KR19980064162A - Clutches operated endstop in transfer cylinder housing with piston rod receiving endstop - Google Patents

Abstract

The present invention relates to a hydraulic cylinder of a vehicle including a housing (3) or a transmission cylinder for a braking device, in which a piston (4) is provided so that it can perturb in the longitudinal hole (13). The piston (4) is then connected to a pedal device that can be manually operated with the piston rod (5) and to a control distance limit. According to the invention, the piston rod 5 has a stop collar 8 so that the final position of the piston 4 corresponding to one of the clutch shutoff positions is the end stop 7 at the front of the housing 3. Is supported.

Description

Clutches operated endstop in transfer cylinder housing with piston rod receiving endstop

The features described in claims 1 and 9 make it possible to solve the problems with the present invention. Advantageous broad details of the invention are described in claims 2 to 8 or 10 to 15.

The invention according to claim 1 takes the stop collar into the piston rod and forms an end stop jointly with the transfer cylinder housing in the case of the piston final position corresponding to the clutch cutoff position. In a more advantageous way, this formation of the clutch pedal movement end stop in the compression direction of the transfer cylinder allows shortening of the bending length of the piston rod by an amount occurring between the end stop and the piston point.

At the same time, the stop collar is designed to be supported in front of the transfer cylinder housing, which prevents the piston rod from being installed at a certain point on the housing, which may result in adverse deformation of the housing. The end stop according to the invention of the transmission cylinder can be economically manufactured at the same time, there is no additional assembly cost, and in addition, it is not affected by the function and has a large area of the stop collar at the front of the housing of the transmission cylinder compared to the prior art. The device is not affected by this.

In an advantageous form of the invention the end stop consists of a life contact surface between the housing and the stop collar. Since the housing is convex and the stop collar is concave, the stop collar is supported by the housing over a wide range even in the case of the inclination or diffraction angle of the clutch lever which can be taken at the final position. In order to balance the assembly tolerances when maintaining the piston rod's rotational movement, it is coupled to the socket as well as the piston. This coupling allows for a geometrically optimal contact surface.

The ball center is then set at the same time to form the center of the contact surface so that the sphere is independent of the deflection or diffraction angle of the piston rod. One-sided loads that can cause bending of the piston rod are thereby prevented in a more advantageous way.

Considered as an advantageous form of the invention, the geometric center portion or position of the radius R of the housing front is made equal to the R of the stop collar of the piston rod. This design optimizes the spherical support of the piston rod in the transfer cylinder housing. The spherical or cap-shaped support can be further optimized by slightly increasing the radius of the transfer cylinder housing relative to the radius of the stop collar. This action improves the contact state in the case of elastic deformation of the cooperating parts. As an alternative, it is appropriate to equalize the radii. Radius-tolerances give a positive tolerance to the housing and a negative tolerance to the stop collar. It is designed to give. This tolerance supports the need for improved contact at the same time as the radius of the housing is always greater than or equal to the radius of the stop collar.

In order to limit the maximum surface pressure occurring at the end stop, the road stop shall cover at least 40% of the front of the housing.

As a measure to produce an economical piston rod, it has an integral road stop. In order to optimize the weight while maintaining sufficient strength at the same time, the piston rod has a nearly cross-sectional shape that can be reinforced with additional ribs if necessary. As an alternative to this, a piston rod in the form of a cavity, for example in the form of a cylinder or quadrilateral, is suitable.

As an alternative, it is particularly advantageous to consider a separate rod stop made of a material with greater strength compared to the piston rod material. This road stop is coupled to the piston rod so as not to detach, for example by ultrasonic welding. As a road stop it is also advantageous for the piston rod to take into account the stop ring.

As a piston rod material, the present invention is contemplated as a plastic material of internal pressure, in particular fiber reinforced plastics such as PA 66 GF. It is desirable to fabricate a transfer cylinder housing with the plastic at the same time in order to fit the same pair of materials.

According to the invention according to claim 9, the transmission cylinder also takes into account the piston end stop, which limits the piston movement at any movement position of the clutch. In addition, a spring is inserted in the housing to provide an economical and easy-to-assemble solution including a suitable number of parts. The delivery cylinder according to the invention can hereby use an end stop which limits the movement opposite to the compression direction of the piston.

