JP2003092914A - Working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure of upper and lower limits of lift arms and increase the strength of a support hanging a working apparatus in the working vehicle that swings lift arms by rotating a single rotary spindle that supports a pair of the lift arms with a lift cylinder. SOLUTION: A pair of integrally rotatable positioners 47 are attached to both ends of the rotary spindle 40 supporting a pair of the left and right lift arms 20. A couple of the lifting stoppers 48 that set the upper limit of the lift arms 20 by coming into contact with the left and right positioners 47, and a pair of lowering stoppers 49 that set the lower limit of the lift arms 20 by coming into contact with the lift and right positioners 47 are installed to the machine body-reinforcing frame 31, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mounts a pair of left and right lift arms, to which a ground work device located below a vehicle body is movably connected, so as to be vertically swingable on a vehicle body by a single rotary support shaft. The present invention relates to a work vehicle including a lift cylinder that rotationally operates the rotary support shaft to swing the pair of left and right lift arms.

[0002]

2. Description of the Related Art The work vehicle constitutes a working machine used for various works, such as a lawnmower constructed by connecting a lawnmower so as to move up and down by a lift cylinder.

[0003]

In the above working machine,
For example, when the lawnmower is connected for traveling, the grounding wheel of the lawnmower may fall into a recess in the ground and the lawnmower may be suspended. Therefore, if stopper means for setting the lowering limit of the lift arm is provided and the weight of the working device is applied to the link mechanism that connects the working device so that it can be moved up and down, if the stopper means acts appropriately, It is possible to avoid a situation in which the link mechanism has a problem such as the connection posture of the link member being reversed, which makes it difficult to move the work device up and down. Further, in this type of working machine, if stopper means for setting the lifting limit of the lift arm is provided, when lifting the working device, the lifting cylinder can be advantageously operated while avoiding reaching the stroke end.

An object of the present invention is to set the lowering and ascending limits of a lift arm by stopper means having a simple structure,
Another object of the present invention is to provide a work vehicle that is supported while the member is less likely to be distorted even when the work device is in a suspended state.

[0005]

The constitution, action and effect of the invention according to claim 1 are as follows.

[Structure] A pair of left and right lift arms, to which a ground working device located below the vehicle body is movably connected, are attached to the vehicle body so as to be vertically swingable by a single rotary spindle, and the rotary spindle is also provided. In a working vehicle equipped with a lift cylinder for rotating and operating the pair of left and right lift arms, a positioning portion is rotatably provided at both ends of the rotary support shaft, and the pair of left and right positioning portions is provided. To the vehicle body, a pair of ascending stopper portions for individually abutting against each other to set the lifting limit of the lift arm, and a pair of descending stopper portions for individually abutting against the pair of left and right positioning portions to set the descending limit of the lift arm. It is prepared.

[Operation] When the lift arm is oscillated to the ascending side, the rotary support shaft rotates together with the lift arm, and its positioning portion abuts the ascending stopper portion, the lift arm reaches the ascending limit. When the lift arm is oscillated toward the lower side and the rotary support shaft rotates together with the lift arm and its positioning portion abuts on the lower stopper portion, the lower limit of the lift arm is reached. With this, when the work device is lifted, the lift arm can be lifted to prevent the lift cylinder from reaching the stroke end, and even if the work device is suspended. It is possible to suspend and support the working device while preventing the lift arm from being lowered to prevent the linking posture of the link member from being reversed. Then, both the lift stopper portion and the fall stopper portion act on the same positioning member to stop the lift arm.

In the case where the positioning portion is provided only at one place of the rotary support shaft, even if the positioning portion is provided at the central portion in the longitudinal direction of the rotary support shaft, the support by the lowering stopper portion of the rotary support shaft acts. To the both lift arms is relatively long. On the other hand, since the positioning parts are provided on both ends of the rotary support shaft, the positioning parts are positioned near the left and right lift arms, respectively, and the lowering stopper parts of the rotary support shaft support both. When the working device is in a suspended state, the span to the lift arm is shortened, and the rotation support shaft is made relatively small due to the support point by the lowering stopper and the short span to the lift arm. However, it is possible to suspend and support the working device while making it hard to generate distortion.

