Brake system and a method for assembling thereof

Abstract

A caliper for use in a disk brake system where a sufficient amount of grease exists at least in a space formed between a groove for setting a piston seal provided on the inside surface of the caliper body and a piston seal to be set therein, in a space formed between the outer surface of dust boots and said caliper body, and in a space formed by the dust boots, the caliper body, the piston and the piston seal; and a wheel cylinder for use in a drum brake system where a sufficient amount of grease exists at least in a space formed between a piston and a cup seal and in a space formed by the piston, a cylinder body and dust boots.

What is claimed is:  
     
         1 . A caliper for use in a disk type brake system comprising at least a caliper body having a cylinder portion, a piston, a piston seal, and dust boots; said caliper body comprising a first groove for setting said piston seal and a second groove for setting said dust boots, and said piston comprising a third groove for setting said dust boots, 
 wherein a sufficient amount of grease exists in a space formed by said first groove for setting said piston seal and said piston seal attached around said piston, in a space formed by an outer side surface of said dust boots and said second groove formed in said caliper body, in a space formed by an inner side surface of said dust boots and said third groove formed in said piston, and in a space formed by said dust boots, said caliper body, said piston and said piston seal.    
     
     
         2 . A caliper for use in a disk type brake system according to  claim 1 , wherein an edge portion on dust boots side of said first groove formed in said caliper body is latched.  
     
     
         3 . A caliper for use in a disk type brake system according to  claim 1 , wherein said caliper body comprises a fourth groove provided between said first groove and said second groove.  
     
     
         4 . A caliper for use in a disk type brake system according to  claim 3 , wherein said fourth groove has a semi-circular cross section.  
     
     
         5 . A caliper for use in a disk type brake system according to any one of  claims 1  to  3 , wherein said grease also exists on a contact surface between said dust boots and said piston and on a contact surface between said dust boots and said caliper body.  
     
     
         6 . A caliper for use in a disk type brake system according to  claim 1 , wherein said caliper is arranged as a floating type caliper where the caliper body is movably installed with the aid of a pin, wherein said caliper body has a section for receiving said pin and a part of the pin protruded from the caliper body is covered by another dust boots, and wherein a sufficient amount of said grease also exists in a space formed by said another dust boots and said pin, in a space formed between said another dust boots and the pin receiving section of said caliper body, and in a space formed between an outer surface of the pin and said pin receiving section of said caliper body.  
     
     
         7 . A caliper for use in a disk type brake system according to  claim 6 , wherein said dust boots has a bellows portion and a sufficient grease exists in said bellows portion.  
     
     
         8 . A method for assembling a caliper for use in a disk type brake system, which comprises at least a caliper body, a cylinder, a piston, a piston seal, and dust boots, comprising the following steps when said piston is put into said caliper body: 
 a) applying grease to almost a half section of an outer surface of said piston from an inserting end;    b) pressing the piston having grease on the half section thereof into said caliper body;    thereby making said grease exist in a space formed by said dust boots, said caliper body, said piston and said piston seal.    
     
     
         9 . A method for assembling a caliper for use in a disk type brake system according to  claim 8 , further comprising the following step when said piston is put into said caliper body: 
 c) retracting said piston from the caliper body once after pressing the piston having grease on the half section into said caliper body near the inside from an inner edge portion of said piston seal;    d) applying said grease on the outer surface of said piston again; and    e) pressing a whole part of said piston into said caliper body to settle the piston finally.    
     
     
         10 . A method for assembling a caliper for use in a disk type brake system according to  claim 9 , wherein said piston is pressed into said caliper body after repeating said operations c) and a).  
     
     
         11 . A wheel cylinder for use in a drum type brake system at least comprising a cylinder body, a piston, a cup seal being provided between said cylinder body and said piston, and dust boots for covering said cylinder body and said piston, wherein a sufficient amount of grease exists at least in a space formed between said piston and said cup seal, and in a space formed by said piston, said cylinder body, and said dust boots.