GB2160484A

GB2160484A - Earth-moving vehicle

Info

Publication number: GB2160484A
Application number: GB08423943A
Authority: GB
Inventors: Sakae Horokawa; Hiroshi Fukaya; Yuji Takada
Original assignee: HANDOZER IND CO Ltd
Current assignee: HANDOZER IND CO Ltd
Priority date: 1984-06-22
Filing date: 1984-09-21
Publication date: 1985-12-24
Also published as: JPS6110371U; GB8423943D0; JPH044056Y2

Abstract

An earth-moving vehicle has a bed frame (A) of the vehicle body provided with a gate-like support frame (D) bestriding a power unit (B) mounted on the bed frame, and the base end of a boom (C) supporting a working mechanism is supported on the upper portion of the support frame (D), at least one (50) of the left and right struts of the gate-like support frame (D) being constited as a fuel tank. The power unit (B) includes an engine (E) and a hydraulic pump (P) supplying hydraulic fluid to the working mechanism and to a propulsion hydraulic motor (M). The bed frame (A) is formed as a flat box constituting a hydraulic fluid tank for hydraulic pump (P). The working mechanism may be a breaker or a back-hoe. <IMAGE>

Description

SPECIFICATION Earth-moving vehicle This invention relates to improvements on an earthmoving vehicle in which a power unit consisting of a prime mover, hydraulic drive unit, etc. and an working machine operated by the power unit are mounted on a bed frame of a vehicle body travelling through a travelling unit.

In an earth-moving vehicle like back-hoe, breaker, etc. the volume of the vehicle body may be desirably lessened so that the vehicle is to be operated on narrow roads or in narrow spaces. This, however, is restricted for some reasons.

One of the reasons is that the long boom needs to be formed so as to enlarge the movement region of the working machine supported on the end of the boom to the vehicle body for improving the operability and when such long boom is mounted on the front end side of the bed frame constituting the vehicle body is located in front of the power unit mounted on the bed frame, the balance of the vehicle body is degraded unless the bed frame is formed sufficiently long in front of the shaft supporting point of the boom, and when the base end side of said boom is bifurcated to be supported on both left and right sides at the rear end side of the bed frame mounting the power unit for shortening the longitudinal length of the bed frame; the left and right pivoting of the boom becomes difficult to degrade the operability.

Also, another problem exists in that the bed frame needs the minimum space for supporting the respective constitutent members of the power unit and the boom so that the bed frame is not to be sized less than the space for mounting these members.

An object of the present invention is to provide an earth-moving vehicle which is free from these restrictions and improves the operability while lessening the vehicle body.

To achieve this object, the present invention is proposed a means by which a gate-like support frame bestriding a power unit mounted on a bed frame of the vehicle body is provided on the bed frame to support the base end of a boom for supporting a working machine on the upper portion of the support frame and at least one of left and right struts for the gate-like support frame is constituted as a fuel tank.

This means is free from restrictions in supporting the boom pivotably in the horizontal and vertical direction since the shaft supporting point of the boom is located at the rear end side of the bed frame and on the upper surface of the power unit mounted on the bed frame, so that the longitudinal length of the bed frame is to be shortened without degrading the operability, and the space for the fuel tank mounted on the bed frame is dispensed with since the caviety in the strut of the support frame supporting the boom is used for the fuel tank, so that the bed frame is to be lessened so much.

The above-mentioned and other objects and features of the invention will become apparent from the following detailed description taken in conjunction with the drawings which indicate an embodiment of the invention.

In the accompanying drawings: Figure 1 is a schematic side view showing the whole breaker of an earth-moving vehicle embodying the present invention; Figure 2 is a rear side view showing said breaker; Figure 3 is a plan view showing said breaker; Figure 4 is a perspective view showing a bed frame of said breaker; Figure 5 is a side view showing the bed frame of said breaker; Figure 6 is a plan view showing the bed frame of said breaker; Figure 7is a rear side view showing the bed frame of said breaker; Figure 8 is a sectional view showing the bed frame of said breaker, taken along the line I-I in Figure 5; Figure 9 is a sectionai view showing the bed frame of said breaker, taken along the line ll-ll in Figure 5; Figure 10 is an exploded perspective view showing a boom of said breaker; and Figure 11 is an explanatory illustration of hydraulic system of the power unit mounted on the bed frame of said breaker.

Figure 1 is a schematic side view showing the whole breaker 1 of an earth-moving vehicle embodying the present invention.

In Figure 1, A designates a bed frame for supporting travelling wheels a, a to constitute a vehicle body, B a power unit mounted on the bed frame A, C a boom, D a support frame for supporting the base end of the boom C.

As shown in Figures 5,6 and 7, the bed frame A is formed like a flat box longer longitudinally (laterally in Figures 5 and 6) and having a cavity in the interior (Figure 8) which is filled with working oil to constitute a working oil tank. An opening 20 is provided in one corner at the front end side (right side in Figure 6) on the upper surface side of the bed frame and mounted a cover plate 25 provided with a working oil pouring pipe 22 with an opening and closing lid 21 and a suction pipe 24 with a suction filter 23, as shown in Figure 11. Also, on a machine wall 26 at the front surface side of the bed frame A is provided a nipple 29 for connecting a manifold return 27 through a spin filter 28.

