JPH11189172A - Variable speed steering - Google Patents

Abstract

(57) [Summary] [PROBLEMS] When the vehicle is stopped, when the engine is idling, or when performing another work using the power of the engine, the hydraulic pump for gear shifting steering is stopped to stop the power of the engine. By not wasting as much as necessary, it helps to save energy and reduces noise during work due to noise and vibration generated from the hydraulic pump, thereby reducing the effect on the work environment. SOLUTION: In a speed change steering device configured such that the drive speed and drive direction of left and right output shafts can be adjusted, a transmission PTO having a clutch on a transmission 2e.
2f, transmission PTO2 with clutch
f, the hydraulic pump 3 is connected, and the rotational power from the engine 1 is appropriately transmitted to the hydraulic pump 3 by a clutch.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed change steering apparatus for a vehicle having a pair of right and left crawler running means, such as a combine and a bulldozer.

[0002]

2. Description of the Related Art Conventionally, as this type of speed change steering device,
As shown in FIG. 2, power of the engine 1 and the like is transmitted to the shaft 5, the bevel gears 6a and 6b, and the planetary gear mechanisms 8A and 8B via the transmission 2 as straight-line power.
The hydraulic pressure from the hydraulic pump 3 driven by the engine 1 is supplied to the hydraulic motor 15 via the operation valve 14, and the rotational power from the hydraulic motor 15 and the linear power from the transmission 2 are transmitted by the planetary gear mechanisms 8A and 8B. There is a differential mechanism in which the speed is changed by giving a rotational speed difference to the left and right output shafts 13a and 13b.

[0003]

In the above-mentioned prior art, the hydraulic pump for supplying the hydraulic pressure to the hydraulic motor is driven to rotate from a power source such as an engine via a transmission. Directly connected and driven to rotate, so even when the vehicle is stopped, the engine is idling, when using the power from the engine to do other work, or when the engine is started In addition, the hydraulic pump is constantly rotating, and the power of the engine is wasted wastefully, and it is said that the noise and vibration generated from the hydraulic pump should be reduced during work to reduce the influence on the working environment. There's a problem.

[0004] Therefore, the present invention provides a gear shift steering system in which the engine is idling while the vehicle is stopped, another work is performed using the power of the engine, or the engine is started. Stopping the hydraulic pump to prevent unnecessary waste of engine power, contributing to energy savings and reducing noise during work due to noise and vibration generated by the hydraulic pump, thereby reducing the impact on the work environment. With the goal.

[0005]

According to the first aspect of the present invention, the power from the mechanical drive means for traveling straight which comprises a transmission for transmitting the output of the engine is transmitted to the output shaft via the left and right planetary gear mechanisms. Power from a hydraulic drive unit comprising a hydraulic pump, a hydraulic motor, and a valve driven by an engine is transmitted to the planetary gear mechanism so as to impart rotation to the planetary gear mechanism. A transmission PTO with a clutch is disposed in a transmission, and a transmission PTO with a clutch is provided in the speed change steering device in which the output from the hydraulic drive unit for driving is combined so that the driving speed and driving direction of the left and right output shafts can be adjusted. The hydraulic pump is connected to the PTO, and the rotational power from the engine is appropriately transmitted to the hydraulic pump by a clutch.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same components as those of the conventional example will be denoted by the same names and symbols.

In the transmission steering apparatus according to this embodiment, as shown in FIG. 1, reference numeral 1 denotes a prime mover such as an engine, and an output side of the prime mover 1 includes a main clutch 4a,
Transfer 2a, mission 2b, transfer 2
c, shaft 5a, transfer 2d, sub-clutch 4
b and the shaft 5b are connected to each other, and constitute mechanical drive means M for directly transmitting the rotational power from the engine 1.

A bevel gear 6a is attached to the shaft 5b, and the bevel gear 6a meshes with the bevel gear 6b.

The bevel gear 6b is connected to the sun shaft 7, and the sun shaft 7 is joined to the bracelets 9a and 9b of the first and second planetary gear mechanisms 8A and 8B.

