JP2001200874A - Parking brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a parking brake capable of simplifying machine work and capable of reducing a cost. SOLUTION: This parking brake of a planetary gear type transmission has plural brake actuating springs 16 being arranged between an output housing 8 and a brake piston 14 on the output shaft 2 side of the planetary gear type transmission and imparting sandwiching force to a parking brake friction plate 4 and a mating plate 12. An annular groove 20 is arranged on an inside surface of the output housing 8, and a plate-like spring receiving member 30 is placed on one end of the springs 16 to be arranged in the annular groove 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of brake actuating springs which are arranged between an output housing and a brake piston on the output shaft side of a planetary gear type transmission or the like and apply a clamping force between a brake plate and a mating plate. The present invention relates to a parking brake.

[0002]

2. Description of the Related Art FIG. 3 is a sectional view showing a parking brake portion of a conventional planetary gear transmission.
In FIG. 3, reference numeral 2 denotes an output shaft, on which a plurality of parking brake friction plates 4 are attached to a ring gear 7 attached by bolts 6 by means such as splines so as to be movable in the axial direction. ing. 8 is
In an output housing of a planetary gear transmission, a plurality of mating plates 12 are attached to an output housing 8 by pins 10 so that the mating plates 12 cannot rotate around an output shaft and can move in the axial direction. The friction plate 4 described above is inserted into the gap between the plates 12, and the friction plate 4 and the mating plate 12 are assembled in a mutually superposed structure.

[0003] Reference numeral 14 denotes a ring-shaped brake piston, which is housed in a space between the mating plate 12 and the output housing 8. Reference numeral 16 denotes a spring. A plurality of springs 16 are provided between the output housing 8 and the brake piston 14, and press the brake piston 14 toward the parking brake friction plate 4 and the mating plate 12, and 4
And the opposing plate 12 to make the output shaft 2 unrotatable.

A parking brake air chamber 18 is formed on the opposite side of the spring 16. When air is introduced into the parking brake air chamber 18 from the outside, the brake piston 14 opposes the pressing force of the spring 16. The output shaft 8 is pushed toward the output housing 8 to release the pressing force of the spring 16 against the friction plate 4 and the mating plate 12, and in this state, the output shaft 2 becomes rotatable. The springs 16 are arranged on the inner surface of the output housing 8 in a line in a formed annular groove 20.

FIG. 3 shows an annular groove 20 formed on the inner surface of the output housing 8 for disposing the spring 16. In order to arrange the springs 16 in the annular groove 20 without interfering with each other, a predetermined distance is maintained between the spring seats 22.
Are machined (perforated). Since it is necessary to pierce a predetermined number of such spring seats 22 at predetermined intervals, N
It is processed by a C processing machine or the like.

[0006]

As described above, in the conventional parking brake of a planetary gear type transmission, the parking brake friction plate 4 and the mating plate 12 are used.
It is necessary to machine the spring seat 22 for disposing the spring 16 for pressing the spring 16. Spring seat 22
Since an NC processing machine or the like is used in the processing of (1), the processing time and setup time are increased and the cost is increased.

The present invention relates to a parking device having a plurality of brake actuating springs disposed between an output housing and a brake piston on an output shaft side of a planetary gear type transmission or the like to apply a clamping force between a parking brake friction plate and a mating plate. An object of the present invention is to provide a parking brake in which machining is simplified.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a plurality of parking brake friction plates disposed between an output housing and a brake piston on an output shaft side to apply a clamping force to a parking brake friction plate and a mating plate. In a parking brake having a brake operating spring, an annular groove is provided in the output housing or the brake piston,
A parking brake having a structure in which a dish-shaped spring receiving member is disposed in the annular groove and one end of each of the springs is located in the dish-shaped spring receiving member.

In the parking brake of the present invention,
Since the dish-shaped spring receiving member is placed at one end of each spring, the adjacent springs do not come closer any more when the edge of each spring receiving member abuts, so that the springs do not interfere with each other. Therefore, unlike the conventional parking brake, there is no need to machine a spring seat for arranging the spring, and the cost can be reduced.

[0010] In the parking brake of the present invention,
It is only necessary to lathe the annular groove 20 as shown in FIG. In the parking brake according to the present invention, if the dish-shaped spring receiving members are arranged in a line without any gap, the adjacent springs do not move relative to each other, so that the structure is stabilized.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A parking brake according to the present invention will be specifically described below with reference to an embodiment shown in FIG. 1 in which the parking brake is applied to a parking brake of a planetary gear type transmission. In FIG. 1, the same parts as those of the structure of the conventional planetary gear type parking brake shown in FIG. 3 are denoted by the same reference numerals, and redundant description thereof will be omitted.

