JPH06127227A - Automatic lock device for lock pin - Google Patents

Abstract

PURPOSE:To facilitate the locking operation for a lock pin and lock it surely when the lock pin used for towing, etc., is mounted on a machine body of a work vehicle. CONSTITUTION:A guide lever 31 is installed rigidly at the top of a lock pin 29, and a stopper 32 is installed protrudedly at the middle part of the lock pin 29 in the same direction as the guide lever 31. A slant surface part 33 is provided on the upper surface of a lock hole 36 drilled in a machine body, and also the area around the lock hole 36 is recessed to provide a seat 37. Also a stopper groove 38 is drilled in one side of the lock hole 36 in parallel with the slant surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic locking device for a locking pin which is inserted into a locking hole of a work vehicle.

[0002]

2. Description of the Related Art In attaching a towing locking pin to a machine body of a work vehicle, a stopper groove 3 is provided on one side of a locking hole 2 formed in the machine body 1 as shown in FIG. At the same time, the stopper pin 5 is provided at the intermediate portion of the locking pin 4 so as to project. Then, the locking pin 4 is inserted into the locking hole 2 while aligning the stopper pin 5 of the locking pin 4 with the stopper groove 3, and as shown in FIG. After protruding to the lower surface, the locking pin 4 is rotated to shift the stopper stopper 5 from the position of the stopper groove 3. Thus, the locking pin 4 is set as shown in FIG.
The locking pin 4 cannot be pulled out upward.

[0003]

In the conventional towing locking pin 4, as described above, the retaining stopper 5 is provided in the locking hole 2.
The locking pin 4 is inserted into the stopper groove 3 so that the locking pin 4 is rotated and locked. However, the rotation operation is difficult to perform, and the inserted locking pin 4 gradually rotates in the locking hole 2 due to the vibration during work, and the stopper 5 and the stopper groove 3 are again aligned and locked. May come off.

Therefore, there arises a technical problem to be solved in order to simplify the locking operation of the locking pin and securely lock the locking pin, and the present invention aims to solve this problem. To aim.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been proposed in order to achieve the above object, and is a locking pin which is inserted into a locking hole opened in a machine body of a work vehicle. A guide lever is fixed to the top of the locking pin in a substantially horizontal direction, and a stopper is provided at the middle of the locking pin in the same direction as the guide lever so as to project. Provided is an automatic locking device for a locking pin, which is inclined in the direction, provided with a seat by recessing around the locking hole, and opening a stopper groove in the locking hole substantially parallel to the inclined surface. .

[0006]

When the locking pin is attached to the machine body of the work vehicle, the retaining stopper of the locking pin is inserted into the stopper groove of the locking hole. When the locking pin is inserted, the guide lever at the top of the locking pin contacts the inclined surface of the upper surface of the locking hole. This guide lever slides down the inclined surface due to the weight of the locking pin, and the entire locking pin rotates below the inclined surface.

Thus, the guide lever is automatically accommodated in the recessed seat, and the retaining stopper protruding in the same direction as the guide lever is disengaged from the stopper groove of the retaining hole, so that the retaining pin is It becomes locked. Also, when the inserted locking pin tries to rotate due to vibration during work, the guide lever is locked at the side edge of the recessed seat, the locking pin is prevented from rotating, and the lock is released. Prevent.

[0008]

An embodiment of the present invention will be described in detail below with reference to the drawings. 1 and 2 show a wheel loader as an example of a work vehicle, which includes a bucket 11 and an arm 12.
It is divided into a front machine body 13 equipped with such construction machines and a rear machine body 16 equipped with an engine section (not shown) such as an engine and a hydraulic device, a driver's seat 14 and an operation mechanism section 15 and the like.
A bracket 17 is provided at the center rear portion of the front body 13, and a connecting portion 18 is provided so as to project from the center front portion of the rear body 16, and the bracket 17 and the connecting portion 18 are pin-connected to each other to form the front body 1
3 and the rear body 16 are connected. Further, a hydraulic cylinder 19 is projected forward from the side of the connecting portion 18 of the rear machine body 16, and the piston rod of the hydraulic cylinder 19 is connected to the side of the bracket 17 of the front machine body 13.

