Brake operating device

Abstract

A brake operating device in which a stable input/output characteristic of a brake pedal operation amount and a brake booster device transmitted amount can be obtained, and the input/output characteristic can easily be set to a desired form. In the brake operating device, a connecting pin of a push rod is fit in and connected with a connecting hole of a brake pedal. The connecting pin is fit in a guide hole of a guide plate. When the brake pedal swings, the connecting pin moves along the connecting hole while being guided by the guide hole, and a pedal ratio is changed. In this way, the input/output characteristic of the brake pedal operation amount and the brake booster device transmitted amount is non-linear. In this case, because frictional force is reduced, a predetermined, stable pedal ratio can be obtained. A pedal ratio corresponding to a desired characteristic can easily be obtained, and degrees of freedom in design increase.

What is claimed is:  
     
         1 . A brake operating device which transmits swinging of a brake pedal, one end of which is supported so as to be swingable, to a brake booster device via an output member, one end of which is connected to the brake pedal and another end of which is connected to the brake booster device, comprising: 
 a connecting member provided at a connecting portion of the brake pedal and the output member and changing a connecting position, at which the one end portion of the output member is connected to the brake pedal, along directions of approaching and moving away from a center of swinging of the brake pedal; and    a guide member provided separately from and independently of said connecting member and guiding a specific portion of the output member along a predetermined path so as to change the connecting position by said connecting member,    whereby a pedal ratio is varied in accordance with swinging of the brake pedal.    
     
     
         2 . A brake operating device according to    claim 1   , wherein the specific portion of the output member is the one end portion of the output member.  
     
     
         3 . A brake operating device according to    claim 2   , wherein the output member includes a push rod, and said connecting member includes a connecting hole formed at a longitudinally intermediate portion of the brake pedal and a connecting pin provided at a distal end of the push rod.  
     
     
         4 . A brake operating device according to    claim 3   , wherein said guide member includes a guide plate in which a guide hole is formed, the connecting pin provided at the distal end of the push rod being fittable into the guide hole so as to be movable.  
     
     
         5 . A brake operating device according to    claim 4   , wherein the guide hole is curved.  
     
     
         6 . A brake operating device according to    claim 1   , wherein the specific portion of the output member is a longitudinally intermediate portion of the output member.  
     
     
         7 . A brake operating device according to    claim 6   , wherein the output member includes a push rod, and said connecting member includes a connecting hole formed at a longitudinally intermediate portion of the brake pedal and a connecting pin provided at a distal end of the push rod.  
     
     
         8 . A brake operating device according to    claim 7   , wherein the connecting pin is fixed to a holder which is screwed with the push rod, and an entire length of the push rod is adjustable by rotating the holder along a screw.  
     
     
         9 . A brake operating device according to    claim 7   , wherein said guide member includes a guide pin formed at a longitudinally intermediate portion of the push rod and a guide plate in which is formed a guide hole into which the guide pin is fittable so as to be movable.  
     
     
         10 . A brake operating device according to    claim 9   , wherein the guide hole is curved.  
     
     
         11 . A brake operating device which transmits swinging of a brake pedal, one end of which is supported so as to be swingable, to a brake booster device via a push rod, one end of which is connected to the-brake pedal and another end of which is connected to the brake booster device, comprising: 
 a connecting member provided at a connecting portion of the brake pedal and the push rod and changing a connecting position, at which the one end of the push rod is connected to the brake pedal, along directions of approaching and moving away from a center of swinging of the brake pedal, said connecting member including a connecting hole formed in a longitudinally intermediate portion of the brake pedal and a connecting pin provided at a distal end of the push rod; and    a guide member provided separately from and independently of said connecting member and guiding the one end of the push rod along a predetermined path so as to change the connecting position by said connecting member, said guide member including a guide plate in which is formed a guide hole into which the connecting pin provided at the distal end of the push rod is fittable so as to be movable,    whereby a pedal ratio is varied in accordance with swinging of the brake pedal.    
     
     
         12 . A brake operating device according to    claim 11   , wherein the guide hole is curved.  
     
     
         13 . A brake operating device which transmits swinging of a brake pedal, one end of which is supported so as to be swingable, to a brake booster device via an output member, one end of which is connected to the brake pedal and another end of which is connected to the brake booster device, 
 wherein the output member is formed by a link mechanism including a pair of rods, and    said brake operating device comprises a link guide member which varies a specific position of the link mechanism with respect to a locus of swinging of the brake pedal,    whereby an input/output ratio of an amount of swinging of the brake pedal and a transmitted amount transmitted to the brake booster device is varied in accordance with swinging of the brake pedal.    
     
     
         14 . A brake operating device according to    claim 13   , wherein the pair of rods of the link mechanism are connected together by a link pin at an intermediate connecting portion, and the specific position is a position of the intermediate connecting portion.  
     
     
         15 . A brake operating device according to    claim 14   , wherein said link guide member includes a guide plate in which is formed a guide hole into which the link pin connecting the pair of rods is fittable so as to be movable.  
     
     
         16 . A brake operating device according to    claim 15   , wherein the guide hole is curved.  
     
     
         17 . A brake operating device according to    claim 15   , wherein the guide hole is formed in a crank-shaped configuration.  
     
     
         18 . A brake operating device according to    claim 13   , wherein the pair of link rods of the link mechanism are connected together by a link pin at a connecting portion position, and the specific position is a longitudinally intermediate portion of one of the rods of the pair of rods.  
     
     
         19 . A brake operating device according to    claim 18   , wherein said link guide member includes a guide pin, which is provided at the longitudinally intermediate portion of the one rod which portion is the specific position, and a guide plate in which is formed a guide hole into which the guide pin is fittable so as to be movable.  
     
     
         20 . A brake operating member according to    claim 19   , wherein the guide hole is curved.