JPS58174731A - Automatic speed change gear for car - Google Patents

Abstract

PURPOSE:To provide an automatic speed change gear which can engage rapidly and assuredly by engaging a solenoid clutch in fixed cycle for a short time to cause an engaging gear to generate a vibration of rotating direction, so that the gear is free from a contact state at a plane portion thereof. CONSTITUTION:When a back R position of a selector switch is selected, a slide gear 13 is axially slided to be engaged with a back gear 23 by action of a hydraulic actuator 23. Simultaneously, an output is generated in AND circuit 36 to operate an oscillation circuit 37 so that a control transistor 38 is turned on in a fixed cycle for a short time to pulse-engage a clutch 1. As a result, power of an engine is intermittently transmitted through first-speed gears 9, 10 to the back gear 23, so that the back gear generates vibration in the rotating direction. Therefore, even if the engaging portion of the slide gear 13 contacts at a plane portion thereof, there is slippage in the contact postion to complete the engagement of the slide bear 13.

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-meshing gear transmission, a sliding gear is slid in the axial direction by an actuator using hydraulic pressure or IIE magnetic force, and is connected to a predetermined gear or spline. Mesh to obtain forward or reverse gear. At this time, depending on the position of the meshing gear, the chamfered part provided on the anastomotic 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 may become uncoupled. It may become possible.

This invention was made to solve the above-mentioned problems, and when the sliding gear is slid to select the forward or reverse gear, the electromagnetic clutch is engaged for a short time at a predetermined period, and the meshing gear By generating a vibration force in the direction of rotation, the flat parts are raised from the contact state, and the meshing can be performed quickly and reliably.

An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 shows how engine power is transmitted to the gear shift N structure. a
An example of an automatic transmission for an automobile using a powder clutch as a clutch is shown. In Figure 1, (1) is the electromagnetic powder clutch, and the kneader is the engine crankshaft 7.
) Drive member z<(2+) fixed to (7), driven member (8L upper ik)' life member (2 ) and the outer i[1 of the driven member (8), the annular excitation coil (
The transmission torque of this electromagnetic powder clutch (11 is approximately proportional to the excitation current flowing through the excitation coil (6). (9) (14 is the first speed gear, and the input shaft (8)
Power is transmitted to the gear (9) using a one-way clutch (1
1), and on the other hand, power is transmitted from the gear (to) slidingly fitted to the output shaft (b) to the output shaft (b) by spline fitting to the output shaft (b), This is done by engaging the sliding gear (to) which is movable in the direction of the sliding gear (to) and the meshing tooth portion (b) provided on the gear (00). Note that the output shaft (b) drives the wheels of the automobile via a known differential gear (not shown). 06) is a first speed clutch that is installed in parallel with the one-way clutch (b) and engages or releases force transmission between the input shaft (8) and gear (9) using hydraulic pressure. Depending on the situation, the one-way clutch (b) may lock, causing the input shaft (8) and gear (
9) The power transmission is reversed, and an engine braking effect is obtained.

0η (goods) is the second speed gear, and the gear (b) that fails to fit into the groove on the input shaft (8) is connected to the input shaft (8) by the second arresting clutch (goods), which is engaged or released by hydraulic pressure. The coupling tongue is configured to transmit power from the input shaft (8),
On the other hand, the gear () is formed integrally with the output shaft (b).

Therefore, the second speed power transmission path is completed by engagement of the second speed clutch (b). ■C2η is the 8th speed gear, and the gear ■ is groove-fitted to the input shaft (8), and is engaged with the 8th speed clutch (8th speed clutch) which is engaged or released by hydraulic pressure.
) to the gear eO formed integrally with the output shaft (b), thereby completing the eighth speed power transmission path. (C) is the backward gear, and the hydraulic actuator (C) slides the sliding gear (To) in the axial direction.
By this operation, when the reverse gear is selected, it meshes with the sliding gear (b) and completes the reverse gear power path. ) is the piston of the hydraulic actuator (c), and the three-way pulp Oi! connected to the oil chamber H) is the piston of the hydraulic actuator (c). 1) Pressure oil flows in. Therefore, when the three-way valve operates, it becomes an nII advancing vortex, and when the three-way valve 4 operates, it becomes a fast-receding vortex. −
is a limit switch that detects the operation of the actuator (c), and in the forward position negative, the movable contact c31) is in the forward position tIt.
Contact G is contacted, and in the retracted position, it is contacted with the retracted position contact (to) to close an electric circuit.

