CN110758352A

CN110758352A - Parking brake operation device and method

Info

Publication number: CN110758352A
Application number: CN201811443330.2A
Authority: CN
Inventors: 弗洛里安·库布勒
Original assignee: Stroppus Bremsstrott SA
Current assignee: Stroppus Bremsstrott SA
Priority date: 2018-07-27
Filing date: 2018-11-29
Publication date: 2020-02-07
Also published as: DE102018118305A1

Abstract

It is a device (1) for actuating a parking brake, in particular an agricultural vehicle, a commercial vehicle or a work machine. It has a pedal lever (2) with a pedal (3) with a clamping mechanism. The clamping mechanism comprises at least one cam follower (4) on which the pedal lever (2) is pivotably mounted with a pivot pin (6), and a restoring means (8) of the pedal lever (2) bias with the cam follower (11) forms a curvilinear element in the switching heart (18) in a circumferential groove with a characteristic curve (12). The characteristic (12) comprises a first part (13) for the parking brake, a second part (14) for supplying the parking brake closed, wherein a third part (15) of the parking brake locked is used for returning a fourth part (16) of the parking brake open. Wherein the cam member (4) is formed with at least one positive guide (17) and a characteristic curve (12).

Description

Parking brake operation device and method

Technical Field

Described herein is a device and method for parking brake operation, in particular for an agricultural vehicle, a commercial vehicle or a work machine, having a pedal lever with a pedal and a clamping mechanism. Methods of making the foregoing devices are also described.

Technical Field

The clamping mechanism is a mechanical actuator that can occupy two stable layers under compressive forces. The clamping mechanism may be implemented in a rotational or translational manner. The translational clamping mechanism is also implemented in conjunction with a switched heart as a mechanical component. The switching heart typically has circular closed grooves with islands forming the shape of the heart. The pin passes as a background when the switch is actuated in four stages around the circular closed slot. Switching the heart depends on the direction of the pulling force, so the suspension is arranged to rotate 180 °, for example in a clamping mechanism.

JP 2009234352 a describes a parking brake operating device having a clamp mechanism and a four-bar link, which are connected at three pivot points and each of which is suspended at an end. The ejector rod is provided with two return springs and an operating cable. The two return springs act in the same direction on the same pivot point through two different lever arms. The second, following, upper rod is guided in the cam body with the cam follower body. The cam body has an oblong cam portion with a lower shaft hook with a cam follower guided on an outer cam surface. The cam follower body has two rest positions. One position corresponds to an open brake and the second locked position corresponds to a set braking position. The pedal is arranged at the lowest position.

Described herein is a device and a method for parking brake operation, in particular for agricultural vehicles, commercial vehicles or work machines, which is a device having a simple assembly, efficient operation and a simplified role in production.

Disclosure of Invention

Described herein is a device and a method for parking brake operation, in particular for an agricultural vehicle, a commercial vehicle or a work machine, formed with a pedal lever with a pedal having a clamping mechanism, in particular of translational design, comprising at least one cam follower with a pivot pin. A pedal lever is pivotally mounted on the pivot pin and has a return means biasing the pedal lever, wherein a cam follower runs in a trained switch core circumferential slot, having the characteristic curve of a cam member, wherein a first portion of the characteristic curve is open parking brake, a second portion is for supplying a closed parking brake, a third portion wherein the parking brake is locked, and a fourth portion to return to an open parking brake. The cam follower is formed with at least one positive guide and a characteristic curve such that upon a first actuation of the pedal in the raised position with the parking brake open, the cam follower may be diverted from the first section to the second section and depressed and locked in the third closed parking brake section, and in a second actuation of the depressed pedal, the cam follower from the third section may be converted into a fourth section until it may be fixed again in the first section with the parking brake open.

More preferably, the device comprises a device case, in particular a pivot pin, on which a pedal lever is tiltably mounted, arranged across the width of the device case. A more preferred option is to form a return device return spring that biases the pedal lever and is secured to the cross bar across the width of the device case.

