Work vehicle

Abstract

To provide a work vehicle capable of suppressing loosening of a hydraulic hose part and preventing the hydraulic hose part from abutting an upper surface of a vehicle in a state where a work device (boom) is erected.SOLUTION: A work vehicle 1 is provided with: a vehicle body 3; a work device 14 operated by hydraulic pressure; and hydraulic piping 60 extending from an erecting part 70 provided on the vehicle body 3 and connected to an actuator that drives the work device 14, wherein the hydraulic piping 60 has a hydraulic hose part 64 composed of hydraulic hoses, the vehicle body 3 has a first guide 74 that guides the hydraulic hose part 64, and the first guide 74 is configured to contact a part of the hydraulic hose part 64 and guide the hydraulic hose part 64 so as to extend upward in a state where the work device 14 is erected, thereby providing a gap between the hydraulic hose part 64 and an upper surface of the vehicle body 3.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a work vehicle including a work device operated by hydraulic pressure.

Background Art

[0002] As an example of a work vehicle, a hydraulic excavator, a wheel loader, etc. are conventionally known, which include a lower body to which a crawler or tires for traveling are attached, an upper body disposed on the lower body, and a work device attached to the lower body or the upper body and operated by hydraulic pressure (i.e., hydraulic oil at a predetermined pressure).

[0003] An engine for driving a hydraulic pump is mounted on the upper body, and the pressure oil discharged from the hydraulic pump is supplied to the hydraulic cylinder of the work device through a hydraulic pipe from a control valve. As a component of the hydraulic pipe, a hydraulic hose that can be bent to a certain curvature is widely adopted (see Patent Document 1: Japanese Unexamined Patent Application Publication No. 2019-007254).

[0004] Normally, the hydraulic hose is set to a length dimension with a margin in consideration of the movement of the boom constituting the work device. Therefore, when the boom stands up, the hydraulic hose is in a state of being bent in an S shape in the upper region of the upper body.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the above configuration, since the sag of the hydraulic hose increases as the boom stands up, the hydraulic hose comes into contact with the upper surface of the upper body, resulting in problems such as wear of the hydraulic hose and peeling of the paint on the upper surface of the upper body.

Means for Solving the Problem

[0007] The present invention has been made in view of the above circumstances, and an object thereof is to provide a work vehicle that can suppress the sagging of a hydraulic hose portion when a work device (boom) is in an erected state and prevent the hydraulic hose portion from contacting the upper surface of the vehicle body.

[0008] The present invention solves the above problems by means of solution means as described below in one embodiment.

[0009] A work vehicle according to one embodiment includes a vehicle body, a work device that operates hydraulically, and a hydraulic pipe that extends from a rising portion provided on the vehicle body and is connected to an actuator that drives the work device, and the hydraulic pipe has a hydraulic hose portion formed of a hydraulic hose, the vehicle body has a first guide for guiding the hydraulic hose portion, and the first guide is configured to contact a part of the hydraulic hose portion and guide the hydraulic hose portion to extend upward when the work device is in an erected state, thereby providing a gap between the hydraulic hose portion and the upper surface of the vehicle body.

[0010] According to the above configuration, a first guide for guiding the hydraulic hose portion is provided on the vehicle body to suppress the sagging of the hydraulic hose when the work device is in an erected state and provide a gap between the hydraulic hose portion and the upper surface of the vehicle body. Therefore, it is possible to prevent the hydraulic hose portion from contacting the upper surface of the vehicle body.

[0011] Further, the first guide preferably has a contact surface that contacts the hydraulic hose portion, and the contact surface is formed in a curved surface shape having a bending radius equal to or greater than the minimum bending radius specified for the hydraulic hose.

[0012] Further, the vehicle body preferably has second guides erected at both side positions of the hydraulic hose portion.

[0013] The second guide is preferably composed of a rod-shaped or plate-shaped member having one end attached to the rising portion and the other end attached to the first guide.

[0014] Further, the rising portion preferably has a configuration in which the hydraulic hose portion is raised from the vehicle body by tilting forward at a predetermined angle with respect to the front surface of the vehicle body.

