JPH0674598B2 - Vehicle work equipment mounting device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a work implement mounting device for a vehicle, and is used for detachably attaching a backhoe to the rear of a tractor, for example.

(Prior Art) As a technique for detachably mounting a working machine such as a backhoe to the rear of a vehicle such as a tractor, an upper support bracket and a left and right lower support bracket are provided between a pair of left and right traveling bodies at the rear of the vehicle body. An upper fitting portion and a pair of left and right lower fitting portions are provided on the machine frame side of the work machine, and the upper fitting portion is fitted to the upper receiving metal fitting and the lower fitting portion is fitted to the lower receiving metal fitting from above respectively. Some are equipped with an upper locking means and a lower locking means for detachably taperingly fitting and locking the upper and lower fitting parts to the upper and lower receiving fittings.

(Problems to be Solved by the Invention) In the prior art, a wedge bolt is used as a pair of left and right lower locking means, and the wedge bolt is tightened from the rear side to fasten the fitting portion to the fitting. It was locked, and it was very troublesome to operate this wedge bolt when attaching and detaching the work implement.

That is, there is a machine frame of the working machine near the rear of the vehicle body,
Moreover, since the rear wheels (running bodies) are located on both the left and right sides of the mounting device, the pair of left and right lower locking means is in a narrow position, and it is very difficult to operate. Therefore, the wedge portion is restricted to the narrowed portion. Manipulating the bolt was very complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above conventional problems, and is provided for the purpose of easily operating the lower locking means.

(Means for Solving the Problem) The present invention is provided with an upper receiving bracket 44 and a left and right lower receiving bracket 40 between a pair of left and right traveling bodies 4 behind the vehicle body 1,
An upper fitting portion 50 and a pair of left and right lower fitting portions 56 are provided on the machine frame 21 side of 20, and the upper fitting portion 50 is the upper receiving fitting 44 and the lower fitting portion 56 is the lower receiving fitting 40. A vehicle provided with an upper locking means 53 and a lower locking means 57 for locking the upper and lower fitting portions 50 and 56 to the upper and lower receiving metal fittings 44 and 40 while allowing the upper and lower fitting portions 50 and 56 to be freely fitted and removed from the upper side. In the work equipment mounting device of
The following technical measures are taken to achieve the stated purpose.

That is, according to the present invention, the pair of left and right lower locking means 57 are provided on the machine frame 21 side so as to be slidable back and forth so that the inclined engaging portion 60 at the tip end engages with the lower receiving metal fitting 40 from the lower surface side. A lock rod (61), a spring (62) for urging the lock rod (61) toward the lower receiving metal fitting (40) side, and an operation lever (64) for operating the lock rod (61) in a non-engaging direction against the spring (62). , The operating lever 64
On the side, a cam member 63 that cams when the operating lever 64 is operated in the non-engaging direction is provided.

(Operation) When locking with the lower locking means 57, the lower fitting portion 56 is fitted into the lower receiving metal fitting 40 from above, and then the operation lever 64 is rotated from the position 73 to the position 72.

Then, the lock rod 61 slides forward from the retracted position by the spring 62, and the inclined engaging portion 60 at the tip engages with the lower surface side of the lower receiving metal fitting 40 (see FIG. 1).

As a result, the lower fitting portion 56 is irremovably locked from the lower receiving fitting 40.

To unlock, move control lever 64 from position 72 to
When it is rotated backward to 73, the cam member 63 is rotated and the lock rod 61 is slid to the retracted position (non-engaging direction) against the spring 62 by the cam operation.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

In FIG. 6, reference numeral 1 denotes a tractor body, which is composed of an engine, a transmission case 2, and the like, has a pair of left and right front wheels 3 and rear wheels 4, and the front wheels and the rear wheels are traveling bodies.

5 is a hood, 6 is a driver's seat, 7 is a steering wheel, and the driver's seat 6 can change its posture between a forward posture and a rearward posture,
The driver's seat 6 is provided on a hydraulic device 9 having a pair of left and right lift arms 8 for lifting and lowering a working machine.

A front loader 10 is mounted on the front part of the tractor vehicle body 1. The loader 10 includes a pair of left and right masts 11, a pair of left and right braces 12 protruding forward from each mast 11, and a top portion of each mast 11. Left and right pair of mounted booms 13, each boom
A boom cylinder 14 for moving up and down 13, a bucket 15 pivotally attached to the tip of the boom 13, a bucket cylinder 16 for rotating the bucket 15, and the like are provided.

Each mast 11 is detachably attached to a mast mount 18 of a pair of left and right reinforcing frames 17 provided along the front-rear direction of the tractor body 1, and the front end of each brace 12 projects forward from both sides of the engine. The front axle frame 19 is detachably attached.

