JPH02142957A - Cam ring floating vane hydraulic pump-motor type transmission - Google Patents

Abstract

PURPOSE:To secure such a transmission that is high in transmission efficiency and large in a shift range by moving the turning center of a motor cam ring to both directions by means of a slide screw at the outside. CONSTITUTION:A motor cam ring 8 is inset in a slide block 13 and its turning center is made shiftable to both directions by a slide screw 14 at the outside. When turning effort is added to a rotor shaft 3 of a pump from the outside, hydraulic fluid is extruded to a motor from a high-pressure oil hole 16, and then it goes back from the motor by way of a low-pressure oil hole 15 and sucked in. At this time, a rotational direction of the motor is determined by a fact that whether a cam ring 8 is decentered to either side against a rotor shaft, and when eccentricity is the maximum, rotational speed is minimum but output torque becomes maximized. When this eccentricity is zero, output also comes to zero. Thus, such a transmission that is high transmission efficiency, large in a shift range and low in manufacturing cost is secured.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a hydraulic one-rance transmission that continuously changes the rotational speed to transmit engine power to the middle wheels.

(b) Conventional technology Does conventional vehicle transmission have a thickness of +? X) i1
Due to the large size of the person, the simple structure of the vane type hydraulic pump/motor mechanism is avoided, and a piston, a reciprocating oblique shaft, or a swash plate type hydraulic pump/seven-torque type or one type is used.8 Operating noise Despite its superior characteristics of low output torque and low long-term performance deterioration, the vane method is not used (this is because the above-mentioned problem of friction loss cannot be overcome). .

(c) Problems to be invented or solved Vane type hydraulic pump/motor type 1~Lance Mitsushi”
This invention is characterized by reducing the friction loss between the vane and the cam ring, which is said to be a drawback of the cam ring, to 1/10 or less of the conventional one without making any major mechanical modifications. The following is an explanation based on the drawings. FIG. 1 shows a cross-sectional view. 1 is the pump rotor and 2 is the motor rotor. The pump housing 5 is attached to the motor housing 6 and the pump rotor shaft 3
and the rotor shaft 4 of the motor are coaxial. A bearing 9 is fitted into the cam ring 7 of the pump. A bearing 10 is also fitted to the cam ring 8 of the motor, allowing each to rotate freely. The cam ring 7 of the pump is fitted directly into the housing 5, or the cam ring 8 of the motor is fitted into the slide block 13. The structure is such that the rotation center of the cam ring 7 can be moved from side to side by an outer slide screw 14. This is a mechanism for adjusting the amount of eccentricity of the cam ring 8 with respect to the axis of the rotor 2.6 When a rotational force is applied from the outside to the rotor shaft 3 of the pump in the direction of the arrow, the hydraulic oil changes to high-pressure oil. Hydraulic oil that is pushed out to the motor through the hole 16 and returned from the motor through the low pressure oil hole 15 is sucked in. At this time, the direction of rotation is determined by whether the cam ring 8 of the motor is eccentric to the right or to the left with respect to the rotor shaft 4. That is, when it is eccentric to the left as shown in Figure 5 (a), it rotates to the left, and when it is eccentric to the right as shown in Figure 5 (b), it rotates to the right.

When the slide block 13 is in the neutral position, that is, when the rotation center of the cam ring 8 and the rotor 2 overlap, no rotational force is generated in the rotor 2, so the motor output becomes zero, and the hydraulic oil level decreases. The oil circuit is closed. The rotation speed of the rotor 2 is determined by the slide block 13.
It is at its lowest when it is at the maximum eccentric position, and becomes faster as it moves toward the neutral position. Moreover, the output torque becomes smaller. If the direction of rotation is to be reversed, it is necessary to stop the pump and stop the oil supply to the motor, or to cut off the hydraulic pressure. When the rotor 2 of the motor is rotating to the left, the slide block 13 receives a thrust to the right due to hydraulic pressure, and when it is rotating to the right, it receives a thrust to the left. Therefore, if the slide block 13 is moved while the pump is operating, it will be affected by the hydraulic force, so when moving the slide block 13 to change the direction of rotation, it is necessary to suppress the generation of thrust force. . Thrust is suppressed by short-circuiting the hydraulic circuit between the pump and the motor so that no hydraulic pressure is applied to the motor. Reference numeral 17 denotes a short-circuit opening/closing valve which, as shown in FIG.

When the hydraulic oil circuit is closed, no thrust is generated in the slide block 13, so it can be easily moved using the adjusting screw 14. Therefore, in order to reverse the rotational direction of the motor without stopping the rotation of the pump, operate the handle 18 to reduce the hydraulic pressure, move the slide block 13 to the opposite side using the adjustment screw 14, and then use the handle 18 again to open the short-circuit on/off valve. Take the procedure of closing 17.