Note that (Foundation) is a neutral position contact that closes in the neutral position. 5. FIG. 2 is a block diagram showing an example of the control N pedal part according to the present invention in the automatic transmission control circuit.

In the figure, (to) is a selector switch operated by the driver of the car, at least forward (D) and reverse (R).
, and a neutral (N) position, and generates an electrical signal corresponding to each selected position. (to) is an AND circuit which receives the output signals of the limit switch and selector switch can, and when the selector switch (to) is in the forward (D) or backward (R) position, the limit switch contact C33 (
(to) is not closed with the movable contact Gυ, an output is generated. (B) is an oscillation circuit that generates pulses with a suitable time width at a period determined by the output of the AND circuit (to), and this output is connected to the excitation coil (6) of the electromagnetic powder clutch (1). Drives the excitation current control transistor μs. (to) receives the output of the selector switch (to) and drives the actuator (to) which controls the three-way pulp
b) Road.

In one embodiment of the present invention configured as described above,
It is assumed that the car is currently stopped and the selector switch (to) has been selected by the driver of the car to the neutral (N) position. In this state, the electromagnetic powder clutch (1) is not completely opened, and the sliding gear (+
3) is also in the (N) position. In this state, when the driver selects the reverse (R) position of the selector switch (to), the actuator drive circuit (to) is activated to operate the three-way pulp-1. As a result, pressure oil flows into the oil chamber () of the hydraulic actuator (2), while the hydraulic oil in the oil chamber () is drained through the three-way pulp. The finger gear therefore slides axially and tends to engage the reverse gear. However, depending on the flr 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 generates an output to the AND circuit (to) at the same time as the reverse position is selected, operates the oscillation circuit (b), turns on the control transistor for a short period of time at a constant cycle, and turns on the electromagnetic powder clutch (1). Hold in a pulsed manner.

As a result, engine power is intermittently transmitted to the first gear (9) (via +01 to the reverse gear) [g1
Generates vibration force in the direction of rotation. Therefore, even if the meshing portions of the sliding gears (to) are in contact with each other at the plane portions, a deviation occurs in the contact position, and the meshing of the sliding gears (b) is completed.

When the biting operation is completed, the retracted position contact (to) of the limit switch handle comes into contact with the movable contact Gυ, and the AND circuit (to) stops outputting. As a result, the electromagnetic clutch (IL) is completely opened, and military creep does not occur.

Even when the selector switch (to) is set to the forward (D) position, the electromagnetic clutch (1) is engaged in a pulsed manner, and gear +11 (
(b) Provides vibration in the rotating direction to facilitate coupling of the meshing teeth 5 (141 (b)).

As explained above, in the automatic military automatic transmission of the present invention, the sliding teeth for selecting reverse and forward gears *com, ah
*. By engaging the electromagnetic clutch in a natural manner, the engagement of the sliding gear is facilitated, and the selection of the forward position f11 or the reverse position is ensured. It is possible to complete the process in a short period of time.

In addition, in the above explanation, 1 is used as an electromagnetic clutch.
Although a one-magnetic powder clutch is used as an example, the same effect can be obtained by using an electrically controlled hydraulic clutch, a pneumatic clutch, or the like.

[Brief explanation of the drawing]

FIG. 1 is a route map showing one embodiment of the present invention, and FIG. 2 is a block diagram showing an example of its control circuit. In the figure, (1) is the electromagnetic powder clutch, (γ) is the engine crankshaft, (8) is the input shaft, (9) is the first gear, (7) μs is the second gear. ψ9 is the 8th speed gear, (B) is the output shaft, 08) is the sliding gear, the wheel is the reverse gear, (Foundation) is the hydraulic actuator, ■ is the limit switch, (C) is the selector switch, (to) is the AND circuit,
G71 is an oscillation circuit, the figure shows a control transistor, and (2) is an actuator drive circuit. In the figures, the same reference numerals indicate the same or corresponding parts. Agent Shin Kuzuno - -Q (

Claims (1)

[Claims] In automatic transmissions for automobiles that transmit engine power using an electromagnetic clutch and obtain forward or reverse gears by engaging sliding gears, when forward or reverse gears are selected, the electromagnetic clutch is shielded and held until the sliding gear engages. An automatic transmission for an automobile, characterized in that the automatic transmission is adapted to be engaged in a pulse-like manner at intervals.