JPH0253676A - Running transmitting structure for work truck - Google Patents

Abstract

PURPOSE:To simplify a structure by enabling an on-off control to be performed of reversing action simultaneously when a side clutch on-off use shift gear is controlled sliding, in case of the structure provided with a reversing transmitting mechanism which transmits power in a reversing condition from one of the pair of right and left running gears to the other. CONSTITUTION:A pair of shift gears 4, 5 are relatively rotatably further slide controllably mounted to a supporting shaft 3 of a normally rotating gear 2 transmitting power from a running-use transmission through the first transmitting gear 1, and input gears 8, 9 of right and left axles 6, 7 are meshed with each shift gear 4, 5. While each shift gear 4, 5 provides normally rotating and reversing bevel gears 4a, 5a; 4b, 5b, and reversing bevel gears 12, 13 are meshed with the right and left shift gears 4, 5. And a reversing transmitting system 19 is constituted by providing a bevel gear shaft 18 to be mounted over to bevel gears 16, 17, provided in the other ends of supporting shafts 14, 15 of each bevel gear 12, 13, so as to rotate each bevel gear 12, 13 in a reverse direction to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a travel transmission structure for a work vehicle equipped with a pair of right and left travel devices such as crawler travel devices that cannot be steered independently.

[Conventional technology]

In the above-mentioned work vehicle, each of the left and right crawler traveling devices is equipped with a side clutch for power transmission, and is configured so that by disengaging one side clutch, a gentle turn can be made to the side clutch disengaged side. However, for example, as disclosed in Japanese Patent Laid-Open No. 61-89175, a reverse transmission mechanism that can transmit power from one crawler traveling device to the other crawler traveling device in a reverse state is provided, and one Some are configured so that they can also perform super-turns by reversing the crawler traveling device.

[Problem to be solved by the invention]

In the disclosed structure, the reverse rotation transmission mechanism must of course be kept in the OFF state when the vehicle is not making a super pivot turn. To perform a super-turn by reversing one crawler traveling device from straight ahead, slide the shift gear for side clutch manual operation to the side clutch disengaged side, and then shift the gear for important operation in the reverse transmission mechanism. The shift gear must be slid toward the input side. On the other hand, in order to return the vehicle from the super-turning state to the straight-ahead state, it is necessary to slide the shift gear of the reversing transmission mechanism to the off side, and then slide the shift gear for the side clutch to the on position.

As described above, if an operating system is constructed in which the shift gear for the side clutch and the shift gear for the reverse transmission mechanism can be slid with the timing shifted, the operating system inevitably becomes complicated. If even the slightest malfunction occurs in this operating system, for example, the shift gear for the reverse transmission mechanism may be operated to the inward side even though the shift gear for the side clutch has not completely slid to the inward side. There is a risk of damage to the transmission system due to the double bite phenomenon.

The present invention has been made by focusing on the above-mentioned problem, and is directed to a work vehicle equipped with a reversing transmission mechanism that transmits power from one traveling device to another traveling device in a reversed state. The purpose is to simplify the structure and reduce malfunctions.

[Means to solve the problem]

The feature of the present invention is that the above-mentioned traveling transmission structure for a working vehicle is configured as follows. In other words, the left and right shift gears, which transmit power to each of the left and right traveling gears, are supported in a slidable manner, and are interlocked with the forward rotation gear, to which power is transmitted from the upper transmission, and the reverse rotation transmission system. A pair of connected left and right reverse rotation gears are arranged with respect to the shift gear, one of the shift gears is engaged with the forward rotation gear, and the other shift gear is engaged with the reverse rotation gear. The structure is such that power is transmitted in a reversed state from the shift gear meshed with the diversion gear to the shift gear meshed with the reverse gear via the reverse rotation transmission system, and its functions and effects are as follows.

[For production]

With the configuration described above, the state in which both shift gears (4) and (5) are engaged with the forward rotation gear (2) as shown in FIG. ) is separated from the forward rotation gear (2),
In this state, a side clutch disengaged state occurs in which power transmission to the right traveling device (10) is cut off.

Then, as shown in Figure 2, slide the shift gear (4) further to the right in the paper to shift the reverse gear (12) to the right side.
When the left shift gear (5) is engaged with both the forward rotation gear (2) and the left reverse rotation gear (13),
The power is transmitted in a reversed state to the right shift gear (4) via the left reverse gear (13) and reverse transmission system (19).

〔Effect of the invention〕

As described above, by sliding the shift gear for the side clutch, it is now possible to perform the side clutch disconnection operation and the important reverse operation. This eliminates the need for an operating system, simplifying the structure.

