JP5180751B2 - Dump body locking device - Google Patents

Description

  The present invention relates to a dump body locking device in a dump truck having a dump body that is rotatable up and down around a rotation axis between a standing posture and a lying posture, and in particular, the dump body is raised to a standing posture. In particular, the present invention relates to a dump body locking device that uses a lock pin to hold the standing posture of the dump body.

  Dump trucks can be used to quickly discharge a load from the dump body by lifting the dump body in a lying position to a standing position after carrying a crushed stone or soil on the dump body (loading platform). It is used a lot.

  In general, when performing maintenance and inspection work such as the drive mechanism and braking mechanism of the vehicle arranged under the dump body, hydraulic pneumatic circuit, frame, suspension device, etc., or when cleaning the inside of the dump body, In many cases, the work is performed in a state where accessibility to the device is improved by holding the dump body in a standing posture. In order to perform these operations safely, it is necessary to prevent the dump body from descending naturally and maintain the standing posture of the dump body. For this reason, various dump body locking devices have been proposed in the past. .

  Patent Document 1 (Japanese Utility Model Publication No. 1-150142) discloses a frame-side lock pin insertion hole on the frame side of the dump truck, and a concentricity with the frame-side lock pin insertion hole when the dump body is raised to a standing posture. A dump body locking device is disclosed in which body-side lock pin insertion holes that are overlapped are formed. Further, the dump body locking device is provided with an auxiliary bracket that is concentric with the body side lock pin insertion hole and that accommodates the lock pin on an extension line of the body side lock pin insertion hole. .

  According to the dump body locking device described in Patent Document 1, when the dump body is held in an upright position, the lock pin accommodated on the auxiliary bracket side is inserted into the frame side lock pin insertion hole. Slide to the position where it can be inserted. Further, when releasing the standing posture of the dump body, the lock pin inserted through the frame side lock pin insertion hole is slid to the accommodating portion of the auxiliary bracket. By sliding the lock pin in this manner, the standing posture of the dump body can be easily held and released.

  Moreover, in FIG. 5 and FIG. 7 of Patent Document 1, in addition to the body side lock pin insertion hole, in order to store an unnecessary lock pin during normal use, a drilled lock pin storage hole is described. Yes.

  Further, in Patent Document 2 (Japanese Utility Model Publication No. 4-70535), a fixed first frame side lock pin insertion hole is formed on the frame side of the dump truck, and a second lock stay is provided in the rotatable lock stay. A device in which a frame side lock pin insertion hole is formed is disclosed. A body side lock pin insertion hole is inserted into the first frame side lock pin insertion hole or the second frame side lock pin insertion hole according to the raised position of the dump body.

According to the dump body locking device described in Patent Document 2, when the dump body is held in the upright position, the first frame side lock pin insertion hole on the fixed side and the body side The lock pin is inserted into the lock pin insertion hole to prevent the dump body from falling naturally. Further, by inserting the lock pin into the second frame side lock pin insertion hole and the body side lock pin insertion hole formed in the rotatable lock stay, the dump body can be in the standing posture and the lying posture. Can be held in a predetermined posture at an intermediate position.
Japanese Utility Model Publication No. 1-150142 Japanese Utility Model Publication No. 4-70535

  In the dump body locking device described in Patent Document 1, when the lock pin is not used, an auxiliary bracket for storing the lock pin and a sliding operation of the lock pin through the auxiliary bracket are performed. A space for arranging a handle for this is required from the left and right frames to the center.

  When the operator operates the lock pin, the operation is performed between the frames arranged on the left and right of the dump truck. For this reason, in the case of a dump truck having a narrow vehicle width or a dump truck using double tires for the rear wheels, the distance between the right and left locking devices in the dump truck is particularly narrow, and is described in Patent Document 1. It may be difficult to adopt a dump body locking device.

