JP2019059372A - Work vehicle - Google Patents

Abstract

An object of the present invention is to reduce the risk of damage to a gas spring that applies an assisting force when changing the attitude of a loading platform. SOLUTION: A loading platform 4 supported by a vehicle body side fixed portion 20 so as to be swingable in a horizontal attitude for loading luggage and an inclined attitude capable of discharging a load outward; A gas spring 55 is provided over the portion and the support portion 59 of the vehicle body side fixed portion 20 and provides an assisting force at the time of the posture switching of the loading platform 4, and the connection portion between the gas spring 55 and the support portion 59 While it is possible to apply an assisting force by the extension operation, and when the gas spring 55 is at or near the maximum extension state, the relative position of the gas spring 55 and the support portion 59 in the set range along the extension direction A flexible section YD is provided to allow movement. [Selected figure] Figure 9

Description

  The present invention relates to a working vehicle provided with a gas spring that applies an assisting force when manually swinging a swingably supported platform.

  In the working vehicle of the above configuration, conventionally, the gas spring is provided over the swing action location and the vehicle body side fixing part along with the posture change of the loading platform, the connection location between the gas spring and the loading platform, and the gas spring and the vehicle location fixing In each of the connection points with the parts, it is configured to be pivotally connected pivotably around one axis (see, for example, Patent Document 1).

JP, 2017-63675, A

  According to the above-described conventional configuration, the posture change of the loading platform is permitted by pivotally connecting each other between the gas spring and the loading platform and between the gas spring and the vehicle body side fixing portion so as to be swingable relative to each other. The expansion and contraction operation of the gas spring can be performed in a state in which the auxiliary force can be applied.

  It is a normal posture switching operation that the posture change operation is finished when the posture of the loading platform is manually changed with the application of the assisting force of the gas spring and the gas spring is in the most extended state. However, even though the gas spring is in the most extended state as described above, a tensile force may act in the direction to further extend the gas spring in the extended position. For example, when the operator erroneously determines that the change of the posture of the carrier has not been completed, the carrier swings in the direction to further extend the gas spring, or when the carrier is in the inclined posture, An object may come in contact and an excessive force may be applied in the direction to further extend the gas spring. If such an excessive force is applied repeatedly, the gas spring may be damaged.

  Therefore, it has been desired to reduce the possibility of damage to the gas spring that applies an assisting force when the attitude of the loading platform is changed.

The characteristic configuration of the work vehicle according to the present invention is
A loading platform supported by a vehicle-body-side fixed portion so as to swing freely between a horizontal position for loading luggage and an inclined posture capable of discharging the load outward, a swing action location according to the attitude change of the loading platform and the vehicle-side fixing A gas spring which is provided across the unit and provides an assisting force at the time of the posture switching from the horizontal posture to the inclined posture of the loading platform;
The auxiliary force can be applied by the extending operation of the gas spring to at least one of the connection point between the gas spring and the loading platform and the connection point between the gas spring and the vehicle body side fixing portion In the setting range along the extension direction between the gas spring and the vehicle body side fixed part or between the gas spring and the loading platform when the gas spring is at or near the maximum extension state. The flexible part which allows relative movement at the point is provided.

  According to the present invention, when the posture of the loading platform is manually changed with the application of the auxiliary force of the gas spring, the application of the auxiliary force is ended when the gas spring is most extended or almost extended. . After that, when an external force acts on the loading platform in a direction to further extend the gas spring in the extended posture for some reason, in the flexible portion, between the gas spring and the vehicle body side fixed portion or the gas spring Relative movement within the set range along the extension direction is permitted between the and the platform. As a result, it is easy to avoid applying an unreasonable force in the direction in which the gas spring is extended due to the above-mentioned external force.

  Therefore, in the attitude change operation of the loading platform, it is avoided that an excessive force is applied to the gas spring in the direction of extension, and the risk of damage to the gas spring that gives an assisting force when changing the attitude of the loading platform is reduced. It became possible.