In the wheel loader, the operator operates the operation lever 20 to move the arm 12 and the bucket 1.
While operating a construction machine such as No. 1 and the like, the steering mechanism 21 is operated to turn the front machine body 13 to the left and right. For example,
When the operator operates the steering mechanism 21 in the left direction, the piston rod of the hydraulic cylinder 19 contracts due to the operation of the hydraulic device, and the front body 13 is centered on the pin joint portion of the bracket 17 and the connecting portion 18 with respect to the rear body 16. In Fig. 2
Then, it rotates counterclockwise. Therefore, the wheel loader turns left.

A balance weight 23 is attached to the rear end of the main frame 22 of the rear machine body 16, and an engine 25 is mounted in the vicinity of the upper position of the rear wheels 24, 24 provided on the rear machine body 16. A hydraulic engine unit 26 such as an HST is housed inside the front part and in the front part of the engine 25. In addition, the hood 27 on the top of the engine 25
The driver's seat 1
4 is formed. Further, a locking pin 29 for pulling an auxiliary vehicle for transportation or a working machine is inserted through the central portion of the balance weight 23. The reference numeral 30 indicates the front body 1.
It is a front wheel attached to 3.

FIG. 3 is an enlarged view of the locking pin 29.
A U-shaped guide lever 31 is fixed to the top of the locking pin 29 in a substantially horizontal direction, and a stopper 32 is provided at an intermediate portion of the locking pin 29 in the same direction as the guide lever 31.
To project. FIG. 4 shows the back surface of the balance weight 23. The rear edge of the upper surface of the balance weight 23 is obliquely installed so as to be lower in the rear direction, and an inclined surface portion 33 is provided. Air passage holes 34 and 35 are opened in the step. A locking hole 36 is opened at the center of the slope 33 on the left and right sides, and a seat 37 is provided by recessing the periphery of the locking hole 36, and the locking hole is provided substantially parallel to the inclined surface of the slope 33. A stopper groove 38 is opened in one side of 36. The locking hole 36 is opened to have a diameter slightly larger than the diameter of the locking pin 29 so that the locking pin 29 can be inserted thereinto, and the stopper groove 38 is also opened corresponding to the retaining stopper 32 of the locking pin 29. Has been pierced. Further, the locking hole 36 and the stopper groove 38 penetrate from the seat 37 of the inclined surface portion 33 to the flow hole 34, and even between the flow hole 34 and the flow hole 35, the lock hole 36 and the stopper hole 38 are coaxial with the lock hole 36. Further, the locking hole 39 having the same diameter is opened. No stopper groove is provided in the lower locking hole 39.

Then, the operator grasps the locking pin 29 shown in FIG. 3 and matches the retaining stopper 32 with the stopper groove 38 of the locking hole 36 shown in FIG. Is inserted into the locking hole 36 and the hand is released. As shown in FIGS. 5 and 6, the inserted locking pin 29 descends while the retaining stopper 32 slides in the stopper groove 38, and the locking pin 29 is inserted into the locking holes 36 and 39. Then, one side portion of the guide lever 31 comes into contact with the slope portion 33.

After that, the guide lever 31 slides down the slope 33 due to the weight of the locking pin 29, and as shown in FIGS. 7 and 8, the locking pin 29 and the guide lever 31.
Rotate together. Then, the guide lever 31 is automatically accommodated in the recessed seat 37, and the retaining stopper 32 protruding in the same direction as the guide lever 31 is inserted into the locking hole 36.
The locking pin 29 stops rotating from the stopper groove 38.