When emphasizing the need for springs that are easy to assemble, this is another form of the invention which can be inserted into the housing from the outside.

In the assembled state, the spring then protrudes into the longitudinal hole of the housing to serve as a piston guide. The spring is then adapted to automatically settle at least on the clamping shoulder of the housing due to the initial stress at the end position.

In particular another U-shaped spring is contemplated, whose web is joined by an arch bridge. The webs can then be inserted into the grooved concave surface of the housing, wherein the free ends of the webs are held open to the entire support or part of the housing in self-assembly in the radial or external radial direction. This structure also supports the demand for an effective form that allows simple assembly of the endstop.

The invention also includes a spring having a form as a clutch spring and having two webs, in particular arranged in parallel, at least the free end of the web being saw blade shaped so that the seat is in close contact with the housing at the end of the clutch spring. Hold. In addition, the formation of a circular clutch spring is also considered. In addition to the U-shaped clutch spring, it is possible to present another appearance.

As an alternative to the spring inserted radially from the outside into the housing, the present invention contemplates a snap ring which can be pinched in a fine groove along the periphery of the housing which can be axially retracted in the longitudinal direction of the other housing. Form the end stop of the movement.

The transfer cylinder mentioned in the drawings and the description of the bar is to develop a transfer cylinder type that is economical and does not interfere with the assembly of the transfer cylinder by taking into account the end stops in both directions of operation of the piston.

The present invention relates to a hydraulically actuated clutch of a vehicle or a transmission device for a braking device, including a housing, in which a piston slides along a longitudinal hole. The piston rod of the piston is also coupled as freely but pivotally as in the pedal arrangement, in connection with the possible pedal arrangement.

This type of transmission cylinder is part of the clutch- or brake actuation. The operation of the release device is caused by the movement of the pressure means in the pressure chamber of the delivery cylinder by the operation of the pedal device causing the sliding of the piston in the delivery cylinder. End stops are used to set certain adjustment distance limits and to prevent breakage of parts that can be canceled by the pedal control device when the manual operation load is excessive.

One actuating device is known from DE-C 34 04 155, where the transmission cylinder and the pedal are mounted on a pedal stand such that the pedal hits the delivery cylinder housing in its final position. Such a structure can cause a malfunction due to the deformation of the transmission cylinder housing because the pedal load acts as a point on the front face of the housing of the housing at the final position. At this time, a large pedal load may lead to an elliptical housing deformation, thereby increasing piston friction related to increased wear.

With respect to the transmission cylinder it is furthermore necessary to accommodate the restoring forces that occur when, for example, the driver's foot falls off the pedal and the pedal is returned to its original position by a return spring.

One transfer cylinder is known from DE-A 31 49 629 as a measure of the reaction forces that can be absorbed in this operation, which allows the ball head pressure rod to rotate within the piston hole by a support element. It is fixed. The support element then has a number of elastic projections whereby some catch the ball while the other is in contact with the housing hole with internal stresses, and at this time the housing hole wall is caught.

In addition, the piston rod is considered a piston rod with an attachment that acts as a stopper to the washer fixed to the circlip in the housing. Its known structure is costly due to its large component range and time consuming assembly.

It is an object of the present invention to develop such a transmission cylinder in an economically viable manner in consideration of the end stop in both operating directions of the piston and not in the assembly of the delivery cylinder.

Embodiments of the present invention are all composed of seven drawings and will be described in more detail below.

1 shows a delivery cylinder according to the invention in particular of a longitudinal section in which its piston rod is supported from the front with a stop collar;

FIG. 2 is a transmission cylinder according to FIG. 1 in which the piston rod is pivoted;

3 is a piston rod according to the invention of the zone cross section in detail;

FIG. 4 shows an assembling spring from which the transmission cylinder housing according to line 4-4 according to FIG. 1 forms a piston stop final stop in the compression direction;

5 shows a spring according to FIG. 4 in detail;

6 is a side view of the spring according to FIG. 4;

7 is an optional spring inserted into the transfer cylinder;

In Fig. 1, the delivery cylinder 1 is shown in simplified cross-sectional view. The transmission cylinder 1 is then mounted to the vehicle body while being fixed to the pedal stand 2. The main part of the transmission cylinder 1 shown in FIG. 1 is a housing 3 in the form of a co-cylinder in order to give the piston 4.

