JP3065136B2 - Transmission of snowplow - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a snow blower operated by a transmission having a hydraulic stepless speed change mechanism.

[0002]

2. Description of the Related Art The vehicle speed of a snowplow is required to be very low (3 to 4 km / h) for movement, from very low speed for snow removal work.
For this reason, there is a type that employs a transmission having a hydraulic continuously variable transmission mechanism, and the characteristics of the hydraulic continuously variable transmission mechanism, that is, where a variation is likely to occur at a low speed region with reference to a high speed region. Therefore, in many cases, a sub-transmission means for switching between high speed (for movement) and low speed (for work) is provided. Therefore, two speed control (main speed) and sub speed change are used.
It requires two gearshift levers, which complicates the operation. In order to solve this problem, there is a type in which one shift lever can switch between a high speed for movement and a low speed for work. Shift guide hole C of shift lever B in that case
Was H-shaped as shown in FIG.

[0003]

As described above, if the shift guide hole C of one shift lever B is H-shaped,
When the guide hole C communicates straight from forward to reverse, and when the shift lever B is returned from the forward position to the neutral N position to stop the forward movement of the body, it quickly passes through the neutral N position to the reverse position. It is dangerous to shift and the aircraft will move backward. The present invention has been made to solve the above problems.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a transmission 5 having a hydraulic continuously variable transmission mechanism.
In the snow blower 1 that is operated to change gears, the transmission 5 performs the gear change operation using one operation lever 6a, and the shift guide hole 9 of the operation lever 6a is used.
Is composed of a first guide hole 9a, a second guide hole 9b, and a third guide hole 9c, and is movable in the left-right direction between the first guide hole 9a and the second guide hole 9b. A neutral N zone is provided and formed in a Y-shape.
a, it is possible to switch to a forward shift, a second forward shift to the second guide hole 9b, and a reverse shift to the third guide hole 9c, and the operation lever 6 in the third guide hole 9c.
a is rotated left and right in the neutral N zone to switch the sub-shift lever 21 to the high-speed side or the low-speed side, and then to shift while using both high-speed and low-speed.

[0005]

With the above arrangement, the transmission of the snowplow according to the present invention has a stop zone which stops at the neutral position between the three guide holes of high speed forward, low speed forward, and reverse. In other words, the operation lever does not move straight from the forward position to the reverse position or from the reverse position to the forward position, so that safety in the operation of the vehicle traveling is ensured. In addition, when the operation lever is rotated left and right in the neutral position to switch the sub-transmission lever to the high-speed side or the low-speed side, and then the shift is performed by combining the high speed and the low speed, the reverse traveling is performed safely.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the accompanying drawings. In FIG. 6, reference numeral 1 denotes a walking type snow plow, which is equipped with a crawler 3 on a lower side of a base 2 and an engine 4 on the base 2.
A transmission (transmission) 5 having a hydraulic stepless transmission mechanism (not shown) is mounted behind the engine 4.
An operation unit 6 is provided on the upper side. The operating section 6 is provided with a shift lever 6a for performing a shift operation of the transmission 5. An auger 7 and a snow throwing chute 8 are provided on the front side of the base 2 so that the snow removal work is performed together with the forward running of the body.

A shift guide hole 9 for operating the shift lever 6a is formed in a Y-shape as shown in FIG. 1, and the three guide holes are used for high-speed advance (movement) 9a.
The shift can be switched between a low speed forward (snow removal) 9b and a reverse 9c, and the reverse guide 9c has both high speed and low speed. And three guide holes 9a
9c, a stop zone in which the movement of the shift lever 6a stops at the neutral N position is formed. Accordingly, the shift lever 6a is moved from the forward position 9a, 9b to the reverse position 9c, or from the reverse position 9c to the forward position 9a, 9b.
It cannot be moved straight.

As shown in FIG. 2, the speed change operation section operated by the speed change lever 6a is composed of a pair of rotation support frames 1.
At 0 and 10, a fork portion provided at the lower end of the speed change lever 6a is supported by a pivot shaft 12 so as to be rotatable in the left and right direction with respect to a speed changeover portion 11 rotatably supported in the front and rear direction.
Both ends of the speed changeover section 11 and the rotation support frames 10, 1
0, the speed changeover unit 11 is inserted with the friction plates 13
Gives resistance to the rotation of. A base end portion of the operation arm 14 is fixed to a lower portion of the shift lever 6a and projects laterally.
A long hole 15a of the play guide member 15 shown in FIG. The play guide member 15 is fixed to one end of a link arm 16, and the other end of the link arm 16 is pivotally connected via a pin 16 a to a triangular link plate 17 pivotally supported by a shaft 18. One end of a link arm 19 is pivotally connected to the link plate 17 via a pin 19a, and a speed change guide 20 formed of an oblong ring is fixed to the other end of the link arm 19. In the ring of the speed change guide 20, an auxiliary speed change shaft 21 is provided.
The operation pin 21b of the sub speed change lever 21 connected to a is inserted.