In the present invention,
The flexible section
A locking pin provided on any one of the gas spring and the counterpart member so as to extend along a direction intersecting the extending direction;
The other of the gas spring and the other member is provided with an elongated hole formed along the extending direction in a state in which the locking pin is engaged with each other, and
In the state where the locking pin is received at one end of the long hole, the auxiliary force can be applied by the extending operation of the gas spring, and the locking pin is within the range of the long hole. It is preferable to be configured to allow movement along the extension direction.

  According to this configuration, the assisting force can be applied by the gas spring extending in a state in which the locking pin is received at one end of the elongated hole. Then, after the gas spring reaches the maximum extension state or a state near it, even if an external force acts on the loading platform in a direction to further extend the gas spring in the extension posture, the locking pin is in the long hole It can move freely within the range, and it is possible to avoid applying an excessive force to the gas spring.

  In this manner, the flexible structure of the lock pin and the long hole makes it possible to prevent the gas spring from being subjected to an excessive force.

  In the present invention, the locking pin is moved from one end of the elongated hole along the extending direction to an intermediate position from the one end of the elongated hole to the other end of the elongated hole in accordance with the swing of the loading platform. It is preferable that the cargo support be provided with a contact control unit that contacts the receiving portion of the vehicle body side fixing unit to restrict further swinging.

  According to this configuration, as described above, when an external force acts on the loading platform in the direction to further extend the gas spring in the extension posture, the locking pin starts to move along the extension direction from one end of the long hole However, on the way until the locking pin reaches the other end of the long hole, the contact control portion provided on the bed touches the receiving portion of the vehicle-side fixing portion to restrict further swinging. Ru.

  When the locking pin is in the middle position of the long hole, the bed is restricted from swinging further, so that it is possible to reliably prevent the tensile force from acting in the direction to further extend the gas spring in the extended position. It is possible to prevent the gas spring from being damaged due to the external force acting in the extending direction.

It is a whole side view of a multipurpose work car. It is a whole top view of a multipurpose work vehicle. It is a rear view of a multipurpose work vehicle. It is a side view of the vehicle body rear of a multipurpose work vehicle. It is a perspective view showing the circumference of an engine. It is a notch side view which shows the attachment state of a 1st heat shielding member. It is an exploded perspective view of a gas spring arrangement part. It is a perspective view showing a gas spring arrangement part. It is a side view of the gas spring arrangement part in a state of degeneracy. It is a side view of the gas spring arrangement part in an extended state.

Hereinafter, the case where an embodiment of the present invention is applied to a multipurpose work vehicle which is an example of a work vehicle will be described based on the drawings.
In the description of the present embodiment, the front-rear direction and the left-right direction are described as follows, unless otherwise specified. That is, the direction shown by arrow F in FIGS. 1 and 2 is “front side”, the direction shown by arrow B in FIGS. 1 and 2 is “back side”, the direction shown by arrow R in FIG. The direction indicated by L is "left side".

〔overall structure〕
The multipurpose work vehicle which is an example of the work vehicle shown in FIGS. 1 and 2 is a work vehicle used for multipurpose applications such as luggage transportation and recreation. A multipurpose work vehicle includes a steerable and drivable pair of left and right front wheels 1, a pair of drivable left and right rear wheels 2, an operation unit 3 on which an operator or the like can ride, and a loading platform capable of loading luggage 4 and a driving unit 5 and the like located below the loading platform 4 are provided.

  The driver's seat 6 on which the operator is seated and the auxiliary seat 7 disposed adjacent to the driver's seat 6 on the driver's seat 3 and on which the rider can sit, the steering wheel 8 for steering operation, and the gear change operation The shift lever 9 etc. is provided. The steering wheel 8 and the shift lever 9 are disposed on a driving panel 10 located in front of the driver's seat 6.

  As shown in FIGS. 1 and 2, the driving unit 5 includes a gasoline engine (hereinafter referred to as an engine) 11, a transmission case 12 located behind the engine 11, a left side of the engine 11 and the transmission case 12 A continuously variable transmission 13 that transmits power from the engine 11 to the transmission case 12, a gas supply device 14 that supplies combustion air to the engine 11, an exhaust device 15 that processes exhaust gas from the engine 11, and the like are provided.

