Work vehicles

Abstract

To provide a work vehicle which can prevent breakage of a lighting device.SOLUTION: A work vehicle comprises a safety frame 30 that comprises left and right frame parts 31L, 31R installed on left and right sides of an airframe 2, and an upper frame part 32 connecting the left and right frame parts 31L, 31R, and that ensures a space and protects an operator during inversion. The left and right frame parts 31L, 31R are provided with lighting devices 35L, 35R respectively in such a manner that upper ends of the lighting devices 35L, 35R are located below the left and right frame parts 31L, 31R, and left and right outer end parts thereof are located inside the left and right frame parts 31L, 31R.SELECTED DRAWING: Figure 3

Description

Technical Field

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[0001] The present invention relates to a work vehicle.

Background Art

[0002] In a tractor as a work vehicle, a configuration is known in which a blinker and a tail lamp are attached to the outside of a safety frame that protects a driver during a fall to ensure visibility (Patent Document 1).

[0003] Also, there is a configuration in which a blinker and a tail lamp are attached to the left and right connecting pipes of a safety frame below the folding position of the foldable safety frame, thereby effectively using the protection space and not interfering with the folding rotation of the safety frame (Patent Document 2).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] According to the tractor shown in Patent Document 1, although visibility can be ensured, in an orchard operation where there are many tree branches and they are lush, there is a risk that the tree branches will contact lighting devices such as blinkers and tail lamps and be damaged.

[0006] Also, according to Patent Document 2, although the risk of damage is reduced, there is a difficulty in visibility.

[0007] The present invention has been made in view of the above, and an object thereof is to provide a work vehicle that can prevent damage to a lighting device even when traveling through a place where tree branches are lush, such as an orchard.

Means for Solving the Problems

[0008] To solve the above-mentioned problems and achieve the objective, the first aspect of the present invention comprises left and right frame sections (31L, 31R) erected on the left and right sides of the machine body (2), and an upper frame section (32) connecting the upper parts of the left and right frame sections (31L, 31R), and includes a safety frame (30) that secures space and protects the driver in the event of a fall, and the upper frame section (32) can be fixed in two positions, an upright position and a fallen position. and the upper end of the safety frame (30) in the aforementioned collapsed position In a work vehicle in which bracket portions (33) are provided at the upper ends of the left and right frame portions (31L, 31R), Located below the bracket portion (33) Lighting devices (35L, 35R) are provided, the upper ends of the lighting devices (35L, 35R) are lower than the upper ends of the left and right frame sections (31L, 31R), and the left and right outer ends are positioned inward from the left and right frame sections (31L, 31R). The front of the lighting device (35L, 35R) is located behind the front of the left and right frame sections (31L, 31R) when viewed from the side, and the rear is located in front of the rear of the left and right frame sections (31L, 31R) when viewed from the side. The lighting devices (35L, 35R) are mounted on the left and right frame sections (31L, 31R) so as to be able to rotate forward and backward around a vertical pivot axis (P). The pivot axis (P) is the pivot axis of a cylindrical holding body (36b) that is fixed to the left and right frame parts (31L, 31R) via a bracket member (36a) whose front surface is located behind the front surface of the left and right frame parts (31L, 31R) in a side view, and whose rear surface is located in front of the rear surface of the left and right frame parts (31L, 31R) in a side view. It is a work vehicle. The first invention related to the present invention is a work vehicle equipped with a safety frame 30 that secures space and protects the driver in the event of an overturn, comprising left and right frame sections 31L and 31R erected on the left and right sides of the machine body 2 and an upper frame section 32 connecting the left and right frame sections 31L and 31R, wherein lighting devices 35L and 35R are provided on the left and right frame sections 31L and 31R respectively, the upper ends of the lighting devices 35L and 35R are lower than the left and right frame sections 31L and 31R, and the left and right outer ends are provided inward from the left and right frame sections 31L and 31R.

[0009] A second invention related to the present invention teeth, First invention related to the present invention In this configuration, the front surfaces of the lighting devices 35L and 35R are located behind the front surfaces of the left and right frame sections 31L and 31R when viewed from the side, and the rear surfaces are located in front of the rear surfaces of the left and right frame sections 31L and 31R when viewed from the side.

