JPS61189349A - Operating parts of power transmission - Google Patents

Abstract

PURPOSE:To enable gear from being changed to another with little creation of shock throughout gear shift operation by setting power transmitting time as to be according to the demanded oil supply with an inching valve inoperational. CONSTITUTION:There is provided a proportional valve controller 31 which controls a proportional valve V2 and there are also provided a primary sensor 43 which detects gear speed position by an operating valve V1, and a secondary sensor 33 which detects power transmission cut-off operation with respect to the inching valve V3. Based on information from both the sensors 32 and 33, with the inching valve V3 inoperational, the proportional valve V2 is adjusted for opening as that the modulation function which has a vehicle start at a slow speed may be optimum in each of gear positions. Comfortable and safety speed change without giving a shock to a driver can be accomplished quickly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an operating section for a power transmission in which a gear shift operating valve and a clutch operating inching valve for the power transmission are connected to a hydraulic pump.

[Conventional technology]

Conventionally, in the operation section of the power transmission mentioned above, -
A modulation valve that transmits power while gradually increasing hydraulic pressure so that the gear can be changed without shocking the operator regardless of the gear position by the shift operation valve when the inching valve is not operated is installed between the shift operation valve and the hydraulic pump. It was placed between.

[Problem that the invention seeks to solve]

However, the amount of supplied oil required for each gear may differ, and in this case, the modulation valve is generally installed at the gear that requires the least amount of supplied oil so that shock-free shifting can be performed at all gears. Pressure increase characteristics must be matched, and especially in gears that require a large amount of oil to be supplied, there is a risk that the modulation valve will take unnecessary transmission time, making it difficult to start and reducing work efficiency. Ta.

Therefore, in order to eliminate the above-mentioned drawbacks, if a throttle valve is provided for each gear stage and the transmission time is adjusted respectively, then when the inching valve is operated, the pressure oil supply becomes obstructed, making it impossible to perform a rapid start. There was a risk that work such as pushing the tip of the shovel into the soil would not be possible.

The purpose of the present invention is to enable quick gear changes without causing a shock to the operator when the inching valve is not operated, even if there is a gear stage that requires a particularly large amount of oil to be supplied, and furthermore, when the inching valve is operated, the gear stage can be changed quickly. The aim is to enable rapid start-up regardless of the situation.

[Means for solving problems]

A characteristic configuration of the operating section of the power transmission of the present invention is that an electromagnetic proportional valve that can freely adjust the hydraulic pressure of oil supplied by the hydraulic pump is provided between the speed change operation valve and the hydraulic pump, and a proportional proportional valve that controls the proportional valve. A valve controller is provided, and a first detector for detecting a gear position by the shift operation valve and a second detector for detecting a transmission cut operation for the inching valve are provided, and based on information from both the detectors, the When the inching valve is not operated, the opening of the proportional valve is adjusted so that the transmission time at each gear of the speed change operation valve becomes the set transmission time,
In addition, a control device is provided that sets the proportional valve to a large opening so as to shorten the transmission time regardless of the gear position when the inching valve is operated, and its effects are as follows. .

[For production]

In other words, as shown in the flowchart in Figure 2, when the inching valve is not operated, the transmission time is set in accordance with the amount of oil supplied to each gear, thereby reducing the transmission time in all gears. By setting the system so that gears can be shifted quickly with little shock without applying power, and when operating the inching valve, transmission is performed in a short time regardless of the gear position, allowing for a sudden start, the tip of the excavator plunges into the soil. You will be able to do similar tasks.

〔Effect of the invention〕

Therefore, it is possible to quickly shift gears comfortably and safely without causing a shock to the operator without taking unnecessary time. Moreover, since a sudden start operation by operating the inching valve can be performed regardless of the gear position, the power The workability and efficiency of the entire device including the transmission could be improved.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 3, a front vehicle body (2) equipped with a pair of left and right front wheels (1) and a rear vehicle body (4) equipped with a pair of left and right rear wheels (3) are connected to the center of the vertical axis. (X), and is equipped with a front loader (5) that can be freely raised and lowered on the front body (2), and a riding section (6) and a driving section on the rear body (4). (7), and backhoe equipment (
8), and both front and rear vehicle bodies (2), (4)
A hydraulic cylinder (9) installed across the vehicle body is configured to relatively drive and sway both the front and rear vehicle bodies (2) and (4) by an amount corresponding to the amount of operation of the steering handle (6a) to perform vehicle direction. At the same time, a driving transmission case (1) is connected to the engine (10) in the driving part (7).
The earthmoving vehicle is configured to transmit the variable speed power from 1) to the front wheels (1) and the rear wheels (3), respectively, and thereby performs earth-moving work and excavation work.