  The periphery of the continuously variable transmission 13 is covered by a case, and a belt type continuously variable transmission mechanism (not shown) is internally provided inside the case. The continuously variable transmission 13 is connected to and supported by the engine 11 and the lateral side of the transmission case 12. The transmission case 12 is connected and supported on the rear side of the engine 11. An openable / closable bonnet 16 is provided at the front of the traveling vehicle body, and in a space formed in the bonnet 16, a radiator 17 or the like for cooling the engine 11 is disposed.

  The engine 11 is disposed in a horizontal orientation such that the crankshaft extends in the left-right direction of the vehicle body and the cylinder head 18 is inclined obliquely upward. That is, as shown in FIGS. 5 and 6, the upper surface portion 18A of the cylinder head 18 of the engine 11 is inclined rearward and downward so as to be positioned downward as it goes rearward.

  As shown in FIG. 1, the traveling vehicle body is provided with a main frame 19 that supports the front and middle portions of the vehicle body, and a rear frame 20 that supports the motive power unit 5. As shown in FIG. 3, the rear frame 20 supports the left and right rear wheels 2 via the double wishbone type left and right rear suspensions 21. The main frame 19 supports the left and right front wheels 1 via a front suspension (not shown).

  As shown in FIGS. 4 and 5, the rear frame 20 is provided to surround the engine 11. As shown in FIG. 7, the rear frame 20 includes left and right support frames 22 extending in the front-rear direction, and a horizontally extending lower transverse frame 23 connecting rear end portions of the left and right support frames 22. Horizontally connects the upper and lower intermediate positions of the rear vertical frame 24 extending in the vertical direction, which is provided upright from the rear end of the left and right support frames 22, and the rear vertical frame 24 on the left and right via the first bracket 25 An intermediate lateral frame 26 extending in a direction is provided. Furthermore, in the rear frame 20, an upper front-rear direction frame 28 connected to the upper end portion of each rear vertical-direction frame 24 via a second bracket 27, and an upper portion connecting front and rear middle portions of the left and right upper front-rear direction frames 28 A sideways frame 29 or the like is provided.

  The left and right support frames 22 are each formed by a square pipe. The left and right support frames 22 are bent so that the rear side extends in the front-rear direction, the front and rear mid-sections are located on the outer side as they go from the rear to the front, and the front side extends in the front-rear direction It has a shape.

  The power of the engine 11 is transmitted to the transmission case 12 after being continuously shifted by the continuously variable transmission 13. By means of a gear type transmission mechanism (not shown) provided in the transmission case 12, a forward state (first forward and second forward), a reverse state, and a neutral state can be realized. As shown in FIG. 2, the power of the transmission case 12 is transmitted to the rear axle 31 and transmitted from the rear axle 31 to the left and right rear wheels 2. The power of the transmission case 12 is transmitted to the front axle 34 via the power takeoff shaft 32, the propulsion shaft 33, etc., and can be transmitted from the front axle 34 to the left and right front wheels 1. The power takeoff shaft 32 is located below the engine 11.

  As shown in FIG. 2, the air supply device 14 and the exhaust device 15 are distributed and disposed on both left and right sides. The exhaust system 15 is provided with an exhaust pipe 35 through which exhaust gas discharged from the engine 11 flows, and a muffler 36 capable of reducing exhaust noise. The exhaust pipe 35 is extended from the engine 11 toward the front of the airframe and then bent, bypassing the side of the engine 11 and extended toward the rear of the airframe. The exhaust pipe 35 is disposed to pass above the continuously variable transmission 13. Two exhaust pipes 35 are extended from the rear end of the engine 11 and joined at the front end of the muffler 36 and then connected to the muffler 36. Exhaust gas whose exhaust noise has been reduced by the muffler 36 is discharged outward from the exhaust port 37 at the rear of the vehicle body.

  As shown in FIG. 2, the air supply device 14 includes an air supply pipe 38 through which combustion air introduced into the engine 11 flows, an air cleaner 39 for removing dust from the air, a resonator 40 for silencing intake noise, and an engine A throttle valve 41 for changing and adjusting the amount of combustion air supplied to 11 and a branch portion 42 for branching an air supply path to each cylinder of the engine 11 are provided.