The device can thus be constructed as a simplified module in a working machine.

The mode of operation of the device is substantially reduced to two pivotable components, the pedal lever and the cam follower acting as a clamping mechanism and simplified. These two components are special components. All other components are basically standard components. The pedal lever is therefore basically designed as the only pivotable lever part in the device housing, which is connected to the curve element. The pedal lever is preferably formed in an angular U-shape with a long base length in side view. The pedal lever has a hole and a pivot bearing on a specially projecting lever arm links with the parking brake controlled by the pivot bolt and rotates the U-shape of the hinge at the leg end.

In order to increase the effectiveness of the device and the operating method, the first and in particular the third portion have a concave form in the cam follower, with at least one, preferably two, diameters of the cam follower substantially in the direction of the suspension axis of the cam follower. This creates an improved tactile sensation at a stable pedal position and better communicates the position of the pedal to the user.

Drawings

Possible embodiments will now be explained in more detail with reference to the accompanying schematic drawings, which show:

FIG. 1 is a perspective view of the device in a release operating state with the parking brake open;

FIG. 2 is a perspective view of the device with the parking brake closed in an engaged state.

Detailed Description

Detailed description of the inventionfig. 1 shows a device 1 for actuating a parking brake, not shown, in particular an agricultural vehicle, a commercial vehicle or a work machine. The device 1 is constituted by a pedal rod 2, and a pedal rod 3 is mounted on the pedal rod 2. As shown in fig. 1 and 2, the pedal lever 2 is formed in a substantially U-shape. At the end of the left U-shaped leg shown in fig. 1 and 2, the pedal rod 3 is mounted and tightened. The pedal lever 2 is pivotally welded and arranged on a pivot pin 6, which pivot pin 6 supports a pivot bearing 7.

In the middle of the U-shaped pedal lever 2 formed in a side view, a small hole 8 is formed, in which a return device in the form of a return spring 9 in the form of a tension spring is suspended. The return spring 9 is mounted across the width of the device case 19 and is fixed to the crossbar 10. The cross bar 10 has an annular groove, so that the hook at the end of the return spring 9 engages in a form-fitting manner in the annular groove.

The device 1 comprises a clamping mechanism having a positive guide with at least one cam follower 4, 5. The cam followers 4, 5 are formed with a trained switching heart 18 circumferential groove having a characteristic curve 12. In the groove of curve 12, the cam follower 11 runs. The switching heart 18 shown in fig. 1 and 2 is designed to be rotated approximately 180 ° relative to a conventional heart shape. Thus, the applied switching force is upward rather than downward relative to the device 1.

A cam follower 11 is formed on the pedal lever 2, which moves as a background in the groove. The characteristic curve 12 comprises a first part 13 for opening the parking brake, a second part 14 for applying for closing the parking brake, a third part 15 for locking the parking brake, wherein the parking brake is locked, and a fourth part 16 for returning to the opened parking brake with the cross section 13.

The cam follower 11 therefore always passes through these four parts in the same orientation, and a positive guide mechanism 17 is also provided on the cam follower 4. Thus, as shown in fig. 2, the cam follower 11 crosses the four sections 13-16 in the high position of the open parking brake upon the first operation of the pedal 3, so that the cam follower 11 is manoeuvrable from the first section 13 into the second section 14.

The cam member 4 is deepened due to the inverted switching heart 18 in the third section 15 engaging the closed parking brake in the third section 15. In a second actuation of the now recessed pedal 3, as shown in fig. 1 and 2, the cam follower element 11 from the third section 15 can be transferred, due to the positive guide in the fourth section 16, so that it can again be secured in the first section 13 with the parking brake open.

