A driving force distribution transmission for vehicles with four-wheel drive
First Claim
1. A transmission for use with a vehicle with four-wheeled drive, said transmission comprising:
- a first drive shaft connected with the front wheels;
a second drive shaft connected with the rear wheels;
a hydraulic clutch connected with the first and second drive shafts and having outer plates and inner plates, the inner plates being capable of frictionally engaging with the outer plates to selectively transmit rotating force between the first and second drive shafts;
a pump connected with the first and second drive shafts and acting to produce a hydraulic pressure corresponding to the difference between the rotational speeds of the drive shafts;
a first oil passage for guiding the oil delivered by the pump into a reservoir;
a restrictor formed in the first oil passage;
a bias spring for pressing the outer and inner plates of the clutch towards each other at all times;
a second oil passage for guiding the oil delivered by the pump into an oil chamber formed in the clutch;
a third oil passage which connects the oil chamber in the clutch directly with the reservoir, by passing the restrictor; and
a selector valve means which, when the difference between speeds of the two drive shafts is small, closes the second oil passage and opens the third oil passage and which, when the difference is large, opens the second passage and closes the third passage.
1 Assignment
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Accused Products
Abstract
A driving free distribution transmission for use with a vehicle with fourwheel drive. The vehicle has first and second drive shafts which are connected with the front and rear wheels, respectively. The transmission has a hydraulic clutch, a differential pump, a bias spring, and a selector valve. The clutch has outer and inner plates which are caused to frictionally engage with each other to transmit rotary power between the two drive shafts. The pump produces a hydraulic pressure corresponding to the difference between the rotating speeds of the drive shafts. The oil delivered by the pump is forced into a reservoir through a first passage in which a restrictor is formed. A second passage connects the pump with an oil chamber in the clutch. A third passage connects the oil chamber with the reservoir without via the restrictor. The spring always presses the outer and inner plates towards each other. When the difference between the speeds of the drive shafts is small, the selector valve closes the second passage and opens the third passage. When the difference is large, the valve opens the second passage and closes the third passage.
9 Citations
5 Claims
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1. A transmission for use with a vehicle with four-wheeled drive, said transmission comprising:
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a first drive shaft connected with the front wheels; a second drive shaft connected with the rear wheels; a hydraulic clutch connected with the first and second drive shafts and having outer plates and inner plates, the inner plates being capable of frictionally engaging with the outer plates to selectively transmit rotating force between the first and second drive shafts; a pump connected with the first and second drive shafts and acting to produce a hydraulic pressure corresponding to the difference between the rotational speeds of the drive shafts; a first oil passage for guiding the oil delivered by the pump into a reservoir; a restrictor formed in the first oil passage; a bias spring for pressing the outer and inner plates of the clutch towards each other at all times; a second oil passage for guiding the oil delivered by the pump into an oil chamber formed in the clutch; a third oil passage which connects the oil chamber in the clutch directly with the reservoir, by passing the restrictor; and a selector valve means which, when the difference between speeds of the two drive shafts is small, closes the second oil passage and opens the third oil passage and which, when the difference is large, opens the second passage and closes the third passage. - View Dependent Claims (2, 3, 4, 5)
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Specification