  Moreover, the lock pin accommodation hole described in FIG.5 and FIG.7 of patent document 1 is comprised by the body side lock pin insertion hole, and the internal diameter and the external appearance same. For this reason, the malfunction that an operator tends to confuse both has arisen. For example, to release the holding of the standing posture, the operator must lower the dump body after removing the lock pin from the body side lock pin insertion hole and the frame side lock pin insertion hole. After the dump body is lowered, the lock pin extracted earlier is inserted into the lock pin housing hole. At this time, an operator may mistakenly insert the lock pin through the body side lock pin insertion hole.

  If the dump pin is raised to an upright position while the lock pin is incorrectly inserted into the body side lock pin insertion hole, the frame side bracket is pushed by the pressing force that raises the dump body to the upright position. It will be strongly pressed against. Therefore, problems such as damage to the lock pin and damage to the frame side bracket and the body side bracket are caused.

  Further, in the dump body locking device described in Patent Document 2, there is no place to store the lock pin in a normal use state where the lock pin is not used, and therefore the lock pin may be lost. There is.

  The present invention has been made to solve the above-described problems, and the dump body can be held in an upright position by the lock pin, and the lock pin is inserted into the body side lock pin insertion hole. Even if the dump body is accidentally turned from the lying position to the standing position, the lock pin can be prevented from being strongly pressed against the frame side bracket, and when the dump body is placed in the lying position, An object of the present invention is to provide a dump body locking device capable of storing a lock pin.

In order to achieve the above-described object, the present invention provides a dump truck capable of holding a dump body of a dump truck that is rotatable up and down around a rotation axis between a standing posture and a lying posture in the standing posture. In the body locking device,
Formed in a frame side bracket provided in the frame of the dump truck, formed in a frame side lock pin insertion hole drilled in parallel with the rotation shaft, and a body side bracket provided in the dump body, the dump body is A body-side lock pin insertion hole having a hole portion that overlaps the frame-side lock pin insertion hole without interfering with the frame-side bracket when raised to a standing posture; and when the dump body is in the standing posture, the frame side A lock pin that is inserted between the lock pin insertion hole and the body side lock pin insertion hole and holds the dump body in a standing posture, and
The body side lock pin insertion hole is formed as a long hole, and when the dump body is in a standing posture, one end side of the long hole overlaps the frame side lock pin insertion hole, and the other end side of the long hole is the frame side bracket. The main feature is that it is located on the outer side of the outer peripheral edge on the dump body side.

In addition, as the shape of the body side lock pin insertion hole, it is preferable that the body side lock pin insertion hole is formed as a linear long hole, or is formed as an arc-shaped long hole centering on the rotating shaft. It has become.
Further, it is preferable that a lock pin housing hole for housing the lock pin when the lock pin is not used is formed in the body side bracket.

  In the present invention, since the body side lock pin insertion hole formed in the body side bracket is configured as a long hole, the dump body is accidentally placed in a lying posture while the lock pin is inserted into the body side lock pin insertion hole. Even when the lock pin is turned to the standing posture, it can be avoided that the lock pin is strongly pressed against the frame-side bracket by the pressing force that raises the dump body to the standing posture.

  That is, even if the dump body is accidentally turned from the lying position to the standing position while the lock pin is inserted into the body side lock pin insertion hole, the lock pin is not Even if it abuts on the outer peripheral edge of the side bracket, the abutting lock pin can move along the long hole of the body side lock pin insertion hole while abutting on the outer peripheral edge of the frame side bracket. For this reason, it can be avoided that the lock pin is strongly pressed against the frame side bracket by the pressing force that raises the dump body to the standing posture.

  Moreover, when the dump body is in a standing posture, one end side of the long hole of the body side lock pin insertion hole is overlapped with the frame side lock pin insertion hole, and the other end side of the long hole is on the dump body side of the frame side bracket. It has the structure located in the outer side rather than an outer periphery. With this configuration, even if the dump body is accidentally rotated from the lying posture to the standing posture while the lock pin is inserted into the body side lock pin insertion hole, the lock pin is not longer than the outer peripheral edge of the frame side bracket. It is not sandwiched between the other end side of the hole. Thereby, it is possible to prevent the frame, dump body, and lock pin of the dump truck from being damaged.