By rotating the transmission lever 6a in the front-rear direction to rotate the transmission switching unit 11, and by rotating the transmission lever 6a in the neutral N zone in the left-right direction,
The sub transmission lever 21 is switched to low speed L, neutral N, or high speed H, and along the shift guide hole 9, high speed forward (movement) 9a, low speed forward (snow removal) 9b, reverse 9c.
The switching operation can be performed in the shift. Now, FIG.
In the state (1), the sub-transmission lever 21 is at the neutral N position, and the transmission changeover unit 11 is also in the neutral N zone in FIG. 1, and the snow removing machine 1 has stopped traveling. The length of the elongated hole 15a of the play guide member 15 is set at the forward position 9
The length from a, 9b to the reverse position 9c is substantially the same.

When the snow removing machine 1 performs a snow removing operation, as shown in FIG. 4, when the shift lever 6a is rotated rightward in the neutral N zone, the operation arm 14, the play guide member 15, and the link arm 16 are moved. Via link plate 17
Is rotated clockwise about the shaft 18 and the link arm 19 is rotated.
The shift guide 20 is moved to the left via the
By 1b, the auxiliary transmission lever 21 is switched to the low speed L side. When the shift lever 6a is moved along the guide hole 9b for low-speed advance (snow removal), the vehicle body is moved to the guide hole 9b.
The automatic speed change is performed in a low speed forward state, and the auger 7 and the snow throwing chute 8 perform the snow removing work. This shift lever 6a
When the gear is returned to the neutral N zone from the state in which the gear is shifted to the low-speed forward state, the sub-transmission lever 21 is still switched to the low-speed L side, and even if the transmission lever 6a is almost upright as shown in FIG. Is at the low speed L position, and when the lever is slightly tilted to the left, the sub-transmission lever 21 returns to the neutral N position.

When the snowplow 1 is advanced (moved) at a high speed, the shift lever 6a is rotated leftward in the neutral N zone (the state shown in FIG. 1). Via link plate 17
Rotates counterclockwise about the shaft 18, and the link arm 1
The sub-transmission lever 21 is switched to the high-speed H side by the operation pin 21b by moving the transmission guide 20 to the right through the switch 9. When the shift lever 6a is moved along the guide hole 9a for high-speed advance (movement), the vehicle body is moved to the guide hole 9a.
Within a, the vehicle is automatically shifted in a high-speed forward state and travels forward.

When the snow blower 1 is moved backward, the shift lever 6a is rotated rightward in the neutral N zone in the same manner as when snow removal work is performed, and the auxiliary shift lever 21 is switched to the low speed L side. When the vehicle body is moved substantially along the guide hole 9c for reverse movement in a substantially upright state as shown in FIG. 5, the vehicle body is automatically shifted in the guide hole 9c in a low-speed reverse state and moves backward. When the snow blower 1 is moved backward, the shift lever 6a is turned to the left in the neutral N zone to switch the sub shift lever 21 to the high speed H side, as in the case of moving forward (moving) at high speed. By moving the vehicle along the guide hole 9c for reversing the vehicle in a substantially upright state, the vehicle body can be automatically shifted in the guide hole 9c in a high-speed reversing state and can move backward. Further, at the time of the reverse movement, the shift lever 6a is moved along the guide hole 9c for the reverse movement while the auxiliary shift lever 21 is previously switched to the low speed L side or the high speed H side, so that the automatic transmission is performed at the low speed or the high speed state. You can change the speed. When traveling in reverse at high speed, it is desirable to equip a back buzzer and a back lamp for safety.

In the snow blower 1 having such a configuration, the power from the engine 4 is transmitted to the transmission 5, the auger 7, and the snow throwing chute 8. Drive and auger 7,
Snow removal work is performed by the snow throwing chute 8. At this time, the shift lever 6a is turned rightward in the neutral N zone, and the link plate 17 is turned clockwise about the shaft 18 via the operation arm 14, the play guide member 15, and the link arm 16, and the link The shift guide 20 is moved to the left via the arm 19, and the auxiliary shift lever 21 is switched to the low speed L side by the operation pin 21b, and the shift lever 6a
Is moved along the guide hole 9b for low-speed advance (snow removal), whereby the vehicle body is automatically shifted in the low-speed advance state.

