JPS61201960A - Hydraulic pump driving apparatus for automatic transmission - Google Patents

Abstract

PURPOSE:To improve substantially fuel consumption by making a drive source for a hydraulic pump of an automatic transmission of a variable speed motor to drive the hydraulic pump with discharge amount corresponding to the running condition of the automatic transmission. CONSTITUTION:A hydraulic pump 1 for an automatic transmission is connected to a variable speed starter motor 2 which is driven on the basis of commands of a control section 3. Detected values of rotational frequency of an engine, throttle opening, oil temperature and oil pressure in the automatic transmission, etc. are sent incessantly to the input of the control section 3 which sends the rotational frequency signal to the motor 2 on the basis of these detected values to drive the hydraulic pump 1 with an optimum discharge amount. Thus, the pump 1 will discharge only the necessary minimum amount of oil so that energy for driving the pump can be substantially reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION U) Industrial Application Public Funds The present invention relates to an automatic transmission, particularly a drive device for a hydraulic pump as a hydraulic power source for an automatic transmission comprising a torque converter and a planetary gear. The present invention relates to a drive device that moves a hydraulic pump using a motor.

←) Prior Art In general, a hydraulic pump for an automatic transmission consists of an internal gear pump, which is installed at the rear of the torque converter and is directly driven by the engine together with the pump impeller of the torque converter.

The pressure oil discharged from the pump is sent to the torque converter and is used as a working oil pressure source for lubricating the planetary gear and controlling the oil pressure.

In addition, in electronically controlled transmissions, that is, automatic transmissions in which clutch and shift operations are automatically performed by a microcomputer, hydraulic pressure is generated before the pump starts, and the pressure (
For this reason, it is necessary to disengage the clutch, and therefore it is necessary to drive the hydraulic pump prior to starting the engine, and for this purpose the hydraulic pump is driven by a motor. and,
As shown in Japanese Patent Application Laid-Open No. 58-116229, the engine starts! ! At 11 o'clock, a hydraulic pump is first driven by a starter motor, and then the engine is started by the starter motor, and the engine rotates. Furthermore, as shown in Japanese Patent Laid-Open No. 59-26651, a device has been devised that detects the concentration of the engine and switches the driving voltage of the motor in two stages.

(c) Problems to be solved by the invention However, in a device in which the pump is directly driven by the engine, the discharge amount increases in proportion to the rfB rotation speed of the engine, but the required discharge amount is also reached at low rotation speeds. Because the pump is set up in this manner, most of the pump discharge amount is wasted as relief during high-speed rotation.

In addition, the device that operates the hydraulic pump 9WA with the above-mentioned motor is as follows:
Because it is used in a device that uses hydraulic pressure to mus the clutch that directly transmits power, changes in line pressure directly affect the driving feeling, so the pump needs to be driven at a nearly constant speed, so the engine rotational speed , the pump rotation speed is not set to the optimum speed according to the throttle opening, etc.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a drive device for a hydraulic pump for an automatic transmission, which drives a t1 hydraulic pump at an optimal 511 shift and significantly improves fuel efficiency.

(b) Means for Solving the Problems As shown in FIG. 1, the present invention links a hydraulic pump l to a variable speed motor 2, for example a starter motor, and fits the variable speed motor 2! II! Based on the signal from the control section 3, the speed of the variable speed motor 2 is adjusted so that the hydraulic pump 1 has an appropriate discharge amount according to the operation of the automatic transmission. It is characterized by:

(e) Operation Based on the above configuration, the control unit 3 receives detection signals such as pump rotation speed, throttle opening, automatic transmission oil temperature and oil pressure, and outputs an appropriate rotation speed signal a to the variable speed motor 2. death,
The motor 2 is rotated at the rotation speed. Thereby, the hydraulic pump 1 is driven with efficient discharge according to the operating state of the automatic transmission.

(F) Examples Below, on page 13, examples according to the present invention will be described.