[0010] Planetary gears 10a and 10b are rotatably supported on the bracelets 9a and 9b, respectively.

The planetary gears 10a and 10b are coaxially fitted with the sun gears 11a and 11b on the sun shaft 7 and the ring gear 1a.
2a and 12b, respectively, and rotate.

The output shaft 1 is attached to the ring gears 12a and 12b.
The output shafts 13a and 13b are engaged with a crawler (not shown) so that the rotational power from the engine 1 is directly transmitted.

The hydraulic pump 3 is connected to a transmission PTO 2f with a clutch of a transmission 2e disposed on the transmission 2b, and is driven to rotate by the rotational power from the engine 1 by operating a clutch (not shown). Side is connected to the tank T and the discharge side is connected to the control valve 14.

The control valve 14 has a manual four-port (a,
b, c, d) Open-center type control valve at three positions (A, B, C).

The upstream port a of the control valve 14 is connected to the discharge main pipe 20a of the hydraulic pump 3, and the port b is connected to the tank T.

The downstream ports c and d of the control valve 14 are connected to a hydraulic motor 15, and the hydraulic pump 3 and the control valve 1
4. The hydraulic drive means P is constituted by the hydraulic motor 15.

The transmission gear 1 is mounted on a shaft 16 of the hydraulic motor 15.
7a and 17b are connected and a brake 18 is provided.

The transmission gear 17a meshes with the sun gear 11a via the gear 19, and the transmission gear 17b meshes with the sun gear 11b.
b also meshes with the planetary gears 10a and 10b.

The brake 18 is adapted to brake the rotation of the hydraulic motor 15 by an actuator (not shown).

The transfer 2a, 2c, 2d is provided with a full power PTO 2g and a transmission PTO 2h, respectively, so that the rotational power from the engine 1 can be used for other work equipment.

Next, the operation will be described. If the vehicle (not shown) is in a stopped state, the main clutch 4
a, the sub-clutch 4b is disengaged, the rotational power from the engine 1 is not transmitted to the transmission 2b, the hydraulic pump 3 stops rotating, and the hydraulic motor 15
The hydraulic motor 1 is driven by a brake 18 provided on
5 has rotation stopped.

Next, when the vehicle travels straight, the main clutch 4a and the sub-clutch 4b, which have been disconnected in the stop state, are gradually connected, and the rotational power from the engine 1 is applied to the main clutch 4a, the transfer 2a, The transmission is transmitted to the transmission 2b, the transfer 2c, the shaft 5a, the transfer 2d, the sub clutch 4b, the shaft 5b, the bevel gears 6a and 6b, the sun shaft 7, the planetary gear mechanisms 8A and 8B, and the output shafts 13a and 13b to drive a crawler (not shown). Thus, the vehicle can travel straight.

When the vehicle is turned, the hydraulic motor 15 is used to operate the control valve 14 to turn the vehicle.
When the brake 18 provided on the shaft 16 is released and the control valve 14 is switched to the position A or the position B, the hydraulic pump 3
Pressure oil is supplied to the hydraulic motor 15, and the hydraulic motor 15 is rotated at a flow rate corresponding to the operation amount of the control valve 14, and the planetary gears 10a, 10b are driven via the gears 17a, 17b, 19 and the sun gears 11a, 11b. And the rotation of the output shafts 13a and 13b is caused by the direct rotation power from the engine 1 and the rotation from the hydraulic motor 15, so that the vehicle is controlled by the position A or the position B of the control valve 14. You can steer to the left or right.

Therefore, when the vehicle is stopped at a predetermined position and brought into an idling state, the main clutch 4 is disengaged, the power from the engine 1 is cut off, the hydraulic pump 3 stops rotating and the hydraulic motor 15 By operating the brake 18 provided on the shaft 16 by an actuator (not shown) to brake the rotation of the hydraulic motor 15, the output shafts 13a and 13b do not rotate, and the vehicle is stopped in an idling state.