Advantages of the Invention

[0015] According to the work vehicle according to one embodiment, it is possible to provide a work vehicle that suppresses the sagging of the hydraulic hose portion when the work device (boom) is in an upright state and prevents the hydraulic hose portion from contacting the upper surface of the vehicle body.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0017] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic view (perspective view from the upper right front) showing an example of the work vehicle 1 according to this embodiment. For convenience of explanation, in the drawings, the directions of up and down, left and right, and front and back may be indicated by arrows. Also, in all the drawings for explaining the embodiments, members having the same function may be denoted by the same reference numerals, and repeated explanations thereof may be omitted.

[0018] First, the overall configuration of the work vehicle 1 will be described. As shown in FIG. 1, the work vehicle 1 includes a lower body 2 as the vehicle body and an upper body 3 disposed on the lower body 2 (note that the lower body 2 and the upper body 3 may be integrally configured).

[0019] The work vehicle 1 is provided with working devices 12 and 14 attached to the lower body 2 and the upper body 3 and operated by hydraulic pressure (hydraulic oil at a predetermined pressure). The lower body 2 is provided with a traveling device 10 for traveling. The upper body 3 is provided with a main body frame 22 at the lower part. The upper body 3 is provided with a driver's cab 16 in the front part where various operating devices for an operator to board and perform operations such as traveling and working are provided.

[0020] As an example of the traveling device 10, a pair of left and right crawlers 26 is provided. However, the traveling device 10 is not limited to the crawlers 26, and may be configured to include tires instead of the crawlers 26 (not shown). The crawler 26 is driven (traveled) by a traveling hydraulic motor 28.

[0021] As an example of the working device 12, an earth discharging plate 40 is provided. The earth discharging plate 40 is attached to the lower body 2 so as to be swingable up and down (including the front-rear component). The earth discharging plate 40 is driven by a hydraulic cylinder (earth discharging plate cylinder) 50. However, it is not limited to the above configuration.

[0022] As an example of the working device 14, it includes a boom 42, an arm 44, and a detachable attachment (not shown). In FIG. 1, the state where a split boom (two-piece boom) is attached as the boom 42 is illustrated, but it is not limited thereto. Also, there are various types of attachments such as a bucket (service circuit not used), a breaker (one system of service circuit used), a tilt-rotator bucket (two systems of service circuit used), etc., and an appropriate one for the work content is selected and detachably attached to the arm 44. Note that a quick hitch (not shown) may be interposed between the arm 44 and the attachment.

[0023] As a specific configuration, the boom 42 is attached to the upper body 3 so as to be swingable vertically (including the front-rear component) (note that as another example, a configuration (not shown) in which a boom bracket is provided between the upper body 3 and the boom 42 may be used). The arm 44 is attached to the boom 42 so as to be swingable vertically (including the front-rear component). The attachment is attached to the arm 44 so as to be swingable vertically (including the front-rear component). The boom 42 is driven by a hydraulic cylinder (boom cylinder) 52. The arm 44 is driven by a hydraulic cylinder (arm cylinder) 54. The attachment is driven by a hydraulic cylinder (bucket cylinder) 56. However, it is not limited to the above configuration.

[0024] The driving mechanism for driving the above-mentioned traveling hydraulic motor 28 and each hydraulic cylinder is, for example, composed of a hydraulic pump (such as a main hydraulic pump) driven by a driving source, a control valve, etc. (all not shown). When the operator operates a predetermined operating device, the control valve is actuated to control the supply of hydraulic oil at a predetermined pressure sent from the hydraulic pump to the traveling hydraulic motor 28 and each hydraulic cylinder. Thereby, the traveling by the traveling device 10 and the work by the work devices 12 and 14 can be performed. One or a plurality of hydraulic pumps constituting the driving mechanism are provided according to the configurations and loads of the work devices 12 and 14 and the traveling device 10. The control valve and the hydraulic pump are mounted on the upper body 3.

[0025] Further, the work vehicle 1 is provided with an engine (specific examples include a diesel engine, a gasoline engine, etc.) that burns fuel (specific examples include light oil, gasoline, etc.) as the above-mentioned driving source. Note that a configuration including an electric motor together with the engine (so-called hybrid system) may also be adopted (not shown).