The structure is such that one shift gear can be slid into three positions: forward rotation gear engagement position (forward rotation transmission state), neutral position (side clutch disengaged state), and reverse rotation gear engagement position (reverse rotation transmission state). , There is no possibility that the forward rotation transmission state and the reverse rotation transmission state occur at the same time (and there is no phenomenon of damage to the transmission system due to the double bite phenomenon as in the conventional structure).

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

Figure 1 shows the structure around the legs of the harvester, and the power from the transmission for traveling (not shown) is transferred to the first transmission gear (1).
It is transmitted to the forward rotation gear (2) via. A pair of shift gears (4) and (5) are attached to the support shaft (3) of the forward rotation gear (2) so as to be relatively rotatable and slidable, and the shift gears (4),
(5) is permanently engaged with the input gears (8) and (9) of the left and right axles (6) and (7). In the state shown in Fig. 1, the left and right shift gears (4) and (5) are engaged with the forward rotation gear (2), and the driving power is transmitted from the left and right crawler traveling devices (10) and (11). It is transmitted in the normal rotation state (forward state).

Further, the left and right shift gears (4), (5) are provided with forward rotation bevel gears (4a), (5a) and reverse rotation bevel gears (4b), (5b), as well as the left and right shift gears (4), (5). a reversing gear (12),
(13) A bevel gear as shown in FIG. And the support shaft (14) of both bevel gears (12), (13)
), a bevel gear (16) provided at the other end of (15)
, (17), and a reversing transmission system (19) is constructed such that the bevel gears (12) and (13) rotate in opposite directions.

Then, as shown in Fig. 1, the left and right shift gears (4),
(5) is engaged with the forward rotation gear (2), the forward rotation bevel gears (4a) and (5a) of both shift gears (4) and (5) are respectively bevel gears (12).

It is designed to interlock with (13). In this case, both bevel gears (12) and (13) are interlocked and connected so as to rotate in opposite directions, and both bevel gears (12) and (13) are
Since the reduction ratio between gears 12) and (13) is 1.0, there is no problem between shift gears (4) and (5).

For example, as shown in Figures 1 and 2, slide the right shift gear (4) away from the forward rotation gear (2),
When the reverse bevel gear (4b) of the shift gear (4) is engaged with the bevel gear (12), the power is transferred to the forward rotation gear (4b).
2) through the left shift gear (5) to the left crawler traveling device (11) in the normal rotation state, and the power is transmitted to the left shift gear (5), the carabe bell gear (13L bevel gear shaft (1g), the bevel gear ( 12) Reverse transmission system (19
) to the right shift gear (4) and crawler traveling device (10) in a reversed state. This causes the aircraft to make a sharp turn to the right at that location.

Also, the shift gears (4) and (5) are separated from the forward rotation gear (2), and the shift gears (4) and (5) are separated from the forward rotation gear (2).
Reverse bevel gear (4a), (5a), (4b),
By setting (5b) to a neutral position where it does not mesh with bevel gears (12) and (13), it is also possible to cut off power to one crawler traveling device (10) or (11) and turn. .

[Another example]

In the above-mentioned embodiment, the bevel gear shaft (18) was installed between both bevel gears (12) and (13), and the reverse transmission system (19) was constructed by interlocking and connecting the bevel gear shaft (18).
, (13), an even number of spur gears may be arranged on the support shafts (14), (15) to constitute the reverse transmission system (19).

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the traveling transmission structure for a working vehicle according to the present invention, in which Fig. 1 is a longitudinal sectional front view of the vicinity of the shift gear in the forward state, and Fig. 2 shows the right crawler with the right shift gear meshed with the right bevel gear. FIG. 3 is a longitudinal sectional front view showing a state in which the traveling device is driven in reverse. (2)...Forward rotation gear, (4), (5)...
...Shift gear, (10), (11)...
- Traveling device, (12), (13)... Reverse gear, (19)... Reverse transmission system.

Claims (1)

[Claims] Separate left and right shift gears (4) and (5), which transmit power to each of the left and right pair of traveling devices (10) and (11), are supported in a slidable manner so that the power from the upper transmission is transmitted. a pair of left and right reverse rotation gears (12) interlockingly connected to each other by a forward rotation gear (2) and a reverse rotation transmission system (19);
(13) is arranged with respect to the shift gears (4) and (5), one of the shift gears (4) and (5) is engaged with the forward rotation gear (2), and the other shift gear ( 4) and (5) are engaged with the reverse rotation gears (12) and (13), and the reverse rotation gears (12) and ( 13)
A traveling transmission structure for a working vehicle, which is configured to transmit power in a reversed state to shift gears (4) and (5) meshed with each other through the reverse rotation transmission system (19).