  When the dump body is rotated to the upright position, the lock pin is inserted into the hole formed by the one end side of the elongated hole of the body side lock pin insertion hole and the frame side lock pin insertion hole which are in an overlapping positional relationship. By inserting, it is possible to prevent the dump body from descending naturally from the standing posture.

  The shape of the body-side lock pin insertion hole can be configured as a linear long hole or an arc-shaped long hole centering on a rotation axis when the dump body is rotated. With this configuration, even if the dump body is accidentally rotated from the lying position to the standing position while the lock pin is inserted into the body side lock pin insertion hole, the lock pin is not damaged. It can be smoothly moved along the long hole.

  In addition, the body side lock pin insertion hole is formed as a straight elongated hole, and the other end side formation position in the body side lock pin insertion hole is formed higher than the one end side formation position. Thus, the lateral width of the body side bracket that forms the body side lock pin insertion hole can be configured to be narrow.

  The lock pin storage hole for storing the lock pin when the lock pin is not in use can be configured separately from the body side lock pin insertion hole in the body side bracket or by using the body side lock pin insertion hole. It can also be left. As a result, it is possible to prevent the lock pin from being lost, so that workability can be improved.

  Also, by configuring the lock pin storage hole separately from the body side lock pin insertion hole, the shape of the lock pin storage hole and the long hole shape of the body side lock pin insertion hole become different, and the operator There is no mistake in the place where the lock pin is inserted.

  Hereinafter, a representative embodiment of a dump body locking device according to the present invention will be specifically described with reference to the drawings.

  FIG. 1 is an external side view of a dump truck for rough terrain to which a dump body locking device according to the present invention is applied.

  The dump truck 10 includes a frame 12 and a dump body 20 on which crushed stones and soil are loaded. The dump body 20 can be rotated up and down around the rotation shaft 22 with respect to the frame 12. The dump body 20 is hydraulically moved from the most lowered position (the state shown in FIG. 1) to the upright position that is rotated in the direction of the arrow shown in FIG. The hoist cylinder 14 can be turned up and down.

  In other words, by placing the dump body 20 in the lying posture, the load can be loaded and transported in the dump body 20, and by placing the dump body 20 in the standing posture, the load loaded in the dump body 20 can be transferred. It can be discharged from within 20.

  The bottom surface of the dump body 20 behind the pivot shaft 22 is a long hole-shaped body that is connected to the frame 12 side using the lock pin 30 (see FIG. 2) when the dump body 20 is raised to a standing posture. A side lock pin insertion hole 25 is provided. In the embodiment shown in FIG. 1, the body side lock pin insertion hole 25 is formed in the body side bracket 24 disposed on the lower surface of the dump body 20. The body side bracket 24 also has a function of holding the rotating shaft 22 at both ends.

  On the other hand, the rear end side of the frame 12 overlaps with one end side 25a of the body side lock pin insertion hole 25 when the dump body 20 is raised to a standing posture, and the lock pin 30 (see FIG. 2) is locked on the body side. A frame-side lock pin insertion hole 17 that is inserted between the pin insertion hole 25 and the pin insertion hole 25 is provided. In the embodiment shown in FIGS. 1 and 2, the frame side lock pin insertion hole 17 is formed in the frame side bracket 16 disposed on the rear end side of the frame 12.

  The frame-side bracket 16 and the body-side bracket 24 are arranged so as not to interfere with each other when the dump body 20 is raised to a standing posture. In the present invention, an example in which one end side 25a of the body side lock pin insertion hole 25 overlaps the hole shape of the frame side lock pin insertion hole 17 will be described. However, the present invention is limited to this configuration. is not. For example, the shape of the body side lock pin insertion hole 25 at the one end side 25a may be configured to be slightly larger than the hole shape of the frame side lock pin insertion hole 17.

  In this case, when the dump body 20 is raised to a standing posture and the lock pin 30 (see FIG. 2) is inserted between the frame side lock pin insertion hole 17 and the body side lock pin insertion hole 25, the dump body It is desirable to configure so that there is less play with the lock pin so that 20 does not greatly return to the lying posture side.

