JPH0114555Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a back-tillage check device in a tillage transmission section of a tiller.

That is, a shifter shaft that is moved up and down between high and low speeds and a neutral position by a tillage speed change lever is installed and configured so that it can be rotated by a clutch plate fixed to the shifter shaft to switch the tillage between high and low speeds and neutral position. In the tilling gear section of the tiller, when the machine is moving forward to perform tilling work, when the machine is stopped and the machine is moved backwards by operating the main gear shift lever, even if the tiller gear lever is not operated. It is possible to stop the tillage automatically and back up safely, and when the machine is to move forward again from that state, the tillage is automatically engaged as the machine moves forward without operating the tillage gear shift lever. To provide a machine that can be easily operated without having to operate a tilling speed change lever each time when performing tilling work by repeatedly moving forward and backward, and can be carried out suitably.

Next, the embodiment shown in the drawings will be described.

Fig. 1 shows a side sectional view of a part of the tiller, and the transmission case M, which supports wheels on both sides of the lower part, has an input shaft 6 that can receive input from the engine and transmit it to the axle via a gear group 5. A high-speed gear 8 and a low-speed gear 9, which are always engaged with the input shaft 6 side, are loosely fitted to an intermediate shaft 7 which is mounted above the input shaft 6, and a pawl clutch is spline-fitted to the intermediate shaft 7. 1
gears 12, 0 are installed so that they can be selectively engaged with both gears 8 and 9, and gears 12,
13 so that the power can be transmitted from the transmission shaft 11 to the tilling section at the rear of the machine body, and is constructed in the same manner as the conventional structure.

An operating frame 14 is extended rearward from the upper part of the mission case M, and the operating frame 14
An E-shaped guide groove 16 is formed in the guide plate 15 attached to the rear end, and when the main shift lever 4 inserted into the guide groove 16 is moved to the left of the center, it can be placed in the neutral and each forward groove. It is installed so that when it is moved to the right side, it can be placed in each of the reverse grooves to allow forward and backward operation of the aircraft, and can be locked at each position by the tension of a spring 17, so that it has the same structure as the conventional structure.

The shifter shaft 2, which is fitted into the upper part of the transmission case M so as to be vertically movable, has three engagement grooves 18 formed in the middle, and locking balls 19 are installed so that they can be engaged with each other. A middle part of a speed change shifter 20 in an orthogonal direction is fixed to the lower end of the
The upper part of the transmission fork 22, which can be fitted into the support shaft 21 and moved and which engages the pawl clutch 10, has a high engagement recess 22a and a low engagement recess in which one end 20a and the other end 20b of the transmission shifter 20 are engaged, respectively. 22b are formed on both sides, and in the neutral position, the one end 20a and the other end 20b are installed so as to remain engaged with the engaging recesses 22a and 22b, respectively, as shown in FIG.

Further, the middle part of the clutch plate 3 that is perpendicular to the upper end of the shifter shaft 2 is fixed by a bolt 23, and the one end 3a side of the clutch plate 3 abuts on a support plate 24 that is erected laterally on the one end 3a side. A tension spring 26 is connected between one end 3a of the adjuster star 25 and the support plate 24 to rotate the clutch plate 3 toward the clutch engagement side, and is integrally attached to the upper part of the shifter shaft 2. The distal end of the tillage speed change lever 1, which is pivoted 29 on a support piece 28, is engaged with the fixed engagement fitting 27, and the tillage speed change lever extends upward from the operation frame 14 in the same direction as the main speed change lever 4. 1 is inserted into the vertical guide groove 31 in the rear support plate 30, and the tilling gear lever 1 is moved vertically to move the shifter shaft 2 up and down, and the tilling gear can be operated between neutral and high/low speeds. Set and configure.

A backstop device A is interposed between the clutch plate 3 and the main shift lever 4, and the device A has a vertical support shaft 32 rotatably mounted on the upper surface of the operating frame 14. At both upper and lower ends of the support shaft 32, arms 3 extend at right angles in plan view.
4 and 33 are fixed together to form a bell crank shape, and a pin 35 that can come into contact with the right side of the main gear shift lever 4 is vertically provided at the tip of the lower arm 34. Upper arm 3
A link 37 is connected between a pin 36 projecting upward from the tip of the clutch plate 3 and the other end 3b of the clutch plate 3.

Therefore, by operating the main gear shift lever 4 along the guide groove 16, the machine can be moved forward or backward, and when the tillage gear shift lever 1 is positioned in the middle in the vertical direction, the shifter shaft 2 can be moved vertically. At the intermediate position, the locking ball 19 engages with the middle part of the engagement groove 18, and both ends of the shifter 20 engage with the engagement recesses 22a and 22b of the shift fork 22, respectively, as shown in FIG. state, and the power transmission to the tilling section becomes neutral.