[Effect] Therefore, both the upper limit stop and the lower limit stop of the lift arm are hung on the rotary support shaft to prevent the lift cylinder from reaching the stroke end, and
Even when the working device is in a suspended state, the working device can be lifted and lowered while avoiding troubles such as reversal of the link connecting posture in the link mechanism.

In addition, the descending stopper portion and the ascending stopper portion act on the same positioning member to have a simple structure and can be obtained at low cost. Furthermore, even if the working device is in a suspended state, even if the rotary support shaft is relatively light and small,
It is firmly suspended and supported so that distortion does not easily occur on the rotation spindle.

The structure, operation and effect of the invention according to claim 2 are as follows.

[Structure] In the structure of the invention according to claim 1, the vehicle body is divided into a vehicle body having a transmission case connecting a clutch housing and a transmission case, and the vehicle body is divided into two lateral sides. The vehicle body reinforcing frame includes the pair of vehicle body reinforcing frames, one end side of which is connected to the clutch housing and the other end side of which is connected to the mission case, respectively, and the ascending stopper portion and the descending stopper portion are provided at the vehicle body reinforcing frame. .

[Operation] The vehicle body reinforcing frame is provided with the ascending stopper portion and the descending stopper portion, and firmly acts on the positioning member to firmly set the upper limit and the lower limit of the lift arm. It has a supporting effect on.

[Effect] Therefore, the upper limit and the lower limit of the lift arm are set, and the rotation support shaft for suspending and supporting the working device is firmly supported, and the limit setting of the lift arm and the reversal of the link connecting posture are performed. It is possible to securely and firmly prevent and suspend the working device.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 1, a prime mover having a pair of left and right front wheels 6 which can be freely driven and steered, a pair of left and right rear wheels 8 which can be freely driven, and an engine 1 located at a front end portion of a vehicle body. , A pair of left and right rear connecting a working device such as a rotary tiller to a mission case 3 forming a rear portion of a vehicle body B having a riding type operating portion having a driver's seat S located at the rear portion of the vehicle body so as to be vertically operable. Lift arm 13 and
A power work shaft 10 for transmitting the driving force from the engine 1 to the work device is provided to form a passenger work vehicle, and a lawn mowing device M is provided in a pair of left and right below the front and rear wheels of a body B of the work vehicle. A link mechanism L having lift arms 20 and 20 is connected so as to be lifted and lowered, and a driving force from the power take-out portion 11 of the mission case 3 is applied to the rotary shaft 2.
The riding lawn mower is configured by transmitting to the input section 24 located on the upper surface side of the mower deck 16 of the lawn mower M by 7 to drive the rotary blade located inside the mower deck 16.

As shown in FIGS. 1 and 2, the body B of the work vehicle comprises a body body composed of the engine 1 and the transmission case 3, and a body reinforcing frame 31 positioned on both lateral outer sides of the body body. Configured. The vehicle body includes the engine 1 and a front wheel support frame 5 whose rear end is connected to a lower portion of the engine 1 by a connecting bolt 5a.
A clutch housing 2 connected to the rear part of the engine 1, a transmission case 4 whose front end side is connected to the rear part of the clutch housing 2 by a connecting bolt 4a, and a front part to the rear end side of the transmission case 4. Are connected to each other by connecting bolts 4b, and are provided with a hydrostatic continuously variable transmission 9 for traveling which is continuously provided in the front portion, and a rear axle case 3c extending from the rear portion to both lateral outer sides. It is composed of the mission case 3.

The transmission case 4 is provided with a rotary shaft for transmitting the output of the clutch housing 2 to the continuously variable transmission 9, a rotary shaft for transmitting the front wheel output of the transmission case 9 to the front axle case 7, and the like. It is made of a bent sheet metal formed into a channel shape that opens downward.

