JPH0567864U - Automatic transmission for automobile - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an automatic transmission for automobiles that can operate the select lever from the P range with a light operating force without abnormal noise. [Structure] Cylinder wall 102 of manual valve 100
Is formed with an extension passage 104 extending from the port S where the line pressure enters into the port M4 direction for outputting the R (reverse) hydraulic pressure, and when the spool 106 moves to the P (parking) range position further approaching the port M4 side. In addition, the port S and the port M4 communicate with each other. As a result, the hydraulic engagement states of the fastening elements in the transmission mechanism are the same in the P range and the R range, and there is no torque change while moving in and out of the P range. Therefore, the parking lock mechanism uses the return torque of the power train and suspension system. Operates with no load.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an automatic transmission for automobiles, and more particularly to an automatic transmission for improving its operability and noise.

[0002]

[Prior Art]

 In an automatic transmission for automobiles, as shown in FIG. 3, normally, D (drive), 2, 1, N (neutral) and R (reverse) are provided as driving ranges selected by the driver with the select lever 10. At the same time, mechanical connection with the engine output shaft cannot be obtained during parking, so P (parking) is set to ensure a reliable braking action. By selecting the parking range with the select lever, the parking pole 40 interlocking with the select lever is engaged and locked with the parking gear 40 provided in the transmission output shaft system.

The order of the travel ranges in the select lever section is 1, 2, D, N, R, P, and the select lever 10 is a manual valve of the hydraulic control valve 30 via the manual plate 20. A line pressure is supplied to a necessary element valve in the hydraulic control valve 30 by connecting to 32 and opening / closing each port according to the selected range.

Here, the line pressure from the port S is supplied to the circuit of the port M1 in the D range, to the circuits of the ports M1 and M2 in the 2 range, and the circuits of the ports M1 to M3 in the 1 range. , And in the R range, the line pressure is supplied to the circuit of the port M4. In the P range, the line pressure is not supplied to any of the ports M1 to M4, and the pressure of the port M4 is drained from the port M5. It should be noted that the manual plate 20 is provided on the transmission side so as to accurately correspond to the manual valve 32 and the parking pole 42, and is held by the detent spring 22 at a predetermined position determined for each range. It has become.

The hydraulic control valve 30 further receives a control command from the control unit 50 according to the traveling state, and actuates the reverse clutch 60, the low / reverse brake 62 and the other engagement element 64 in the transmission mechanism unit, It is designed to shift smoothly.

[0006]

[Problems to be solved by the device]

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

In the R range, the line pressure is supplied to the circuit of the port M4, so-called R (reverse) hydraulic pressure is generated, and the R clutch reversely engages the reverse clutch 60 and the low / reverse brake 62. Is in a state. Looking into the cause of the above-mentioned problem, as shown in FIG. 4, when the select lever is operated from the R range to the P range, this R hydraulic pressure remains in the hydraulic pressure generation region HR0, and the reverse clutch 60 It was found that this occurred because the parking lock was applied while the power train and suspension system were elastically deformed due to the backward torque. 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 engaging surfaces of the parking gear 40 and the parking pole 42, and the select lever is moved from the P range. It becomes heavy when pulled out, and abnormal noise is generated due to the sudden return of elastic deformation at the moment the lock is released.

Therefore, in view of the above-mentioned conventional problems, the present invention provides an automatic transmission for a vehicle, which eliminates the load of elastic deformation torque and can operate the select lever from the P range with a light operating force without generating abnormal noise. The purpose is to provide.

[0009]

[Means for Solving the Problems]

 For this reason, the present invention provides a select lever that allows manual selection of a driving range including reverse and parking, a manual valve that is connected to the select lever and that can generate reverse hydraulic pressure at the reverse range position, and a reverse hydraulic pressure based on the reverse hydraulic pressure. And a parking lock mechanism that locks the output shaft when the parking range is selected by connecting with the hydraulic control valve that hydraulically engages the fastening elements of the speed change mechanism to a predetermined state. In the provided automatic transmission for a vehicle, the hydraulic engagement state of the fastening element of the transmission mechanism by the hydraulic control valve in the parking range is the same as that in the reverse range.

