Work vehicle
The adjustable door damper system in work vehicles addresses the issue of door damage from auxiliary wheels and overhead obstructions by allowing the swing limit of the door to be set, ensuring safe and damage-free operation.
Patent Information
- Application Number
- JP2023209667
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-12-12
- Publication Date
- 2025-06-24
Smart Images
Figure 2025093791000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a work vehicle.
Background Art
[0002] For example, as shown in Patent Document 1, there is a work vehicle (tractor) including a driver's cab (riding cab) formed on a traveling body and a cabin provided in the driver's cab. The cabin has a door (door panel) swingably connected to the cabin body.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] Examples of the door swingably provided in the cabin of the work vehicle include a door for opening and closing the entrance of the cabin body, so-called an entrance door, and a door swingably connected to the rear part of the cabin body, so-called a rear window door. Conventionally, in a work vehicle having an entrance door, when auxiliary wheels such as inversion stroke wheels or basket type wheels are attached to the wheels, if the door is opened without being aware of the auxiliary wheels, the door may hit the auxiliary wheels and damage the door. Also, in a work vehicle having a rear window door, if the door is opened without being aware of an upper object such as a low ceiling in a storage, the door may hit the upper object and damage the door.
[0005] The present invention provides a work vehicle capable of suppressing damage to the door.
Means for Solving the Problems
[0006] The work vehicle according to the present invention is A traveling body, a driver's cab formed on the traveling body, a cab provided in the driver's cab and having a cab body and a door swingably connected to the cab body, and a door damper connected to the door and the cab body and setting a swing limit on the opening side of the door. At least one of the door and the cab body has a connecting portion at a plurality of locations where the door damper can be detachably attached. The door damper changes the swing limit of the door by changing and connecting the connecting portion at the plurality of connecting portions.
[0007] According to this configuration, by changing and connecting the connecting portion of the door damper at a plurality of connecting portions, the swing limit on the opening side of the door is changed and set by the door damper. Therefore, the opening angle of the door when the door is opened to the swing limit, that is, the maximum swing angle on the opening side can be changed and set. By being able to change and set the maximum swing angle on the opening side, in normal cases, the maximum swing angle can be made large and the door can be opened wide. However, in special cases, by setting the maximum swing angle to a small angle in advance, the swing of the door is restricted and the door can only be opened smaller than in normal cases, and the door will not hit auxiliary wheels or upper objects. That is, according to this configuration, damage to the door can be suppressed. It is also possible to change the connection position of the door damper by preparing a plurality of connecting members each having a damper connection point replacing each of the plurality of connecting portions, selecting an appropriate connecting member from the plurality of connecting members, and connecting the selected connecting member to the cab body or the door. On the other hand, according to this configuration, since it is only necessary to detach and attach the door damper to the connecting portions formed at a plurality of locations, the connection position of the door damper can be easily changed.
[0008] In the present invention, It is preferable that the plurality of connecting portions are formed on the cab body of the cab body and the door.
[0009] According to this configuration, since the door damper is attached and detached to and from the cabin body where it is easier to secure a wider working space than configuring to attach and detach the door damper at the door, it is easier to change the connection position of the door damper.
[0010] In the present invention, in the above configuration, It is preferable that the door damper has a rod portion and a cylinder portion, and the rod portion has a biasing force toward the side where it protrudes and extends with respect to the cylinder portion.
[0011] According to this configuration, when the door is opened, the door damper extends by the biasing force. Since the door damper reaches the connecting portion of the cabin body without the trouble of manually extending the door damper, furthermore, the door damper can be attached and detached to and from the connecting portion of the cabin body while securing a wider working space, so it is easier to change the connection position of the door damper.
[0012] In the present invention, It is preferable that the door is a door that opens and closes the entrance of the cabin body in a state where it can swing with a pivot axis extending in the vertical direction as a swing fulcrum.