As shown in FIGS. 2 and 6, in the left and right vehicle body reinforcing frames 31, the front end side is connected to the lateral side of the lower portion of the clutch housing 2 by a connecting bolt 33, and the rear end side is the middle of the transmission case 4. Connecting bolt 35 on the lateral outer surface side
The front frame portion 31F connected to the front frame portion 31F is connected to the rear end portion of the front frame portion 31F by the connecting bolt 32 on the front end side, and the intermediate portion is connected to the connecting portion 36 of the transmission case 4 by the connecting bolt 37. The side is constituted by a rear frame portion 31R connected to the lateral outer surface side of the mission case 3 by a connecting bolt 34.

The link mechanism L is constructed as shown in FIG. 1, FIG. 3, FIG. That is, the front end side is rotatably and detachably connected to the support portion 5b included in the front wheel support frame 5, and the rear end side is rotatably connected to the bracket 16a located at the front portion of the mower deck 16 of the lawn mower M. The front swinging link 18 and the link supporting portion 31a of the front frame portion 31F of the vehicle body reinforcing frame 31 on the left side of the vehicle body are rotatably connected at the front end side and the rear end side is located at the rear portion of the mower deck 16. Bracket 16
The rear swing link 19 rotatably connected to b, the front end side rotatably connected to the link support portion 31a provided in the front frame portion 31F of the vehicle body reinforcement frame 31 on the right side of the vehicle body, and the rear end side is A rear swing link 19, which is rotatably connected to a link bracket 16b located at the rear of the mower deck 16, is located separately on both lateral outer sides of the transmission case 4, and is supported by the transmission case 4 so as to be vertically swingable. The left and right lift arms 20, the lift link 21 connecting the rear swing link 19 on the left side of the vehicle body and the lift arm 20, the rear swing link 19 on the right side of the vehicle, and the lift arm 20. The lift link 21 and the lift cylinder C located inside the transmission case 3 are connected to each other.

As shown in FIGS. 3 and 4, the left and right lift arms 20, 20 are such that the base end side of one lift arm 20 is one end side and the base end side of the other lift arm 20 is the other end. One rotary support shaft 40, which is integrally rotatably supported on each side, is rotatably mounted over a pair of left and right support portions 41 provided on the lower portion of the transmission case 4, so that It is attached rotatably by a rotary support shaft 40 and swings up and down in conjunction with the axis of the rotary support shaft 40. As shown in FIGS. 4 and 6, the rotary support shaft 40 is detachably fitted onto the support shaft main body to which one lift arm 20 is fixed at one end and the other end side of the support shaft main body. And a cylindrical shaft portion 40a that is interlocked with the support shaft main body and has the other lift arm 20 fixed to one end thereof. The left and right supporting parts 41 are made of a metal plate bracket 41a, one end of which is fixed to the transmission case 4, and the inner surface side of the bracket 41a so as to increase the supporting area for receiving the rotation supporting shaft 40 of the supporting part 41. It is constituted by a thick plate metal 41b bolted to the.

The lift cylinder C includes the support portion 41.
The base end side of the rotation support shaft 40 is connected to the connecting pin 43 between them.
A single-acting hydraulic cylinder in which a rod is connected to an operating arm 44 for rotating the rotary support shaft 40 integrally with each other and a tube is connected to a cylinder bracket supported by the mission case 3. And the driving force by the supplied pressure oil and the lift arm 2
With the gravity of the lawnmower M applied to 0, the rotary support shaft 40 is rotated to swing the left and right lift arms 20, 20.