The power unit B mounted on said bed frame A, as shown by the chain line in Figure 1, is constituted by the engine E rnounted and supported on the upper surface of the bed frame A, a radiator R supported on the upper surface side of the engine E and a hydraulic pump P mounted on the rear surface side of said engine E, the interior of the bed frame being used for the working oil tank for receiving working oil used for the hydraulic pump P. Further, V designates a controlling valve unit mounted in the control section cover 31 mounted integrally with the rear surface side of the cover 30 covering the upper portion of said power unit B. Also, BT designates a battery supported in a position near the front end side on the upper surface of the bed frame A.

As shown in Figure 10, the boom C is constituted from a boom body 40 and a bracket 42 for pivoting the base end of the boom body 40 about a pivot 41.

The bracket 42 is supported by a post 43 on the upper portion of the support frame D to be pivoted horizontally and vertically about the pivot 41 by the operation of a hydraulic cylinder 44 (Figure 1) spanning the bracket 42 and the boom body 40 and pivoted horizontally by a hydraulic cylinder 45 (Figure 3) provided between the bracket 42 and the support frame D. And a breaker body 47 with a tilt 46 is mounted on the end of the boom body 40 with left and right mounting plates 48,48 and pivoted vertically by a hydraulic cylinder 49 provided between said mounting plates 48,48 and the breaker body 47.

The support frame D supporting the boom C is formed like a gate having left and right struts 50, 51 and connecting member 52 for interconnecting the upper ends of these struts (Figure 7) and mounted integrally with the bed frame A by connecting the respective lower ends of the left and right struts 50, 51 to both left and right sides of the rear end of said bed frame A (Figure 4). Thus, the support frame D bestrides said power unit B and the cover 30 covering said power unit B mounted on the bed frame A so that the pivotal fulcrum of the base end of said boom C supported on the support frame D is located above said power unit B in the rear end side of the bed frame A.

And as shown in Figure 9, the left and right struts 50,51 of said gate-like support frame D is formed like a hollow tube. One strut 50 is provided on the top with an oiling port 54 with an opening and closing lid 53 and on the rear surface side with an oil gauge 55 formed of a bypass-like transparent pipe. The cavity in the strut 50 is constituted as a fuel tank t for the engine E of the power unit B.

Travelling wheel axle supports 6,6 respectively provided to bear travelling wheels a ... on both front and rear ends of said bed frame A bear the axles of the travelling wheels a ... And the axles of the left and right travelling wheels a,a located in the front are driven by the hydraulic motor M mounted on the front travelling wheel axles support 6. Also, the left and right travelling wheels a,a located in the front are interlocked with the left and right ones a,a located in the rear through a transmission mechanism provided in a transmission case 60 mounted on both left and right side surfaces of the bed frame A.

Further, 57 designates a shaft hole for bearing the post 43 to pivot horizontally the boom C, 58 a mounting hole for supporting an end of the hydraulic cylinder 45 to pivot horizontally the boom C, 61 a mounting holeforthe hydraulic motor M, 80 a control lever for the controlling valve unit V and 81 an accelerator lever.

The earth-moving vehicle constituted as above described according to the present invention operates as follows: When the hydraulic cylinder 44 is operatively driven by the power unit B the long boom C is pivoted vertically about the pivot 41 and horizontally by the operation of the hydraulic cylinder 45 to displace substantially the working position of the breaker body 47 supported on the end of the boom C. The pivotal fulcrum about which the boom C is pivoted vertically and horizontally is located above the power unit B mounted on the bed frame A at the rear end side thereof, so that the balance of the vehicle body is satisfactorily maintained.

And fuel oil for the engine E to drive the power unit B is supplied from a fuel tankt utilizing the cavity in the strut 50 constituting the support frame D of the boom C.

As above described, in the present invention means, since the base end providing the pivotal fulcrum of the boom C is supported on the upper portion of the gate-like support frame D erected on the rear end side of the bed frame A to be located at the rear end side of the bed frame A above the power unit B mounted on the bed frame A, the long and large boom C is to be mounted on the bed frame A under the high stability and better operability condition while the longitudinal length of the bed frame A is to be shortened. Further, since the gate-like support frame D utilizes the interior of the strut 50 constituting said frame D for the fuel tank t, the space in which the fuel tank t is mounted on the bed frame A is to be substantially omitted so that the size of the bed frame A will be reduced by the volume of the fuel tank.

Thus, according to the present invention, is provided the earth-moving vehicle which improves the operability while providing the compact vehicle body.

Claims

1. An earth-moving vehicle comprising: a bed frame of a vehicle body; a gate-like support frame bestriding a power unit mounted on said bed frame; and a boom supporting a working machine, the base end of said boom being supported on the upper portion of the support frame; whereby at least one of left and right struts of the gate-like support frame is constituted as a fuel tank.

2. An earth-moving vehicle, substantially as hereinbefore described with reference to the accompanying drawings.

3. The features herein described or their equivalents, in any patentably novel selection.