  As shown in FIG. 3, the resonator 40 and the muffler 36 are located in a space surrounded by the upper horizontal frame 29, the middle horizontal frame 26, the left and right rear vertical frames 24, and the upper front and rear frames 28.

[Heat shield member]
As shown in FIGS. 1 and 2, the driver's seat 6 and the auxiliary seat 7 are disposed obliquely above the front of the exhaust pipe 35. Therefore, as shown in FIGS. 5 and 6, a first heat shield member 43 is provided which partitions the space between the operation unit 3 and the exhaust pipe 35 of the exhaust device 15. The first heat shield member 43 covers the front of the exhaust pipe 35. As shown in FIG. 5, the first heat shield member 43 is wider than the exhaust pipe 35 in the left-right direction, and is formed to have a left-right width covering the entire left-right width of the exhaust pipe 35.

  As shown in FIG. 6, the first heat shield member 43 is extended rearward from the upper end of the front side 43 a and the front side 43 a covering the front side of the front of the exhaust pipe 35. An upper portion 43b covers the upper side of the upper portion, and an extending portion 43c extends rearward from the rear end of the upper portion 43b and covers the upper portion of the front of the cylinder head 18 of the engine 11. The first heat shield member 43 is integrally formed by bending a sheet metal. The rear end portion of the first heat shield member 43 extends to the vicinity of the center front and rear of the cylinder head 18 and is inclined rearward and downward so as to be positioned downward as it goes rearward. The upper portion 43 b extends to a position directly below the front end of the loading platform 4, and the first heat shield member 43 divides the space between the exhaust pipe 35 and the operation unit 3, and the loading platform 4 and the exhaust It separates from the pipe 35.

  As shown in FIG. 6, the first heat shield member 43 is fixed to the rear frame 20. The two left and right end portions of the front side portion 43a of the first heat shield member 43 are bolted to the first stay 44 having an L-shaped cross section extending laterally inward from the upper front and rear facing frame 28, respectively. It is supported by the orientation frame 28. In addition, two places on the upper side 43b of the first heat shield member 43 laterally inward of the first stay 44 are bolted to and supported by a second stay 45 having an L-shaped cross section extending inwardly in the lateral direction. ing. The second stay 45 is supported by a connecting member 47 that connects the upper front-rear direction frame 28 and the laterally extending round pipe-like horizontal frame body 46.

  As shown in FIG. 6, a clearance C is provided between the rear end portion of the first heat shield member 43 and the top surface portion 18 </ b> A of the front portion of the cylinder head 18. The first heat shield member 43 is provided with a shield portion 48 having heat resistance and elasticity that fills the clearance C. The shielding portion 48 has a horizontally long shape so as to cover substantially the entire upper surface portion 18A of the cylinder head 18 of the engine 11.

  As shown in FIG. 6, the shielding portion 48 is provided so as to cover the periphery of the heat insulating material 49 (glass wool) provided in a strip shape from both upper and lower sides by the aluminum foil 50, and the heat insulating material 49 is folded in two. It is provided in a state in which the rear end portion of the first heat shield member 43 is sandwiched. The shielding portion 48 is affixed and fixed to the rear end portion of the first heat shield member 43 by a double-sided adhesive tape 51 having adhesive surfaces on both front and back sides. The aluminum foil 50 is not provided inside the bent portion so that the bending can be smoothly performed.

  By covering with the aluminum foil 50 so that the heat insulating material 49 (glass wool) is not exposed outward as described above, the durability can be improved while maintaining the heat insulating property. As shown in FIG. 5, a second heat shielding member 52 is provided between the loading platform 4 and the exhaust pipe 35.

[Support structure of loading platform]
The loading platform 4 is supported by a rear frame 20 as a vehicle body side fixing portion so as to freely swing between a horizontal position for loading a load and an inclined position capable of discharging the load outward. The loading platform 4 is supported by the rear frame 20 so as to be pivotable about a horizontal axis X located at the rear side of the vehicle body and lifts the front end from a horizontal posture for loading luggage and discharges the load from the rear end side The attitude can be changed to a possible inclined attitude (dumping state). Although the posture change of the loading platform 4 is performed manually, the gas spring 55 is configured to provide an operation assisting force in the manual operation.