As shown in FIG. 1, the automatic transmission 5 is fixed to the rear of the engine 6, and the transmission 5 includes a torque converter and a planetary gear. Further, a drive unit 7 according to the present invention is installed on one side outer wall of the automatic transmission 5, and the unit 7 includes a starter motor 2, a hydraulic pump 1, and a switching device 9. The starter motor 2 is composed of a variable speed motor such as a DC motor, and the rotation speed is appropriately controlled in response to a variable speed signal a such as a voltage control signal from the control unit 3, and a gear 10 is attached to the output shaft of the motor 2. Fixed. The hydraulic pump 1 is a rotary constant displacement pump such as a gear pump, and discharges hydraulic oil for the +-lux converter and lubricating oil for the planetary gear, and also serves as a hydraulic pressure source for controlling the plurality of clutches and brakes of the planetary gear. Exhale. In addition, the switching device [9 has a solenoid 11, and 2!1 are connected to the plunger lla of the solenoid 11 to Q12.
is slidably and rotatably supported. Furthermore, the shaft 12
M wheels 13 and 15 are fixed to both ends of the
A large gear 16 is supported in the middle part so that it can only slide freely. The canine teeth 16 are always in mesh with the motor output gear 10, the front end gear 13 can be selectively meshed with a flywheel gear 17 fixed to the engine crankshaft, and the rear end gear 15 is in hydraulic Gear 1 for driving pump 1
Selective engagement with 9. On the other hand, an actuating piece 20 is fixed to @12, and the actuating piece 20 can contact two left and right contact pieces 21 or 22 based on the movement of the shaft 12 by the solenoid 11. The operating piece 20 is connected to the motor 2, the front end contact piece 21 is connected to the start contact ST of the ignition switch 23 together with the coil of the solenoid 11, and the rear end contact piece 22 is connected to the on contact O.
Connected to N. In addition, 25 in the figure is a battery, 26
26b is a suction oil passage that sucks oil from the strainer.

Next, the operation of this *embodiment will be explained.

To start the engine 6, when the driver twists the ignition switch 23 so that the start contact ST turns on, the solenoid 11 is energized and pulls the plunger lla against the spring flb, as shown in Fig. 2. ,
Further, the shaft 12 moves to the left in the figure together with the plunger 11a, and the gear 13 fixed to the left end of the shaft engages with the flywheel gear 17 (ζ).At the same time, the shaft 12
The actuating piece 20 moves to the left in the figure together with the left contact piece 2.
1, the battery 25, the starting liquid acid ST, the operating piece 21, the left contact piece 21 and the motor 2 are closed for 1s, and the motor 2 is started. Then, the rotation of the motor 2 becomes f
It is transmitted to the glaze 12 via JIIllo and 16, and further to the engine 6 via the left end gear 13 and flywheel gear 17! ζ is transmitted to rotate and start the engine 6. At this time, the control circuit 3 receives the signal from the ignition switch 23 and outputs the optimal rotation speed signal for starting the engine, and the motor 2 operates based on the f-number! It rotates at a rotational speed of l″a.

Then, when the engine 6 is started and the ignition switch 23 is turned back to ON, the energization to the solenoid 11 is canceled as shown in FIG. 3, and the plunger l1m is projected and returned to the right by the spring llb. Then, the shaft 12 moves to the right together with the plunger 11a, the left end gear 13 disengages from the flywheel teeth x117, and at the same time, the actuating piece 20 separates from the left contact piece 21, opening the circuit. , the rotational drive of the motor 2 is stopped. Further, with the IK dragon of the cough motor 2 stopped, the shaft 12 further moves to the right, and the right end gear 15 meshes with the pump drive gear 19. At this time, gears 13 and 15
is not rotationally driven, so the disengagement between the left end gear 13 and the 7th live wheel gear 17 and the meshing between the right end gear 15 and the pump driving gear 19 are performed smoothly. and,
At the same time as the gears 15 and 19 mesh, the actuating piece 20 contacts the right contact piece 22, turning on the battery 25, the ignition switch 23, and closing the circuit of the right contact piece 22, the actuating piece 20, and the motor 2. , rotates the motor 2. At this time, if the right end gear 15 does not mesh with the pump drive gear 19 reliably, the actuating piece 20 will not contact the right contact piece 22.
Motor 2 does not rotate.