At the end the piston 4 is fixedly connected by a piston rod 5 and a ball cup. Moreover, the piston rod 5 has the ball head 6, and is caught by the corresponding recessed part of the piston 4, and is fixed by the support shoulder part. For operation of the piston 4 a known pedal device, not shown in FIG. 1, is used, whereby manual operation of the pedal is transmitted to the piston 4 by means of a piston rod 5. The front surface 9 of the housing 3 forms an end stop 7 whereby the piston rod 5 abuts the stop collar 8. As can be seen in FIG. 1, the spherical contact surface 14 of the stop collar 8 extends over almost the front surface of the front surface 9. This coincidence of the face prevents the large surface pressure which occurs adversely on the contact surface 14 by the load exerted on the piston rod 5 by the pedal device in the direction of the arrow. Thus, the end cylinder 7 according to the invention does not have any functional influence on the transmission cylinder as compared to the point load flow of the housing 3 which may cause deformation.

In order to set the adjustment distance limit in the direction opposite to the compression direction of the piston 4-the sliding of the piston 4 relative to the direction of the arrow-the housing 3 has an ed stop 10. In addition to this, a spring 11 is used, which is inserted into the groove recesses 12a and 12b of the housing 3 and protrudes radially inward from the longitudinal hole 13 in the assembled state to serve as a piston guide.

The piston rod 5 of FIG. 2 is shown inclined at a predetermined angle α unlike in FIG. 1. The contact surface 14 is mutually spherical with respect to the front surface 9 so that the piston rod 5 stop collar 8 is optimally configured. The front face 9 is also a convex part and the contact surface 14 corresponding to this of the stop collar 8 is a recessed part, so that even when the piston rod is inclined, the load on the larger range of the front face 9 is This works. The spherical contact surface 14 is defined by the radius of rotation R, which coincides with the front collar 9 as well as with the stop collar. This takes into account the share center 25 for the turning radii.

In Fig. 3 an enlarged view of the piston rod 5 is shown here, in particular in which the shaped contact surface 14 is clearly shown in the stop collar 8.

As already described in connection with FIG. 1, the stop collar 8 has a recessed contact surface 14, which is indicated by the radius of rotation R. In particular, the piston rod 5, which is made of plastic due to its weight, has a cross-sectional shape in the shape of a cross on the strength-bearing shape. The cross section of the piston rod 5 is weaker than the cross section from the stop collar 8 to the pedal device between the ball head 6 and the stop collar 8 so as to cope with the maximum adjustment load. The stronger cross section reduces the risk of cracks that may occur when the stop collar 8 is installed on the front side 9 of the housing 3 when the driver applies a large load to the piston rod 5 with a pedal device. .

3 also shows that the bending length around the end of the piston rod from the ball head 6 to the stop collar 8 is shortened, thereby significantly reducing the risk of bending.

4 applies to specifying the end stop 10 according to FIG. 1. The spring position 11 in the assembled state is clearly shown in the cross section along line 4-4 in Fig. 1, which coincides with the outer contour assembly state of the housing 3. The spring 11 then uses two parallel-separated webs 15a and 15b which are entirely U-shaped and joined by an arch bridge 16. For assembly, the spring 11 is fitted to the housing in the radial direction, and the webs 15a and 15b are inserted into the groove recesses 12a and 12b of the housing 3. Due to the initial stress in the radial direction of the webs 15a and 15b, the support ends 17a and 17b disposed on the webs 15a and 15b are unfolded outwardly to the support shoulders 18a and 18b of the housing 3. Getting stuck. At the transition between the bridge 16 and the webs 15a and 15b, the spring 11 is further connected to the support shoulders 18a and 18b in the assembled state of the spring 11 by means of projections 19a and 19b facing outwards, respectively. The structure is switched to the cams 17a and 17b so as to contact the support shoulder.

