JPH0315383Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention is applicable to mower devices such as reel mowers, rotary mowers, berry mowers, and other seeding machines, transplanters, thinning machines, etc. that require a constant distance from the ground. Regarding the PTO transmission of a tractor equipped with a certain type of work equipment, in particular, the PTO transmission is performed electrically,
A tractor in which the PTO gear ratio is approximately the same as the traveling power gear ratio, and PTO gear shifts are performed automatically according to the gear shift operation of the main transmission or auxiliary transmission.
Regarding PTO transmission.

(b) Prior art Conventionally, there has been published Utility Model Publication No. 57-2750, Utility Model Publication No. 57-
As in Publication No. 20906, the main gear ratio and the PTO gear ratio are made almost the same, and the main gear and PTO gear ratios are controlled manually.
The technology for operating the PTO gear shift in conjunction with the PTO shift was known to the public.

In addition, some mower tractors used variable throttle valves instead of transmissions to change the output of the hydraulic pump in order to match the average number of mowing cycles.

(c) Problems that the invention aims to solve However, when the driving power transmission and the PTO transmission are linked together to enable speed change as described above, there are cases where people forget that they have linked the PTO transmission only because they want to change the speed of the PTO. If the connection is caused by an operation,
As with the high-speed PTO gear, the main gear is also shifted at the same time, which could result in a sudden acceleration at the same time as the shift, or a sudden application of engine braking, resulting in a very dangerous situation. I end up doing it.

In addition, when using a mower tractor equipped with a mower device to match the number of cuts using a variable throttle valve, the more uniform finish precision is required, the more the operator must use the variable throttle valve each time the gear is changed. This required a high degree of skill and skill from the operator.

(d) Means for solving the problems The problems to be solved by the present invention are as described above, and next, the means for solving the problems will be explained.

Traveling gear is changed by rotating the shift lever 10, and PTO gear is changed by rotating the PTO selection switch 24, 25,
26 and 27, when the shift lever 10 is rotated to change the traveling speed, PTO shifting corresponding to the traveling speed is automatically carried out, and
The PTO transmission has PTO selection switches 24, 25,
26 and 27, the gears can be selectively changed even by single operation, and the driving gear is not automatically changed by the single PTO gear shift.

(E) Embodiments and operations The purpose of the present invention is as described above, and the structure and operations of the embodiments shown in the attached drawings will be explained below.

Figure 1 is an overall side view of the mower tractor, Figure 2 is a hydraulic circuit diagram of the present invention, Figure 3 is an electric circuit diagram, Figure 4 is a perspective view of the power shift operating lever, and Figure 5 is an operating diagram. The panel plan view and FIG. 6 are a table showing the relationship between each gear stage.

To explain the overall configuration as shown in Fig. 1, side mowers 1, 1 are protruded left and right from the abdomen between the front wheels 3 and rear wheels 4 of the tractor, and the rear mower 2 is attached to the rear lower link 5. It is configured so that grass, weeds, etc. can be cut.

The vertical movement of the side mower 1 is performed by expanding and contracting a hydraulic cylinder by operating a lever 12, and the vertical movement of the rear mower 2 is performed by rotating a lift arm by operating a lever 13. The side mower 1 and the rear mower 2 are used to cut grass and the like by rotating reels.

In other words, it is more prominent than the transmission case 6.
The seat 9 is powered by a hydraulic pump 8 attached to the PTO shaft.
The hydraulic oil supplied from the rear hydraulic oil tank 7 is converted into pressurized oil and sent under pressure to the hydraulic motors of the side mower 1 and rear mower 2, and the respective reels are rotated to mow the grass and the like.

In this mower tractor, the transmission device of the present invention is an embodiment in which the PTO transmission is not a gear sliding type but a hydraulic clutch and a solenoid valve.

That is, in this transmission system, a hydraulically operated wet multi-disc clutch is placed between each transmission gear and the driving gear, and hydraulic oil sent from a hydraulic pump is sent to the clutch of a desired gear position using a solenoid valve to perform gear changes.

This transmission structure will be explained with reference to the hydraulic circuit shown in FIG. 2. Reference numeral 15 is a manual switching control valve, which is a main transmission device that changes speed by operating a shift lever 10 on the side of the seat. Furthermore, when the shift lever 10 is rotated to the back "R" position,
The control valve 15a is in the switching position, the hydraulic clutch 16a is operated, and the vehicle can move backward. When the shift lever 10 is rotated to the neutral "N" position, the control valve becomes the switching position 15b, and the solenoid valves 18, 19
This allows the work equipment to operate even when it is stopped. Move the shift lever 10 to forward 1st gear "1"
When rotated to position, the control valve is 15c
This is the switching position, and oil is sent to the hydraulic clutch of the PTO transmission via the hydraulic clutch 16b and the solenoid valve 19.

When the shift lever 10 is rotated to the second forward speed "2", the control valve 15d is in the switching position, and the hydraulic clutch 16c and the solenoid valve 1 are switched.
Oil is sent to the hydraulic clutch of the PTO transmission via 9. Hydraulic clutches 16 and 17 are located within the transmission case 6, and 16 connects and disconnects the gear for main transmission of the traveling system, and 17 connects and disconnects the gear for PTO transmission.

17a is for low speed rotation, and 17b is for high speed circuit, which are switched by actuation of solenoids SOL2 and SOL3 of solenoid valve 19. The solenoid valve 18 controls the operation of the working machine when the vehicle is stopped and whether or not to change the PTO speed using the solenoid SOL1.

The electrical control of these solenoids will be explained using the electrical circuit diagram in FIG. First, at the rotating base of the shift lever 10, switches 20, 21, and 22 are provided at machine-side guide positions corresponding to neutral, 1st gear, and 2nd gear, respectively, as shown in the perspective view of Fig. 4. Further, as shown in the plan view of the operation panel in FIG. 5, switches 24 to 27 for selecting PTO shifting are provided below the speedometer 23.

