded by the clutch part 22. The casing extension 29 penetrates into the space between the clutch part 22 and the casing extension 29 with a leg end 31 which surrounds said casing extension and is bent approximately radially inward. A foot spring (30) is arranged loosely surrounding the leg end of the clutch part (22), the outer peripheral surface of the foot spring being in contact with the inner wall of the clutch part (22) by a frictional connection. The rotary drive device described. 5. Rotary drive according to claim 4, wherein the axial sliding movement of the clutch part 22 is prevented by stops 23, 24 for the rope drum 14 during rotation of the rope drum in the winding direction. 6 The outer peripheral surface of the leg spring 30 is the clutch portion 22
The rotary drive device according to claim 4 or 5, which engages with the inner annular groove 25 of the rotary drive device.