Work vehicles

Abstract

To provide a work vehicle capable of facilitating operation of a lock pin to lock a rotation of an upper body, and preventing loss or theft of the lock pin.SOLUTION: A work vehicle 1 includes: a lower body 2 on which a traveling device 10 is attached; an upper body 3 rotatably arranged on the lower body 2; a work device 4 attached on the upper body 3 and moving through hydraulic pressure; and a lock pin 5 locking the rotation of the upper body 3. For the lock pin 5, as a column-like part 6 is swingably held on a receiving part 15 in a vertical direction, operating an operation part 7 in a state a first end part 7a is inserted in a guide groove 8 allows switching between lock of the rotation of the upper body 3 and lock release of the rotation of the upper body 3.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a work vehicle equipped with a hydraulically operated working device. [Background technology]

[0002] BACKGROUND ART Conventionally, excavators, self-propelled cranes, and the like are known which include a lower body to which running wheels or crawlers are attached, an upper body rotatably disposed on the lower body, and a hydraulically operated working device attached to the lower body or the upper body.

[0003] The above-mentioned work vehicle is provided with a lock pin that locks the upper body from rotating when the vehicle is self-propelled. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 9-058982 Summary of the Invention [Problem to be solved by the invention]

[0005] For example, Patent Document 1 (JP Patent Publication No. 9-058982) discloses a lock pin that locks the rotation of an upper body. However, there is a problem in that it is difficult to operate the lock pin with a wire. In addition, there is a problem in that the wire attached to the lock pin can break, and there is a risk that a lock pin with a broken wire or a lock pin without a wire can be lost or stolen. [Means for solving the problem]

[0006] The present invention has been made in consideration of the above circumstances, and aims to provide a work vehicle that is configured so that a lock pin that locks the rotation of the upper body can be easily operated and that can prevent the lock pin from being lost or stolen.

[0007] In one embodiment, the above problem is solved by the solution disclosed below.

[0010] The work vehicle according to the present invention comprises a lower body to which a traveling device is attached, an upper body rotatably disposed on the lower body, a working device attached to the upper body and actuated by hydraulic pressure, and a lock pin that locks the rotation of the upper body; the lower body has running wheels, the upper body has a cockpit, and the lock pin is provided in front of the cockpit, the lock pin has a pillar-shaped portion and an operating portion disposed on the pillar-shaped portion, the lower body has a stopper provided at a position engageable with the pillar-shaped portion, and the upper body has a guide groove into which a first end of the operating portion is inserted, The guide groove is Extends up and down A first groove, a second groove extending leftward from the upper end of the first groove, and a third groove extending downward from the left end of the second groove. The upper body has a receiving portion extending forward, and the lock pin is held by the receiving portion so that the columnar portion can slide up and down, and by operating the operating portion with the first end inserted in the guide groove, it is possible to switch between locking the rotation of the upper body and unlocking the rotation of the upper body. It is a composition Characterized by . This configuration allows for easy maintenance when traveling on public roads, and the state of the lock pin can be visually confirmed from the driver's seat. Furthermore, when the upper body is unlocked from rotation, the lock pin is locked in the third groove, preventing the lock pin from coming loose due to vibrations caused by the operation of the work equipment.

[0011] As an example, the operating portion has a joint portion fixed to the columnar portion, the first end portion extending from the rear side of the joint portion, an upright portion bent upward from the front side of the joint portion, and a handle portion bent and extending from the upper side of the upright portion, wherein a first axis passing through the center of the columnar portion in the up-down direction intersects or is perpendicular to a second axis passing through the center of the joint portion in the longitudinal direction of the joint portion. This configuration allows for a lock pin with a handle portion that is easy for an operator to grip and operate.

[0012] For example, the upper body includes a guide plate, the guide plate being arranged along the guide groove, protruding forward from the guide plate, and including a rib portion that prevents the first end from disengaging from the guide groove. The first axis intersects or is perpendicular to a third axis that passes through the center of the third groove in the depth direction of the guide groove when the upper body is locked in rotation. According to this configuration, the guide plate having the rib portion can reduce the thickness of the guide plate, thereby achieving weight reduction. Furthermore, the rib portion guides the operating element, allowing for smooth operation of the operating element. For example, the upper body includes a frame or a cover, and the guide plate is attached and fixed to the frame or the cover. This allows the upper body to easily include a guide groove, and the position of the guide groove provided in the upper body to be easily adjusted.