When the snow remover 1 is moved without performing the snow removing operation, the shift lever 6a is rotated leftward in the neutral N zone, and the shift lever 6a is rotated through the operation arm 14, the play guide member 15, and the link arm 16. Link plate 17
Rotates counterclockwise about the shaft 18, and the link arm 1
The auxiliary transmission lever 21 is switched to the high-speed H side by the operation pin 21b by moving the transmission guide 20 to the right through the transmission guide 9, and the transmission lever 6a is moved to the guide hole 9 for high-speed forward (movement).
a along the guide hole 9a.
The vehicle is automatically shifted in the high-speed forward state and travels forward. When the snow blower 1 is moved backward, the shift lever 6a is
The sub-transmission lever 21 is switched to the low speed L side or the high speed H side, and is moved along the reverse guide hole 9c to perform automatic transmission at a low speed or a high speed.

[0015]

As described above, according to the transmission of the snow blower of the present invention, the transmission 5 allows the shift operation to be performed by one operation lever 6a, and the shift guide hole 9 of the operation lever 6a. Is composed of a first guide hole 9a, a second guide hole 9b, and a third guide hole 9c, and is movable in the left-right direction between the first guide hole 9a and the second guide hole 9b. A neutral N zone is provided to form a Y-shape. The first guide hole 9a can be switched to a high-speed advance, the second guide hole 9b can be switched to a low-speed advance, and the third guide hole 9c can be switched to a reverse shift. In the third guide hole 9c, the operation lever 6a is rotated left and right in the neutral N zone to switch the sub transmission lever 21 to the high speed side or the low speed side, and then to shift while combining the high speed and the low speed. of , Fast forward, slow forward, backward of 3
A stop zone that stops at the neutral position is formed between the two guide holes, so that the operating lever does not move straight from the forward position to the reverse position or from the reverse position to the forward position. Therefore, once the vehicle is in the neutral position, the travel of the body is stopped, and then the next shift is performed, so that the safety of the body travel operation is ensured. In addition, switching between high speed and low speed when the vehicle is moving backward can be performed with one operation lever.

[Brief description of the drawings]

FIG. 1 is a plan view of a shift guide hole according to the present invention.

FIG. 2 is a side view of a speed change operation unit.

FIG. 3 is a view as viewed from an arrow A in FIG. 2;

FIG. 4 is an explanatory diagram of an operation of a shift operation unit.

FIG. 5 is an explanatory diagram of an operation of a shift operation unit.

FIG. 6 is a side view of the entire snowplow to which the present invention is applied.

FIG. 7 is a plan view of a conventional example of a shift guide hole.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Snow remover 2 Base 3 Crawler 4 Engine 5 Transmission (transmission) equipped with a hydraulic stepless transmission mechanism 6 Operation part 6a Shift lever 7 Auger part 8 Snow throwing chute 9 Shift guide hole 9a High speed advance guide hole 9b
Low-speed forward guide hole 9c Reverse low-speed or high-speed guide hole 10 Rotation support frame 11 Speed changeover section 12 Pivot shaft 13 Friction plate 14 Operation arm 15 Play guide member 15a Long hole 16, 19 Link arm 16a, 19a Pin 17 Link plate 18 Shaft 20 Speed change guide 21 Sub speed change lever 21a Speed change shaft 21b Operation pin

Claims (1)

(57) [Claims] 1. A snow removing machine (1) that is operated to shift gears by a transmission (5) including a hydraulic stepless transmission mechanism, wherein the transmission (5) performs a gear shift operation with a single operating lever (6a). ), So that the shift guide hole (9) of the operation lever (6a) is aligned with the first guide hole (9a ).
Structure de second guide hole and (9b) and the third guide hole (9c)
The first guide hole (9a) and the second guide hole (9a).
b) Neutral (N) that can move in the left-right direction between
A zone is provided and formed in a Y-shape, and the first guide hole (9
In (a), the speed can be switched to high speed forward, to the low speed advance in the second guide hole (9b), and to the reverse shift in the third guide hole (9c) . In the third guide hole (9c), the operation lever ( 6a) is rotated left and right in the neutral (N) zone to switch the sub-transmission lever (21) to the high-speed side or the low-speed side, and then to shift while combining high-speed and low-speed. Transmission of snowplow.