JPH06270852A - Crawler support and drive device for drawler vehicle - Google Patents

Abstract

PURPOSE:To make a device for supporting and driving a crawler simple and strong and to realize smooth up and down swinging and stable holding of a vehicle body in a crawler vehicle in which the crawler is provided to swing up and down around a horizontal transverse shaft so as to enhance traveling performance on an irregular ground. CONSTITUTION:A horizontal transverse shaft 20 for turnably supporting a longitudinal middle part of track frame is fitted to a lower end of a support frame 21 of which an upper end is fixed to a vehicle body with a longitudinally long span, and at least a part of this support frame 21 is formed into a transmission case 26. A transmission mechanism 27 for the horizontal transverse shaft 20 is housed in the transmission case 26, and the horizontal transverse shaft 20 is interlockingly connected to a crawler drive wheel shaft 24 with a chain transmission mechanism 29 housed in a swing case which swings up and down around the horizontal shaft 20 as a center.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tracked vehicle in which a crawler disposed below a vehicle body can be vertically swung back and forth about a horizontal axis, and more specifically, to a front and back antirail vehicle. The present invention relates to a support and drive device for a crawler that is vertically swingable.

[0002]

2. Description of the Related Art The front-rear direction middle portion of a track frame of a crawler disposed below a vehicle body is rotatably mounted on a horizontal horizontal shaft mounted on the vehicle body side, and the horizontal horizontal axis is centered on the horizontal horizontal shaft. A tracked vehicle is known in which the crawler can be swung up and down in an anti-front and back direction to improve followability on uneven surfaces.

[0003]

A conventional device of this type is a supporting device for supporting the crawler so as to vertically swing back and forth and a drive for transmitting power to the vertically swinging crawler. Since the devices are individually composed, the entire device is complicated and has poor durability. In addition, since the supporting device, the driving device, and the like have a complicated outer shape as a whole, adhesion or accumulation of mud is likely to occur on the device part thereof, and it is difficult for the crawler to swing back and forth smoothly. There is also a drawback that the vehicle body is suddenly changed in posture or greatly tilted due to the swinging of the crawler. The present invention has been made for the purpose of solving these problems, and the following technical means are taken to achieve this object.

[0004]

That is, in the crawler support and drive system for a crawler vehicle according to the present invention, the middle portion of the track frame 17 of the crawler 3 in the front-rear direction is mounted on the vehicle body 1 side. Rotatably mounted on the horizontal horizontal shaft 20
In a crawler track vehicle in which the la 3 swings up and down in a contra-posterior direction about the horizontal horizontal axis, the horizontal horizontal axis 20 is attached to the lower part of a support frame 21 which is fastened to the vehicle body 1 with the upper part of the front and rear part having a long span. The support frame 21 is supported and formed, and at least a part of the support frame 21 is formed in the transmission case portion 26, and the transmission case portion 26 accommodates a transmission mechanism 27 for the horizontal lateral shaft 20. Between the drive wheel shaft 24 of the crawler 3 and the horizontal horizontal shaft 2
A chain transmission mechanism 29 housed in a swing case 28 that swings up and down about 0 is interlockingly connected.

Further, the support frame 21 has a front side edge 21a.
Is a slanting surface that is slanted rearward and the rear side edge 21b is a slanting surface that is slanted down in the opposite direction to the front side edge 21a, and the support frame 21 is positioned close to the inside of the crawler 3. In addition, the swing case 28 for interlockingly connecting the horizontal horizontal shaft 20 and the drive wheel shaft 24 is provided outside the crawler 3 and within the width of the crawler belt 19.

Further, the support frame 21 is provided with a front stopper-3.
0 and rear stoppers 31 are provided, and front contact portions 32 and rear contact portions 33 corresponding to the stoppers 30 and 31 are provided.
Is set on the track frame 17 and the upper allowable movement range of the rear portion of the crawler set by the rear stopper 31 and the rear contact portion 33 is set to 0 or close to it, and the front stopper-3
0 and the upper allowable movement range of the crawler front portion set by the front abutting portion 32 are set to be larger than the upper movement allowable range of the crawler rear portion.