Reference numeral 20 is a backhoe (working machine), which is detachably attached to the rear of the tractor vehicle body 1.
Machine frame 21, swivel base 23 pivotally mounted on the machine frame 21 about a vertical swivel axis 22, boom 25 pivotally mounted on the swivel base 23 by a pin 24, and hoisting of the boom 25 Boom cylinder 26, arm 27 pivotally attached to the tip of boom 25, arm 27
An arm cylinder 28 for bending and extending the bucket, a bucket 29 pivotally attached to the tip of the arm 28, a bucket cylinder 30 for rotating the bucket 29, a control box 31 provided on the machine frame 21, and a pair of left and right. It is equipped with 32 outriggers.

In FIGS. 4 and 5, a mounting frame 33 is fixed to the rear portion of the vehicle body 1, and a machine frame (mounting frame) 21 of the backhoe 20 is detachably mounted on the mounting frame 33.

The mounting frame 33 includes a pair of left and right lower brackets 34 and 35, a middle bracket 36 that connects the upper portions of the left and right lower brackets 34, and a connecting plate 37 that connects the lower portions of the left and right lower brackets 34. is doing.

The lower bracket 34 has a front portion fixed to the vehicle body 1 and a front lower portion fixed to the rear end of the reinforcing frame 17 with bolts, and a rear lower portion bent into an L shape and fixed to the connecting plate 37 with bolts.

On the outer side of the rear lower portion of each lower bracket 34, a taper-shaped lower receiving metal fitting 40 is fixed by welding a chevron-shaped receiving material 39 to a rod 38. Reference numeral 41 is a lower link connecting pin.

The upper bracket 35 is fixed to the rear upper portion of the vehicle body 1 by a bolt through a mounting plate 42 welded to the front end thereof, and the upper bracket 35 has a plurality of top link connecting pin holes 43 in the vertical direction at the front portion.

As shown in FIG. 5, the left and right upper brackets 35 have a wider space in the rear portion than in the front portion, and a valley-shaped receiving material 45 forming a tapered upper receiving metal fitting 44 is welded thereto (see FIG. 4). ).

The middle bracket 36 has a rear view gate shape, and the lower left and right sides are fixed to the bracket 34 with bolts. The middle bracket 36 also serves as a cover for the PTO shaft 46 projecting from the rear surface of the vehicle body 2.

The mounting frame 21 is a lower corner pipe of the pair of upper and lower corner pipes 47.
A pair of left and right lower plates 48 are projected forward from the left and right sides of 47, and an upper plate 49 is projected forward in the left-right center of the upper corner pipe 47.

An upper fitting portion 50 is provided at the projecting end of the upper plate 49, and the upper fitting portion 50 is composed of a round bar 51 and a valley-shaped mounting material 52, and is taper-fitted to the upper receiving metal fitting 44 so as to be freely fitted and removed from the upper side. Combined with top locking means
The upper locking means 53 is locked by 53, and is composed of a bolt 54 penetrating the round bar 51 and the valley-shaped mounting material 52, and a nut 55 provided on the upper receiving metal fitting 44 so that the bolt 54 can be screwed. There is.

A lower fitting portion 56 is provided at each of the projecting ends of the pair of left and right lower plates 48, and the lower fitting portion 56 is fitted into the lower receiving metal fitting 40 from above in a taper manner so that the lower fitting portion 56 can be freely fitted and removed. Locked by means 57.

As shown in FIG. 1, the lower fitting portion 56 projects inwardly from the trough-shaped mounting material 58, and is shaped to be taper-fitted to the chevron-shaped receiving material 39 of the lower receiving metal fitting 40 from above. On the lower part of 39, a wedge receiving surface 59 is formed which is inclined forward and downward.

As shown in FIGS. 1 to 3, the lower locking means 57 slides back and forth on the machine frame 21 side so that the inclined engaging portion 60 at the tip engages with the wedge surface 59 of the lower receiving metal fitting 40 from the lower surface side. A freely-equipped lock rod 61, a spring 62 for urging the lock rod 61 toward the lower bracket 40, and a cam member 63 for operating the lock rod 61 in the non-engaging direction against the spring 62. The operating lever 64 and the like.

The lock rod 61 is inserted into the sliding guides 65, 66 which project from the inner side of the lower plate 48, and a pin (spring pin) 67 is attached to the lock rod 61 in the vertical direction. The upper and lower cam plates 68, 68 of the cam member 63 are pivotally attached to the cam member 63, and the cam surfaces 69 of the upper and lower cam plates 68, 68 are arranged corresponding to the cam receiving surface 70 of the sliding guide 65 from the rear side. Further, the spring 62 is fitted over the lock rod 61 and is provided between the pin 67 and the guide body 66 as an elastic shape.

The upper and lower cam plates 68, 68 are connected by a connecting plate 71, and the operating lever 64 is fixedly secured on the upper cam plate 68 by blindly covering 67, where the pin 67 is the center and the lock position 72 of FIG. Can be operated between the unlock position 73 and the unlock position 73 as shown by the arrow 74, and when in the lock position 72, the operation lever 64 has its axial direction oriented in the front-rear direction, and as shown by the arrow 74, the unlock position 73 When,
It projects laterally outward.

