JP3470446B2 - Speed change assist device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parallel gear type transmission for a vehicle, and more particularly, to a shift assist device for a transmission capable of performing a quick and smooth shift operation. 2. Description of the Related Art In a vehicle transmission, an intermediate gear connected to an intermediate shaft and a transmission gear of each speed stage rotatably supported on an output shaft are constantly meshed with each other, and the transmission is shifted by a known synchronous clutch mechanism. By selectively coupling the gears to the output shaft, the gears of the required gear are achieved. However, when a large vehicle is used, the amount of inertia of the drive transmission system increases, and the operation of the synchronous clutch mechanism to eliminate the rotation difference between the output shaft received from the wheels during the shifting operation and the transmission gear that is interlocked with the intermediate shaft is required. Considerable time and operating power are required. In view of this, there has been proposed a synchronous clutch mechanism provided with an actuator, such as a speed change assist device disclosed in Japanese Utility Model Laid-Open Publication No. H2-141757, but this requires a complicated structure and increases costs. There is a disadvantage. Further, in the shift assist device disclosed in Japanese Utility Model Laid-Open No. 5-12809, an electromagnetic braking force is applied to the shift gear to make the rotational speeds of the shift gear and the output shaft close to each other, but this is effective only for the shift-up operation. However, the number of parts to be added to the conventional transmission is large, and it is difficult to reduce the cost. SUMMARY OF THE INVENTION [0004] In view of the above problems, an object of the present invention is to increase or decrease the load of an oil pump for forcibly lubricating or forcibly cooling a transmission gear of an output shaft.
It is an object of the present invention to provide a speed change assist device in which the rotational speeds of a speed change gear and an output shaft are made close to each other. [0005] In order to achieve the above object, according to the structure of the present invention, an oil pump is connected to an intermediate shaft of a gear transmission via a connection / disconnection clutch, and oil in a gear box is oiled. In a transmission that is sprayed from a top wall portion of a gear box to a transmission gear of an output shaft through a throttle valve by a pump, a transmission sensor for detecting an operation direction of a transmission lever is provided in a transmission operation mechanism, and a throttle is provided based on a signal from the transmission sensor. a control device for controlling the valve and disengaging clutch, said control device is in Shifutoatsupu the throttle valve
During the aperture stop and downshifting, the connection / disconnection clutch is shut off . [0006] The disconnecting clutch is normally in a connected state, and the oil pump sucks oil at the bottom of the gear box, and each speed change is transmitted from the top wall of the gear box through a throttle valve which is normally fully opened. Spray to gears and synchronous clutch mechanism. At the time of shift-up operation, the rotation speed of the intermediate shaft needs to be lower than before the operation. Therefore, if the throttle valve is throttled and the load on the oil pump is increased, the rotation speed of the intermediate shaft decreases, and the rotation speed of the transmission gear approaches the rotation speed of the output shaft,
A quick and smooth shifting operation can be obtained. On the other hand, during a downshift operation, the rotational speed of the intermediate shaft needs to be higher than before the operation. Therefore, if the disconnection clutch is cut off and the load on the oil pump acting on the intermediate shaft is eliminated, the degree of reduction in the rotational speed of the intermediate shaft during operation is reduced, and a quick and smooth speed change operation is assisted. In the present invention, the connection / disconnection clutch is not limited to a normal electromagnetic clutch, but also includes a hydraulic clutch and a pneumatic clutch. In this case, a control device controls an electromagnetic switching valve of a hydraulic circuit or a pneumatic circuit. Has exactly the same effect. FIG. 1 is a side sectional view showing a schematic configuration of a shift assist device according to the present invention, and FIG. 2 is a side sectional view showing a main portion of the shift assist device. As shown in FIG. 1, the clutch box 5 is connected to the front end of the gear box 18 of the transmission so that the gearbox 18 can be used for shifting operation.
The main clutch 3 includes an engine crankshaft 2 and a transmission input shaft 4.
It is configured to shut off between. An output shaft 10 is supported on the gear box 18 coaxially with the input shaft 4.
Are supported in parallel with the output shaft 10. The gear 8 of the input shaft 4 is always meshed with the gear 9 of the intermediate shaft 12. The intermediate gears 39 having different numbers of teeth connected to the intermediate shaft 12 are always meshed with the speed change gears 38 of the respective speed stages supported on the output shaft 10 in a freely rotatable manner. A predetermined transmission gear 38 is selectively rotatably coupled to the output shaft 10 by axial movement of a known synchronous clutch mechanism 35 disposed on the output shaft 10. The speed change mechanism 6 is disposed above the gear box 18, while an oil supply pipe 17a is disposed on the top wall. The oil supply pipe 17a is configured to spray oil from the oil pump 15 to the input gear 8, each of the speed change gears 38, and the synchronous clutch mechanism 35. The configuration described above is almost the same as that of a conventional transmission. According to the present invention, the rear end of the intermediate shaft 12 is cut off.
The oil pump 15 is connected via a contact clutch, for example, an electromagnetic clutch 13. Oil pump 15 sucks oil at the bottom of the gearbox 18 from the inlet passage 14, outlet passage 17, throttle valve
(Preferably an electromagnetic throttle valve) The oil is supplied to an oil supply pipe 17a via 16. A shift sensor 33 for detecting a shift-up operation or a shift-down operation of the shift lever 7 is provided in the shift operation mechanism 6. A control device, preferably an electronic control device 2
0 switches the electromagnetic throttle valve 16 between the fully open position and the throttle position based on the signal of the shift sensor 33;