[0010] Third invention related to the present invention teeth, First or second invention related to the present invention In this configuration, the lighting devices 35L and 35R are provided so as to be able to rotate forward and backward around a vertical pivot axis P relative to the left and right frame portions 31L and 31R. [Effects of the Invention]

[0011] According to the present invention, the outer ends of the lighting devices 35L and 35R are positioned inward from the left and right frame portions 31L and 31R. As a result, the lighting devices 35L and 35R are installed inside a space formed by a safety frame 30 that has sufficient strength to secure a protective space in the event of a fall. This ensures that the safety frame 30 protects the lighting devices 35L and 35R from contact with tree branches and prevents damage when driving through orchards and other similar environments. First invention related to the present invention According to this, the outer ends of the lighting devices 35L and 35R are positioned further inward than the left and right frame sections 31L and 31R. As a result, the lighting devices 35L and 35R are installed inside a space formed by a safety frame 30 that has sufficient strength to secure a protective space in the event of a fall. This ensures that the safety frame 30 protects the lighting devices 35L and 35R from contact with tree branches and prevents damage when driving through orchards and other similar environments.

[0012] A second invention related to the present invention According to First invention related to the present invention In addition to this effect, even if tree branches extend from the left or right sides while the aircraft is moving, they will hit the outside of the left and right frame sections 31L and 31R, protecting the lighting devices 35L and 35R and reducing the risk of damage.

[0013] Third invention related to the present invention According to First or second invention related to the present invention In addition to the above effect, since the lighting devices 35L and 35R are rotatable around the pivot axis P, even if a tree branch hits the lighting devices 35L or 35R while the machine is moving forward or backward, they can rotate forward or backward to move out of the way and mitigate the impact, thus preventing damage to the lighting devices 35L and 35R. [Brief explanation of the drawing]

[0014] [Figure 1] This is a side view of a tractor according to an embodiment of the present invention. [Figure 2] This is a front view of a tractor according to an embodiment of the present invention. [Figure 3] (A) A rear view showing the support configuration of the lighting device of a tractor according to an embodiment of the present invention, and (B) a top view thereof. [Figure 4] It is a plan view showing the attitude change state of the lighting device of the tractor in the embodiment of the present invention by forward and backward rotation. [Figure 5] It is a plan view of another example in which the lighting device of the tractor in the embodiment of the present invention is displaced backward in the front-rear direction. [Figure 6] (A) It is a rear view showing the support configuration of the lighting device of another example of the tractor in the embodiment of the present invention, and (B) it is a plan view thereof. [Figure 7] It is a plan view showing the attitude change state of the lighting device of another example of the tractor in the embodiment of the present invention by forward and backward rotation.

Embodiments for Carrying Out the Invention

[0015] Hereinafter, the present invention will be described in detail with reference to the drawings.

[0016] As shown in FIGS. 1 and 2, the tractor 1 includes a body 2 having a front wheel 4 provided as a steering wheel and a rear wheel 5 provided as a driving wheel. The power generated by an engine 7 (FIG. 1) mounted in a bonnet 6 at the front part of the body 2 is appropriately decelerated and transmitted to the rear wheel 5 through a main transmission and a sub-transmission not shown, and the rear wheel 5 is driven by this power.

[0017] Further, the tractor 1 can also transmit the power generated by the engine 7 and decelerated by the main transmission and the sub-transmission to the front wheel 4 through a front-wheel speed-up switching mechanism (not shown). When the front-wheel speed-up switching mechanism transmits power, the four wheels of the front wheel 4 and the rear wheel 5 are driven by the power transmitted from the engine 7. When the front-wheel speed-up switching mechanism cuts off the power transmission, only the two wheels of the rear wheel 5 are driven by the power transmitted from the engine 7. That is, the tractor 1 can switch between two-wheel drive and four-wheel drive. In addition, a working machine such as a rotary (not shown) can be mounted on the rear part of the body 2 of the tractor 1, and a PTO output shaft 3 for driving this working machine is provided.

[0018] The aircraft body 2 consists of a transmission case 8 that houses the main transmission, sub-transmission, front wheel speed-increasing switching mechanism, and PTO transmission unit that transmits driving force to the PTO output shaft 3, and a front frame 9 attached to the front of the transmission case 8. The aircraft body 2 has the engine 7 mounted on the rear side of the front frame 9, and the front axle case 15 that houses the transmission mechanism to the front wheels 4 is mounted on the front side of the front frame 9. The engine 7 is covered with a bonnet 6, and the transmission case 8 is installed across the rear of the aircraft body 2. A driver's seat 10 is provided above the rear of the transmission case 8, and fenders 11 for mudguards are provided on both the left and right sides of the driver's seat 10.