Next, the structure of the dump body locking device 40 according to the present invention will be described with reference to FIG.
FIG. 2 is a perspective view of the two sets of dump body locking devices 40 arranged in the vicinity of the rotation shaft 22 shown in FIG.

  As shown in FIG. 2, two triangular frame-side rotation shaft brackets 18 that hold the rotation shaft 22 are erected on the upper surfaces of the two frames 12 disposed between the left and right rear wheels. ing. Two sets of body-side brackets 24, each of which is erected from the lower surface of the dump body 20, are rotatable on the outer sides of the frame-side rotation shaft brackets 18 via the rotation shafts 22, respectively. Has been placed.

  As will be described below, the dump body locking device 40 that holds the standing posture of the dump body 20 includes a frame side lock pin insertion hole 17 formed in the frame side bracket 16 and two body side brackets 24. The body-side lock pin insertion hole 25 and the lock pin housing hole 26, which are long holes, are formed, and a lock pin 30 that holds the dump body 20 in an upright posture.

  On the rear end side of each frame 12 of the dump truck 10, an ear-shaped frame-side bracket 16 is disposed so as to protrude rearward. The frame side bracket 16 is provided with a frame side lock pin insertion hole 17 that is formed in parallel with the rotation shaft 22.

  Each body side bracket 24 erected from the lower surface of the dump body 20 has a body side where one end side 25a of the elongated hole overlaps the entire frame side lock pin insertion hole 17 when the dump body 20 is raised to a standing posture. Each of the lock pin insertion holes 25 is formed. Further, at this time, the other end side 25b of the long hole of the body side lock pin insertion hole 25 is configured to be located outward from the outer peripheral edge of the frame side bracket 16.

  That is, in the side view of the dump body locking device 40, as shown in FIG. 3 showing the lying posture of the dump body 20, the body side lock pin insertion hole 25 is formed as a straight elongated hole. Then, as shown in FIG. 4 showing the standing posture of the dump body 20 through the state of the two-dot chain line in FIG. 3, when the dump body 20 is in the standing posture, one end side of the body side lock pin insertion hole 25 is placed. 25a overlaps with the frame side lock pin insertion hole 17, and can constitute a hole through which the lock pin 30 is inserted.

  At this time, the other end side 25b of the body side lock pin insertion hole 25 is located outward from the outer peripheral edge of the frame side bracket 16, and the end of the other end side 25b and the outer side of the frame side bracket 16 are A space larger than the diameter of the pin 30 is secured between the periphery. That is, as shown in FIG. 4, when the dump body 20 is brought into a standing posture by the operation of the hoist cylinder 14 (see FIG. 1), the lock pin 30 inserted into the body side lock pin insertion hole 25 is The structure is such that the pressing force from the cylinder 14 directly presses against the frame-side bracket 16 through the elongated hole of the body-side lock pin insertion hole 25.

  FIG. 2 shows an example of a configuration in which two sets of dump body locking devices 40 each including a pair of body side brackets 24 and one frame side bracket 16 are provided. As the body locking device 40, at least one set of the dump truck 10 can be provided.

  Further, the dump body locking device 40 may be configured to include one body side bracket 24 and two frame side brackets 16 sandwiching the same body side bracket 24 therebetween. In this case, with respect to the rotation shaft 22 side, it is desirable to configure so that one body side bracket 24 is sandwiched between two frame side rotation shaft brackets 18.

  In FIG. 2, when the dump body 20 is raised from the lying posture toward the standing posture, the frame side bracket 16 enters between the two body side brackets 24. When the dump body 20 is further raised to a standing posture, the hole positions on the one end side 25a of the two body side lock pin insertion holes 25 formed on the two body side brackets 24 and the frame side lock pin insertion holes, respectively. The 17 hole positions overlap, and a hole through which the lock pin 30 is inserted can be formed.

  In this state, when the lock pin 30 is inserted into the body side lock pin insertion hole 25 and the frame side lock pin insertion hole 17, the dump body 20 is held in the standing posture. That is, in the state shown in FIG. 4, in the state where the lock pin 30 is inserted into the hole formed by overlapping the one end side 25a of the body side lock pin insertion hole 25 and the frame side lock pin insertion hole 17, the dump body When 20 tries to return from the standing posture to the lying posture, the dump body 20 tries to rotate counterclockwise in FIG.