Next, when performing another operation while the vehicle is stopped, the main clutch 4a is connected and the sub-clutch 4b
, The rotational power from the engine 1 is transmitted to the main clutch 4a, the transfer 2a, the transmission 2b, the transfer 2c, the shaft 5a, and the transfer 2d.

On the other hand, when the clutch of the transmission PTO 2f provided with the clutch provided in the transmission 2b is disengaged, the rotational power from the engine 1 is not transmitted to the hydraulic pump 3, the rotation of the hydraulic pump 3 is stopped, and the control valve 14 is set to the neutral position. By switching to the position C, the hydraulic motor 15
Is connected to the center open, is in a floating state, and the brake 18 is actuated by an actuator (not shown).
Various work equipment can be operated using the rotational power from each full power PTO 2g or the transmission PTO 2h to perform work.

Thus, the left and right output shafts 13a, 13b
The transmission 2e is provided with a transmission PTO2f with a clutch, and the hydraulic pump 3 is connected to the transmission PTO2f with a clutch.
Since the rotational power from the engine 1 is appropriately transmitted to the hydraulic pump 3 by the clutch, the engine 1 is kept in an idling state when the vehicle is stopped and it is not necessary to perform the shift steering, The hydraulic pump 3 can always be stopped even when another operation is performed using the power or the engine 1 is started, so that the power of the engine 1 is not wasted. ,
In addition, noise and vibration from the hydraulic pump 3 are not generated, which can help reduce noise in the working environment.

[0028]

According to the first aspect of the present invention, a transmission PTO with a clutch is provided in a transmission in a speed change steering apparatus configured to be able to adjust the driving speed and driving direction of the left and right output shafts. The hydraulic pump is connected to the hydraulic pump, and the rotational power from the engine is appropriately transmitted to the hydraulic pump by the clutch. Therefore, when the vehicle is stopped and it is not necessary to perform the shift steering, the engine is set to the idling state. The engine is running, doing other work using the power of the engine, or even when the engine is started, the hydraulic pump always stops, so that the power of the engine is not wasted and In addition, no noise or vibration is generated from the hydraulic pump, which is effective in reducing noise in the working environment.

[Brief description of the drawings]

FIG. 1 is a hydraulic circuit diagram of a speed change steering device showing an embodiment of the present invention.

FIG. 2 is a hydraulic circuit diagram of a speed change steering device showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Engine 2a, 2c, 2d Transfer 2b Transmission 2e Transmission 2f Transmission P with clutch
TO 2g Full power PTO 3 Hydraulic pump 4a Main clutch 4b Sub-clutch 5a, 5b Shaft 6a, 6b Bevel gear 7 Sun shaft 8A, 8B Planetary gear mechanism 9a, 9b Arm ring 10a, 10b Planetary gear 11a, 11b Sun gear 12a, 12b Ring gear 13a, 13b Output shaft 14 Control valve 15 Hydraulic motor 16 Shaft 17a, 17b Transmission gear 18 Brake 19 Gear 20a Main pipeline M Mechanical drive means P Hydraulic drive means T Tank

Claims (1)

[Claims] 1. A system for transmitting power from a mechanical drive means for straight traveling comprising a transmission for transmitting the output of an engine to an output shaft via left and right planetary gear mechanisms, and a hydraulic pressure driven by the engine. The power from the hydraulic drive unit including the pump, the hydraulic motor, and the valve is transmitted so as to impart rotation to the planetary gear mechanism, and the outputs of the straight traveling mechanical drive unit and the turning hydraulic drive unit are output. In a speed change steering device that is configured to be able to adjust the drive speed and drive direction of an output shaft, a transmission PTO with a clutch is provided in the transmission, the hydraulic pump is connected to the transmission PTO with a clutch, and a transmission from the engine is provided. A variable speed steering device characterized in that rotational power is appropriately transmitted to a hydraulic pump by a clutch. .