[0019] The mudguard fenders 11 are positioned above and in front of the rear wheels 5, and by covering the rear wheels 5, they suppress the scattering of mud kicked up by the rear wheels 5. In other words, the tractor 1 comprises a transmission case 8 that constitutes the machine body 2, a driver's seat 10 located above the rear of the transmission case 8, and mudguard fenders 11 located on both the left and right sides of the driver's seat 10.

[0020] The driver's seat 10 is where the driver sits when operating the tractor 1, and is located between the left and right mudguard fenders 11. In front of the driver's seat 10, as shown in Figures 1 and 2, is a steering wheel 13 used for steering the front wheels 4. The steering wheel 13 is positioned at the upper end of a steering post 14 that rotatably supports the steering wheel 13. Below the steering post 14, that is, near the driver's feet when the driver is seated in the driver's seat 10, are a clutch pedal 20, a brake pedal (not shown) for braking the rear wheels 5 in response to pedal operation, and an accelerator pedal (not shown).

[0021] Furthermore, a work implement lifting lever 27 for raising and lowering work implements such as a rotary tiller (not shown) attached to the rear of the tractor 1 is provided on the right side of the driver's seat 10, and a main transmission lever 25 for operating the main transmission during tractor 1 travel and a sub-transmission lever 26 for the sub-transmission are provided on the left side of the driver's seat 10. The main transmission lever 25 can operate the main transmission, which is the gear shifting of the main transmission, and can be switched between automatic shifting, which is performed automatically, and manual shifting, which is performed at the driver's discretion. In manual shifting mode, the main transmission lever 25 switches the reduction ratio of the main transmission to one of the eight stages. The sub-transmission lever 26 operates the sub-transmission, and the travel speed can be switched between ultra-low speed, low speed, medium speed, high speed, and neutral.

[0022] A safety frame 30 is provided to protect the driver seated in the driver's seat 10 when the vehicle overturns. The safety frame 30 consists of a pair of left and right frame sections 31L and 31R, whose bases are connected to a rear axle case (not shown) that houses the rear wheel axle, etc., and an inverted U-shaped upper frame section 32 that connects the upper parts of the left and right frame sections 31L and 31R, and has a gate-like shape.

[0023] Bracket sections 33 are provided on the left and right frame sections 31L and 31R, respectively, and the upper frame section 32 can be fixed in two positions, an upright position and a reclined position, by changing the position of the connecting pins.

[0024] Lighting devices 35L and 35R are mounted inside the left and right frame sections 31L and 31R. These lighting devices 35L and 35R are combination lamps that integrate the turn signals, taillights, brake lights, etc.

[0025] The details of the mounting configuration of the lighting devices 35L and 35R will be explained using the left lighting device 35L as an example, as shown in Figure 3. A holding part 36 is formed on the upper inside of the left frame part 31L, and the lighting device 35L body is held in this holding part 36 so as to be able to rotate back and forth around the pivot axis (vertical axis) P, with its upper end lower than the left and right frame parts 31L and 31R. That is, a cylindrical holding part body 36b having a vertical axis P is fixed to the inside of the left frame part 31L at an appropriate height via a bracket member 36a to form the holding part 36. The lighting device 35L body is integrally held on the upper part of the pivot shaft 37a by a U-shaped mounting plate 37b and two fastening bolts 37c, and by inserting the pivot shaft 37a into the cylindrical holding part body 36b in the vertical direction, it is held in the holding part 36 so as to be able to rotate around the vertical axis P.

[0026] Furthermore, a recess 36c is provided on the upper surface of the cylindrical holding part body 36b to serve as a seat for a positioning pin 37d that passes through the middle of the pivot shaft 37a. On the other hand, a spring 37f is interposed between a spring seat 37e provided at the lower part of the pivot shaft 37a and the lower surface of the cylindrical holding part body 36b. The biasing force of the spring presses the positioning pin 37d against the recess 36c, restricting rotation and enabling the lighting device 35L body to maintain a predetermined position.

[0027] Furthermore, the recess 36c, which serves as a seat for the positioning pin 37d, is provided in a cross shape in a plan view so that the positioning pin 37d can maintain its orientation at three locations: a predetermined position (angle 0 degrees) and positions where its orientation has been changed forward or backward (angle ±90 degrees) from this predetermined position (Figure 4).

[0028] The front surface 35f of the lighting device 35L is located behind or flush with the front surface 31f of the left frame portion 31L in a side view, and the rear surface 35r is located in front of or flush with the rear surface 31r of the left frame portion 31L in a side view.