[0013] The work vehicle of the present invention comprises a lower body to which a traveling device is attached, an upper body rotatably disposed on the lower body, a working device attached to the upper body and hydraulically operated, and a lock pin that locks the rotation of the upper body, the lock pin having a pillar-shaped portion and an operating portion disposed on the pillar-shaped portion, the lower body having a stopper disposed at a position engageable with the pillar-shaped portion, the upper body having a guide groove into which a first end of the operating portion is inserted, the guide groove having a first groove extending vertically and a second groove extending left and right or front and rear from an upper end of the first groove, the upper body having a receiving portion extending forward, the pillar-shaped portion of the lock pin being held in the receiving portion so as to be slidable in the vertical direction, and by operating the operating portion with the first end inserted in the guide groove, it is possible to switch between locking the rotation of the upper body and unlocking the rotation of the upper body, The receiving portion has a cylindrical portion extending in the vertical direction, and the columnar portion is passed through a through hole formed in the cylindrical portion. The operating portion has buffer portions arranged at predetermined intervals, and is configured so that when the rotation of the upper body is locked, the buffer portions come into contact with the upper surface of the cylindrical portion, and when the rotation of the upper body is unlocked, the buffer portions and the upper surface of the cylindrical portion are separated. Characterized by . This configuration stabilizes the vertical movement of the columnar part. In addition, the buffer part comes into contact with the top surface of the cylindrical part when the upper body is locked in place, mitigating vibrations and shocks during locking, allowing for smooth operation of the operating part. [Effects of the Invention]

[0014] According to the present invention, a work vehicle is realized in which the lock pin that locks the rotation of the upper body can be easily operated and the lock pin can be prevented from being lost or stolen. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a schematic perspective view showing an example of a work vehicle according to an embodiment of the present invention. [Figure 2] FIG. 2 is a schematic perspective view showing an enlarged arrangement of lock pins in the work vehicle of FIG. [Figure 3] FIG. 3 is a schematic perspective view showing an enlarged arrangement of the lock pins in FIG. [Figure 4] FIG. 4 is an enlarged perspective view showing a state in which the rotation of the upper body of the working vehicle of FIG. 1 is locked. [Figure 5] FIG. 5 is an enlarged perspective view showing a schematic view of the working vehicle of FIG. 1 with the upper body unlocked from rotation. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic perspective view showing an example of a work vehicle 1 according to this embodiment. FIG. 2 is a schematic perspective view showing an enlarged view of the arrangement of lock pins 5 in the work vehicle 1. FIG. 3 is a schematic perspective view showing an even enlarged view of the arrangement of lock pins 5 in the work vehicle 1. For ease of explanation, arrows may be used in the drawings to indicate up / down, left / right, and front / rear directions. In all drawings used to explain the embodiment, members having the same functions are designated by the same reference numerals, and repeated explanations of such members may be omitted.

[0017] First, the overall configuration of the work vehicle 1 will be described. An excavator equipped with running wheels 17 will be used as an example of the work vehicle 1. However, the work vehicle 1 is not limited to this configuration.

[0018] As shown in FIG. 1, the work vehicle 1 has an underbody 2 to which a traveling device 10 is attached. The work vehicle 1 has an upper body 3 that is disposed on the underbody 2 so as to be able to rotate via a slewing bearing. The work vehicle 1 has a hydraulically operated working device 4 that is attached to the upper body 3. The work vehicle 1 has a hydraulically operated working device 24 that is attached to the underbody 2. The upper body 3 has a control room 16 at the front where an operator rides and controls driving and work. The control room 16 is, for example, a cabin, and for example, a canopy.

[0019] An example of the traveling device 10 is equipped with four traveling wheels 17, two at the front and two at the back. The traveling wheels 17 have wheels 17A with tires 17B fitted around the outer periphery thereof. The traveling wheels 17 are, for example, single tires, and for example, double tires. However, the traveling device 10 is not limited to the traveling wheels 17. As a modified example, the work vehicle 1 may be configured to have crawlers (not shown) instead of the traveling wheels 17.

