JP2579738Y2 - Automatic transmission for automobile - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic transmission for an automobile, and more particularly to an automatic transmission for improving its operability and noise.

[0002]

2. Description of the Related Art In an automatic transmission for an automobile, as shown in FIG.
Normally, D (drive), 2, 1, N (neutral) and R (reverse) are provided as the travel ranges selected at 0, and mechanical coupling with the engine output shaft during parking cannot be obtained. P (parking) is set to ensure a proper braking action. Then, by selecting the parking range by the select lever, the parking pawl 42 interlocking with the select lever is engaged and locked with the parking gear 40 provided on the transmission output shaft system.

The order of the travel ranges in the select lever section is 1, 2, D, N, R, P. The select lever 10 is connected to the manual valve 32 of the hydraulic control valve 30 via the manual plate 20. , And each port is opened and closed according to the selected range, and the line pressure is supplied to necessary element valves in the hydraulic control valve 30.

Here, the line pressure from the port S is supplied to the circuit of the port M1 at the time of the D range, to the circuits of the ports M1 and M2 at the time of the 2 range, and to the circuits of the ports M1 to M3 at the time of the 1 range. , And in the R range, the line pressure is supplied to the circuit of the port M4.
In the P range, no line pressure is supplied to any of the ports M1 to M4, and the pressure at the port M4 is drained from the port M5. Note that the manual plate 20 is provided on the transmission side in order to accurately correspond to the manual valve 32 and the parking pole 42, and is held at a predetermined position determined for each range by the detent spring 22. ing.

The hydraulic control valve 30 further receives a control command according to the running state from the control unit 50, and switches the reverse clutch 60, the low / reverse brake 62, the high clutch 64 and the other fastening elements 66 in the transmission mechanism. When activated, the gears are shifted smoothly.

[0006]

When parking a vehicle equipped with the above-mentioned automatic transmission, the selector lever is operated from the R range to the P range. However, conventionally, when the selector lever 10 is pulled out of the P range position and is operated to another range for the next run from the parking state, there is a problem that the operation force of the select lever is heavy and an abnormal noise is generated. .

In the R range, a line pressure is supplied to the circuit of the port M4 to generate a so-called R (reverse) hydraulic pressure.
And the low / reverse brake 62 is in the engaged state. When the cause of the above-mentioned trouble is investigated, as shown in FIG. 4, when the select lever is operated from the R range to the P range, the R hydraulic pressure remains in the hydraulic pressure generation range HR0,
It has been found that parking lock is applied in a state where the release of the reverse clutch 60 and the like has not yet been completed, and the power train and the suspension system are elastically deformed by receiving the torque in the reverse direction. That is,
After the clutch is released, the return force of the power train or the like due to the residual torque corresponding to this deformation is applied to the parking gear 4.
When the select lever is pulled out of the P range by applying a load to the engaging surface of the parking pole 42 with the zero, the load becomes heavy, and abnormal noise is generated due to a sudden return of elastic deformation at the moment when the lock is released. .

Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and provides an automatic transmission for an automobile which can operate a select lever from a P range with a light operating force without generating an abnormal noise by eliminating a load of elastic deformation torque. The purpose is to do.

[0009]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a selector lever which can manually select a travel range including reverse and parking, and a manual valve which is connected to the selector lever and can generate reverse hydraulic pressure at a reverse range position. A hydraulic control valve that engages a predetermined fastening element of a transmission mechanism based on the reverse hydraulic pressure, and a parking lock mechanism that is connected to the select lever and locks an output shaft when a parking range is selected. In an automatic transmission for a vehicle comprising:
When the parking range is selected, an interlock mechanism for engaging another fastening element in addition to the predetermined fastening element engaged based on the reverse hydraulic pressure is provided.

[0010]

In the parking range, the fastening elements engaged in the reverse range are kept engaged as they are, and the power train and the suspension system are interlocked by other fastening elements. The power train and the like in the elastically deformed state are held without returning. Therefore,
The parking lock mechanism is engaged and released in a state where no return torque is applied, and is not biased at all when the select lever is pulled out of the parking range.

[0011]

FIG. 1 shows an embodiment of the present invention, in which a manual valve 100 is provided in place of the aforementioned manual valve 32. FIG. A manual valve 100 connected to the select lever 10 via a manual plate 20 opens and closes each port according to the selected range. In the manual valve 100, the line pressure from the port S is supplied to the circuit of the port M1 in the D range, the circuit of the ports M1 and M2 in the 2 range, and the circuits of the ports M1 to M3 in the 1 range. Are supplied with line pressure. In the R range, the line pressure from the port S is supplied to the circuit of the port M4. In the R range, the R hydraulic pressure from the port M4 is supplied to necessary element valves in the hydraulic control valve 30, and the reverse clutch 60 and the low / reverse brake 62 are engaged. In the case of the D range, a control command is received from the control unit 50 according to the running state, and the D range pressure is sent to the high clutch 64 and the other engagement elements 66 according to the speed stage to be engaged.