[0029] The aforementioned configuration is also provided symmetrically for the right-side lighting device 35R relative to the right-side frame portion 31R.

[0030] With this configuration, the lighting devices 35L and 35R are located inside the left frame sections 31L and 31R, respectively. In other words, the outer ends of the lighting devices 35L and 35R are positioned further inward than the left and right frame sections 31L and 31R. As a result, the lighting devices 35L and 35R are installed inside a space formed by the safety frame 30, which has sufficient strength to secure a protective space in the event of a fall. This ensures that when driving through orchards and other similar environments, the safety frame 30 protects the lighting devices 35L and 35R from contact with tree branches and prevents damage.

[0031] Furthermore, the front surface 35f of the lighting device 35L is positioned behind or flush with the front surface 31f of the left frame section 31L in a side view, and the rear surface 35r is positioned in front of or flush with the rear surface 31r of the left frame section 31L in a side view. Therefore, even if tree branches extend from the left or right sides while the machine is moving, they will hit the outside of the left and right frame sections 31L and 31R, protecting the lighting devices 35L and 35R and reducing the risk of damage. As shown in Figure 5, by replacing the U-shaped mounting plate 37b with a wider mounting plate 37b' so that the lighting device 35L is displaced rearward in the front-rear direction, it is positioned behind the left frame section 31L from directly beside it. This is effective when the machine is primarily working forward.

[0032] Furthermore, since the main body of the lighting device 35L, 35R is rotatable around the pivot axis P of the pivot shaft 37a that integrally supports it, even if a tree branch hits the lighting device 35L, 35R while the machine is moving forward or backward, it can rotate and retract to mitigate the impact, thus preventing damage to the lighting device 35L, 35R.

[0033] Figures 6 and 7 show alternative examples of lighting device 35L and 35R support. In the configurations shown in Figures 3 to 5, the pivot shaft 37a is a cantilevered support configuration, but in Figure 6, a double-support configuration is used to facilitate forward and backward rotation. A vertically elongated bracket portion 40 is provided on the left frame portion 31L, the cylindrical portion 41a of the holding portion 41 is fixed to the lower side of the bracket portion 40, and a short support shaft 41b is fixed to the upper side of the bracket portion 40. The pivot shaft 42b is integrally provided on the U-shaped mounting plate 42a of the lighting device 35L, and a through hole 42c is provided in the upper part of the U-shaped mounting plate 42a that can pass through the support shaft 41b. Thus, the lighting device 35L body is supported by both the upper and lower supports through the passage of the support shaft 41b through the through hole 42c and the insertion of the pivot shaft 42b into the cylindrical portion 41a. The pivot axis 42b is equipped with a positioning pin 42f, a recess 42d, and a spring 42e, similar to those in Figure 3, to enable the lighting device 35L body to maintain a predetermined posture. [Explanation of Symbols]

[0034] 2 units 30 Safety Frame 31L Left frame section 31R Right frame section 32 Upper frame section 35L lighting system 35R Lighting device P rotation axis center

Claims

[Claim 1] In a work vehicle comprising left and right frame sections (31L, 31R) erected on the left and right sides of the machine body (2), and an upper frame section (32) connecting the upper parts of the left and right frame sections (31L, 31R), a safety frame (30) is provided to secure space and protect the driver in the event of a fall, the upper frame section (32) can be changed to two positions, an upright position and a reclined position and fixed, and bracket sections (33) which become the upper end of the safety frame (30) in the reclined position are provided at the upper ends of the left and right frame sections (31L, 31R), respectively, lighting devices (35L, 35R) are provided on the left and right frame sections (31L, 31R) respectively, located below the bracket section (33), the upper ends of the lighting devices (35L, 35R) are below the upper ends of the left and right frame sections (31L, 31R), and the left and right outer ends are provided inward from the left and right frame sections (31L, 31R), The front of the lighting device (35L, 35R) is located behind the front of the left and right frame sections (31L, 31R) in a side view, and the rear is located in front of the rear of the left and right frame sections (31L, 31R) in a side view. The lighting devices (35L, 35R) are mounted on the left and right frame sections (31L, 31R) so as to be able to rotate forward and backward around a vertical pivot axis (P). The pivot axis (P) is the pivot axis of a cylindrical holding body (36b) fixed to the left and right frame parts (31L, 31R) via a bracket member (36a) whose front surface is located behind the front surface of the left and right frame parts (31L, 31R) in a side view, and whose rear surface is located in front of the rear surface of the left and right frame parts (31L, 31R) in a side view.

Images