  As shown in FIG. 9, left and right bosses 56 are provided at the rear ends of the left and right upper front-to-back frames 28 of the rear frame 20 to support the load carrier 4 so as to be able to move up and down. Left and right fulcrum members 57 are provided at positions corresponding to the left and right bosses 56 on the lower surface on the rear side of the loading platform 4. The left and right bolts 58 are provided in a state of being inserted through the left and right bosses 56 and the left and right fulcrum members 57 respectively. The bolt 58 functions as a left and right support shaft, and the loading platform 4 is supported by the rear frame 20 so as to be pivotable about the horizontal axis X by the bolt 58.

  As shown in FIG. 3, the gas spring 55 is disposed between the resonator 40 and the right rear vertical frame 24. That is, as shown in FIGS. 7, 8 and 9, the lower portion of the gas spring 55 is supported by the right rear vertical frame 24 adjacent to the resonator 40 of the left rear vertical frame 24 via the bracket 59. There is. The bracket 59 functions as a support portion of the vehicle-body-side fixing portion, and is bolted to the rear vertical frame 24 on the right side. As shown in FIGS. 7 and 8, the bracket 59 is fixed to the front and left side of the rear vertical frame 24 on the right side by bolt connection.

  As shown in FIGS. 7, 8 and 9, the gas spring 55 is provided with the cylinder tube 55A at the upper side and the piston rod 55B at the lower side, and is engaged with the lower end of the piston rod 55B in the left-right direction. A locking pin 60 is provided, and the locking pin 60 is linked and supported in a state of inserting the insertion hole 61 formed in the bracket 59. The location where the locking pin 60 of the bracket 59 is inserted is formed by a double-supported support structure that supports the pivotal connection portion 55C provided on the gas spring 55 side so as to sandwich it from both left and right sides.

  As shown in FIG. 8, the connection bracket 62 is attached to the bottom of the loading platform 4 by bolt connection, and the connection bracket 62 and the upper end of the cylinder tube 55A of the gas spring 55 are rotated relative to each other by the connection pin 63 facing horizontally. It is freely pivotally connected. A rectangular tubular reinforcing member 4B is provided on the bottom surface 4A of the loading platform 4 so as to extend in the lateral direction. The connection bracket 62 is bolted in a state of being in contact with the reinforcing member 4B. Further, the location where the connection pin 63 of the connection bracket 62 is inserted is formed by a double-supported support structure that supports the pivot connection portion 55D provided on the gas spring 55 side so as to sandwich it from both left and right sides.

  While it is possible to apply an auxiliary force by the extending operation of the gas spring 55 to the connection point between the gas spring 55 and the bracket 59, and when the gas spring 55 is at or near its maximum extension state, the gas spring 55 and the bracket A flexible portion YD is provided to allow relative movement within a set range along the extension direction between 59 and 59.

  That is, as shown in FIGS. 7 and 8, the insertion hole 61 formed in the bracket 59 is formed in a long hole formed long along the extension direction of the gas spring 55, ie, the vertical direction. The locking pin 60 is inserted through the elongated insertion hole 61 in a state where the detachment is prevented. The locking pin 60 is provided so as to be movable in the range of the elongated hole along the longitudinal direction of the insertion hole 61.

  In this configuration, in the state where the locking pin 60 is received at the lower end edge of the insertion hole 61 as one end portion of the long hole, it is possible to apply an assisting force to the loading platform 4 by the extending operation of the gas spring 55. When an external force is applied to the loading platform 4 in the direction of extension when the gas spring 55 is at or near the maximum extension state, the locking pin 60 extends in the range of the elongated hole of the insertion hole 61 It is possible to move relative to

  Therefore, the flexible portion YD is formed by the locking pin 60 provided on the gas spring 55 in a state extending along the direction crossing the extension direction and the insertion hole 61 as a long hole formed on the bracket 59 of the gas spring 55. Is configured. Therefore, the bracket 59 functions as a support for the vehicle-body-side fixed portion and also functions as a mating member.