  At this time, the body side bracket 24 is rotated about the rotation shaft 22 in the counterclockwise direction of FIG. 4 by the lock pin 30 inserted through the frame side lock pin insertion hole 17 and the body side lock pin insertion hole 25. The movement to move is regulated. Thus, even when the body side lock pin insertion hole 25 is configured as a long hole, the standing posture of the dump body 20 can be maintained, and the dump body 20 is prevented from naturally descending. I can leave.

  Note that the state shown in FIG. 2 shows the lying posture in which the dump body 20 is lowered most, so the lock pin 30 is not used to hold the standing posture. Accordingly, the two lock pins 30 are respectively stored in the lock pin storage holes 26 formed in the vicinity of the body side lock pin insertion hole 25. Further, the lock pin housing hole 26 is formed at a position where the lock pin 30 housed in the lock pin housing hole 26 does not interfere with the frame side bracket 16 even in the standing posture.

  In order to prevent the stored lock pin 30 from falling off, a retaining pin 34 is inserted into the lock pin 30 outside the body side bracket 24. The retaining pin 34 is connected to the body side bracket 24 with a chain or a wire so as not to be lost when not in use.

The lock pin 30 is removed from the lock pin housing hole 26 and inserted into the body side lock pin insertion hole 25 and the frame side lock pin insertion hole 17, or the body side lock pin insertion hole 25 and the frame side lock pin insertion hole. The operation of pulling out the lock pin 30 inserted through 17 and storing it in the lock pin storage hole 26 can be performed by an operator entering between the two lock devices 40 of the dump body.
In order to facilitate the insertion and removal of the lock pin 30, the lock pin 30 is provided with a handle 32.

  As shown in FIGS. 3 and 4, the shape of the long hole of the body side lock pin insertion hole 25 is a linear configuration in which the other end side 25b of the long hole is arranged obliquely upward with respect to the one end side 25a. I can leave. Although not shown, when the dump body 20 is in an upright posture, the other end side 25b of the linear elongated hole is configured in a horizontal or obliquely downward direction with respect to the one end side 25a. It can also be set as

  When the other end side 25b of the straight long hole is arranged horizontally or obliquely downward with respect to the one end side 25a, the long hole is formed by the outer peripheral edge of the frame side bracket 16 with which the lock pin 30 abuts. The outer peripheral edge shape of the frame side bracket 16 can be configured so as to be slid toward the other end side 25b.

  However, when the other end side 25b of the elongated hole is configured to be disposed horizontally or obliquely downward with respect to the one end side 25a, the lateral width of the body side bracket 24 in the longitudinal direction of the vehicle is configured to be wide. Become. On the other hand, when the other end side 25b of the long hole is arranged obliquely upward with respect to the one end side 25a, the lateral width of the body side bracket 24 can be reduced. Therefore, the configuration is desirable in view of the arrangement space of the body side bracket 24 and the like.

  In the first embodiment, an example in which the shape of the long hole of the body side lock pin insertion hole 25 is a straight long hole shape has been described, but in the second embodiment, the shape of the long hole of the body side lock pin insertion hole 28 is described. As shown in FIG. 5 and FIG. 6, an example of an arc-shaped long hole centered on the rotating shaft 22 will be described.

  In Example 1 and Example 2, the shape of the body side lock pin insertion hole is different in that it is configured as a linear long hole shape or an arc-shaped long hole shape. It has a configuration. However, with respect to other configurations, the first and second embodiments have the same configuration. Therefore, the description of the configuration common to the first embodiment in the second embodiment is omitted by using the member symbols used in the first embodiment.

  FIG. 5 is a side view showing the positional relationship between the lock pin and the body side lock pin insertion hole when the dump body is shifted from the lying posture to the standing posture. FIG. 6 is a side view showing the positional relationship between the lock pin and the body side lock pin insertion hole when the dump body is in the standing posture.