In addition, in FIG. 4 and FIG. 5, 75 is a top link of a three-point link, and 76 is also a pair of left and right lower links, and when the backhoe 20 is used, the lower link 76
Are stored over the pin 77 on the vehicle body 2 side and the housing box portion 78 on the machine frame 21 side. Further, 79 is a reinforcing member of the lower plate 48, 80 is a bracing, 81 is a telescopic cylinder of the outrigger 32, and 82 is a swivel cylinder of the backhoe.

In the above-described embodiment, the backhoe 20 is attached to the tractor body 1.
To attach, do the following.

That is, since the backhoe 20 normally has the pair of left and right outriggers 32 and the bucket 29 grounded to the ground (stationary), the tractor vehicle body 1 is retracted to move the backhoe.
The upper and lower receiving fittings 40 and 44 on the tractor body 1 side are positioned below the upper and lower fitting portions 50 and 56 of the 20.

Then, if the positions of both tables match, after connecting the hydraulic system of the tractor body 1 side and the backhoe 20 side, the cylinder 82 of the outrigger 32 is contracted and the machine frame 21 is lowered.

Then, the upper / lower fittings 50, 56 are fitted to the upper / lower receiving fittings 40, 44 on the tractor vehicle body 1 side from above, so that the upper / lower locking means 53, 57 may be locked respectively.

In this case, the operating lever 64 of the lower lock means 57 is in the unlock position 73, and this position 73 is located on the cam receiving surface 70.
Since 69 is engaged and held, the operating lever 64 may be rotated in the direction opposite to the arrow 74, whereby the lock rod 61 is slid forward by the bias of the spring 62, The inclined engaging portion 60 at the tip engages with the wedge surface 59 on the lower surface side of the lower receiving metal fitting 40, and the lower fitting portion 56 is locked so as not to separate from the lower receiving metal fitting 40.

Therefore, the lower locking means 57 is located between the pair of left and right traveling bodies 4 and is very difficult to operate, but the operating lever 64
Can be locked by rotating.

Further, in order to release the lock, when the operating lever 64 is operated in the direction of the arrow 74, the cam surface 69 of the cam member 63 gradually rides up on the cam receiving surface 70, and the lock rod 61 is moved against the spring 62. You can easily unlock it by retracting it.

In the above embodiment, the upper and lower receiving metal fittings 44, 40 have a chevron shape, and the upper and lower fitting portions 50, 56 have a valley shape. 50 and 56 may be Yamagata. Further, the operation lever 64 may be provided with a notch or the like for holding the operation lever 64 at the unlock position.

(Effects of the Invention) According to the present invention, the pair of left and right lower locking means are provided so as to be slidable back and forth on the machine frame side so that the inclined engaging portions at the tips engage with the lower receiving fitting from the lower surface side. A lock rod, a spring for urging the lock rod toward the lower receiving metal, and an operation lever for operating the lock rod in a non-engaging direction against the spring. Is provided with a cam member that acts as a cam when the operating lever is operated in the non-engaging direction. Locking and unlocking operations are extremely easy.

In particular, when unlocking, because of the cam action, the lock rod can be easily released even if the engagement force of the lock rod is increased by the spring.

[Brief description of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a side sectional view of a lower locking means, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, and Fig. 3 is a sectional plan view of Fig. 1. FIG. 4 is a side view of the entire mounting device, FIG. 5 is a plan view of the same, and FIG. 6 is an overall side view of a tractor with a front loader and a backhoe mounted. 1 ... tractor body, 4 ... running body, 20 ... work machine (backhoe), 21 ... machine frame, 40 ... lower receiving metal fitting, 44 ... upper receiving metal fitting, 50 ... upper fitting part, 53 ...... Up lock means, 56…
... Lower fitting part, 57 ... Lower locking means, 60 ... Engagement part, 61 ...
… Lock rod, 62 …… Spring, 63 …… Cam member, 64 …… Operating lever.

Claims (1)

[Claims] 1. A working machine (20) comprising a pair of left and right traveling bodies (4) behind a vehicle body (1) and an upper receiving metal fitting (44) and a pair of left and right lower receiving metal fittings (40). An upper fitting part (50) and a pair of left and right lower fitting parts (56) are provided on the frame (21) side, and the upper fitting part (50) is attached to the upper receiving metal fitting (44) and the lower fitting part (44). 56) is fitted into the lower receiving metal fitting (40) from the upper side in a freely taperable manner, and these upper and lower fitting portions (56) (5
A work implement mounting device for a vehicle, comprising an upper lock means (53) and a lower lock means (57) for locking 6) to upper and lower receiving fittings (44) (40). 57) is a lock rod (61) slidably mounted on the machine frame (21) side so that the inclined engaging portion (60) at the tip engages with the lower receiving metal fitting (40) from the lower surface side. And a spring (62) for urging the lock rod (61) toward the lower receiving fitting (40), and an operating lever for operating the lock rod (61) in the non-engaging direction against the spring (62). (64) and a cam member (63) that cams when the operation lever (64) is operated in the non-engaging direction on the operation lever (64) side. A working machine mounting device for a vehicle characterized by: