JPH017618Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to a self-propelled transport vehicle that can propel itself by driving a traveling device such as a crawler using an engine.
In particular, it relates to those with improved drive systems.

[Conventional technology]

2. Description of the Related Art Self-propelled transport vehicles are known in which an engine and a transmission are provided at one end of a vehicle body in the longitudinal direction, and these are directly transmitted through a belt transmission mechanism.

[Problem that the idea aims to solve]

This type of self-propelled transport vehicle is advantageous in securing a large loading platform floor area because the drive system, such as the engine and transmission, is centrally located in one location. By the way, since the engine and the transmission are directly connected to each other via a belt transmission mechanism, the clutch must be engaged and engaged every time the gear is changed. This means that in the case of a transport vehicle equipped with a crawler traveling device, the vehicle comes to a temporary stop or a state close to it every time the gear is changed, which causes problems in running performance such as sudden rapid changes. Also, if the load is heavy,
Depending on the vehicle speed and engine horsepower, there were problems such as the engine stopping when the clutch was engaged and abnormal wear on the transmission belt. Of course, if a continuously variable transmission is interposed in the transmission system from the engine to the transmission, the above-mentioned problems with clutch engagement and disconnection can be solved, but the problem depends on the installation position of the continuously variable transmission. However, new problems arise, such as a loss of cargo space and an imbalance in the weight of the vehicle in the front-rear direction, resulting in a risk of tipping over. Therefore, the present invention solves the various problems associated with conventional clutch disengagement without disrupting the vehicle weight balance or sacrificing cargo space, allowing smooth gear changes without sudden speed changes, and preventing engine stop and transmission. The purpose of the present invention is to provide a self-propelled transport vehicle that does not cause abnormal belt wear.

[Means to solve the problem]

For this purpose, the present invention has a
A V-belt is provided with a transmission device in which a drive shaft for driving a crawler traveling device projects in the left-right direction, and has a speed change operation mechanism via a bearing device in a transmission system from a prime mover to the transmission device via a clutch. A V-belt continuously variable transmission is installed on the upper part of the transmission device, and the input and output shafts of the V-belt continuously variable transmission are located in approximately the same plane, and the drive shaft is located within the perpendicular width of the input and output shafts in plan view. The gist is that it is placed on the case of the mission device so that it is located at

[Effect]

With this means, gear shifting operations can be smoothly performed using the V-belt type continuously variable transmission without engaging or disengaging the clutch. The V-belt type continuously variable transmission has a horizontally mounted type in which the input and output shafts are arranged in substantially the same horizontal plane, so the ground clearance can be lowered. Further, since the input/output shaft of the transmission is disposed at a front-rear position above the drive shaft of the transmission device in plan view, the center of gravity of the vehicle does not move toward the end of the vehicle body from the drive shaft position.