  As shown in FIG. 5 and FIG. 6, by configuring the body side lock pin insertion hole 28 as an arc-shaped elongated hole, the lock pin 30 is inserted into the body side lock pin insertion hole 28. Even when the dump body 20 is in a standing posture, the lock pin 30 that is in contact with the outer peripheral edge of the frame side bracket 16 is pushed by the outer peripheral edge of the frame side bracket 16 and is configured as a body side lock configured as an arc-shaped long hole. The inside of the pin insertion hole 28 can be moved smoothly.

  In addition, since the arc-shaped elongated hole is configured as an arc having the rotation shaft 22 as the center of rotation, the lock pin 30 is connected to the circle of the body-side lock pin insertion hole 28 as the dump body 20 rotates. The movement along the arc-shaped slot is smooth.

  When the dump body 20 is in the standing posture, the lock pin 30 can be positioned outside the outer peripheral edge of the frame side bracket 16, and the lock pin 30 may be damaged or the body side bracket 24 or the frame side It is possible to prevent the bracket 16 from being damaged.

  When the dump body 20 is in the standing posture, one end side 28a of the body side lock pin insertion hole 28 is overlapped with the frame side lock pin insertion hole 17, and a hole through which the lock pin 30 is inserted is configured. Can do. Further, at this time, the other end side 28b of the body side lock pin insertion hole 28 can be arranged outside the outer peripheral edge of the frame side bracket 16.

  The dump body locking device according to the present invention can be applied to, for example, a cabin locking device having a tilt mechanism, other locking devices, and the like.

It is an external appearance side view of the dump truck for rough terrain to which the locking device of the dump body concerning the present invention is applied. Example 1 FIG. 2 is a perspective view of the two sets of dump body locking devices arranged in the vicinity of the rotation shaft shown in FIG. 1 as observed from the left rear of the dump truck. Example 1 It is the side view which showed the positional relationship of the lock pin and the body side lock pin insertion hole at the time of shifting a dump body from a lying posture to a standing posture. Example 1 It is the side view which showed the positional relationship of the lock pin and body side lock pin insertion hole when a dump body is made into a standing posture. Example 1 It is the side view which showed the positional relationship of the lock pin and the body side lock pin insertion hole at the time of shifting a dump body from a lying posture to a standing posture. (Example 2) It is the side view which showed the positional relationship of the lock pin and body side lock pin insertion hole when a dump body is made into a standing posture. (Example 2)

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Dump truck, 12 ... Frame, 16 ... Frame side bracket, 17 ... Frame side lock pin insertion hole, 20 ... Dump body, 24 ... Body side bracket, 25 ... -Body side lock pin insertion hole, 28 ... Body side lock pin insertion hole, 30 ... Lock pin, 40 ... Dump body locking device.

Claims (4)

In the dump body lock device that can hold the dump body of the dump truck that is rotatable up and down around the rotation axis between the standing posture and the lying posture, in the standing posture,
A frame-side lock pin insertion hole formed in a frame-side bracket provided on the frame of the dump truck, and drilled in parallel with the rotation shaft;
The body side which is formed in the body side bracket provided in the dump body, and has a hole portion which overlaps with the frame side lock pin insertion hole without interfering with the frame side bracket when the dump body is raised to a standing posture. A lock pin insertion hole,
A lock pin that holds the dump body in the standing posture by inserting between the frame side lock pin insertion hole and the body side lock pin insertion hole during the standing posture of the dump body,
The body side lock pin insertion hole is formed as a long hole, and when the dump body is in a standing posture, one end side of the long hole overlaps the frame side lock pin insertion hole, and the other end side of the long hole is the frame side bracket. A dump body locking device, wherein the dump body lock device is located on an outer side than an outer peripheral edge on the dump body side.   2. The dump body locking device according to claim 1, wherein the elongated hole is formed as a linear elongated hole.   2. The dump body locking device according to claim 1, wherein the elongated hole is formed as an arc-shaped elongated hole centered on the rotation shaft. 3.   The dump pin body according to any one of claims 1 to 3, wherein a lock pin storage hole for storing the lock pin when the lock pin is not used is formed in the body side bracket. Locking device.

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