In FIG. 1, reference numeral 30 denotes a dish-shaped spring receiving member. The spring receiving members 30 are arranged in a line in an annular groove 20 formed on the inner surface of the output housing 8 without any gap. One end of the spring 16 is received in each of the spring receiving members 30.

The spring receiving members 30 have springs 16 whose ends are received by the respective spring receiving members 30 at edges of adjacent ones in the annular groove 20.
Will not come closer and interfere with each other.

As described above, in the parking brake according to this embodiment, the spring seat for receiving the spring for operating the parking brake does not need to be bored in the output housing. Since the receiving member only needs to be used, the manufacturing cost can be reduced.

As described above, the present invention has been specifically described based on the illustrated embodiments. However, the present invention is not limited to these embodiments, and the concrete structure thereof is within the scope of the present invention shown in the claims. Needless to say, various changes may be made to the configuration.

For example, in the above embodiment, the case where the present invention is applied to the parking brake of a planetary gear type transmission has been described. However, the parking brake of the present invention can be widely applied to parking brakes other than the planetary gear type transmission.

[0017]

As described above, the present invention has a plurality of brake actuating springs disposed between the output housing and the brake piston on the output shaft side to apply a clamping force between the parking brake friction plate and the mating plate. In the parking brake, an annular groove is provided in the output housing or the brake piston, and a dish-shaped spring receiving member is arranged in the annular groove, and one end of each spring is located in the dish-shaped spring receiving member. Provide parking brake with structure.

In the parking brake of the present invention,
Instead of drilling the spring seat for the spring arrangement like a conventional parking brake, simply put a dish-shaped spring receiving member on one end of each spring,
Adjacent springs do not come closer when the edges of the respective spring receiving members come into contact with each other, so that a spring that does not cause interference between springs can be manufactured at low cost. In the parking brake according to the present invention, when the dish-shaped spring receiving members are arranged in a line without any gap, the adjacent springs do not move relative to each other, so that the structure is stable.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a structure of a parking brake of a planetary gear transmission according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a dish-shaped spring receiver used in the parking brake shown in FIG. 1;

FIG. 3 is a sectional view showing a structure of a parking brake of a conventional planetary gear transmission.

FIG. 4 is a plan view showing a groove formed on an inner surface of the output housing 8 and having a spring seat in FIG. 3;

FIG. 5 is an enlarged sectional view taken along line BB of FIG. 4;

[Explanation of symbols]

 2 output shaft 4 parking brake friction plate 6 bolt 7 ring gear 8 output housing 10 pin 12 mating plate 14 brake piston 16 spring 18 parking brake air chamber 20 groove 22 spring seat 30 spring receiving member

[Procedure amendment]

[Submission date] February 4, 2000 (200.2.4)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0002

[Correction method] Change

[Correction contents]

[0002]

2. Description of the Related Art FIG. 3 is a sectional view showing a parking brake portion of a conventional planetary gear transmission.
In FIG. 3, reference numeral 2 denotes an output shaft, on which a plurality of parking brake friction plates 4 are attached to a ring gear 7 attached by bolts 6 by means such as splines so as to be movable in the axial direction. ing. 8 is
Output housing of the planetary gear type transmission, a rotational Not possible <br/> ability around the output shaft plurality of mating plate 12 by a pin 10 on the cover 9 which is fixed to the output housing 8, movable in the axial direction It is attached in a state,
The friction plate 4 described above is inserted into the gap between the adjacent mating plates 12, and the friction plate 4 and the mating plate 12 are assembled in a mutually superposed structure.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

[0010] In the parking brake of the present invention,
An annular groove 20 as shown in FIG. 1 requires only lathing. In the parking brake according to the present invention, if the dish-shaped spring receiving members are arranged in a line without any gap, the adjacent springs do not move relative to each other, so that the structure is stabilized.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] Explanation of sign

[Correction method] Change

[Correction contents]

[Description of Signs] 2 Output shaft 4 Parking brake friction plate 6 Bolt 7 Ring gear 8 Output housing9 Cover  10 pin 12 mating plate 14 brake piston 16 spring 18 parking brake air chamber 20 groove 22 spring seat 30 spring receiving member

[Procedure amendment 4]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

[Procedure amendment 5]

[Document name to be amended] Drawing

[Correction target item name] Figure 3

[Correction method] Change

[Correction contents]

FIG. 3

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Claims (2)

[Claims] 1. A parking brake having a plurality of brake actuating springs disposed between an output housing and a brake piston on an output shaft side to apply a clamping force between a parking brake friction plate and a mating plate. A parking brake, wherein an annular groove is provided in a piston, and a dish-shaped spring receiving member is disposed in the annular groove, and one end of each of the springs is located in the dish-shaped spring receiving member. 2. The parking brake according to claim 1, wherein the dish-shaped spring receiving members are arranged in the annular groove without any gap.