The device 1 is thus formed as a compact module, the device 1 being shown in fig. 1 and 2 on a device case 19. The device box 19 may also be integrally formed as part of a work machine or agricultural machine vehicle. The pivot pin 6 is thus arranged transversely over the width of the device case 19. As a training for the return device return spring 9, which biases the pedal rod 2, hanging on a cross bar 10 across the width of the device box.

The first section 13, in particular also the third sections 13, 15, has a concave form of the characteristic curve 12 in the curve element 4. Substantially in the direction of the suspension axis 20 of the cam follower 4, the cam follower has at least one diameter thickness at the third portion 15 and preferably at least two diameters of the cam follower at the first portion 13.

Thus, for a stable locked position and two operating states, the tactile sensation on the pedal 3 during operation is more clearly and more clearly transmitted. As shown in fig. 1 and 2, the pedal lever 2 is formed as a single lever member in the device case 19, which is directly connected to the cam member 4 through the cam follower 11. At the end of the second axle is a pivot axis 7 formed at the lower corner of the U-shape of the pedal lever 2, and on the right side as viewed in fig. 1 and 2, a lever arm 21 of the leg opposite the pedal portion is formed with a hole 22 for actuating the parking brake link via a pivot hinge 23. The parking brake link may include a pretensioned cable that actuates a hydraulic cylinder for the parking brake.

The forward director 17 may have different designs. The particular embodiment embodied in fig. 1 and 2 comprises at least one first tension spring 24, preferably two springs, as a torsion mechanism that has an effect on the cam follower 4 in order to reliably transfer the cam follower member 11 from the second portion 14 into the third portion 15 and also to transfer the third portion 15 in the fourth portion 16. The first tension spring 24 is fixed between the engaging shaft 26 and a cross bar 30, and the cross bar 30 is hung over the width of the device case 19.

Therefore, it is preferable that the first tension spring 24 is performed twice in parallel. Furthermore, the positive guide comprises at least one further second tension spring 25, which second tension spring 25 is arranged in the opposite direction to the first tension spring 24 on the same attack axis 26 as on the cam follower 4 on the lever 31, the lever 31 being fixed over the width of the apparatus box. All the ends of the spring are positively consolidated on the grooves of the bars or bars 30, 31 as a delay protection.

According to an alternative embodiment, not shown, the forward guide 17 comprises at least one blocking constraint, so that the cam follower 11 is endlessly repeated from the first to fourth portions 13-16 following an outlet circuit, and at least one mechanical lock is provided, so that the return movement of the cam follower 11 is locked in the previous section.

Such blocking of the cam follower 11 may be formed by a mechanical pawl, for example, with a ratchet and a locking spring. The detents may be provided between the second and third portions 14, 15 and the third and fourth portions 15, 16. Also between the fourth and first parts 16, 13, the respective pawl may be formed with a ratchet. Thus, springs 24 and 25 are not required and the corresponding positive control mechanism is performed by the ratchet.

In fig. 2, the device 1 is shown in a perspective view such that the cam followers 4, 5 are arranged to be visible on the left and right sides offset from the pedal lever 2.

It is understood that the return means may form a tension or compression spring.

Fig. 1 and 2 therefore also show a method for actuating a device 1 for a parking brake, in particular a device for an agricultural vehicle, a commercial vehicle or a work machine, forming a pedal lever 2 with a pedal 3. Pedal lever 2 with pedal 3, with a clamping mechanism comprising at least one cam follower 4 with pivot pin 6 on which pedal lever 2 is pivotably mounted and with restoring means biasing pedal lever 2, wherein the cam follower operates in a circumferential characteristic curve of a trained switching heart 18, wherein the characteristic curve of a first section 13 is an open parking brake, a second section 14 is for supplying a closed parking brake, a third section 15, wherein the parking brake is locked, and a fourth section 16 for returning an open parking brake.