The cylinder wall 10 of the manual valve 100
2, an extension passage 104 extending from the port S in the direction of the port M4 is formed. Even when the spool 106 moves to the P range position closer to the port M4 side than the R range position, as shown in FIG. , Port S and port M
4 communicates with it. As a result, even in the P range, the line pressure from the port S is supplied to the circuit of the port M4. In this P range position, the port M6 is further opened, and the line pressure from the port S is changed to the port M.
6 is output as parking (P) oil pressure. In the N range, no line pressure is supplied to any of the ports M1 to M4 and M6, and the pressure of each port is drained.

In the oil passage from the hydraulic control valve 30 to the high clutch 64, a two-way check valve 34 is provided. Supplied to At this time, the port C2 is closed by the check ball B. Also in the P range, the P hydraulic pressure is input from the port C2 and supplied to the high clutch 64. At this time, the port C1 is closed by the check ball B, and does not affect the D range system.

When the select lever 10 is selected to the P range, the parking lock mechanism operates via the manual plate 20, the parking pawl 42 abuts on the parking gear 40 provided on the transmission output shaft system, and the tooth position is changed. If they are not aligned, they are in a waiting state, and if the tooth positions are aligned, they are engaged and locked.

According to the present embodiment configured as described above,
In the P range, the R hydraulic pressure is maintained as in the R range, and the reverse clutch 60 and the low / reverse brake 62 are in the engaged state. In addition to this, the P hydraulic pressure is supplied, whereby the high clutch 64 is engaged. For this reason, the power train and the suspension system are interlocked by the engagement of the reverse clutch 60, the low / reverse brake 62 and the high clutch 64 while the torque equivalent to the R range is being applied.
There is no torque change between entering and exiting the range, and there is no return of the powertrain or suspension system. Therefore, the parking lock mechanism operates in a state where no torque is applied.

As a result, when the brake is securely applied, the parking gear 40 does not rotate when the shift lever 10 is operated from the P range to another range. No abnormal noise is generated.
Of course, because of a slope or insufficient braking power,
If the vehicle starts moving, the parking gear 40
, The parking pole 42 is engaged, and the parking lock state is secured.

[0017]

As described above, in the present invention, the parking range is provided with the interlock mechanism for engaging other fastening elements in addition to the predetermined fastening elements engaged in the reverse range. In addition, when the parking lock mechanism is operated, a load due to return of the power train or the like is not applied, so that when the select lever is pulled out of the parking range, the operation force does not increase and no abnormal noise is generated.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a view showing an operation state of a manual valve.

FIG. 3 is a diagram showing an entire configuration of a conventional automatic transmission for a vehicle.

FIG. 4 is a diagram showing a relationship between a change in reverse hydraulic pressure and a parking lock in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Select lever 20 Manual plate 22 Detent spring 30 Hydraulic control valve 32 Manual valve 34 Two-way check valve 40 Parking gear 42 Parking pole 50 Control unit 60 Reverse clutch 62 Low / reverse brake 64 High clutch 66 Other fastening elements 100 Manual valve 102 Cylinder wall 104 Extension passage 106 Spool S port M1 to M6 port HR0 Hydraulic pressure generation area HL Parking lock area

Claims (2)

(57) [Scope of request for utility model registration] 1. A select lever capable of manually selecting a travel range including reverse and parking, a manual valve connected to the select lever and capable of generating a reverse hydraulic pressure at a reverse range position, and a transmission mechanism based on the reverse hydraulic pressure. An automatic transmission for a vehicle, comprising: a hydraulic control valve that engages a predetermined fastening element of a portion; and a parking lock mechanism that is connected to the select lever and that locks an output shaft when a parking range is selected. An automatic transmission for an automobile, comprising an interlock mechanism for engaging another fastening element in addition to a predetermined fastening element that is engaged based on the reverse hydraulic pressure when a range is selected. 2. The interlock mechanism supplies the parking oil pressure to the predetermined fastening element and the other fastening elements via a manual valve that generates a parking oil pressure at a parking range position, and a two-way check valve, respectively. 2. The automatic transmission according to claim 1, further comprising a hydraulic circuit configured as described above.