[0013] According to this configuration, in a normal case, while the door can be opened wide to facilitate getting on and off the driving part, in a special case such as attaching auxiliary wheels, etc., the door can only be opened smaller than in the normal case so that the door does not hit the auxiliary wheels, etc.
Brief Description of the Drawings
[0014]
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Embodiments for Carrying Out the Invention
[0015] Hereinafter, embodiments which are an example of the present invention will be described with reference to the drawings. In the following description, regarding the traveling body of a tractor (an example of a “work vehicle”), the direction of arrow F shown in FIGS. 1 and 2 is defined as “front of the vehicle body”, the direction of arrow B is defined as “rear of the vehicle body”, the direction of arrow U is defined as “above the vehicle body”, the direction of arrow D is defined as “below the vehicle body”, the front side of the paper surface of FIGS. 1 and 2 is defined as “left side of the vehicle body”, and the back side of the paper surface of FIGS. 1 and 2 is defined as “right side of the vehicle body”. The left-right direction of the vehicle body corresponds to the width direction of the vehicle body.
[0016] 〔Overall of the Tractor〕 As shown in FIG. 1, the tractor includes a traveling body 3 having a body frame 2 constituted by an engine 1 or the like. The traveling body 3 is provided with a pair of left and right front wheels 4 and a pair of left and right rear wheels 5. In the present embodiment, the front wheels 4 and the rear wheels 5 are tire wheels. Instead of the rear wheels 5, a mini crawler traveling device (not shown) can be provided. A power unit 6 including the engine 1 or the like is formed at the front part of the traveling body 3. A driver's cab 7 is formed at the rear part of the traveling body 3. The driver's cab 7 is provided with a driver's seat 8, a steering wheel 9 for steering the front wheels 4, and a cabin 10 covering the boarding space. A fender 11 for the rear wheels and an over fender 12 for the rear wheels are provided on the outer side of the cabin 10. The body frame 2 is constituted by the engine 1, a transmission case 13 extending rearward from the engine 1, and a front frame 14 extending forward from the lower part of the engine 1. A link mechanism 15 for connecting various working devices such as a rotary tiller (not shown) to the rear part of the transmission case 13 so as to be able to perform lifting and lowering operations, and a power take-off shaft 16 for taking out power from the engine 1 and transmitting it to the connected working device are provided.
[0017] The front wheels 4 are held in the front wheel drive case 17 so as to be steerable and drivable. The front wheel drive case 17 is held in the front frame 14. The rear wheels 5 are held in the rear part of the transmission case 13 so as to be drivable. The output of the engine 1 is input to a traveling transmission (not shown) located inside the transmission case 13 via a main clutch (not shown), and is transmitted from the traveling transmission to the front wheels 4 and the rear wheels 5.
[0018] 〔Regarding the cabin〕 As shown in FIG. 1, the cabin body 20 of the cabin 10 includes a frame body 21 which is the framework of the cabin 10. A front window transparent plate (not shown) is provided at the front part of the frame body 21, a rear window transparent plate 22 is provided at the rear part of the frame body 21, and a ceiling member 23 is provided at the upper part of the frame body 21. Entrance / exit openings 24 for enabling entry and exit to / from the passenger space are provided at the left and right side parts of the frame body 21. In the present embodiment, transparent glass plates are adopted as the front window transparent plate and the rear window transparent plate 22. As the front window transparent plate and the rear window transparent plate 22, in addition to transparent glass plates, transparent resin plates can be adopted.
[0019] More specifically, as shown in FIG. 1, the frame body 21 includes front support strut rods 25 located at the left and right side parts at the front part of the frame body 21, a front upper horizontal connecting rod (not shown) connecting the upper end parts of the left and right front support strut rods 25, rear support strut rods 26 located at the left and right side parts at the rear part of the frame body 21, upper front-rear connecting rods 27 located at the left and right side parts at the upper part of the frame body 21 and connecting the upper end part of the front support strut rod 25 and the upper end part of the rear support strut rod 26, a rear upper horizontal connecting rod 28 connecting the rear end parts of the left and right upper front-rear connecting rods 27, and lower front-rear connecting rods 29 located at the left and right side parts at the lower part of the frame body 21 and connecting the lower end part of the front support strut rod 25 and the lower end part of the rear support strut rod 26.