As shown in FIGS. 4 and 5, the rotary support shaft 4 is provided.
No. 0 supporting shaft main body and one end forming the shaft portion 40a are fixed with sheet metal members to provide positioning portions 47, and the rear frame portions of the left and right vehicle body reinforcing frames 31. A notch is provided on the upper edge side of each of 31R to provide a lift stopper portion 48 and a fall stopper portion 49.
Is provided to configure stopper means for setting the rising limit and the lowering limit of both lift arms 20, 20. That is, when the lift arm 20 swings and the rotation support shaft 40 rotates, each positioning portion 47 rotates together with the rotation support shaft 40, and the one end portion 47 a of each positioning portion 47 becomes the positioning portion 47. The abutting stopper portion 48 of the vehicle body reinforcing frame 31 contacts, or the other end portion 47b of each positioning portion 47 abuts the lowering stopper portion 49 of the vehicle body reinforcing frame 31 corresponding to the positioning portion 47. When the positioning portion 47 comes into contact with the lift stopper portion 48, the lift stopper portion 48 stops the rotation support shaft 40 so that the rotation support shaft 40 does not rotate any more.
The rocking position at that time of 0 is set as the ascent limit. When the positioning portion 47 comes into contact with the lowering stopper portion 49, the lowering stopper portion 49 stops the rotation support shaft 40 so that it does not rotate any more, so that the swing position of the lift arm 20 at that time is set as the lowering limit. Set.

That is, the link mechanism L operates the control valve of the lift cylinder C to switch the control valve of the lift cylinder C to operate the lawnmower M up and down by the driving force of the lift cylinder C and the weight of the lawnmower M. That is, when the control valve is switched to the rising side, the lift cylinder C is driven to the extension side by the pressure oil supplied, and the rotary support shaft 40 is rotated to the rising side to swing the left and right lift arms 20 to the rising side. To operate. Then, the left and right lift arms 20 are lifted by the lift link 2.
1 is pulled up and the rear swing link 19 is swung upward with respect to the vehicle body B. Then, along with this, the front swing link 18 swings upward with respect to the vehicle body B, and the lawnmower M moves up. At this time, when each positioning portion 47 of the rotary support shaft 40 of the lift arm 20 comes into contact with the lift stopper portion 48 corresponding to this positioning portion 47, each lift arm 20 reaches the lift limit, and the lawnmower M further lifts. Disappear.

When the control valve is switched to the descending side, the lift cylinder C becomes oil-drainable and the weight of the lawnmower M rotates the rotary support shaft 40 to the descending and ascending side to move the left and right lift arms 20. Swing down. Then, the left and right lift arms 20 lower the lift link 21 and swing the rear swing link 19 downward with respect to the vehicle body B. Then, along with this, the front swing link 18 swings downward with respect to the vehicle body B, and the lawnmower M descends. At this time, when each positioning portion 47 of the rotary support shaft 40 of the lift arm 20 comes into contact with the lowering stopper portion 49 corresponding to the positioning portion 47, each lift arm 20 reaches the lower limit and the lawnmower M further descends. Disappear. In this state, the lawn mower M as shown in FIG.
When the lawn mowing device M is in a suspended state due to the entering into the concave portion of the ground, the left and right lift arms 20 and 20 are brought into contact with the lowering stopper portion 49 of each positioning portion 47 of the rotary support shaft 40, so that the left and right lift arms 20 and 20 are reinforced. The lawn mowing device M is suspended and supported while being supported so as not to further descend.

The hydraulic pipe 51 connecting the control valve of the lift cylinder C to the hydraulic pump, and the rear lift arm 1
The hydraulic pipe 52 connecting the control valve of the lift cylinder that swings 3 to the hydraulic pump is fixed to the vehicle body B by the fixing structure shown in FIGS. That is, the band hole 5 of the stay 53 fixed to the outer surface side of the transmission case 4
Pipe band 5 which is locked to the stay 53 through 3a
4, the hydraulic pipes 51 and 52 are fixed to the stay 53. The slanted portion 53 that is in the forward rising state on the front end side of the stay 53
While the b is provided, the inclined portion 53b prevents the hydraulic pipes 51 and 52 from coming off the stay 53 by suppressing the displacement movement of the hydraulic pipes 51 and 52.

As shown in FIG. 9, a plurality of square pipe members along the front and rear and up and down directions of the vehicle body are combined to form a packaging case 60 for accommodating the work vehicle during transportation.
As shown in FIG. 10, a guide body 65 made of an angle member
And a mounting rod 66 extending from the back of the guide main body 65 constitute a take-out guide. This take-out guide is used when taking out the packing case 60 loaded in the container 68, and is constructed as follows in detail.