When the locking pin 29 is pulled upward in this state, a stopper 32 for preventing the locking pin 29 from coming off.
Comes into contact with the inner upper surface of the flow hole 34, and the locking pin 29 does not come out of the locking hole 36. When the hitch (not shown) of an auxiliary vehicle or the like is connected to the locking pin 29, the locking pin 29 tries to rotate due to the vibration of the machine body, but the guide lever 31 is seated. Since it is locked at the side edge portion of 37, it is possible to prevent the locking pin 29 from being unlocked. Further, when locking the locking pin, there is no need to insert the pine needle pin into the locking pin or attach the roll pin.

Here, as shown in FIGS. 1 and 2, a radiator 40 is provided at the rear of the engine 25, and a radiator heat shield plate 41 is provided at the upper rear portion of the radiator 40. Figure 9
Indicates a radiator heat shield plate 41, and left and right side plates 41b and 41c are vertically provided on the lower surface of the inclined plate 41a. FIG. 10 shows the rear portion of the radiator 40, and since the radiator heat shield plate 41 is installed on the rear upper portion of the radiator 40 as described above, the hot air of the engine passing through the upper portion of the radiator 40 collides with the inclined plate 41a. And flows downward, and is discharged to the outside through the gap 42 between the hood 27 and the balance weight 23. The hot air passing through the lower portion of the radiator 40 is discharged to the outside from the flow holes 34 and 35 of the balance weight 23. The balance weight 23 has a large space inside so that the hot air passing through the radiator 40 can be easily discharged.

Thus, the hot air that has passed through the radiator 40 is not rewound and stays behind the radiator 40, and it is possible to prevent the hot air from being blown directly to the bonnet hood 27 made of synthetic resin. The heat dissipation effect is improved. The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified one.

[0017]

According to the present invention, as described in detail in the above-mentioned one embodiment, when the retaining pin of the retaining pin is aligned with the stopper groove of the retaining hole and the retaining pin is inserted, the guide of the retaining pin is obtained. The lever contacts the inclined surface of the machine body and is stored in the recessed seat. Therefore, the locking pin is automatically locked, and the locking pin can be locked without performing a complicated operation. or,
Since the guide lever is locked at the side edge of the recessed seat,
The invention has various effects such as the rotation of the locking pin due to vibration of the machine body is prevented, and the lock can be prevented from being accidentally released.

[Brief description of drawings]

FIG. 1 is a side view of a wheel loader that is an example of a work vehicle.

FIG. 2 is a plan view of a wheel loader.

FIG. 3 is a perspective view of a locking pin.

FIG. 4 is a perspective view showing the back surface of the balance weight.

FIG. 5 is a perspective view showing a state in which a locking pin is inserted into a locking hole.

FIG. 6 is a partially cutaway side view showing a state in which a locking pin is inserted into a locking hole.

FIG. 7 is a perspective view showing a state in which the locking pin is locked in the locking hole.

FIG. 8 is a partially cutaway side view showing a state in which the locking pin is locked in the locking hole.

FIG. 9 is a perspective view of a radiator heat shield plate.

FIG. 10 is a partially cutaway side view showing the rear portion of the radiator.

FIG. 11 is a perspective view showing a process of inserting and locking a conventional locking pin into a locking hole.

FIG. 12 is a perspective view showing a process of inserting and locking a conventional locking pin into a locking hole.

FIG. 13 is a rear view showing a state in which a conventional locking pin is locked.

[Explanation of symbols]

 29 Locking Pin 31 Guide Lever 32 Locking Stopper 33 Slope 36, 39 Locking Hole 37 Seat 38 Stopper Groove

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Renji Goto No.1 Hachikura, Tobe-cho, Iyo-gun, Ehime Prefecture

Claims (1)

[Claims] 1. A locking pin to be inserted into a locking hole formed in a machine body of a work vehicle, wherein a guide lever is fixed to a top portion of the locking pin in a substantially horizontal direction, and the locking is provided. A stopper is provided in the middle of the pin in the same direction as the guide lever, and the upper surface of the locking hole is tilted in one direction, and the periphery of the locking hole is recessed to form a seat. An automatic locking device for a locking pin, wherein a stopper groove is opened in the locking hole substantially parallel to the surface.