JPS58170634A - Automatic speed change gear for car - Google Patents

Abstract

PURPOSE:To smooth engagement of sliding gear by placing an electromagnetic clutch in pulsatory engagement synchronously with an ignition pulse unit engagement of a sliding gear is completed at the time of selection of forward and backward movement steps in an automatic speed change gear implying the combination of an electromagnetic clutch and a speed change gear mechanism. CONSTITUTION:When a switch 35 is operated in a retreating position by an operator during stoppage of a car, a three-way valve 29 is operated through a driving circuit 36. Then, pressured oil flows into an oil chamber 27 of an actuator 24, while the oil in an oil chamber 26 is discharged through a three-way valve 28, therefore, a sliding gear 13 is put in leftward movement through a piston rod. A limit switch 30 is placed in ON state due to an action of the actuator 24, and the output of AND circuit 40 comes to be the same output as the wavy pattern output of a monostable oscillation circuit 39 and is placed in ON state for a short time synchronously with an ignition pulse of a control transistor 41, and an electromagnetic clutch 1 is pulsatingly engaged due to conductivity to a coil 6. As a result, the sliding gear 13 is engaged with a retreating gear 23 without any shock.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic transmission for an automobile in which engine power is transmitted to a transmission gear mechanism by an electromagnetic clutch.

In an automatic transmission for automobiles that combines an electromagnetic clutch and a parallel shaft constant-mesh transmission, 1. A sliding gear is slid in the axial direction by an actuator using hydraulic pressure or electromagnetic force, and a predetermined gear or spline is moved. mesh with the gear to obtain forward or reverse gear. At this time, depending on the position of the meshing gear, the chamfered part of the meshing gear may come off and the flat part may come into contact with it, and as a result of the actuator continuing to push in this state, the gear or spline cannot be held together. Sometimes.

This invention was made to solve the above problems, and when the sliding gear is slid to select forward or reverse gear, the electromagnetic clutch is engaged for a short time in synchronization with the engine's ignition pulse. By causing the meshing gear to generate a vibration force in the rotational direction, the meshing gear can be released from the flat surface contact state,
This is to ensure that the meshing occurs quickly and reliably.

An embodiment of the invention will be described below with reference to the figures. 1st
The figure shows an example of an automatic transmission for an automobile that uses a powder clutch as an electromagnetic clutch that transmits engine power to a gear transmission mechanism. In Figure 1, (1) is the electromagnetic powder clutch, and the kneader is the engine crankshaft (7).
), a driven member (8) that is spline-fitted to the input shaft (8) of the gear transmission mechanism and rotates integrally with the input shaft (8), and an inner surface of the drive member (2) and the driven member (8). Electromagnetic powder (4>, yoke (5) loosely filled in the annular gap formed by the outer surface of
The transmission torque of this electromagnetic powder Clara≠(11) is composed of an annular excitation coil (6) surrounded by an excitation filter (6).
6] is approximately proportional to the excitation current flowing through. (91(1(l)
is the 1st M! Power is transmitted from the input shaft (8) to the gear (9) by a one-way clutch 01), while the output shaft (II) is slidably fitted to the output shaft (b). Power is transmitted to the output shaft (b) by a sliding gear (2) that is spline-fitted and movable in the axial direction
This is done by engaging the end metal tooth part (2) provided on the holder. Note that the output shaft side drives the wheels of the automobile via a known differential gear (not shown). 06) is provided in parallel with the one-way clutch (b), and locks or releases power transmission between the input shaft (8) and the gear (9) using hydraulic pressure. In the first clutch, this first gear clutch (b)
When engaged, the one-way clutch (11) is locked, the rigid force transmission between the input shaft (8) and the gear (g) is reversed, and an engine bushing effect is obtained. (1η (e) is the second gear, and the gear (b) that is groove-fitted on the input shaft (8) is connected to the input shaft (8) by the second gear clutch (b), which is engaged or released by hydraulic pressure. The gear (E) is connected to the output shaft (B) and is configured to transmit power from the input shaft (8).Therefore, the second speed clutch (9) ), the second speed power transmission path is completed. ■―υ is the 8th speed gear, and the gear ■ is the input shaft (8
) is fitted in a groove and engaged with the 8th speed clutch () which is engaged or released by hydraulic pressure to transmit power from the input shaft (8). By transmitting power to the 8th speed stage power transmission path is completed. 2) is a reverse gear, which engages with the sliding gear (2) when reverse gear is selected by operating a hydraulic actuator that slides the sliding gear (2) in the axial direction, completing the reverse gear power path. do.

(C) is the piston of the hydraulic actuator, into which pressurized oil flows in due to the operation of the three-way pulp connected to the oil chamber (B). Therefore, when the three-way pulp is activated, it is in the forward position, and when the three-way pulp is activated, it is in the backward position. The ring is a limit switch that detects the movement of the actuator (c), and in the forward position, the movable contact Gυ is in the forward position! 11 contact (to), and in the retracted position contacts the retracted position contact (to) to close the electrical path.

Note that (Foundation) is a neutral position contact that closes in the neutral position.

FIG. 2 is a four-dimensional diagram showing an example of the control circuit section according to the present invention in the control circuit of the automatic transmission having the configuration shown in FIG. In the figure, (to) is a selector switch operated by the driver of the car, which has at least three positions: forward (forward), reverse (R), and neutral), and outputs an electric signal corresponding to each selected position. will occur. (To) is an actuator drive 1!7 circuit that controls the three-way pulp #4N according to the signal from the selector switch (To). 0 is the ignition coil of the engine, - is the waveform shaping circuit that shapes the voltage of the ignition coil (B) to generate a trigger pulse synchronized with the ignition timing, and if necessary, changes the frequency of the trigger pulse. A diversion path for reduction may also be included.

(to) is a monostable oscillation (b) that operates in response to the trigger pulse of the waveform shaping circuit and generates a pulse of an appropriate duration.
It is a road. he is an AND circuit, a suyotto switch,
Upon receiving the output of the selector switch (to) and the monostable oscillation circuit (to), the selector switch (to) moves forward (D)!
or in the backward (R) position, when the limit switch contacts (to) (to) are not closed to the movable contact OD, the output of the monostable oscillation circuit (to) drives the excitation current control transistor. Therefore, the electromagnetic powder clutch (1) is intermittently engaged for short periods of time in synchronization with the ignition timing.

An embodiment of the present invention having the above-mentioned configuration Assume that the car is currently stopped and the selector switch (to) is set to neutral (no piece position has been selected) by the car driver. In this state, the electromagnetic powder clutch (1) is not completely opened, and the sliding gear (to) is also in the (N) position.In this state, the selector switch (to) is set to the reverse (R) position by the driver. When selected, the actuator drive circuit (to) is activated, causing the three-way pulp to operate. As a result, pressure oil flows into the oil chamber of the hydraulic actuator, while the hydraulic oil in the oil chamber is drained through the three-way pulp. Therefore, the sliding gear (b) slides in the axial direction and attempts to engage with the reverse gear (to). However, depending on the positional relationship between the two gears, the inlet plane parts may come into contact with each other and the two gears may not mesh smoothly. On the other hand, the control circuit selects the reverse (R) position.
The selector switch (to) and the limit switch become high level signals, and the output of AND circuit 1G becomes the same output waveform as the monostable oscillation (to) path (to), synchronizing the control transistor υ with the engine's ignition pulse. ON for a short time to engage the me powder clutch (1) in a pulse manner.

As a result, the power of the engine is intermittently transmitted, and a vibration force in the rotational direction is generated in the reverse gear via the first speed gear (9) (to). Therefore, even if the meshing portions of the sliding gears (2) are in contact with each other on the flat surface, a deviation occurs in the contact position, and the meshing of the sliding gear (2) is completed. When the biting operation is completed, the backward position contact (to) of the limit switch (2) comes into contact with the movable contact Gυ, and the output of the limit switch becomes a low level, so the output of the AND circuit stops. By kneading, the m4 powder clutch (1) is completely released again and no creep of the car occurs. Even if the selector switch (to) is not set to the forward (D) position, the electromagnetic powder clutch (11 is not engaged in a pulsed manner, and the gear Cl0) is set to the rotation direction in the same way as when the reverse (R) position is selected. It gives a vibrating force to the metal teeth at the end and facilitates the bonding of () to ().

As explained above, in the automatic transmission for an automobile of the present invention, during the sliding operation of the sliding gear for selecting reverse and forward gears, the electromagnetic clutch that transmits the engine force to the transmission mechanism is synchronized with the ignition pulse of the engine. By engaging in a pulsed manner, the meshing operation of the sliding gear is facilitated, and it is possible to reliably select the forward position or the reverse position and to complete the operation in a short time. In the above description, an electromagnetic powder clutch is used as an example of the electromagnetic clutch, but the same effect can be obtained by using a hydraulic clutch, a pneumatic clutch, or the like whose transmission torque can be controlled electrically.

[Brief explanation of the drawing]

FIG. 1 is a route map showing an embodiment of the present invention, and FIG. 2 is a block diagram showing an example of its control route. In the figure, (11 is the electromagnetic powder clutch, υ is the engine crank shirt), (sl is the input shaft, (9) (II is the first gear), (17) (E) is the 21st M gear, -1 is the 8th gear, (b) is the output shaft, (2) is the sliding gear, - is the reverse gear, - is the hydraulic actuator, the wheel is the limit switch, (2) is the selector switch, (to) is the actuator drive enclosure , 07) #Sai ignition coil, force is waveform shaping circuit, (to) is monostable oscillation circuit, 0Q is AND 1gl path,
The advantage is the control transistor. In the figures, the same reference numerals indicate the same or corresponding parts. Agent Makoto Kuzuno - 1 t δ Figure 1

Claims (1)

[Claims] ゛ In automatic military automatic transmissions in which engine power is transmitted by an electromagnetic clutch and forward or reverse gears are selected by engagement of sliding gears, when forward or reverse gears are selected, the electromagnetic clutch is held in the engine position until the sliding gear engages. An automatic transmission for automobiles that is patented in that it is engaged in a natural manner in synchronization with the ignition pulse.