That is, the packing case 60 is replaced with the container 68.
When taking out from the container 68, the fork claws of the carry-out vehicle are inserted into the claw mounting holes 61 provided on both sides of the lower part of the packaging case 60 as shown in FIG. 10 and pulled out from the inside of the container 68 toward the take-out port. At this time, by inserting the take-out guide mounting rods 66 into the guide mounting holes 62 as shown in FIG. 10 formed by the holes of the square pipe material existing on both sides of the lower portion of the packing case 60, Attach the ejection guide on the side. Then, on the side wall surface of the container 68, the ridges 69 extending in the vertical direction of the container 68 are provided.
When the packing case 60 is not equipped with a pick-up guide, the corners of the packing case 60 enter the spaces between the ridges on the side wall and are caught by the ridges 69. However, when the take-out guide is attached, the take-out guide causes the slanted guide surface 65a of the guide body 65 to project the corners of the packing case 60 into the ridges 6.
It is hard to get caught in 9. With this, the packing case 60
The work vehicle stored in can be smoothly and efficiently taken out of the container 68.

[Other Embodiments] In addition to the lawnmower M, the present invention can be applied to a work vehicle that connects various work devices such as a cleaning device for sucking dust. Therefore, the lawnmower M and the cleaning device are collectively referred to as a ground work device M.

[Brief description of drawings]

1] Side view of the entire riding lawn mower

[Fig. 2] Side view of the vehicle body

FIG. 3 is a cross-sectional view showing a link mechanism mounting structure of a vehicle body.

FIG. 4 is a sectional view of a lift arm mounting portion of a vehicle body.

FIG. 5 is a side view of stopper means.

FIG. 6 is an exploded perspective view of a vehicle body and a lift arm spindle.

FIG. 7 is a sectional view of a hydraulic hose support structure.

FIG. 8 is a plan view of a hydraulic hose support structure.

FIG. 9 is a side view showing a packed state of the work vehicle.

FIG. 10 is a perspective view of an ejection guide.

FIG. 11 is an explanatory diagram showing the usage procedure of the take-out guide.

[Explanation of symbols]

2 clutch housing 3 mission case 4 transmission cases 20 lift arm 40 rotation spindle 47 Positioning unit 48 Lift stopper 49 Lowering stopper M Ground work device C lift cylinder B body

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Seiichi Nakanishi             64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubo Co., Ltd.             Ta Sakai Factory (72) Inventor Shunzo Yamada             64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubo Co., Ltd.             Ta Sakai Factory (72) Inventor Takeo Komine             64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubo Co., Ltd.             Ta Sakai Factory (72) Inventor Masaya Washizuka             64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubo Co., Ltd.             Ta Sakai Factory F term (reference) 2B083 AA02 BA12 BA18 HA06

Claims (2)

[Claims] 1. A pair of left and right lift arms, to which a ground working device located below the vehicle body is movably connected, are attached to a vehicle body so as to be vertically swingable by a single rotary spindle, and the rotary spindle is A working vehicle including a lift cylinder that rotates to swing and operate the pair of left and right lift arms, wherein positioning portions are integrally rotatably provided on both end sides of the rotation support shaft, and the pair of left and right positioning portions are positioned. A pair of lift stoppers that individually abut on the parts to set the lift limit of the lift arm, and a pair of descending stoppers that individually contact the pair of left and right positioning parts to set the lower limit of the lift arm. Work vehicle prepared for. 2. A vehicle body having a transmission case connecting a clutch housing and a transmission case, the vehicle body, the vehicle body separately located on both lateral sides of the vehicle body, and one end side of which is the clutch housing, and the other. 2. The work vehicle according to claim 1, further comprising a pair of vehicle body reinforcing frames each having an end side connected to the mission case, the vehicle body reinforcing frame including the ascending stopper portion and the descending stopper portion.