[0020] The front window transparent plate is attached to the left and right front support strut rods 25 and the front upper horizontal connecting rod, etc. The rear window transparent plate 22 is attached to the left and right rear support strut rods 26 and the rear upper horizontal connecting rod 28, etc. The left and right entrance / exit openings 24 are formed by the front support strut rods 25, the upper front-rear connecting rods 27, the rear support strut rods 26, and the lower front-rear connecting rods 29.
[0021] Regarding the door As shown in FIG. 1, doors 30 for opening and closing the boarding and alighting opening 24 are connected to the left and right lateral portions of the cabin body 20.
[0022] Specifically, as shown in FIG. 1, the upper and lower two positions at the rear of the door 30 are connected to the rear support rod 26 of the cabin body 20 via hinge members 31. The door 30 is swung to open and close the boarding and alighting opening 24 by using the pivot axis core P extending in the vertical direction of the aircraft provided on the hinge member 31 as a swing fulcrum. In this embodiment, the door 30 is composed of a transparent glass plate. As the door 30, in addition to the transparent glass plate, a transparent resin plate can be adopted.
[0023] As shown in FIG. 1, an external handle 32 for opening and closing the door 30 is provided on the outer surface side of the door 30. The external handle 32 is composed of a plate-shaped swing handle. An internal handle 33 for opening and closing the door 30 is provided on the inner surface side of the door 30. In this embodiment, the internal handle 33 is composed of a bar-shaped handle extending in the front-rear direction along the inner surface of the door 30. As the internal handle 33, a plate-shaped swing handle similar to the external handle 32 can be adopted.
[0024] As shown in FIGS. 1 and 3, a door damper 34 is connected to the door 30 and the cabin body 20.
[0025] As shown in FIG. 3, the connection of the door damper 34 to the door 30 is achieved by forming a door-side connection portion 35a on a contact plate member 35 applied to a portion corresponding to the hinge member 31 on the inner surface of the door 30, and connecting a connection pin 36 provided at one end of the door damper 34 to the door-side connection portion 35a. The connection pin 36 is configured to connect the door damper 34 to the door-side connection portion 35a so as to be swingable. In the present embodiment, the contact plate member 35 is utilized as a member for attaching the door-side connection portion 35a to the door 30. The door-side connection portion 35a may be provided on the door 30 by adopting a dedicated attachment member for attaching the door-side connection portion 35a to the door 30.
[0026] As shown in FIG. 3, the connection of the door damper 34 to the cabin body 20 is configured to be performed by forming cabin-side connection portions 37 at two locations, front and rear, of the lower front-rear connecting rod 29 in the cabin body 20, and connecting a connection pin 38 provided at the other end of the door damper 34 to either one of the two cabin-side connection portions 37 at the front and rear. The connection of the connection pin 38 to the cabin-side connection portion 37 is achieved by engaging a threaded shaft portion (not shown) provided on the connection pin 38 with a threaded hole (not shown) provided on the cabin-side connection portion 37. The connection pin 38 is configured to connect the door damper 34 to the cabin-side connection portion 37 so as to be swingable. In the present embodiment, the two cabin-side connection portions 37 at the front and rear protrude upward from the lower front-rear connecting rod 29, facilitating the connection of the door damper 34. As the cabin-side connection portion 37, it is possible to adopt a threaded hole opened in the lower front-rear connecting rod 29.
[0027] The door damper 34 includes a cylinder portion 34a and a rod portion 34b that is held in the cylinder portion 34a so as to be able to protrude and retract. Compressed gas is enclosed in the cylinder portion 34a. The door damper 34 is provided with a biasing force by the compressed gas in the direction in which the rod portion 34b protrudes and extends with respect to the cylinder portion 34a.
