Antivibration device for a clutch pedal

• US 4,301,908 A
• Filed: 09/17/1979
• Issued: 11/24/1981
• Est. Priority Date: 11/22/1978
• Status: Expired due to Term

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Motor Co., Ltd.
• Inventors: Matsuki, Masashi, Munakata, Teruo, Fukuda, Syozi
• Primary Examiner(s): Krizmanich, George H.
• Application Number:
  US06/076,473
• Time in Patent Office: 799 Days
• Field of Search: 192/109 F, 192/30 V, 192/111 A, 192/111 B, 192/112 C, 192/110 R, 192/99 A, 192/85 R, 138/26, 60/583, 60/586, 60/587, 60/591, 60/592, 92/60, 303/87, 188/1 B, 180/293, 180/300, 183/152
• US Class Current: 192/109.00F
• CPC Class Codes: B60K 23/02 for main transmission clutches
• CPC Class Codes: B60T 8/42 having expanding chambers for controlling pressure , i.e. closed systems
• CPC Class Codes: F16D 2048/0215 for damping of pulsations within the fluid system
• CPC Class Codes: F16D 2300/22 Vibration damping
• CPC Class Codes: F16D 25/14 Fluid pressure control
• CPC Class Codes: F16D 48/02 Control by fluid pressure
• CPC Class Codes: F16L 55/05 Buffers therefor
• CPC Class Codes: F16L 55/053 the gas in the reservoir being separated from the fluid in the pipe

Abstract

An antivibration device for a clutch pedal in a clutch operating mechanism wherein upon depressing the clutch pedal a hydraulic pressure is caused in a master cylinder, which in turn actuates an operating cylinder to operate a withdrawal lever, the device having an oil damper provided in a hydraulic passage communicating between the master and operating cylinders, thereby absorbing fluctuations in hydraulic pressure in the operating cylinder caused by engine vibrations to prevent vibration of the clutch pedal.

Claims

1. An antivibration device for a clutch pedal of a clutch operating mechanism including a master cylinder in which a hydraulic pressure is created by depressing said clutch pedal, an operating cylinder actuated by said hydraulic pressure caused in the master cylinder to operate a withdrawal lever and an oil damper provided in a hydraulic passage communicating said master cylinder with said operating cylinder, wherein said oil damper comprises an oil chamber having ports connected to passages to said master cylinder and said operating cylinder, respectively, a piston slidably fitted in said oil chamber, a resilient member for absorbing fluctuations in hydraulic pressure in said oil chamber through said piston and orifice-forming members disposed in said ports of the oil chamber, respectively, to cause a pressure drop therebetween.

2. An antivibration device as set forth in claim 1, wherein said piston is slidable perpendicularly to a passage between said ports of the oil chamber and said resilient member is positioned in contact with said piston on an outer side thereof.

3. An antivibration device as set forth in claim 1, wherein said resilient member is a rubber spring.

4. An antivibration device as set forth in claim 3, wherein the spring constant of said rubber spring is with the range of from about 28-36 kg/mm.

5. An antivibration device as set forth in claim 1, wherein the diameter of the orifices in said orifice-forming members is approximately 2.5 mm when said hydraulic passage communicating said master cylinder with said operating cylinder has an inner diameter of about 3.2 mm.