And the central alarm motor (heater 33,
Radiator water temperature 34, oil 35, charge 3
6) are provided with lamps 28 to 32 that indicate the cutting accuracy and the lever position of the main shift.

With such a configuration, when the shift lever 10 is rotated to neutral N, the switch 2 at that position
0 contacts PBN, PBN', PBN'' turn ON, relay R1 operates, lamp 32 lights up, and contact r
1, r1', r1'' are turned ON.

(PBN', PBN'' are safety relay contacts to prevent malfunctions such as those caused by shifting of work equipment, etc. due to the operation of the 1st and 2nd speed relays, etc. Hereafter, PB1', PB1'' , PB2', PB2'' have the same function.) r1 also serves as self-holding, and the contact CSN of the PTO selection switch is interlocked, solenoid SOL1 is activated, and the lamp 37 lights up with "N". The work equipment is in a state when it is not operating and does not travel.

Turn on the second stage switch 25 of the PTO selection switch.
When this occurs, contact CS2 turns ON and relay R is activated.
4 is activated, its contacts r4 and r4' are turned ON, the lamp 28 is lit, and the solenoid SOL3 is activated.
Normal reaping can be done in a stationary state.

When the PTO third stage switch 26 is pressed, its contacts
CS3 turns ON, relay R5 operates and its contact r
5. r5' turns on and precision cutting lamp 29 "Sei"
lights up, solenoid SOL2 is activated, and the PTO is shifted to rotate the reel at high speed for precision finishing.

However, even if the switch 24 is pressed, it will not operate because the break contact r1'' of the relay R1 is ON.

When the shift lever 10 is rotated to the first gear, the contacts PB1, PB1', PB of the switch 21 at that position
1" turns on, lamp 30 lights up, and relay R2
operates, and its contacts r2 and r2' turn ON. r
2 is a self-holding contact.

And the PTO selection switch contacts CS1 and CS2
is interlocked, relay R4 is activated in the same way as above,
The "normal" lamp 28 is turned on, the PTO is automatically shifted to low speed, and normal mowing is performed.

Further, when the third stage 26 of the PTO selection switch is pressed, the relay R5 is activated and precision mowing is performed in the same manner as described above.

When the shift lever 10 is rotated to the second gear, the contacts PB2, PB2', PB of the switch 21 at that position
2" turns ON, lamp 31 lights up, and relay R3
operates, and its contacts r3 and r3' turn ON. r
3 is a self-holding contact.

Then PTO selection switch CS2 or CS3 is ON.
interlocking relay R7 is activated, and its contacts r7, r
7' is turned on, the "Sei" lamp 29 lights up, solenoid SOL3 is activated, and the work equipment rotates at high speed.
Normal mowing is performed due to the high speed rotation during high-speed driving, and when the first stage 24 of the PTO selection switch is turned on, its contact CS1 is turned on, relay R6 is activated, and its contacts r6, r6' turns on and becomes “normal”
The lamp 28 lights up, and the solenoid SOL2 is activated to shift to low speed PTO rotation.

That is, since the running speed is high and the working machine rotates at a low speed, rough cutting work is performed.

The above work can be summarized in a table as shown in Figure 6.

In addition, if the switch provided on the main transmission shift lever is replaced with the shift lever 14 of the width transmission in the same way, the PTO 1st stage will be set in the auxiliary transmission 1st gear, and the PTO 2nd stage will be set in the normal mowing mode and the auxiliary gear position in the auxiliary gear 2nd gear. Shift 1st
The PTO 2nd stage performs precision mowing at high speeds, and the 2nd auxiliary gear allows for precise cutting.
The first stage of the PTO provides rough mowing.The PTO is designed not to rotate when the main gear is in reverse "R" position.

(f) Effects of the invention Since the present invention is constructed as described above, it has the following effects.

First, with the simple push of a button switch, automatic PTO gear shifting can now be performed by operating the main or auxiliary gear shift lever, allowing mowing to match the driving speed.

Second, even when the traveling speed is set to a certain speed,
Since it is possible to change the PTO rotation speed to the desired value,
This allows the operator to obtain the desired rotational speed of the work machine.

Thirdly, even when PTO shifting is performed alone,
Since the traveling gear does not follow this, it is possible to engage the main clutch and suddenly start without realizing that the PTO gear is set to a high speed and the travel gear is also followed by a high speed. This eliminates the inconvenience of being left behind.

Fourth, since the PTO gear can be changed even when the travel gear is set to neutral, there is no uneven cutting at the beginning or end of the cutting, which improves the aesthetic appearance.

[Brief explanation of the drawing]

Figure 1 is an overall side view of the mower tractor, Figure 2 is a hydraulic circuit diagram of the present invention, Figure 3 is an electric circuit diagram, Figure 4 is a perspective view of the power shift operating lever, and Figure 5 is an operating diagram. The panel plan view and FIG. 6 are a table showing the relationship between each gear stage. 10...Shift lever, 17...Hydraulic clutch, 1
8,19...Solenoid valve.

Claims (1)

[Scope of utility model registration request] Traveling gear is changed by rotating the shift lever 10, and PTO gear is changed by rotating the PTO selection switch 24, 25,
26 and 27, when the shift lever 10 is rotated to change the traveling speed, PTO shifting corresponding to the traveling speed is automatically carried out, and
The PTO transmission has PTO selection switches 24, 25,
A PTO for a tractor, characterized in that the PTO of the tractor is configured such that the gear can be selectively changed independently by the operation of 26 and 27, and the driving gear is not automatically changed by the single PTO gear shift. gearbox.