[0020] The traveling wheels 17 are driven by a traveling hydraulic motor (not shown). The traveling hydraulic motor is operated by hydraulic pressure. A hydraulic pump (not shown) that generates the hydraulic pressure is disposed in the upper body 3. The hydraulic pump is driven by a drive source. That is, the traveling device 10 operates by receiving pressurized oil delivered from the hydraulic pump.

[0021] The working implement 4 is equipped with attachments such as a boom, arm, and bucket, each of which is driven by a hydraulic cylinder. The working implement 24 is equipped with a blade and is driven by a hydraulic cylinder. The front of the vehicle may be equipped with outriggers, which are also driven by hydraulic cylinders. However, these working implements 4, 24 are not limited to the above configurations.

[0022] Each of the hydraulic cylinders described above is operated by hydraulic pressure. A hydraulic pump (not shown) that generates the hydraulic pressure is disposed on the upper body 3. The hydraulic pump is driven by a drive source. That is, the working devices 4 and 24 described above are operated by receiving pressurized oil delivered from the hydraulic pump. Note that other mechanisms for travel and work in the work vehicle 1 according to this embodiment are similar to those of known excavators, and therefore detailed explanations will be omitted.

[0023] The work vehicle 1 according to this embodiment is configured to be self-propelled on public roads, and is equipped with a pair of left and right headlights 18 that incorporate light sources such as LEDs or light bulbs to illuminate the road ahead, and a pair of turn signals 19 that provide illumination for indicating left and right directions. As an example, both the headlights 18 and the turn signals 19 are round in shape when viewed from the front.

[0024] As shown in area G surrounded by a dashed line in Figure 1, the work vehicle 1 is equipped with a lock pin 5 that locks the rotation of the upper body 3. As an example, the lock pin 5 is provided on the left side of the boom bracket 4a, and is provided in a position where the state of the lock pin 5 can be seen from the operator's compartment 16.

[0025] As shown in Figures 2 and 3, the lock pin 5 has a columnar portion 6 that extends vertically and an operating portion 7 that is disposed on top of the columnar portion 6. The operating portion 7 has a bent rod or plate shape and is attached and fixed to the columnar portion 6. A first end 7a of the operating portion 7 is inserted into a guide groove 8, and the operating portion 7 has a handle portion 7b that extends upward on the front side, opposite the first end 7a, toward the guide plate 15. A second end 7c of the handle portion 7b is disposed near the guide plate 15 and away from the guide groove 8. As an example, the lock pin 5 and the operating portion 7 are made of hard metal.

[0026] The operating unit 7 includes a joint 7d fixed to the columnar portion 6, a first end 7a extending from the rear side of the joint 7d, a standing portion 7f bent upward from the front side of the joint 7d, and a handle portion 7b extending from the upper side of the standing portion 7f. A first axis P1 passing through the center of the columnar portion 6 in the vertical direction intersects or is perpendicular to a second axis P2 passing through the center of the joint 7d in the longitudinal direction of the joint 7d. This configuration allows the lock pin 5 to have a handle portion 7b that is easy for an operator to grip and operate. For example, when the upper body 3 is locked from rotation, the first axis P1 is perpendicular to the second axis P2. For example, when the upper body 3 is unlocked from rotation, the first axis P1 is perpendicular to the second axis P2.

[0027] A stopper 11 is provided on the upper surface of the lower body 2 at a position where it can engage with the columnar portion 6. As an example, the stopper 11 is in the shape of a block made of hard metal, and is formed with a recess 11a into which the lower portion of the columnar portion 6 is inserted. Alternatively, the stopper 11 may be in the shape of a column or cylinder, with a recess into which the lower portion of the columnar portion 6 is inserted. Alternatively, the stopper 11 may be formed by intersecting a pair of upright plates or blocks to form a cross shape in which the lower portions of the columnar portion 6 come into contact. Note that the stopper 11 is not limited to the above configuration.

[0028] The upper body 3 has a guide groove 8 into which the first end 7a of the operating unit 7 is inserted. As an example, the upper body 3 has a frame 13, and a guide plate 15 is attached and fixed to the frame 13 with bolts 15d. As an example, the guide plate 15 is made of hard metal. The guide plate 15 is configured with a through-hole machined to become the guide groove 8 when attached to the frame 13, or is configured with a guide groove 8 that has been machined in advance. This configuration makes it easy to position the guide groove 8.