In this state, the rotation of the motor 2 is transmitted to the shaft 12 via the gears 10 and 16, and further transmitted to the pump drive gear 19 via the right end gear 15, thereby driving the hydraulic pump 1. Then, the engine 6 rotates and the pump 1
In the operating state in which the hydraulic pump A rotational speed signal a such that 1 is the optimum discharge amount is output to the variable speed motor 2, and the motor 2 rotates at an optimum speed according to the constantly changing operating state of the automatic transmission 5. As a result, the hydraulic pump 1 discharges and supplies a sufficient amount of oil to each oil-required location of the automatic transmission without causing any waste.

(G) As described in detail, according to the present invention, the hydraulic pump 1 is interlocked with the variable speed motor 2, and the variable speed motor 2 is connected to the control section 3, so that the control section 3 receives the power from the control section 3. Based on the signal, the speed of the variable speed motor 1 is controlled so that the hydraulic pump 1 has an appropriate discharge amount according to the operation of the automatic transmission, so oil can be applied to the parts that require oil regardless of the rotational speed of the engine 6. Although it is possible to supply the appropriate oil pressure and oil amount to the pump, it is possible to significantly reduce the amount of oil that is wasted, thereby saving the power required to drive the pump and improving fuel efficiency. can. Furthermore, the hydraulic pump 1 can be installed outside the automatic transmission 5, and the automatic transmission 5 can be downsized, particularly in its axial dimension.

Further, if the output gear 10 of the variable speed motor 2 is configured so that the flywheel is interlocked with the gear 17 when the engine is started, and is interlocked with the hydraulic pump gear 19 when the engine is running, the hydraulic pump 1 is not driven during the start. The startability of the engine 6 can be improved. In addition, the starter motor, which was conventionally installed on the engine 6 side, can be installed on the automatic transmission 5 side to serve as a pump drive motor, reducing complexity around the engine and making it cleaner. can.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a drive device for a hydraulic pump for an automatic transmission according to the present invention, FIG. 2 is a diagram showing the state when the engine is started, and FIG. 3 is a diagram showing the state when the engine is running. be. 1...Hydraulic pump, 2...Variable speed motor,
3...Control unit, 5...Automatic transmission, 6...
・Engine, 7... Drive unit, 9...
Switching device, 10...Motor output gear, 11
... Solenoid, 12... Shaft, 17... Flywheel gear, 19... Hydraulic pump drive gear, 20... Operating piece, 21゜22... Contact piece, zs... Ignition sign switch,
ST...Start contact, ON...On contact.

Claims (2)

[Claims] (1) A hydraulic pump drive device in which a hydraulic pump as a hydraulic power source for an automatic transmission is linked to an electric motor, the electric motor being a variable speed motor, and the variable speed motor being connected to a control section. A hydraulic pump for an automatic transmission, characterized in that the speed of a variable speed motor is controlled based on a signal from the control unit so that the hydraulic pump has an appropriate discharge amount according to the operation of the automatic transmission. drive unit. (2) The output gear of the variable speed motor is linked to the flywheel gear or the hydraulic pump drive gear via a switching device that is switched by operating the ignition switch, and the output gear of the variable speed motor is switched to the variable speed motor based on the start contact connection of the ignition switch. The automatic transmission according to claim 1, wherein the output gear is interlocked with the flywheel gear, and the variable speed motor output gear is interlocked with the hydraulic pump drive gear based on the on-contact connection of the ignition switch. Hydraulic pump drive device.