[0010]

[Action]

 Since the hydraulic engagement state of the fastening elements of the speed change mechanism is the same in the parking range and the reverse range, the parking range is the state in which the power train and suspension system are elastically deformed by receiving the backward torque in the reverse range. But it is kept as it is. Therefore, since there is no return of the power train, the parking lock mechanism engages without returning torque, and is not urged even when the select lever is pulled out of the parking range.

[0011]

【Example】

 FIG. 1 shows an embodiment of the present invention, which is provided with a manual valve 100 instead of the manual valve 32 described above. The other structure is the same as that of FIG. The manual valve 100 connected to the select lever 10 via the manual plate 20 opens and closes each port according to the selected range. In this manual valve 100, the line pressure from the port S is supplied to the circuit of the port M1 in the D range, to the circuits of the ports M1 and M2 in the 2 range, and the ports M1 to M1 in the 1 range. Line pressure is supplied to each of the M3 circuits. Then, in the R range, the line pressure from the port S is supplied to the circuit of the port M4.

An extension passage 104 extending from the port S toward the port M4 is formed in the cylinder wall 102 of the manual valve 100, and the spool 106 is moved to the P range position closer to the port M4 side than the R range position. Even at this time, as shown in FIG. 2, the port S and the port M4 communicate with each other. As a result, also in the P range, the line pressure from the port S is supplied to the circuit of the port M4. As a result, in the P range and the R range, the hydraulic engagement states of the fastening elements in the transmission mechanism are the same. In the N range, the line pressure is not supplied to any of the ports M1 to M4, and the pressure of each port is drained.

When the select lever 10 is selected to the P range, the parking lock mechanism is operated via the manual plate 20, the parking pole 40 comes into contact with the parking gear 40 provided in the transmission output shaft system, and If the positions are not aligned, the robot is in the waiting state, and if the teeth are aligned, the teeth are engaged and locked.

According to the present embodiment configured as described above, the R oil pressure is maintained in the P range as in the R range, and the reverse clutch 60 and the low / reverse brake 62 are in the engaged engagement state. .. For this reason, torque equivalent to the R range is applied to the power train and suspension system, there is no torque change during entry and exit from the P range, and there is no return of the power train or suspension system. Therefore, the parking lock mechanism operates in the state where no torque is applied. As a result, when the brake is reliably applied, the parking gear 40 does not rotate when the shift lever 10 is operated from the P range to another range, so that an increase in operating force and an abnormal noise occur. Does not occur. Of course, when the vehicle starts to move due to a slope or insufficient braking force, the parking pole 42 is caught in the parking gear 40 to secure the parking lock state.

[0015]

【The invention's effect】

 As described above, according to the present invention, the hydraulic engagement state of the fastening elements of the speed change mechanism is the same in the parking range and the reverse range so that the load due to the return of the power train or the like is not applied when the parking lock mechanism operates. Therefore, when pulling out the select lever from the parking range, the operating force does not become heavy and no abnormal noise is generated.

[Brief description of drawings]

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

FIG. 2 is a diagram showing an operating state of a manual valve.

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

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]

 10 Select Lever 20 Manual Plate 22 Detent Spring 30 Hydraulic Control Valve 32 Manual Valve 40 Parking Gear 42 Parking Pole 50 Control Unit 60 Reverse Clutch 62 Low / Reverse Brake 64 Other Fastening Elements 100 Manual Valve 102 Cylinder Wall 104 Extension Passage 106 Spool S Port M1 to M5 Port HR0 Hydraulic pressure generation area HL Parking lock area

Claims (2)

[Scope of utility model registration request] 1. A select lever capable of manually selecting a traveling range including reverse and parking, a manual valve connected to the select lever and capable of generating reverse hydraulic pressure at a reverse range position, and a transmission mechanism based on the reverse hydraulic pressure. Automatic transmission for a vehicle, which includes a hydraulic control valve for hydraulically engaging a fastening element of a vehicle part in a predetermined state, and a parking lock mechanism that locks the output shaft when the parking range is selected by being connected to the select lever. 2. The automatic transmission for a vehicle according to claim 1, wherein the hydraulic engagement state of the fastening element of the transmission mechanism by the hydraulic control valve in the parking range is the same as that in the reverse range. 2. The manual valve is configured to generate reverse hydraulic pressure even in a parking range position, and the hydraulic engagement states of the parking range and the reverse range are the same. Automatic transmission for automobiles.