3 is switched between the connection position and the cutoff position. As shown in FIG. 2, the electromagnetic clutch 13 and the oil pump 15 are disposed in a gear box 19 connected to the rear end of the gear box 18. That is,
The end of the intermediate shaft 12 is supported by an end wall of the gear box 18 by a bearing 21 and protrudes into the gear box 19. An electromagnetic coil 23 is supported on a holding plate 22 fixed to the gear box 19, and a driving plate 22 facing the electromagnetic coil 23 is mounted on the intermediate shaft 12.
a is fixed. Drive plate 22a and conical clutch plate 2
5 and a spring 24 is interposed. The clutch plate 25 is axially movably fitted to the intermediate shaft 12 by a spline 25a, and is engaged with the conical hole 27a of the oil pump 15 by the force of a spring 24. The oil pump 15 includes an internal gear 19a rotatably incorporated in an inner peripheral wall of a gear box 19, and an internal gear 19a.
And the pinion 27 eccentric to the internal gear 19a is supported by the intermediate shaft 12 by a bearing 26 so as to be freely rotatable. The suction port of the oil pump 15 is connected to a strainer 29 provided at the bottom of the gear box 18 via the inlet passage 14 and the pipe 14a. On the other hand, oil pump 1
The discharge port 5 is connected to an oil supply pipe 17a via an outlet passage 17 and an electromagnetic throttle valve 16. Next, the operation of the speed change assist device according to the present invention will be described. During the shift-up operation, the rotation speed of the intermediate shaft 12 or the transmission gear is relatively higher than the rotation speed of the output shaft 10 before the operation. With the output of the electronic control unit 20 based on the signal of the shift sensor 33, the electromagnetic clutch 13 is connected, the electromagnetic throttle valve 16 is throttled, and the intermediate shaft 1
2 to increase the load on the oil pump 15 driven by the oil pump. At this time, since the intermediate shaft 12 does not receive the rotational force of the engine, the rotational speed of the intermediate shaft 12 suddenly decreases, and the rotational speed of the transmission gear meshing with the intermediate gear 39 changes the output shaft 1 receiving the rotational force of the wheels.
It approaches 0 rpm. Thus, the synchronous clutch mechanism 35
The operation burden on the user can be reduced, and a quick and smooth shift-up operation can be obtained. On the other hand, during the downshift operation, the rotation speed of the intermediate shaft 12 or the intermediate gear is relatively lower than the rotation speed of the output shaft 10 before the operation. With the output of the electronic control unit 20 based on the signal of the shift sensor 33, the electromagnetic clutch 13 is shut off and the electromagnetic throttle valve 16 is fully opened. Accordingly, the load on the oil pump 15 is removed from the intermediate shaft 12, and the degree of reduction in the rotational speed of the transmission gear meshing with the intermediate gear 39 is suppressed, while the rotational force is received from the wheels accompanying the inertial running. As the rotation speed of the output shaft 10 approaches the rotation speed of the transmission gear, the operation load on the synchronous clutch mechanism 35 is reduced, and a quick and smooth downshift operation can be obtained. FIG. 3 is a flow chart of a control program for performing the above-mentioned control by the electronic control unit 20 composed of a microcomputer. In FIG. 3, p11 to p20 represent each step of the control program. This control program is p
Starting at 11, the shift start signal of the shift sensor 33 is read at p12. At p13, it is determined whether or not the shift operation is a shift up. If the shift operation is a shift-up operation, the electromagnetic throttle valve 16 is throttled at p14, and the program proceeds to p17. If the shift operation is not a shift up at p13, it is determined at p15 whether the shift operation is a downshift.
If the shift operation is not downshift, the process returns to p12. If the shift operation is downshift, the electromagnetic clutch 13 is shut off at p16. At p17, the shift end signal from the shift sensor 33 is read. At p18, it is determined whether or not the shift operation has been completed. If the shifting operation has not been completed, return to p17,
When the gear shifting operation is completed, the electromagnetic clutch 13 is connected at p19, the electromagnetic throttle valve 16 is fully opened, and the processing ends at p20. As described above, according to the present invention, the load on the oil pump is increased during the shift-up operation to reduce the rotation speed of the intermediate shaft, while the shift-down clutch is shut off during the shift-down operation. Since the load of the oil pump is released from the intermediate shaft, it works to bring the speeds of the transmission gear and the output shaft closer to each other, so that a quick and smooth speed change operation can be obtained, the structure is simple, and the conventional speed change Because it can be mounted on a machine, manufacturing costs can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view showing a schematic configuration of a speed change assist device according to the present invention. FIG. 2 is a side sectional view showing a main part of the speed change assist device. FIG. 3 is a flowchart of a control program for controlling the shift assist device. [Description of Signs] 6: Gearshift operating mechanism 7: Gearshift lever 9: Intermediate gear 1
0: Output shaft 12: Intermediate shaft 13: Disconnection clutch 1
5: Oil pump 16: Throttle valve 17a: Oil supply pipe 18: Gear box 20: Control device 23: Electromagnetic coil 2
5: Clutch plate 27: Pinion 33: Shift sensor
35: Synchronous clutch mechanism 38: Transmission gear 39: Intermediate gear

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16H 59/00-61/12 F16H 61/16-61/24 F16H 63/40-63/48 F16H 57 / 00-57/12

Claims (1)

(57) [Claims] [Claim 1] An oil pump is connected to an intermediate shaft of a gear transmission via a connection / disconnection clutch, and oil in the gear box is passed through a throttle valve by the oil pump and a top wall of the gear box. In a transmission that scatters from a transmission unit to a transmission gear of an output shaft, a transmission operation mechanism is provided with a transmission sensor that detects an operation direction of a transmission lever, and a control device that controls a throttle valve and a connection / disconnection clutch based on a signal from the transmission sensor. A shift assist device, wherein the control device throttles the throttle valve during a shift-up, and shuts off the connection / disconnection clutch during a downshift.