[0026] The work vehicle 1 also has a hydraulic pipe 60 that connects the control valve and each actuator to supply and discharge hydraulic oil. Specific examples of the hydraulic pipe 60 include a pipe connected to the arm cylinder 54, a pipe connected to the bucket cylinder 56, a pipe connected to a service actuator (not shown), and a pipe connected to a shut-off valve (not shown). Here, FIG. 2 is a perspective view showing the hydraulic pipe 60 of the work vehicle 1.

[0027] As shown in FIGS. 1 and 2, the hydraulic piping 60 extends from the control valve, rises from the inside to the outside of the upper body 3 through a rising portion 70 provided above the front portion of the upper body 3, and is attached along the working device 14. The piping portion 62 from the control valve to the rising portion 70 is composed of a steel pipe, and the piping portion 64 from the rising portion 70 to a connection portion 72 provided at a preset position of the boom 42 is composed of a flexible hydraulic hose (hereinafter, the piping portion 64 may be referred to as the "hydraulic hose portion 64"), and the piping portion 66 from the connection portion 72 to each actuator is composed of a steel pipe and a hydraulic hose (however, a configuration in which a hydraulic hose is directly connected from the control valve to each actuator may also be used). In this way, by configuring the portion between the rising portion 70 and the connection portion 72 with a flexible hydraulic hose, the swinging of the working device 14 (boom 42) is allowed. The hydraulic hose is formed using a synthetic rubber with an oil-resistant inner layer, a steel wire as a reinforcing layer covering the outer periphery of the inner layer, and a synthetic rubber with weather and abrasion resistance as the outer layer. The steel pipe is formed using a steel material with oil resistance.

[0028] The hydraulic hose portion 64 is set to a length dimension that does not generate a tensile load during the operation of the boom 42. Specifically, it is set to a length dimension with a margin based on the state where the boom 42 is in the most collapsed state (the state where the rising portion 70 and the connection portion 72 are the most separated). Therefore, when the boom 42 stands up, the hydraulic hose portion 64 is in a state of being curved in an S shape in the upper region of the upper body 3. Here, FIG. 3 is a perspective view of the hydraulic hose portion 64. FIG. 4A is a side view showing the state where the boom 42 is collapsed, and FIG. 4B is a side view showing the state where the boom 42 is standing up. Reference numeral 64a in FIGS. 3 and 4B indicates a first curved portion where the hydraulic hose portion 64 protrudes upward from the rising portion 70, and reference numeral 64b indicates a second curved portion where the hydraulic hose portion 64 protrudes downward (hangs down) from the rear end of the first curved portion 64a.

[0029] Here, the upper body 3 is provided at a position behind the rising portion 70 and has a first guide 74 for guiding the hydraulic hose portion 64. Specifically, when the boom 42 is in the erected state, the first guide 74 contacts the first bent portion 64a and guides the hydraulic hose portion 64 to extend upward, thereby suppressing the sag of the second bent portion 64b and having the effect of providing a gap A between the second bent portion 64b and the upper surface of the upper body 3 (see FIG. 4B). Thereby, it is possible to prevent the hydraulic hose portion 64 from coming into contact with the upper surface of the upper body 3. Therefore, it is possible to prevent wear of the hydraulic hose portion 64 and peeling of the paint on the upper surface of the upper body 3.

[0030] However, in the hydraulic hose portion 64, hydraulic hose sets 64A, 64B, 64C, 64D, 64E, and 64F in which a plurality of hydraulic hoses are arranged side by side in the left - right direction are formed, and the hydraulic hose sets 64A, 64B, 64C, 64D, 64E, and 64F are arranged in layers. Therefore, when the boom 42 is in the erected state, a hydraulic hose set (as an example, the hydraulic hose set 64A) extending from a position closer to the center of the vehicle body of the rising portion 70 is pressed by other hydraulic hose sets, and there is a possibility that the first bent portion 64a becomes smaller than the minimum bending radius specified for the hydraulic hose.

[0031] To address this problem, the first guide 74 has a contact surface 74b that contacts the hydraulic hose portion 64, and the contact surface 74b is formed in a curved - surface shape having a bending radius equal to or greater than the minimum bending radius specified for the hydraulic hose. Thereby, since the hydraulic hose portion 64 is guided (supported from below) by the first guide 74 along the contact surface 74b, it is possible to prevent the first bent portion 64a from becoming smaller than the minimum bending radius specified for the hydraulic hose. As a configuration example of the first guide 74, as shown in FIG. 5, frames 74a that are erected on the upper surface of the upper body 3 (specifically, the frame 24 attached to the main body frame 22) and constitute both side portions of the first guide 74, a contact surface 74b that is installed between the frames 74a, and an attachment portion 74c to which one end of a second guide 76 described later is attached are provided.