[0028] As shown in FIG. 3, as the door damper 34 swings toward the open side of the door 30, the rod portion 34b protrudes and extends with respect to the cylinder portion 34a by the biasing force, and when it reaches the extension limit, the swing limit of the door 30 toward the open side is set.
[0029] As shown in FIG. 3, of the two cabin-side connecting portions 37 at the front and rear, the front cabin-side connecting portion 37a is set to be located farther from the pivot axis center P than the rear cabin-side connecting portion 37b. Thereby, as shown by the two-dot chain line in FIG. 3, when the door damper 34 is changed and connected to the rear cabin-side connecting portion 37b at the two cabin-side connecting portions 37 at the front and rear, the swing limit of the door 30 toward the open side is set by the door damper 34 so that the door 30 can be opened from the closed position to the maximum swing angle θ1. As shown by the solid line in FIG. 3, when the door damper 34 is changed and connected to the front cabin-side connecting portion 37a at the two cabin-side connecting portions 37 at the front and rear, the swing limit of the door 30 toward the open side is set by the door damper 34 so that the door 30 can only be opened from the closed position to the maximum swing angle θ2 which is smaller than the maximum swing angle θ1.
[0030] As shown in FIG. 2, the tractor is provided with a reversible track wheel 40 that can be detached from the laterally outer side of the rear wheel 5. The reversible track wheel 40 is configured to enhance the propulsion force on wet land by the propulsion lugs 40a when attached to the rear wheel 5. The outer diameter R1 at the outer end of the wheel of the propulsion lugs 40a in the reversible track wheel 40 is set larger than the outer diameter R2 of the rear wheel 5.
[0031] As shown in FIG. 1, in the normal case where the reversible track wheel 40 is not attached, by changing and connecting the door damper 34 to the rear cabin-side connecting portion 37b of the two cabin-side connecting portions 37 at the front and rear, the door 30 can be opened to the maximum swing angle θ1, making it easier to get on and off the boarding space.
[0032] As shown in Fig. 2, in a special case where the reversing stroke wheel 40 is attached, when the door damper 34 is changed and connected to the rear cabin side connection part 37b of the two front and rear cabin side connection parts 37, the door 30 may be opened to the maximum swing angle θ1 and hit the reversing stroke wheel 40. By changing and connecting the door damper 34 to the front cabin side connection part 37a of the two front and rear cabin side connection parts 37, the swing of the door 30 is restricted by the door damper 34 so that the door 30 can only be opened to the maximum swing angle θ2 which is smaller than the maximum swing angle θ1, and the door 30 will not hit the reversing stroke wheel 40 when opened.
[0033] 〔Regarding the over fender〕 As shown in Figs. 4 and 5, the over fender 12 is provided with a strip-shaped connecting part 12a connected to the inner side part of the over fender 12, and is detachably attached to the holding part 45 of the cabin body 20 at the connecting part 12a. In this embodiment, the connecting part 12a is integrally formed with the over fender 12.
[0034] Specifically, as shown in Figs. 4 and 5, a plurality of connecting holes 46 are provided at a plurality of locations on the connecting part 12a of the over fender 12. The holding part 45 of the cabin body 20 is constituted by the inner part of the fender 11. Among the holding parts 45, fender mounting holes 47 are provided at positions corresponding to the plurality of connecting holes 46 of the over fender 12 respectively.
[0035] The blind nut 48 is fitted into the fender mounting hole 47, and the connecting bolt 49 is inserted downward into the connecting hole 46 and the blind nut 48 and engaged with the nut part 48a of the blind nut 48 and tightened, so that the connecting part 12a is detachably connected to the holding part 45.