As shown in FIGS. 1 and 4, the transmission structure in the traveling transmission case (11) includes an input shaft (12), a first intermediate shaft (13), and a second intermediate shaft. (14) are arranged concentrically, and the reverse cylinder shaft (15) is attached to the first intermediate shaft (13), and the output cylinder shaft (16) is relatively rotatable to the second intermediate shaft (14). Attach the disk-shaped members (17a) and (17b) to both ends of the spider (17).
) are respectively attached to the double cylinder shafts (15) and (16) so that they can rotate freely relative to each other, and the input shaft (12) and the first intermediate shaft (13)
between the input shaft (
12) and the reverse cylinder shaft (15), and a third multi-plate type transmission clutch (19) between the second intermediate shaft (14) and the output cylinder shaft (16). Transmission clutches (20) are provided, and the first and second gears (GO, (G) are respectively attached to the first and second intermediate gears (13) and (14), and the third and fourth gears are in constant engagement with each other. Gears (Gz) and (G4) are attached to the spider (17) so that they can rotate freely, and the double cylinder shaft (15)
, 5th and 6th gears (Gs
), (GA), and the 7th and 8th gears (cz) and (G4.), respectively.
Gears (G?) and (Gs) are attached to the spider (17) so that they can rotate freely, and the reverse cylinder shaft (15) is attached to the case (11).
) multi-disc type first brake (21), third
A multi-plate second brake (22) for fixing the internal gear (GF) that constantly engages the gear (G3) to the case (11).
, and a multi-plate third brake (23) for fixing the second intermediate shaft (14) to the case (11), and further,
The input shaft (12) is connected to the engine (10) through a running latch (24) and a gear interlocking mechanism, and the output cylinder shaft (16) is connected to the front and rear wheels (1) through the gear interlocking mechanism.
, (3) is interlocked and connected to the output shaft (25).

A hydraulic pump (P) is connected to a hydraulic cylinder section (188-23a) for clutch operation which is attached to each transmission clutch (18-23) in a state where it is always biased toward the transmission disengaged state.
A clutch operation inching valve (Vl) that performs a relief operation based on the depression operation of the inching pedal (30) and a gear shift operation pulp (Vl) that selectively supplies pressure oil from the inching pedal (30).
V3), which can be freely switched between 5 forward speeds (Fl to F3), 2 reverse speeds (R+, Ih), and a neutral shift state B (N), forming a power transmission as a whole. are doing.

Then, the speed change operation valve (Vl) and the hydraulic pump (P
) is provided with an electromagnetic proportional valve (V2) that can freely adjust the hydraulic pressure of oil supplied by a hydraulic pump (P), and a proportional valve controller (3) that controls the proportional valve (V2).
1), a first detector (32) for detecting the gear position by the gear shift operation valve (L), and an inching valve (V
A second detector (33
), and based on the information from both the detectors (32) and (33), when the inching valve (lh) is not operated, the transmission time at each gear of the shift operation valve (V3) is set to the set transmission time. The proportional valve (Vg
), and when the inching valve (V3) is in operation, the proportional valve (V2) is set to a large opening so that the transmission time is shortened and a sudden start is performed regardless of the gear position. A control device (34) consisting of the following is provided.

Note that (D) in the figure is a drain tank.

[Another example]

The operating section provided with the control device (34), inching valve (V2), etc. can be used not only for earthmoving vehicles but also for any working vehicle.

In addition to the relief valve, the inching valve (V3) for clutch operation that is linked to the depression operation of the inching pedal (30) does not supply pressurized oil from the hydraulic pump (P) to the speed change operation valve (V+), and is connected to the drain tank. It may be a switching pulp that is switched and supplied to (D), or it may be another pulp.

[Brief explanation of drawings]

The drawings show an embodiment of the operating section of the power transmission according to the present invention, in which Fig. 1 is a hydraulic circuit diagram, Fig. 2 is a flowchart, Fig. 3 is a side view of the earthmoving vehicle, and Fig. 4 is a schematic diagram of the speed change operating device. It is a diagram. (31) Proportional valve controller, (32)
...First detector, (33)...Second detector, (34)...Control device, (P)...
・Hydraulic pump, (V+)... Speed control valve,
(V2)...Solenoid proportional valve, (V3)...
...Inching valve.

Claims (1)

[Claims] Shift operation valve (V) for power transmission
_1) and a clutch operating inch valve (V_3) are connected to a hydraulic pump (P), and the power transmission operating part is connected between the speed change operation valve (V_1) and the hydraulic pump (P), and the An electromagnetic proportional valve (V_2) that can freely adjust the hydraulic pressure of oil supplied by the hydraulic pump (P) is provided, and a proportional valve controller (31) that controls the proportional valve (V_2) is provided, and the speed change operation valve (V_1) A first detector (32) that detects the gear position
, and a second detector (33) for detecting a transmission cut operation for the inching valve (V_3), and based on information from both the detectors (32) and (33), the inching valve (V_3) In the non-operating state, the opening of the proportional valve (V_2) is adjusted so that the transmission time at each gear of the speed change operation valve (V_1) becomes the set transmission time, and the operating state of the inching valve (V_3) is adjusted. Here, a control device (34) sets the proportional valve (V_2) to a large opening so as to shorten the transmission time regardless of the gear position.
The power transmission control section is equipped with a