[0007]

In the crawler support and drive device according to the first aspect of the present invention, the horizontal horizontal shaft 20 for rotatably supporting the middle portion of the track frame 17 in the front-rear direction is provided with the upper part in the front-rear direction. It is attached to a lower portion of a support frame 21 fixed to the vehicle body 1 with a long span, and at least a part of the support frame 21 is formed in a transmission case portion 26, and the horizontal horizontal shaft 20 is attached to the transmission case portion 26.
Transmission mechanism 27 for storing the power transmission mechanism 27 to the swing horizontal shaft 20 and the drive wheel shaft 24 of the crawler 3 in a swing case 28 that swings up and down about the horizontal horizontal shaft 20. Since it is configured to be interlocked and connected with 29, the crawler support and drive device are integrated into the support frame 21 part in common although the crawler 3 swings up and down in the anteroposterior direction. As a result, the whole structure is simplified, and the crawlers that swing up and down in the front-rear direction are firmly supported and have excellent durability.

According to the second aspect of the present invention, the front edge 21a of the support frame 21 which also serves as the accommodating portion of the crawler drive device is an inclined surface which is inclined rearward and the rear edge 21b is the front edge 21a. Since the support frame 21 is provided inside the crawler 3 as an inclined surface that is inclined downward in the opposite direction, the crawler support and drive section have a simple outer shape and the front side thereof. Due to the inclination of the edge 21a and the rear edge 21b, adhered and accumulated mud is eliminated, and further, a swing case 28 for interlocking connection between the horizontal horizontal shaft 20 and the drive wheel shaft 24 is provided outside the crawler 3 so that the crawler belt 19 has a track. Since it is provided so as to be accommodated within the width, and the adhesion and deposition of the mud on the case 28 is small, the adhesion and the deposition of the mud do not hinder the forward and backward swinging of the crawler.

Then, the swing case 28 is crawler 3
Since the support frame 21 is provided on the outer side of the vehicle, and the support frame 21 is disposed close to the inner side of the crawler 3, a wide space is secured in the lower abdomen of the vehicle body 1, and, for example, the ridge is straddled. It is now possible to drive well in the open state without any problems.

According to a third aspect of the present invention, there is provided a crawler supporting and driving device which includes a front stopper 30 and a rear stopper on the side of the support frame 21.
31 is provided, and the front contact portion 32 and the rear contact portion 33 corresponding to the respective stoppers 30 and 31 are installed on the track frame 17 side, and are set by the rear stopper 31 and the rear contact portion 33. The upper allowable movement range of the crawler rear portion is set to 0 or close thereto, and the upper allowable movement range of the crawler front portion set by the front stopper 30 and the front contact portion 32 is set to that of the rear crower portion. Since it is set larger than that, it can firmly and securely receive the crawler that swings back and forth and vice versa, and prevents the front part of the crawler from excessively descending and changing the body's sudden posture. It is possible to reliably prevent a steep slope and to drive with good stability.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an overall side view of an endless track vehicle in which the device of the present invention is implemented, FIG. 2 is a schematic plan view of the endless track vehicle, FIG. 3 is a front view of the endless track vehicle, and FIG. FIG. 5 is a side elevational view showing an enlarged main part with a part broken away, FIG. 5 is a plan sectional development view of the main part shown in FIG. 4, and FIG. 6 is a front crawler support of an endless track vehicle and its operating mode. The front view shown in FIG. 7 is a transmission system diagram of the tracked vehicle.

In the tracked vehicle of the illustrated embodiment, a pair of left and right front crawlers 2 and 2 and a pair of left and right rear crawlers 3 and 3 are arranged below the vehicle body 1 at four front, rear, left and right positions. Then, it is configured as a 4-crawler type endless track vehicle. The vehicle body 1 is formed in a substantially rectangular shape in a plan view, and has an engine room 5 for accommodating the engine 4 at one corner in the front, a seat 6 mounted above the engine room, and a front area of the engine room. An operating device including a steering column 7 and the like is provided, and a flat and wide loading portion is secured in a portion from a lateral side portion of the engine room 5 to a rear portion thereof.

The pair of left and right front crawlers 2, 2 are supported by a front axle case 8 mounted below the front end of the engine room 2 in a side view. Specifically, the left and right ends of a front axle case 8 configured by extending a cylindrical case to the left and right from a differential case attached to the vehicle body 1 so as to be swingable left and right around a center pin. The final parts 10 and 10 are rotatably attached to the part so as to be rotatable around the kingpin shafts 9 and 9.
Each final case 10 is equipped with a track frame 11, and the endless crawler belt 13 is hung around each of the track wheels 11 and the guide wheels and the drive wheels 12 mounted on each track frame 11 to front crawlers. 2 and 2 are constructed so that they are forcibly driven by a front drive system F which is arranged to be transmitted to the drive wheels 12 through the interior of the front axle case 8. Has been done.

Further, the left and right final cases 10, 1
0 is interlocked by a tie rod 14, and one of the final cases 10 is interlocked with a steering wheel 15 provided on the operation column 7 through a drag rod 16 to rotate the steering wheel 15. The front crawlers 2 and 2 are configured to be steerable.