When the tilling speed change lever 1 is lifted and put into a low speed position as shown by A in FIG. 1, the locking ball 19 engages with the upper part of the engagement groove 18 and the shifter shaft 2 is lowered as shown in FIG. The other end 20b of the speed change shifter 20 engages with the engagement recess 22b of the speed change fork 22, and the shifter shaft 2 is rotated by the tensile force of the tension spring 26 to move the speed change fork 22 to one side and engage the pawl clutch 10. Move it to the low speed side,
This means that low-speed power can be transmitted to the tilling section.

Further, when the tillage gear lever 1 is lowered and placed in the position shown by B in FIG. 1, the shifter shaft 2 rises, and as shown in FIG. As the shifter shaft 2 rotates, the speed change fork 22 moves to the other side, and the pawl clutch 10 engages on the high speed side, resulting in high speed transmission to the tilling section.

In this way, as shown in Fig. 5, with the clutch plate 3 rotated and the tilling transmission set to high or low speed, the main shift lever 4 is moved from the middle to the left side as shown by arrow C. When the machine is shifted to the forward side, the main gear shift lever 4 does not hit the pin 35 of the backstop device A, and the backstop device A remains inactive, so that the machine can perform tilling work while moving forward. I will do it.

During such work, when changing the direction of the aircraft, or when stopping the aircraft and moving it backwards, move the main gear shift lever 4 into the guide groove 1.
The main shift lever 4 pushes the pin 35 of the backstop device A as shown in Fig. 7. The arms 34 and 33 rotate at the same time, pushing the link 37, tensioning the tension spring 26 and rotating the clutch plate 3, which rotates the shifter shaft 2 and releases the pawl. The clutch 10 will be operated in the clutch-off position, and the tilling section will be automatically stopped while the machine is in a backwards state.

In that state, the tillage gear shift lever 1 remains at the tillage gear shift position, and the shifter shaft 2
can only be rotated but not moved up or down.

In this way, when the machine moves backward and then moves forward again to start tilling, the main gear lever 4 is put into the forward groove, but the main gear lever 4 moves away from the pin 35. That is,
When operated in the direction indicated by the arrow C in FIG. 5, the external force on the backstop device A is released, and the tension spring 26
The clutch plate 3 is rotated by the tensile force of the clutch plate 3, and the shifter shaft 2 is rotated, so that the tilling transmission is performed again as it was in the original state, and the tilling work is automatically restarted without performing a tilling speed change operation. will be done.

In this way, the present invention is configured so that the shifter shaft, which is moved up and down between high and low speeds and neutral positions by the engine speed change lever, is rotated by a clutch plate fixed to the shifter shaft, and can be operated to switch between high, low and neutral tillage speeds. In the tillage transmission section of the tiller, a tension spring is provided to press the clutch plate toward the clutch "on" side, and the main gear shift lever is provided between the main gear shift lever that operates the machine body forward and backward and the clutch plate. A backstop device is installed that maintains the clutch plate in an inactive state when the gearbox is operated in the forward direction, and turns the clutch plate ``off'' when the gearbox is operated in the reverse direction. Since the configuration is such that the operation from the reverse side to the forward side is automatically reversed, even if the machine is moving forward to perform tilling work, you can stop the machine once and operate the main gear shift lever. When moving the machine backwards, the backstop device automatically stops tilling without operating the tillage gear lever, allowing the machine to back up in a safe state. , the tillage can be automatically engaged as the machine moves forward without operating the tillage speed change lever, and when performing tillage work by repeatedly moving forward and backward, it is not necessary to operate the tillage speed change lever each time. It has the advantage of being able to be easily maneuvered without any hassle and being able to be carried out suitably.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a side sectional view of a part of the tiller, FIG. 2 is a sectional view of a part of the transmission case, FIG. 3 is a side sectional view of the main parts, and 4
The figure is a plan view of a part of Fig. 3, Fig. 5 is a plan view of a part of Fig. 1, Fig. 6 is a front view of the guide plate, Fig. 7 is an explanatory diagram of the operation of Fig. 9 and 9 are operation explanatory diagrams showing a part of FIG. 3. 1...Tilling speed change lever, 2...Shifter shaft,
3...Clutch plate, 4...Main gear shift lever, A...
Back stopper device, 26...tension spring.

Claims (1)

[Scope of utility model registration request] A tiller comprising a shifter shaft 2 which is moved up and down between high and low speeds and a neutral position by a tillage speed change lever 1, and can be rotated by a clutch plate 3 fixed to the shifter shaft 2 to switch between high and low speeds and neutral tillage. A tension spring 26 is provided to press the clutch plate 3 toward the clutch "on" side, and a tension spring 26 is provided in the tilling gear shift section of the tiller, and a tension spring 26 is provided between the main gear shift lever 4, which operates the machine forward and backward, and the clutch plate 3. A backstop device A is installed to keep the clutch plate 3 inactive when the lever 4 is operated in the forward direction, and to turn the clutch plate 3 to "off" when the lever 4 is operated in the reverse direction. A back-tillage check device in a tillage transmission section of a tiller, characterized in that device A is configured to automatically move back when a main speed change lever 4 is operated from the reverse side to the forward side.