  The locking pin 60 moves along the extending direction from the lower end edge of the insertion hole 61 as one end of the long hole along with the swinging of the loading platform 4 and the insertion hole 61 as the other end of the long hole. A contact control portion 65 is provided on the loading platform 4 for contacting the receiving portion 64 of the vehicle body frame S to restrict further swinging when in the middle position up to the upper end edge.

  That is, as shown in FIG. 9, the receiving portion 64 is extended in a state of extending rearward and downward from the rear end portion of the upper front-rear direction frame 28 on the right side. Even when the loading platform 4 is switched to the inclined position and the gas spring 55 reaches the maximum extension state, an external force is applied to the loading platform 4 in the extending direction and the locking pin 60 reaches the middle position of the insertion hole 61, As shown in FIG. 10, the contact regulation portion 65 on the side of the cargo bed 4 abuts on the receiving portion 64, and further swinging is regulated. By thus restricting the swinging movement of the loading space 4, an excessive force is not applied to the gas spring 55 in the extending direction, and the risk of damage to the gas spring 55 is reduced.

[Another embodiment]
(1) In the above embodiment, the flexible portion YD is provided at the connection point between the gas spring 55 and the bracket 59 (the support portion of the vehicle body side fixing portion), but instead of this configuration, the gas spring 55 and the loading platform Alternatively, the flexible portion YD may be provided at the connection portion with 4, and the flexible portion YD may be provided at each of the connection portion between the gas spring 55 and the bracket 59 and the connection portion between the gas spring 55 and the bed 4 It is also good.

(2) In the above embodiment, the lock pin 60 is provided on the gas spring 55 as the flexible portion YD, and the long hole (insertion hole) 61 is formed in the mating member (bracket 59). Instead of the configuration, the gas spring 55 may be provided with an elongated hole (insertion hole) and the mating member (bracket 59) may be provided with the locking pin 60. Also, instead of the flexible portion YD being configured by the locking pin and the long hole, another type of flexible structure, for example, one configured by interposing a flexible coil spring may be used.

(3) In the above-described embodiment, the contact restriction portion 65 for restricting the swing by coming into contact with the reception portion 64 of the rear frame 20 (vehicle side fixed portion) is provided on the loading platform 4. Such a receiving portion 64 and the contact control portion 65 may not be provided.

(4) In the above embodiment, a multipurpose work vehicle is described as an example of a work vehicle, but the invention is not limited to the multipurpose work vehicle, and the present invention can be applied to various types of work vehicles equipped with a loading platform.

  The present invention can be applied to a working vehicle provided with a gas spring that applies an assisting force when manually swinging a swingably supported platform.

4 Loading platform 20 Vehicle side fixing portion 55 Gas spring 59 Support portion (parting member)
60 Locking pin 61 Long hole 64 Receiving part 65 Contact control part YD flexible part

Claims (3)

A loading platform supported on the vehicle-side fixed portion so as to freely swing between a horizontal position for loading a load and an inclined position capable of discharging the load outward;
A gas spring which is provided across the swing action portion accompanying the posture change of the loading platform and the support portion of the vehicle-body-side fixing unit, and applies an assisting force at the time of the posture switching from the horizontal orientation of the loading platform to the inclined orientation; Is equipped with
The auxiliary force can be applied by the extending operation of the gas spring to at least one of the connection point between the gas spring and the loading platform and the connection point between the gas spring and the support portion. When the gas spring is at or near the maximum extension state, relative movement within a set range along the extension direction between the gas spring and the bed or between the gas spring and the support portion A working vehicle provided with an acceptable interchange. The flexible section
A locking pin provided on any one of the gas spring and the counterpart member so as to extend along a direction intersecting the extending direction;
The other of the gas spring and the other member is provided with an elongated hole formed along the extending direction in a state in which the locking pin is engaged with each other, and
In the state where the locking pin is received at one end of the long hole, the auxiliary force can be applied by the extending operation of the gas spring, and the locking pin is within the range of the long hole. The work vehicle according to claim 1, wherein movement along the extension direction is allowed.   When the locking pin is moved from one end of the elongated hole along the extending direction to the other end of the elongated hole along with the swinging of the loading platform, the vehicle body The work vehicle according to claim 2, wherein a contact control unit that contacts the receiving portion of the side fixed portion and controls further swinging is provided on the loading platform.

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