The cam member 4 is formed with at least one positive guide 17 and a characteristic curve 12 such that when the pedal 3 is actuated for the first time in the raised position and the parking brake is open, the cam follower 11 is guided out of the first section 13 into the second section 14 and into the third section 15 into engagement with the parking brake closed. In a second operation of the recessed pedal 3, the cam follower 11 is transferred from the third portion 15 into the fourth portion 16 until it is again fixed in the first portion 13 with the parking brake on.

The backup is done by the explicit lock in section 13. The pedal lever 2 comprises a lever bow 27, so that a push button 28 is pressed when the brake is released and is released when the parking brake is switched off. Thus, electric and electronic parking brake monitoring may be achieved. The apparatus box also includes an opening at the bottom, and a lid 29 for draining the collected waste water. As shown in fig. 2, the cam follower comprises two parts, namely curved elements 4, 5 parallel to the left and right sides of the side of the device case 19, each having a characteristic curve 12 in the form of a groove.

The method for manufacturing the device comprises the following steps: the pedal rod 2 is produced as a fuel part by flame cutting and welded to the pivot pin, and the return means are suspended from both sides of the pedal rod 2 and the pedal rod in the form of return springs 9 in holes 8. As shown in fig. 2, the cam followers 4, 5 are suspended on a suspension shaft 20 with a cam follower 11, such that the cam follower 11 extends in a groove of the cam 12 and is arranged as a transverse bar substantially below the aperture 8 and perpendicular to the direction of the return spring 9 in the pedal rod 2. On the cam follower, a first spring 24 and a second spring 25 are fixed on the attack shaft 26 with transverse bars 30, 31, respectively, as a positive guide mechanism.

The manufacturing method of the device has the following advantages: simple mechanical devices can be assembled on essentially two special parts and many standard parts in a fixture box.

The above-described method and apparatus variants are only provided for a better understanding of the structure, operation and nature of the proposed solution; they do not limit the teaching of the exemplary embodiments. The figures are schematic representations, in which the basic properties and effects are shown, partly greatly enlarged to clarify the function, the operating principle, the technical configuration and the features. In this case, each mode of operation, each principle, each technical embodiment and each feature disclosed in the drawings or in the text may be freely and arbitrarily combined with other modes of operation, principles in all claims, each feature in the text and other drawings, the technical embodiments and features included in or resulting from the disclosure, so that all conceivable combinations are ascribed to the described solutions. In this case, the combination between all individual versions in the text, that is to say in each part of the description, in the claims and in the text, in the claims and between different variants in the drawings.

Although the apparatus and method details discussed above are presented in context; however, it should be noted that they are independent of each other and can be freely combined with each other. The various portions and the ratios between the portions and their sizes and ratios shown in the figures are not limiting. Rather, the individual dimensions and proportions may differ from those shown.

The claims are also not limiting of the disclosure and therefore are not limiting of all possible combinations of the identified features with each other. All features shown are also explicitly disclosed separately and in combination with all other features.

Claims

1. A device (1) for actuating a parking brake, in particular an agricultural vehicle, a commercial vehicle or a work machine, having a pedal lever (2) with a pedal (3), having a clamping mechanism comprising at least one cam follower (4) with a pivot pin (6); -pivotally mounting and returning means (8) at the pedal lever (2), the cam follower (11) exerting a force on the pedal lever (2), such as a characteristic curve switching heart (18), formed in the circumferential groove (12) the cam member (4) is running, wherein the characteristic curve (12) comprises a first part (13) for the parking brake, a second part (14) for feeding the parking brake closed, wherein a third part (15) and a fourth part (16) where the parking brake is locked are for returning the parking brake open, wherein the cam follower (4) has at least one forward guide (17) and the characteristic curve (12) is formed such that the cam follower (11) can be turned from the first part (13) to the second part (14) when the pedal (3) is in a raised position with the parking brake open; the third portion (15) can be locked in engagement with the parking brake, and during a second actuation of the recessed pedal (3), the cam follower (11) can be transferred from the third portion (15) to the fourth portion (16) until it returns to the position shown in the figures; the first part (13) is provided with an open parking brake, which ensures safety.