[0032] Further, the upper body 3 has second guides 76 erected on both side positions of the hydraulic hose portion 64. Thereby, when the boom 42 is in the erected state, it is possible to prevent the hydraulic hose sets 64A, 64B, 64C, 64D, 64E, and 64F stacked along the contact surface 74b from spreading in the left - right direction. Therefore, it is possible to configure the neat hydraulic piping 60 without impairing the appearance. Also, it is possible to prevent the hydraulic hose portion 64 from swinging in the left - right direction during work or the like and interfering with the boom cylinder 52 or the like. As a configuration example of the second guide 76, as shown in FIG. 6, it includes a pair of left - and - right rod - shaped frames 76a, one end (attachment portion 76b) of which is attached to the rising portion 70 and the other end (attachment portion 76c) of which is attached to the first guide 74. Note that the frame 76a may be a plate - shaped member or the like in addition to the rod - shaped member.

[0033] Further, the rising portion 70 is configured to raise the hydraulic hose portion 64 from the upper body 3 with the hydraulic hose portion 64 being tilted forward by a predetermined angle with respect to the front of the upper body 3. In the present embodiment, this configuration is realized by providing the rising portion 70 with a predetermined angle of forward tilt with respect to the upper surface of the upper body 3 (see FIG. 4A). Thereby, the length dimension of the hydraulic hose portion 64 when the boom 42 is in the most collapsed state can be shortened (that is, optimized). Therefore, the sag of the second bent portion 64b can be further suppressed. Also, it is possible to reduce the manufacturing cost. In the present embodiment, the predetermined angle θ is set to 20[°], but it is not limited to this.

[0034] As described above, according to the above work vehicle, it is possible to provide a work vehicle that suppresses the sag of the hydraulic hose portion when the work device (boom) is in the erected state and prevents the hydraulic hose portion from contacting the upper surface of the vehicle body.

[0035] The present invention is not limited to the above - described embodiment (hydraulic excavator). The present invention can be similarly applied to a work vehicle (such as a wheel loader) in which the upper body does not swing with respect to the lower body.

Explanation of reference numerals

[0036] 1 Working vehicle 2 Lower body 3 Upper body 12, 14 Working device 42 Boom 44 Arm 52 Hydraulic cylinder (boom cylinder) 54 Hydraulic cylinder (arm cylinder) 56 Hydraulic cylinder (bucket cylinder) 60 Hydraulic piping 64 Hydraulic hose section 74 First guide 76 Second guide A Gap

Claims

1. A work vehicle comprising a vehicle body, a working device actuated by hydraulic pressure, and a hydraulic pipe extending from a rising portion provided on the vehicle body and connected to an actuator that drives the working device, wherein the hydraulic pipe has a hydraulic hose portion composed of a hydraulic hose, the vehicle body has a first guide for guiding the hydraulic hose portion, the first guide is configured to provide a gap between the hydraulic hose portion and the upper surface of the vehicle body by contacting a part of the hydraulic hose portion and guiding the hydraulic hose portion to extend upward when the working device is in an upright state. A work vehicle characterized by the above.

2. The first guide has a contact surface that contacts the hydraulic hose portion, the contact surface is formed in a curved surface shape having a bending radius equal to or greater than the minimum bending radius specified for the hydraulic hose. The work vehicle according to claim 1, characterized by the above.

3. The vehicle body has a second guide erected at both side positions of the hydraulic hose portion. The work vehicle according to claim 1 or claim 2, characterized by the above.

4. The second guide is composed of a rod-shaped or plate-shaped member having one end attached to the rising portion and the other end attached to the first guide. The work vehicle according to claim 3, characterized by the above.

5. The rising portion is configured to rise from the vehicle body by tilting the hydraulic hose portion forward at a predetermined angle with respect to the front of the vehicle body. The work vehicle according to claim 4, characterized by the above.

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