(E) Function The three functions required for a transmission for a vehicle are a speed change function that can change the speed of the rotational force applied from the engine, a reverse function that can change the direction of rotation, and a clutch function that connects and disconnects the transmission of rotational power. The device of the present invention has the advantage that even if the rotational speed for driving the pump is constant, the handle 14
By moving the slide block 13, the rotation speed of the roller 2 on the motor side can be varied steplessly. When the eccentricity of the cam ring 8 is early or maximum, the rotational speed is the lowest and the output torque is the highest. When the slide block 13 is moved toward the center by the adjusting screw 14, the rotational speed increases accordingly, but the output torque decreases. In other words, constant 1
It is possible to activate a spell. The short-circuit on-off valve 17 has a clutch function that cuts off and on the rotational power.

When a load is applied to the output shaft 4 of the motor, if the class 125 on-off valve 17 is opened, the hydraulic oil will no longer rise above the hydraulic pressure, so rotational power will not be transmitted. This is equivalent to the clutch being disengaged. When the short-circuit on-off valve 17 is closed, the oil pressure increases and power transmission begins. In other words, the state is the same as when the clutch is engaged. Moving the slide block 13 using the adjustment screw 14! In addition to the function of adjusting the rotational speed, the l1 mechanism also functions to reverse the output shaft of the motor. When the eccentricity of the cam ring 8 approaches zero, the rotational speed of the rotor 2 becomes high and the pump discharge pressure becomes abnormally high, making the operation unstable. During reverse rotation, the short-circuit on-off valve 17 shuts off the oil flow in the circuit. Short-circuit the power supply and perform a reverse operation without any interruption.

This operation is the same as the clutch and change operation of a mechanical transmission, but since the opening/closing operation of the short-circuit on-off valve 17 can be controlled freely, slowly or quickly, the power can be switched on and off as well. Easier to operate than the i-type clutch.

(F) Embodiment FIG. 6 shows a case where the pump side is a variable displacement type and the motor side is a fixed displacement type. In this case, the maximum discharge amount on the pump side will be approximately the same as the fixed capacity on the motor side. This is approximately the rotation ratio between the input side to the transmission and the output side when the car is driving at high speed! : This is because it becomes 1.

The pump side structure uses the motor side structure shown in FIG. 1 as is, and the motor side structure uses the pump side structure shown in FIG. 1 as it is. Therefore, the slide 20 for speed adjustment is placed on the motor side, but the gate structure of the short-circuit on-off valve 17 is the same.

(Go to 1) The mechanism of the effect vane hydraulic pump and seven is very compact.
'J F+') can be calculated. The problem of the loss of 1n of friction between the vane and cam ring, which was the biggest obstacle to the practical application of this machine M4, has been solved, and it has become able to withstand high-speed operation, so it can be directly connected to the output shaft of the engine. It's now possible. As a result, it has high transmission efficiency and a large shift range19, and compared to manufacturing the same function mechanically, the number of components can be reduced to less than 1/10, making it possible to significantly increase manufacturing costs. Ta.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view. FIG. 2 is a cross-sectional view taken from the bottom of FIG. 1. FIG. 3 is a sectional view taken along line BB in FIG. Figure 4 shows
A sectional view taken along the line C-C in FIG.'1. FIGS. 5(A) and 5(B) are V sectional views showing the positional relationship when the slide block is eccentric to the left and right with respect to the rotor. FIG. 6 is a cross-sectional view of a combination of a variable displacement pump and a constant displacement pump. 1. Pump rotor 2. Motor 1-tor 3, pump rotor [Nl 4. Motor rotor @5. Pump housing 6. Motor housing 7. Pump cam ring 8. Motor cam ring 9. Pump bearing 10 Motor bearing 11. Pump vane 12° Motor vane 13. Slide block] 4° slide screw 15. Low pressure oil hole 16. High pressure oil hole 17, short circuit on/off valve 18. 1 handle, vane spring 20. slide block

Claims (2)

[Claims] (1) A fixed displacement vane type hydraulic pump with a bearing fitted on the outside of the cam ring so that it can rotate freely relative to the housing, and a cam ring with a bearing fitted on the outer periphery are housed in a slide block, and it is installed from the outside. A variable displacement vane type hydraulic system that can be slid sideways to change the eccentric distance between the rotor and cam ring, as well as the positional relationship between the eccentrics, allowing for stepless speed change and reversal of the rotational direction. A vane hydraulic pump/motor type transmission that incorporates a motor. (2) The cam ring according to claim 1, which uses a cam ring floating variable displacement vane pump on the input side and a cam ring floating constant displacement vane pump on the output side to function as a transmission. Floating vane hydraulic pump/motor type transmission.