Kanzaki Kokyukoki Mfg. Co., Ltd.

Other

Takumi Fujita

Mizuya Matsufuji

Gen Yoshii

In a traveling transmission in which an auxiliary transmission is interposed between a main clutch and a mechanical transmission, the auxiliary transmission is configured such that power transmission is cut out interlockingly with the disengagement operation of the main clutch. For example, the auxiliary transmission is configured as a high-low speed selector device including a hydraulic-operated first hydraulic clutch and a spring-operated second hydraulic clutch. Preferably, there should be provided a controller for changing the position of a direction switching valve for the first and second hydraulic clutches based on the operation of an operating member such as a pedal for disengaging the main clutch. According to the present invention, it is possible to shorten a time required for a speed change operation by the mechanical transmission and, also, to achieve a smooth operation by the mechanical transmission.

Traveling transmission of working vehicle

A hydraulic clutch assembly is equipped with a spring-drive hydraulic clutch, which includes a gear rotatably mounted on a transmission shaft and a clutch cylinder fixedly mounted on the transmission shaft, first and second friction elements respectively supported on the gear and the clutch cylinder in such a manner as to be slidable along an axis of the clutch (hereinafter sometimes referred to a clutch axis) and relatively non-rotatable thereto, a pressure disk disposed opposite to the friction elements, and a spring for moving the pressure disk towards the friction elements to bring the first friction element into engagement with the second friction element, in which the pressure disk is moved away from the friction elements by an effect of hydraulic pressure, thereby withdrawing the friction elements from engagement with each other.

Hydraulic clutch assembly

A slidable and rotatable first control shaft ( ) and a slidable and rotatable second control shaft ( ) for respectively shifting main and auxiliary speed change mechanisms ( ) project outwardly to one side of a vehicle housing ( ) and are connected respectively to a main change lever ( ) and an auxiliary change lever ( ) which are pivotally supported by a support member ( ) fixedly provided at one side of the vehicle housing. Preferably, the main change lever is disposed at a location where an operator on a seat ( ) can operate the lever easily whereas the auxiliary change lever is disposed at a location where the operator is hard to operate the lever. The support member is preferably composed of a cover member which surrounds the control shafts, lower portions of the change levers, and connecting members ( ) therebetween. An opening ( ) provided to the cover member for assembling the connecting members is closed by a closure member ( ).

Speed change control device for tractors

Two fluid-operated supplementary speed change mechanisms ( ), one of which is formed into a direction-reversing mechanism and the other of which is formed into a high/low speed-selecting mechanism, are provided in a front housing at locations before and behind a bearing support wall ( ) which divides the inside of the front housing into front and rear chambers. Two transmission shafts ( ), on which fluid-operated clutches ( F, R, ) of the supplementary speed change mechanisms are mounted, are disposed non-coaxially and are supported by the bearing support wall, and rotary joints ( F, R, L, H, L) for connecting fluid passages ( F, R, L, H, L) in the transmission shafts, which passages are in fluid communication with the fluid-operated clutches, to stationary fluid passages are formed in outer circumferences of the transmission shafts within an inside of the single bearing support wall.

Transmission assembly for working vehicles

A drive gear ( ) having integral drive teeth ( ) is rotatably mounted on a transmission shaft ( ) for transmitting power to front wheels, and a movable clutch member ( ) having integral driven teeth ( ) engageable with the drive teeth is slidably but non-rotatably mounted on the transmission shaft. A spring ( A) for biasing the movable clutch member into a direction of causing engagement of the driven teeth with the drive teeth is inserted at a part thereof into an axial bore ( ) in the clutch member. A piston ( ) is slidably fitted in a cylinder member ( ) which is fixedly mounted on the transmission shaft at a radially inward location of the drive and driven teeth. The transmission shaft includes a fluid passage ( ) which applies fluid pressure to the piston such that the piston is moved so as to move the movable clutch member into a direction of causing disengagement of the driven teeth from the drive teeth. The front wheel drive clutch of this structure is small in the number of parts, is compact in its axial length, and is rich in durability.

Growing community of inventors

Itami, Japan

Takumi Fujita