[0029] The guide plate 15 has a guide groove 8 and a rib portion 14. The guide groove 8 has a first groove 8a extending upward, a second groove 8b extending leftward from the upper end of the first groove 8a, and a third groove 8c extending downward from the left end of the second groove 8b, forming a hook shape in a front view. When the upper body 3 is locked in a rotational state, the first axis P1 intersects or is perpendicular to a third axis P3 that passes through the center of the third groove 8c in the width direction of the guide groove 8. The rib portion 14 is disposed along the guide groove 8, protrudes forward from the guide plate 15, and prevents the first end 7a from coming off the guide groove 8. This configuration allows the guide plate 15 to be thin and lightweight. Furthermore, the rib portion 14 guides the operating unit 7, allowing for smooth operation of the operating unit 7. As an example, when the upper body 3 is locked in rotation, the first axis P1 is configured to be perpendicular to the third axis P3. As an example, when the upper body 3 is unlocked in rotation, the first axis P1 is configured to intersect with the third axis P3.

[0030] The upper body 3 has a receiving portion 9 that extends forward from the underside of the operator's compartment 16. The receiving portion 9 functions as a swing stopper that prevents the working device 4 from swinging, and also functions as a support portion that supports the working device through the columnar portion 6. In other words, the lock pin 5 also serves as a swing stopper as the receiving portion 9, resulting in a rational configuration.

[0031] The receiving part 9 is an integral structure to which a cylindrical part 12 extending vertically is attached, and the columnar part 6 is slidably passed through a through hole 12a formed in the cylindrical part 12. As an example, the receiving part 9 and the cylindrical part 12 are made of a hard metal. Here, the total length of the columnar part 6 is set to be greater than the total length of the cylindrical part 12, and the total length of the cylindrical part 12 is set to be greater than the thickness of the receiving part 9.

[0032] In this embodiment, a first axis P1 passing through the center of the pillar portion 6 in the longitudinal direction is perpendicular to the ground surface of the work vehicle 1, and the operating unit 7, pillar portion 6, and stopper 11 are arranged along the first axis P1 in this order from top to bottom. The operating unit 7 has buffer portions 7e arranged on both longitudinal sides of the joint portion 7d. The buffer portions 7e are made of an elastic material such as resin, elastomer, or rubber. As an example, the buffer portions 7e are cylindrical or block-shaped. When the upper body 3 is locked in rotation, the buffer portions 7e contact the upper surface 12b of the tubular portion 12. When the upper body 3 is unlocked in rotation, the buffer portions 7e move away from the upper surface 12b of the tubular portion 12.

[0033] The pillar-shaped portion 6 can slide through the through-hole 12a until the buffer portion 7e contacts the top surface 12b of the cylindrical portion 12, and has a size and weight that allows it to lock the rotation of the upper body 3 by mating with the recess 11a of the stopper 11. The stopper 11 is partially cut away in a direction perpendicular to the rotation direction of the upper body 3 and perpendicular to the first axis P1, exposing the lower part of the pillar-shaped portion 6. This configuration makes it easy to adjust the positions of the lock pin 5 and the stopper 11 more accurately.

[0034] FIG. 4 is an enlarged perspective view showing a schematic state in which the upper body 3 of the work vehicle 1 is locked from swinging. As a preliminary step before driving on a public road, the operator operates the handle portion 7b to mechanically lock the swing of the upper body 3 relative to the lower body 2. The operator moves the first end portion 7a along the guide groove 8 from the third groove 8c via the second groove 8b to the lower end of the first groove 8a. This causes the columnar portion 6 to slide under its own weight until the buffer portion 7e contacts the upper surface 12b of the cylindrical portion 12, and the lower portion of the columnar portion 6 is inserted and held in the recess 11a of the stopper 11. This mechanically locks the swing of the upper body 3.

[0035] FIG. 5 is an enlarged perspective view showing a schematic state in which the upper body 3 of the work vehicle 1 has been unlocked from rotation. For example, when performing excavation work using the work implement 4, the operator operates the handle portion 7b as a preliminary step to unlock the mechanical lock on the rotation of the upper body 3. The operator moves the first end portion 7a along the inside of the rib portion 14 while keeping it inserted in the guide groove 8 from the first groove 8a through the second groove 8b to the lower end of the third groove 8c. This causes the columnar portion 6 to slide under its own weight until the first end portion 7a contacts the lower end of the third groove 8c, and the first end portion 7a is inserted and held in the lower end of the third groove 8c. This releases the mechanical lock on the rotation of the upper body 3, and the lock pin 5 is held in the lower end of the third groove 8c.