5 shows the spring 11 in a single piece, from which the individual structure can be seen more clearly. Obviously in the side view of the spring 11 in addition to FIG. 6, this is a washer-type, which can be manufactured at low cost.

In Fig. 7 an optional spring 7 in an assembled form can be seen, which coincides with the spring 11 shown in Fig. 4 and is also U-shaped. Webs 20a and 20b extending from the bridge 24 of the spring 21 are inserted into the recesses 12a and 12b. At the free ends, the webs 20a, 20b are situated in the arc 23 of the housing 3, taking into account the support ends 22a, 22b facing radially inward.

The hydraulic cylinder of the vehicle or the transmission cylinder for the brake system can be manufactured more lightly and cheaply in consideration of the piston's two-way end stop.

Claims (15)

It includes a housing (3) and is installed so that the piston (4) slides along the longitudinal hole (13) in which the piston can be turned by the piston rod (5) to the limit of adjustment distance by manual operation. The piston rod 5 of the piston 4 is connected to the pedal device, and there is no play as in the pedal device, but it is relatively rotatable and connected to the hydraulically actuated clutch- or braking transmission cylinder 1 of the vehicle. In The piston rod 5 has a stop collar 8 so that the final position of the piston 4 along the position at which the clutch is released is supported by the end stop 7 at the front of the housing 3. cylinder. The method of claim 1, The spherical contact surface 14 is considered between the housing 3 and the stop collar 8 within the range of the end stop 7, and the housing 3 is convex and the stop collar 8 is recessed. A transmission cylinder, characterized in that it is of type iii). The method of claim 2, A transmission cylinder, characterized in that the geometric position of the center 25 from the rotation radius R on the front face of the housing 3 coincides with the rotation radius R of the stop collar 8. The method of claim 1, The stop collar 8 is in surface contact with the front surface 9 of the housing 3 at the diffraction angle of the piston rod 5 irrespective of the guide, wherein at least 40% of the front surface is transmitted. cylinder. The method of claim 1, The stop collar (8) is a transmission cylinder, characterized in that integrally coupled with the piston rod (5). The method of claim 1, A transmission cylinder, characterized in that the piston rod (5) is a transmission cylinder, characterized in that the cross-sectional shape almost. The method of claim 1, The piston rod (5) is a separate transmission cylinder, characterized in that it is provided with a stop collar (8) uncoupled. The method of claim 1, A transmission cylinder characterized in that the material of the piston rod (5) is made of plastic, in particular fiber reinforced plastic material PA 66 GF. The method of claim 1, A transmission cylinder, characterized in that a spring (11, 21) is inserted on the side of the housing toward the pedal unit, so that one end stop (10) is formed at one of the end portions of the piston (4) according to the movement position of the clutch. The method of claim 9, The springs 11 and 21 can be inserted into the housing 3 according to the radial direction of the outside and automatically settle in at least the supporting surface portions 18a and 18b or the arc 23 of the housing under the limited conditions of initial stress in the assembled state. And a transmission cylinder which protrudes in the longitudinal hole 13 along the radial direction of the interior thereof. The method of claim 9, A transmission cylinder, characterized in that its legs (15a, 15b; 20a, 20b) have an entirely U-shaped spring (11, 21) joined by a medium web (16, 24). The method of claim 11, The legs 15a and 15b can be inserted into recesses in the shape of the grooves of the housing. At this time, the free ends of the legs 15a and 15b are formed in a radial direction, and the support surfaces 17a and 17b are respectively outside. The transmission cylinder, characterized in that it is located in the assembled state of the support shoulder (18a, 18b) of the housing (3). The method of claim 11, The legs 20a and 20b can be inserted into the grooves 12a and 12b in the groove shape of the housing 3, and the free ends of the legs 20a and 20b are radially expanded and are radially inward. Each of which has support ends (22a, 22b) and is located in the arc (23) of the housing (3) in the assembled state. The method of claim 9, The clutch spring is used as a shape spring, and is at least secured to the housing (3) at the end of the clutch spring. The method of claim 9, Longitudinal hole (13) is a transmission cylinder, characterized in that the circumference is grooved around the circlip is fixedly inserted to receive the initial stress in the radial direction.