【Example】

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings. The self-propelled transport vehicle 1 shown in FIGS. 1 and 2 has a loading platform 3 disposed above a crawler traveling device 2, and a transmission system 4 for the crawler traveling device 2 at the rear end of the vehicle body. . The crawler traveling device 2 has a crawler belt 23 wrapped between a drive wheel 21 arranged at the rear of the vehicle body and a tension wheel 22 arranged at the front of the vehicle body. It has a plurality of idle wheels 24 which are arranged to ground the crawler belt 23, and the loading platform 3 is placed at a predetermined ground clearance higher than the drive wheels 21 via a support 26 on a frame 25 that supports these idle wheels 24. Supported. The drive system 4 includes drive wheels 21 of the crawler traveling device 2.
It is equipped with an engine 5, a bearing device 6, and a transmission device 7, and a V-belt type transmission mechanism 8 is configured between the engine 5 and the bearing device 6, and a A V-belt type continuously variable transmission 9 is constructed between them (see Fig. 3). The transmission device 7 has gears for normal rotation, reverse rotation, deceleration, left and right steering clutches built into a transmission case 71 fixed to the frame 25, and has drive shafts 72, 72 from which output is taken out. It protrudes from the transmission case 71 in the left and right direction of the vehicle body. The drive shafts 72, 72 are supported by housings 73, 73, which are integrally provided with the transmission case 71, except for their tips. is fixed. Also, the driven shaft 74
is provided protruding from the transmission case 71 to one side in the left-right direction of the vehicle body, and this driven shaft 74 is
It is disposed closer to the front of the vehicle than the drive shaft 72 and above the loading platform 3. As shown in FIG. 4, a bearing device 6 is provided on the upper surface of the transmission case 71 at a position rearward of the vehicle body from the drive shaft 72 position. This bearing device 6
The transmission rotary shaft 62 is provided with a transmission rotation shaft 62 protruding from a bearing case 61 fixed to a transmission case 71 on both sides in the left-right direction of the vehicle body. An engine support frame 51 is connected to the rear of the transmission case 71 so as to extend rearward from the rear end of the loading platform 3. It is placed so as to protrude on the opposite side to the driven shaft 74 in . Then, the output rotation shaft 52 of the engine 5
By winding a V-belt 83 between V-pulleys 81 and 82 fixed to the transmission rotation shaft 62 of the bearing device 6, and applying tension to the V-belt 83 with a tension pulley 84 supported on the main body of the engine 5,
A V-belt type transmission mechanism 8 is configured between the engine 5 and the bearing device 6. Reference numeral 85 in the figure is a clutch lever that is connected to the tension pulley 84 via a wire (not shown), and its operation releases the tension on the V-belt 83 caused by the tension pulley 84 and transfers power to the transmission rotation shaft 62. It is designed to block transmission. Here, the V-belt type continuously variable transmission 9 is configured such that the transmission rotation shaft 62 of the bearing device 6 is used as an input shaft, and the driven shaft 74 of the transmission device 7 is used as an output shaft. The drive shaft 72 within the width
is located. The pulley on the input shaft side is a variable speed pulley consisting of a half-split pulley 91 fixed to the transmission rotation shaft 62 and a movable half-split pulley 92 that can move toward and away from the half-split pulley in the axial direction. The bearing 9 is attached to the cam plate 93 fitted in the bearing case 61.
4 and are rotatably connected. Since an end cam is formed between the cam plate 93 and the bearing case 61, the movable half pulley 92 is moved in the axial direction by rotating the cam plate 93. Note that the reference numeral 94 in the figure is an operating rod for rotating the cam plate 93, and is linked to a speed change lever 95. The output-side pulley is a variable speed pulley consisting of a half-split pulley 96 fixed to the driven shaft 74 and a movable half-split pulley 97 that can move toward and away from the half-split pulley in the axial direction.
The movable half-split pulley 97 is always pressed toward the half-split pulley 96 by a spring bias. and,
A variable speed V-belt 98 is wound between the input-side pulley and the output-side pulley to constitute the V-belt type continuously variable transmission 9. In the above configuration, the driving force of the engine 5 is transmitted to the transmission device 7 via the V-belt type transmission mechanism 8, the bearing device 6, and the V-belt type continuously variable transmission 9, and the crawler belt 23 is driven by the rotation of the drive wheel 21. Then, the self-propelled transport vehicle 1 travels. Here, the gear shifting operation will be explained. In the state shown in FIG. 3, the wrapping radius of the variable speed V-belt 98 is small on the input shaft (transmission rotating shaft 62) side, and small on the output shaft (driven shaft 74) side.
The self-propelled transport vehicle 1 is decelerated and travels at a low speed. Therefore, when the shift lever 95 is operated in the direction of the arrow in FIG. 1 to push down the operating rod 94 (see FIG. 4), the cam plate 93 rotates and the movable half pulley 92 is moved toward the half pulley 91. Since the V-belt 98 moves closer to , the wrapping radius of the variable speed V-belt 98 becomes larger, and the wrapping radius on the output shaft side becomes smaller by that amount. That is, as the speed change belt 98 bites, the movable half pulley 97 moves in the axial direction away from the half pulley 96 against the biasing force of the spring, and the winding radius of the speed change V belt 98 becomes smaller ( (see FIG. 5), the self-propelled transport vehicle 1 is accelerated and travels at high speed. Such a speed change operation is performed steplessly according to the amount of operation of the speed change lever 95, and does not involve engagement or disengagement of the clutch, so that there is no sudden speed change of the self-propelled transport vehicle 1. The clutch lever 85 is used to switch between forward and reverse. For example, to change from forward to reverse, operate the gear shift lever 95 to bring the vehicle to a low speed state, and then operate the clutch lever 85 to shift the tension. The tension of the V-belt 83 by the tension pulley 84 is released to cut off the power transmission to the transmission rotation shaft 62 and the subsequent parts. By doing so, sudden speed changes of the self-propelled transport vehicle 1 can be prevented. After such an operation, the transmission device 7 is operated by a means not shown in the figure to switch to reverse gear, and then, by operating the clutch lever 82, tension is applied to the V-belt 83 by the tension pulley 84, and power transmission is started. resume.