On the other hand, each of the rear wheels 3, 3 has a drive wheel 18 provided at the rear end of the track frame 17.
The crawler belt 19 is hung around the guide wheel arranged at the front end and the rolling wheel group arranged between the two wheels to form a grounding length longer than that of the front crawlers 2, 2. The vehicle body 1 is crocodile so as to be able to swing up and down in a predetermined range centering on the axis of a horizontal horizontal shaft 20 which is provided in the middle part of the front-rear direction in a slightly biased manner toward the drive wheels. Support frame 21 provided
It is mounted on the lower end of the bearing. The crawler belt 19 of the rear crawler 3 and the above-mentioned crawler belt 13 of the front crawler 2 are wound so as to form a rise angle on the front side and the rear side of each crawler. .

The support frame 21 of the embodiment is formed in a substantially V shape in a side view, and its upper rear end portion and upper front end portion are fixed to mounting seats 22 and 23 provided on the lower surface side of the vehicle body 1. Although provided, the shape of the support frame 21 and the mounting structure to the vehicle body 1 are not limited to those of the embodiment, and the point is that the upper portion of the support frame 21 has a long span in the front-rear direction.
Any modified structure may be used as long as it is firmly fixed to the lower side.

The horizontal horizontal shaft 20 for supporting each rear crawler 3 so as to be able to swing up and down in the anteroposterior direction is supported by the lower portion of the support frame 21 provided as described above. The horizontal horizontal shaft 20 also serves as one shaft of the rear drive system B that transmits power to the drive wheel shaft 24. The horizontal drive shaft 25 and the drive shaft 25 (which is provided horizontally at the upper front end of the support frame 21). The support frame 2 is provided between the output shafts of the missions described later).
1 is connected to the transmission case portion 26 formed in at least a part of the first transmission mechanism 27 in an interlocking manner.
0 and the drive wheel shaft 25 are interlockingly connected by a chain transmission mechanism 29 housed in the swing case 28, and the drive wheel 18 of the rear crawler 3 is forcibly driven while the rear wheel is driven.
The la 3 can be swung up and down in the front-rear direction with respect to the horizontal axis 20.

The supporting frame 21 is formed to have a width as thin as possible, and is arranged close to the inside of the rear crawler 3, and the swing case 28 is provided on the rear side opposite to the supporting frame 21. It is preferably provided outside the crawler 3 so as to be accommodated within the lateral width of the crawler belt 19. Further, the front side edge 21a of the support frame 21 in a side view is an inclined surface inclined obliquely rearward and the rear side edge. It is convenient to provide 21b as an inclined surface that is inclined downward in the direction opposite to the front edge 21a in order to reduce the adhesion and accumulation of mud.

Furthermore, front and rear stoppers 30 and 31 are provided at two front and rear positions on the side of the support frame 21, and front and rear abutting portions 32 and 33 corresponding to the respective stoppers 30 and 31 are provided. Installed corresponding to the track frame 17 side,
The crawler set by the rear stopper 31 and the rear contact portion 33 has an upper allowable movement range of the rear portion set to 0 or a value close to 0, and is set by the front stopper 30 and the front contact portion 32. It is preferable to set the upper allowable movement range of the front portion to be larger than the upper allowable movement range of the crawler rear portion.

A transmission having a drive shaft 25 provided laterally at the upper front end of the support frame 21 as an output shaft is housed in a mission case 34 mounted along the lower surface of the vehicle body 1 and is powered by the engine 4. Is configured so that it can be transmitted to the rear crawlers 3 and 3 and the front crawlers 2 and 2, and a specific example thereof is shown in FIG.

In FIG. 7, the mission is provided with an input shaft 35 which is parallel to the output shaft of the engine 4 at the front part of the mission case 34 and which projects to the left and right at the rear end part of the mission case 34. The drive shafts 25, 25 are provided, and the input shaft 35 and the drive shafts 25, 25 are interlockedly connected by a speed change transmission mechanism described below.

Between the output shaft of the engine 4 and the input shaft 35,
The hydraulic transmission is equipped with a main clutch, and the input shaft 35 is provided with a hydraulic continuously variable transmission 36 on the side opposite to the transmission mechanism. An auxiliary transmission shaft 37 is provided at the output of the hydraulic continuously variable transmission 36. Are linked together. Then, between the sub-transmission shaft 37 and the next intermediate shaft 38, a high-low two-stage sub-transmission gear train that can be selectively coupled selectively is provided, and transmitted to the intermediate shaft 38 via any one of the gear trains. The power is further transmitted to the drive shafts 25, 25 via a pair of left and right side clutches 39 which are formed on the shaft next to it. Further, the pair of left and right side clutches 39 are provided with left and right brakes 40, 40 in association with each other, and when the left and right side clutches are individually or simultaneously "disengaged", the left and right brakes are released. It is designed to operate in a braking state.

