Brake cylinder device and disc brake device

Patent metadata

Field	Value
Publication number	US-2016167682-A1
Application number	US-201414908186-A
Country	US
Kind code	A1
Filing date	Aug 5, 2014
Priority date	Aug 6, 2013
Publication date	Jun 16, 2016
Grant date	—

Abstract

The present disclosure increases the braking force of a parking spring brake mechanism without enlarging a device and without substantial increase in cost. The subject of the present disclosure is a brake cylinder device provided with a parking spring brake mechanism wherein a first piston moves in a prescribed braking direction. The brake cylinder device is provided with a brake force transmitting section having an inclined surface 38 that is inclined so as to press a brake output section in an advancement direction by moving along with the first piston in the braking direction. The inclined surface includes a first inclined surface provided in a distal end portion, and a second inclined surface provided in a proximal end portion and inclined more than the first inclined surface with respect to the advancement direction.

First claim

1 . A brake cylinder device comprising:
a parking spring brake mechanism for parking a vehicle, wherein a first piston installed in a first cylinder section travels in a predetermined braking direction due to a biasing force of a first spring installed in the first cylinder section; a brake output section capable of advancing and withdrawing along a direction intersecting the braking direction; and a brake force transmitting section having an inclined surface inclined so as to press the brake output section in an advancement direction by traveling in the braking direction along with the first piston, wherein the inclined surface includes a first inclined surface provided in a distal end portion of the brake force transmitting section, and a second inclined surface provided in a proximal end portion of the brake force transmitting section and inclined more than the first inclined surface with respect to the advancement direction.

2 . The brake cylinder device of claim 1 , wherein the first inclined surface and the second inclined surface are constituted by planar surfaces.

3 . The brake cylinder device of claim 1 , further comprising:
a fluid brake mechanism wherein a second piston installed in a second cylinder section travels in the braking direction; and a transmission mechanism configured to transmit a biasing force of the first piston in the braking direction to the second piston or a shaft section to be displaced along with the second piston, wherein the fluid brake mechanism is formed of a member separate from the second cylinder section and contained in the second cylinder section, and wherein the fluid brake mechanism further includes an internal cylinder member having a cylindrical shape, wherein the second piston slides on an inner circumferential surface of the internal cylinder member.

4 . The brake cylinder device of claim 1 , wherein the brake output section includes:
a sleeve member formed of a cylindrical member having an axis along the advancement direction; and a shaft member configured to travel in the advancement direction relative to the sleeve member when the sleeve member is rotated in a predetermined direction, and wherein the brake cylinder device further comprises a gap adjusting mechanism including: a ratchet mechanism having a ratchet gear configured to rotate integrally with the sleeve member and a ratchet pawl configured to mesh with teeth of the ratchet gear; a link mechanism having a first link member connected to the ratchet pawl at one end thereof, wherein the ratchet pawl is configured to travel in a direction opposite to the predetermined direction and mesh with the teeth when a pressed section provided on the other end of the first link member or a second link member swingably connected to the other end of the first link member at one end thereof is pressed for a predetermined distance or more; and a link pressing mechanism configured to press the pressed section so as to move the ratchet pawl in a direction opposite to the predetermined direction.

5 . The brake cylinder device of claim 4 , wherein the link pressing mechanism includes:
a lever member formed so as to be swingable around a proximal end portion thereof, wherein an application portion between the proximal end portion and a distal end section is pressed such that the distal end portion presses the pressed section; and a pressing section provided on a member fixed on or integrated with the first cylinder section and configured to press the application portion traveling in accordance with the traveling of the brake output section in the advancement direction.

6 . The brake cylinder device of claim 5 , wherein the application portion has a recess into which the pressing section is to be fitted.

7 . The brake cylinder device of claim 5 , wherein a portion of the lever member between the application portion and the distal end portion is bent to the pressed section side relative to a direction in which a portion of the lever member between the proximal end portion and the application portion extends.

8 . A disc brake device comprising:
the brake cylinder device of claim 1 ; and a caliper body equipped with the brake cylinder device and mounted on a vehicle, wherein, when the brake cylinder device operates, a pair of brake pads mounted on the caliper body nips a disc on a wheel axle to be braked, so as to produce a brake force.

Assignees

• Nabtesco Corp

Inventors

• Asano Yoshio
• Oie Hideyuki

Classifications

• B61H13/00

  Actuating rail-vehicle brakes · CPC title

• F16D2123/00

  Multiple operation forces · CPC title

• F16D65/18

  adapted for drawing members together {, e.g. for disc brakes} · CPC title

• B61H13/005

  Spring actuation · CPC title

• F16D55/2245 Primary

  in which the common actuating member acts on two levers carrying the braking members, e.g. tong-type brakes (similar brakes for rail vehicles B61H5/00) · CPC title