Belt type continuously variable transmission system

A hydraulic control device in a belt type continuously variable transmission system comprising:

• an input pulley and an output pulley;
• a belt type continuously variable transmission device in which a transmission belt is racked across said input pulley and an output pulley, and a rotational force is transmitted from said input pulley to said output pulley continuously variably,
• an auxiliary transmission device in which hydraulic pressure servo devices of a braking device and a clutch device are selectively actuated to achieve a predetermined shift speed;
• said auxiliary transmission device being disposed in the upper portion of said continuously variable transmission system and spaced apart from an oil pool position of said continuously variable transmission system;
• and
• a hydraulic control device including a valve body provided with various valves for controlling the shift conditions of said transmission system is divided into two bodies including a first valve body and a second valve body, said first valve body being provided at a position close to said oil pool in the lower portion of said continuously variable transmission system, said second valve body being provided at a position close to said auxiliary transmission device in the upper portion of said continuously variable transmission system, said first valve body having a pressure regulator valve for regulating the hydraulic pressures fed to various portions such as a pressure regulator valve, and said second valve body having valves for controlling the operation of the auxiliary transmission device.

A belt type continuously variable transmission system wherein a braking device of a friction multi-plate engaging type is interposed between a ring gear of a planetary gear device and a case member, comprising:

• a cylinder member coupled with said braking device with a piston, said cylinder member being formed separately of said case member;
• said cylinder member being engaged with said case member in an axial direction through a cover ring in such a manner that a thrust force generated in said cylinder member is received by said case member;
• said ring gear of said planetary gear device being disposed in such a manner that a thrust force opposite to a thrust force generated in said cylinder member is generated in said ring gear;
• and
• an inner end of said cylinder member and a projected portion of said ring gear are abutted against each other to confrontingly receive said thrust forces.

A belt type continuously variable transmission system comprising a belt type continuously variable transmission device in which a transmission belt is racked across an input pulley and an output pulley and rotation is continuously variably transmitted from said input pulley to said output pulley, and an auxiliary transmission device disposed on the output side of said belt type continuously variable transmission device and having a clutch device and a braking device, both of which are of a friction multi-plate engaging type and coupled to a planetary gear device, comprising:

• a stepped portion formed in a partition member for partitioning a belt type continuously variable transmission device chamber housing said belt type continuously variable transmission device from an auxiliary transmission device chamber housing said auxiliary transmission device;
• said stepped portion including a first small-diameter stepped portion and a second large-diameter stepped portion when viewed from said auxiliary transmission device chamber;
• a hydraulic cylinder device of said input pulley disposed at the position of said belt type continuously variable transmission device chamber opposed to the position of said first stepped portion;
• said clutch device of friction multi-plate engaging type being disposed at the position of said auxiliary transmission device chamber opposed to said first stepped portion;
• and
• said braking device of friction multi-plate engaging type being disposed at the position of said auxiliary transmission device chamber opposed to said second stepped portion and at a position radially outwardly of said planetary gear device.

A power transmission device in a belt type continuously variable transmission system comprising a planetary gear device and a clutch device of friction multi-plate engaging type, wherein:

• said planetary gear device includes a sun gear, planetary gears supported by a carrier and a ring gear;
• and said clutch device and said sun gear of said planetary gear device is connected to each other through a disc-shaped flange member wherein a hollow space is formed between the carrier on the side where said flange member is disposed and said sun gear;
• and
• an inner portion of said flange member is bent in a direction of said hollow space and said sun gear is connected to said flange member in said hollow space position at a position located radially inwardly of the carrier and also within the axial width of the carrier.

A belt type continuously variable transmission system including a belt type continuously variable transmission device comprising:

• an auxiliary transmission device including a planetary gear device provided on a rotary shaft of an output pulley of said belt type continuously variable transmission device;
• a rotary shaft of a reduction gear device provided linearly coaxially with the rotary shaft of said output pulley in a manner to be detachable from the rotary shaft of said output pulley and rotatable relative to each other;
• a lubrication path having an opening at the shaft end of the rotary shaft of said reduction gear device formed in the rotary shaft of said reduction gear device and the rotary shaft of said output pulley, and being communicated with each other;
• a seal member provided in a portion wherein the rotary shafts of said reduction gear device and said output pulley are coupled to each other;
• and
• an output member of said planetary gear device of the auxiliary transmission device spline-coupled to the rotary shaft of said reduction gear device in a manner so as to be integral in a rotating direction, but detachable in an axial direction.

A belt type continuously variable transmission system comprising:

• a belt type continuously variable transmission device wherein a transmission belt is racked across an input pulley and an output pulley and rotation is continuously variably transmitted from said input pulley to said output pulley;
• and
• an auxiliary transmission device in driving connection with the belt type continuously variable transmission device and having at least a forward-reverse shift mechanism,
• wherein said belt type continuously variable transmission device and said auxiliary transmission device are respectively housed in a belt type continuously variable transmission device housing and an auxiliary transmission device housing, both of which are formed by case members and separated by a radial partition member of said case members into independent chambers, respectively, and wherein said auxiliary transmission device is detachable from said continuously variable transmission device housing as an independent unit.