[Effect of the idea]

As explained above, according to the present invention, the speed change operation is smoothly performed using the V-belt type continuously variable transmission without engaging or disengaging the clutch. This prevents sudden speed changes such as a temporary stop when changing gears, ensuring safe driving, preventing engine stops and abnormal wear of the transmission belt, and improving balance with the load. Good and stable transportation work can be performed. Further, since the V-belt type continuously variable transmission is of a horizontal type in which the input and output shafts are disposed in substantially the same horizontal plane, it can be installed with a low ground clearance, and therefore the loading space is not sacrificed. Furthermore, in the V-belt continuously variable transmission, the drive shaft of the transmission device is arranged within the perpendicular width of the input and output shafts in plan view, so the center of gravity of the vehicle does not move from the drive shaft position to the end of the vehicle body. There is no risk of falling even when starting suddenly, stopping suddenly, or driving on a slope.
It has good transmission efficiency and can be configured compactly.

[Brief explanation of the drawing]

Fig. 1 is a side view of a self-propelled transport vehicle showing an embodiment of the present invention, Fig. 2 is a plan view of the same, Fig. 3 is a partially cross-sectional configuration diagram of the drive system, and Fig. 4 is a V-belt. FIG. 5 is a diagram illustrating the operation of the V-belt continuously variable transmission. 1...Self-propelled transport vehicle, 2...Crawler traveling device, 21...Drive wheel, 22...Tension wheel, 23...
Crawler track, 24... Idle wheel, 25... Frame, 26
...Strut, 3...Cargo platform, 4...Drive system, 5...Engine, 51...Engine support frame, 52...
... Output rotation shaft, 6 ... Bearing device, 61 ... Bearing case, 62 ... Transmission rotation shaft, 7 ... Mission device, 71 ... Mission case, 72 ... Drive shaft, 73 ... Housing, 74 ... ...Driven shaft, 8...
...V-belt type transmission mechanism, 81, 82...V-pulley, 83...V-belt, 84...Tension pulley, 85...Clutch lever, 9...V-belt type continuously variable transmission, 91...Half section Pulley, 92...Movable half pulley, 93...Cam plate, 94...Operation rod, 95...Speed lever, 96...Half pulley,
97...Movable half pulley, 98...Variable speed V-belt.

Claims (1)

[Scope of Claim for Utility Model Registration] A transmission system is provided near the rear end of the vehicle body with a drive shaft protruding in the left-right direction for driving a crawler traveling device, and a transmission system is connected from the prime mover to the transmission system via a clutch. Inside, a V-belt type continuously variable transmission having a speed change operation mechanism via a bearing device is installed on the upper part of the transmission device, and the V-belt type continuously variable transmission has input and output shafts located in substantially the same plane, A self-propelled transport vehicle characterized in that the drive shaft is disposed on the case of the transmission device so that the drive shaft is located within a perpendicular width of the input and output shafts in plan view.