2. The device (1) according to claim 1, wherein the device (1) comprises a device box (19), wherein in particular the pedal lever (2) is pivotably mounted on the pivot pin (6) over the width of the device box (19); and further preferably a return spring (9) designed as a return means (8) biasing the pedal rod (2) fixed to the cross bar (10) across the width of the device case.

3. Device (1) according to claim 1, wherein the first portion (13) and in particular the third portion (15) have in the cam follower (4) a concave form of a characteristic curve (12) substantially in the direction of the suspension axis (20) of the cam follower (4) with at least one, preferably two diameters (11) of the cam follower.

4. Device (1) according to claim 1, characterized in that the pedal lever (2) is designed as a single lever part in the device case (4) which is directly connected with the cam follower, in particular with respect to a hole (22) in the protruding lever arm (21) formed by the pivot bearing, so that the lever arm (21) carries the pivot pin (6) with respect to the pivot bearing (7) for controlling the parking brake link with the pivot hinge (23).

5. Device (1) according to claim 1, wherein said forward guide (17) comprises at least one first spring (24), preferably two springs (24), acting as a torsion mechanism acting on said cam follower (4), said torsion mechanism being fixed on a transverse bar (30).

6. Device (1) according to claim 1, wherein the forward guide (17) is arranged on a lever, in particular a transverse lever (30), on a device box (19), at least one further second tension spring (25) on the same attack axis (26) on the cam follower (4) in the opposite direction to the first tension spring (24).

7. Device (1) according to claim 1, wherein the forward guide (17) comprises at least one blocking guide, such that the follower (11) circulates endlessly from the first portion (13) to the fourth portion (16) and provides at least one mechanical barrier; thus, the return movement of the cam follower (11) is locked in the previous part, in particular the mechanical lock comprises a ratchet.

8. Device (1) according to claim 1, characterized in that cam followers with an internally formed characteristic curve (12) are formed on the left (5) and right (4) in each case, which characteristic curve (12) is formed as a groove parallel to the side surface of the device case (19).

9. Method for actuating a device (1) for a parking brake, in particular an agricultural vehicle, a commercial vehicle or a work machine; a pedal lever (2) with a pedal (3), with a clamping mechanism comprising at least one cam follower (4), with a pivot pin (6); a pedal lever (2) is pivotably mounted thereon, and a return spring biasing the pedal lever (2) has a cam follower (11) extending in a switching heart (18) forming a circumferential characteristic of a cam member, wherein the characteristic a opens a first part (13) of the brake, closes a second part (14) of the brake application, and a third part (15), wherein the parking brake is locked and has a fourth part (16) for returning to the open parking brake; wherein the cam follower has at least one positive guide (17) and a characteristic curve formed such that, when the first actuation of the pedal (3) is in the raised position and the parking brake is on, the curve follower element (11) is guided from the first portion (13) in the second portion (14) and in the third portion (15) into engagement with the parking brake embedded, during the second actuation of the recessed pedal (3) the cam follower (11) being transferred from the third portion (15) to the fourth portion (16) until it returns to the first portion (13) to be fixed with the parking brake open.

10. Method for manufacturing a device (1) according to claim 1, wherein the pedal rod (2) is made by flame cutting as a firing means and welded to the pivot pin; the return means is in the form of the return spring (9) in the bore (8); the bending elements (4, 5) from the pedal lever (2) mounted on the suspension axle (2) on both sides of the pedal lever (2) have a cam follower (11) suspended such that the cam follower (11) runs in a groove of a curve (12) and is arranged as a cross-bar (30) on the cam follower (4) below the hole (8) and perpendicular to the direction in the pedal lever (2), as a striker axle (26) of a positive guide mechanism, a first spring (24) and a second spring (25) of opposite direction being fixed with cross-bars (30, 31), respectively.