A gear shift operation tool for selectively connecting the gear train of the sub-transmission shaft 37 and an operation tool for operating the side clutch and the brake are arranged in the gap between the transmission case 34 and the lower surface of the vehicle body. Thus, the operation tool is provided so as to extend along the lower surface of the vehicle body 1 to the driving device section and can be remotely operated in the driving device section, and the operation tool for operating the side clutch and the brake has already been described. The side clutch on the inside of the turning when the front wheels 2, 2 are turned over a set angle in cooperation with each other so that they can be operated in association with the steering operation of the front wheels 2, 2 by the steering wheel. Is turned off and the brake on the same side is braked.

In addition, a bevel gear transmission mechanism 41 is interlockingly installed at one shaft end of the intermediate shaft 38 of the mission case 34, and a front portion having a freely bendable portion extending forward from the bevel gear transmission mechanism 41 is provided. The drive shaft 42 is input-coupled to the differential case of the front axle case so that the front drive system F is operated in synchronization with the rear drive system B.

[Brief description of drawings]

FIG. 1 is an overall side view of a crawler vehicle in which the device of the present invention is implemented.

FIG. 2 is a schematic plan view of a tracked vehicle.

FIG. 3 is a front view of the tracked vehicle.

FIG. 4 is a partial side view showing an enlarged main portion of a crawler vehicle with a part cut away.

5 is a plan cross-sectional development view of the main part shown in FIG.

FIG. 6 is a front view showing the support of the front crawlers of the tracked vehicle and the operating mode thereof.

FIG. 7 is a transmission system diagram of a tracked vehicle.

[Explanation of symbols]

 1 Vehicle Body 3 Crawler (Rear Crawler) 17 Track Frame 19 Crawler Track 20 Horizontal Horizontal Axis 21 Support Frame 21a Front Edge of Support Frame 21b Rear Edge of Support Frame 26 Transmission Case Part 27 Transmission Mechanism 28 Swing Case -S 29 Chain transmission mechanism

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Shigeru Ken, 428, Enami, Okayama, Okayama, Seirei Industry Co., Ltd. (72) Inventor, Yoshikazu Hiroshige, 428, Enami, Okayama, Okayama, Seirei Industry Stock company

Claims (3)

[Claims] 1. A track frame (17) for a crower (3).
The horizontal part of the horizontal axis (2
(0) is rotatably mounted so that the crawler (3) swings up and down in the anti-front and back directions about the horizontal axis of a horizontal track. Is installed in the lower part of the support frame (21) fixed to the vehicle body (1) with a long span, and at least a part of the support frame (21) is transmitted to the transmission case part.
(26), and a horizontal horizontal axis is formed on the transmission case (26).
The transmission mechanism (27) to the (20) is housed, and the space between the horizontal horizontal shaft (20) and the drive wheel shaft (24) of the crawler (3) is vertically moved around the horizontal horizontal shaft (20). Swing case that swings
A crawler supporting and driving device for a tracked vehicle, which is interlockedly connected by a chain transmission mechanism (29) housed in (28). 2. The crawler support and drive device according to claim 1, wherein the support frame (21) has a front side edge (2).
1a) is an inclined surface that is inclined rearward and obliquely downward and the rear side edge (2
1b) is provided as an inclined surface which inclines downward in the opposite direction to the front edge (21a), and the supporting frame (21) is positioned close to the inside of the crawler (3) and the horizontal horizontal axis ( Swing case (28) for interlocking connection between 20) and drive wheel axle (24)
Is provided outside the crawler (3) so as to fit within the width of the crawler track (19). 3. The crawler support and drive device according to claim 1 or 2, wherein the support frame (21) is provided with a front stopper (30) and a rear stopper (31), and each stopper is provided. The front abutting portion (32) and the rear abutting portion (33) corresponding to-(30) and (31) are installed on the track frame (17), and the rear stopper (31) and the rear abutting portion (33) are installed. ), The upper limit of the crawler rear movement is set to 0 or close to 0, and the crawler front upper movement set by the front stopper (30) and the front abutment (32) is set. A crawler support and drive device for a crawler track, wherein an allowable range is set to be larger than an upward movement allowable range of a rear part of the crawler.