[0036] According to this embodiment, the work vehicle 1 is configured in such a way that the lock pin 5, which switches between locking the rotation of the upper body 3 and unlocking the rotation of the upper body 3, can be easily operated, and the lock pin 5 can be prevented from being lost or stolen.

[0037] The specifications of the above-described work vehicle 1 may be modified as appropriate to suit the specifications, etc. The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the scope of the present invention. [Explanation of symbols]

[0038] 1. Work vehicles 2 Lower body 3. Upper body 4 Work equipment, 4a Boom bracket 5 Locking pin 6 Columnar part 7 Operation section, 7a first end, 7b handle section, 7c second end, 7d joint section, 7e buffer section, 7f standing section 8 guide groove, 8a first groove, 8b second groove, 8c third groove 9 Receiving part 10 Running gear 11 stopper, 11a recess 12 cylindrical portion, 12a through hole, 12b upper surface 13 Front cover 14 Rib section 15 Guide plate 16 Cockpit 17 Running wheel 18 Headlight 19. Turn signal 24 Work equipment P1 1st axis P2 2nd axis

Claims

1. The vehicle comprises a lower body to which a traveling device is attached, an upper body rotatably disposed on the lower body, a working device attached to the upper body and actuated by hydraulic pressure, and a lock pin for locking the rotation of the upper body, The lower body has running wheels, the upper body has a cockpit, The lock pin is provided in front of the cockpit, The lock pin has a pillar portion and an operating portion disposed on the pillar portion, The lower body is provided with a stopper at a position where the stopper can be engaged with the columnar portion, the upper body has a guide groove for receiving a first end of the operating part, the guide groove includes a first groove extending vertically, a second groove extending leftward from an upper end of the first groove, and a third groove extending downward from a left end of the second groove, The upper body has a receiving portion extending forward, The lock pin is configured such that the columnar portion is held by the receiving portion so as to be slidable in the vertical direction, and by operating the operating portion with the first end portion inserted in the guide groove, it is possible to switch between locking the rotation of the upper body and unlocking the rotation of the upper body. A work vehicle characterized by:

2. the operating portion has a joint portion fixed to the columnar portion, the first end portion extending from a rear side of the joint portion, an upright portion extending upward by bending a front side of the joint portion, and a handle portion extending from an upper side of the upright portion by bending, A first axis passing through the center of the columnar portion in the vertical direction intersects or is perpendicular to a second axis passing through the center of the joint in the longitudinal direction of the joint.

2. The work vehicle according to claim 1,

3. The upper body has a guide plate, the guide plate is disposed along the guide groove, and has a rib portion that protrudes forward of the guide plate and prevents the first end from coming out of the guide groove; The first axis is configured to intersect or be perpendicular to a third axis that passes through the center of the third groove in the width direction in the depth direction of the guide groove when the upper body is locked in rotation.

3. The work vehicle according to claim 2, wherein:

4. The vehicle comprises a lower body to which a traveling device is attached, an upper body rotatably disposed on the lower body, a working device attached to the upper body and actuated by hydraulic pressure, and a lock pin for locking the rotation of the upper body, The lock pin has a pillar portion and an operating portion disposed on the pillar portion, The lower body is provided with a stopper at a position where the stopper can be engaged with the columnar portion, the upper body has a guide groove for receiving a first end of the operating part, The guide groove has a first groove extending vertically and a second groove extending left and right or front and rear from an upper end of the first groove, The upper body has a receiving portion extending forward, The lock pin is held by the receiving portion so that the columnar portion can slide up and down, By operating the operating unit with the first end portion inserted in the guide groove, it is possible to switch between locking the rotation of the upper body and unlocking the rotation of the upper body, the receiving portion has a cylindrical portion extending in the up-down direction, and the columnar portion is inserted into a through hole formed in the cylindrical portion, The operation unit has buffer sections arranged at predetermined intervals, When the upper body is locked in rotation, the buffer portion and the upper surface of the cylindrical portion are in contact with each other, and when the upper body is unlocked in rotation, the buffer portion and the upper surface of the cylindrical portion are separated from each other. A work vehicle characterized by:

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