[0036] The fender mounting hole 47 penetrates the holding part 45 in the direction along the radial direction of the rear wheel 5. Even when the over fender 12 is not attached, the fender mounting hole 47 cannot be seen from the lateral outside of the tractor.
[0037] As shown in FIGS. 4 and 5, a groove-shaped beam portion 50 is provided on the outer surface side of the holding portion 45. The beam portion 50 is attached to the holding portion 45 by adhesion. A plurality of fender attachment holes 47 in a plurality of locations when the over fender 12 is not attached, and a plurality of blind nuts 48 in a plurality of locations when the over fender 12 is attached are covered by the beam portion 50 and are not visible from the outer peripheral side of the fender 11.
[0038] 〔Alternative Embodiment〕 (1) In the above-described embodiment, the door for opening and closing the entrance / exit 24 is taken as an example. However, as the door, in addition to the door for the entrance / exit, a door for the rear window that is connected to the rear part of the cabin body 20 so as to be swingable up and down may be used.
[0039] (2) In the above-described embodiment, an example in which the change of the connection position of the door damper 34 is performed only on the cabin body 20 is shown. However, it may not be performed on the cabin body 20 but only on the door 30, or it may be possible to perform it on both the cabin body 20 and the door 30. By changing the connection position of the door damper 34 in at least one of the door 30 and the cabin body 20, the swing limit on the opening side of the door 30 can be changed and set by the door damper 34.
[0040] (3) In the above-described embodiment, an example in which two cabin-side connection portions 37 are provided is shown. However, it may be provided at three or more locations.
[0041] (4) Not limited to the above-described one provided with the cabin-side connection portion 37, a plurality of connection portions in which the connection pin of the door damper 34 is detachably locked by a locking portion, and a guide groove that communicates with the plurality of connection portions and slides the connection pin to the plurality of connection portions may be adopted.
[0042] (5) In the above-described embodiment, an example of adopting a telescopic door damper having a rod portion 34b and a cylinder portion 34a and having a biasing force toward the extending side has been shown. However, the present invention is not limited to this, and a telescopic door damper that does not have a biasing force toward the extending side, or a damper that is telescopic and has a biasing force toward the shortening side can be adopted. Further, it is possible to adopt a bending and stretching type door damper in which the arm on the door side and the arm on the cab body side are swingably connected.
[0043] (6) In the above-described embodiment, an example in which the reversing stroke wheel 40 is adopted has been shown. However, the present invention is not limited to the reversing stroke wheel 40, and various auxiliary wheels having different forms such as a basket type wheel can be adopted.
Industrial Applicability
[0044] The present invention can be applied not only to tractors but also to various work vehicles such as multi-purpose vehicles (utility vehicles) and corn harvesters.
Explanation of Signs
[0045] 3 Traveling body 7 Driving unit 10 Cab 20 Cab body 24 Entrance / exit 30 Door 34 Door damper 34a Cylinder portion 34b Rod portion 37 Cab side connecting portion (connecting portion) P Pivot axis center
Claims
1. A traveling body, An operation unit formed on the traveling body, A cabin provided in the operation unit, having a cabin main body and a door swingably connected to the cabin main body, A door damper connected to the door and the cabin main body, for setting the swing limit on the opening side of the door, is provided, A connecting portion for detachably attaching the door damper is formed at a plurality of locations on at least one of the door and the cabin main body, The door damper is a work vehicle that changes the swing limit of the door by changing and connecting the connecting portion at the plurality of connecting portions.
2. The work vehicle according to claim 1, wherein the plurality of connecting portions are formed on the cabin main body among the door and the cabin main body.
3. The work vehicle according to claim 2, wherein the door damper has a rod portion and a cylinder portion, and the rod portion has a biasing force toward the side where it protrudes and extends with respect to the cylinder portion.
4. The work vehicle according to any one of claims 1 to 3, wherein the door is a door that opens and closes an entrance of the cabin main body in a swingable state with a pivot axis extending in the vertical direction as a swing fulcrum.