JP2008201290A - Riding type working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a riding type working vehicle capable of increasing the ground clearance in the vicinity of right and left connecting rods when connecting the right and left connecting rods over right and left parts of a steering member and right and left knuckle arms (front wheel). <P>SOLUTION: Right and left front wheels 1 are steerably provided on right and left outer sides of a machine body frame 3, and knuckle arms 11b of the right and left front wheels 1 extends toward the machine body frame 3. Steering members 14, 15 to be rocked around the longitudinal axis P2 interlockingly with the operation of a steering wheel 17 are provided on the machine body frame 3 backward of the right and left front wheels 1. Right and left connecting rods 18 are connected to right and left parts of the steering members 14, 15 and the right and left knuckle arms 11b. Connection points of the right and left parts of the steering members 14, 15 to the right and left connecting rods 18, and connection points of the right and left knuckle arms 11b to the right and left connecting rods 18 are located on the right and left outer sides of the machine body frame 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a riding type work vehicle provided with steerable right and left front wheels.

  In a passenger work vehicle, for example, as disclosed in Patent Literature 1, an aircraft frame (FIGS. 3 and 4 11a in Patent Literature 1) arranged in the longitudinal direction of the aircraft, steerable right and left front wheels ( Fig. 3 WF of Patent Literature 1), right and left knuckle arms (46 of Fig. 3 of Patent Literature 1) provided on the right and left front wheels, steering members (FIG. 3 and 4 of Patent Literature 1). 48) and connecting the right and left connecting rods (FIGS. 3 and 47 in FIG. 4 of Patent Document 1) across the right and left side portions of the steering member and the right and left knuckle arms. There is.

  Accordingly, when the steering member is driven to swing around the longitudinal axis in conjunction with the operation of the steering handle (FIG. 1 of Patent Document 1), the right and left linkage rods are pushed and pulled, and the right And the right and left front wheels are steered through the left knuckle arm.

USP5788276

In Patent Document 1, the lower side of the body frame (FIGS. 3 and 4 11a in Patent Document 1) arranged in the longitudinal direction of the body is connected to the right and left linkage rods (47 in FIGS. 3 and 4 in Patent Document 1). ) Are crossed diagonally.
In Patent Document 1, a connection point between the right side rod of the steering member and the right linkage rod, a connection point between the right knuckle arm and the right linkage rod, a connection point between the left side portion of the steering member and the left linkage rod, Generally, a ball-type joint or the like is used at the connection point between the knuckle arm and the left linkage rod, and this joint is relatively large.

  Accordingly, in Patent Document 1, since the connection points (joints) between the right and left side portions of the steering member and the right and left connecting rods are located below the body frame, interference with the body frame is prevented. In order to avoid this, it is necessary to lower the position of the connection point (joint) between the right and left side portions of the steering member and the right and left linking rods, and to ensure the minimum ground clearance near the right and left linking rods. There is room for improvement.

  The present invention, in a passenger work vehicle, over the right and left side of the steering member that is driven to swing around the vertical axis in conjunction with the operation of the steering handle, and the right and left knuckle arms (front wheels), When the right and left linking rods are connected, the object is to make it possible to increase the minimum ground clearance near the right and left linking rods.

[I]
(Constitution)
The first feature of the present invention resides in the following configuration in a passenger work vehicle.
The right and left front wheels are steerable on the right and left lateral outer sides of the aircraft frame arranged in the longitudinal direction of the aircraft, and the right and left knuckle arms provided on the right and left front wheels are used as the aircraft frame. Extend towards. A steering member that is driven to swing around the longitudinal axis in conjunction with the operation of the steering handle is provided in the body frame on the rear side of the right and left front wheels. The right linkage rod is connected across the right side of the steering member and the right knuckle arm, and the left linkage rod is connected across the left side of the steering member and the left knuckle arm. A connection point between the right side portion of the steering member and the right linkage rod and a connection point between the right knuckle arm and the right linkage rod are located on the right lateral outer side of the body frame. A connection point between the left side portion of the steering member and the left linkage rod, and a connection point between the left knuckle arm and the left linkage rod are located on the left lateral outer side of the body frame.

(Function)
According to the first aspect of the present invention, the connection point between the right side of the steering member and the right linkage rod, and the connection point between the right knuckle arm and the right linkage rod are located on the right lateral outside of the fuselage frame. ing. A connection point between the left side portion of the steering member and the left linking rod, and a connection point between the left knuckle arm and the left linking rod are located on the left lateral outer side of the body frame.
Thus, the connection point between the right side of the steering member and the right linkage rod, the connection point between the right knuckle arm and the right linkage rod, the connection point between the left side of the steering member and the left linkage rod, and the left knuckle Even if a ball-type joint is used as the connection point between the arm and the left linkage rod, these connection points (joints) are not located below the fuselage frame (the right and left sides of the steering member and the right And the connection point (joint) with the left linkage rod is not located on the lower side of the fuselage frame), avoiding interference with the fuselage frame, and avoiding interference with the right and left linkage rods of the steering member. It becomes possible to set the position of the connection point (joint) to a high position.

In Patent Document 1, the steering member side portions of the right and left linkage rods are obliquely inserted into the lower side of the body frame. As a result, the space below the fuselage frame is narrowed by the portion of the right and left linkage rods on the steering member side.
According to the first aspect of the present invention, the connection point between the right side portion of the steering member and the right linkage rod is located on the right lateral outer side of the fuselage frame, and the connection point between the left side portion of the steering member and the left linkage rod is Since it is located on the left lateral outer side of the fuselage frame, the steering member side portions of the right and left linkage rods are not obliquely inserted under the fuselage frame (right and left of the fuselage frame Located on the outside of Thereby, the space below the fuselage frame is wider than that of Patent Document 1.

(The invention's effect)
According to the first aspect of the present invention, in a passenger work vehicle, the right and left side portions of the steering member that are driven to swing around the vertical axis in conjunction with the operation of the steering handle, and the right and left knuckle arms (front wheels) ), The connecting point (joint) between the right and left linking rods of the steering member and the right and left linking rods can be set to a high position. As a result (the minimum ground clearance near the right and left connecting rods can be increased), the traveling performance of the passenger work vehicle can be improved.

  According to the first aspect of the present invention, the connection point between the right side portion of the steering member and the right linkage rod is located on the right lateral outer side of the fuselage frame, and the connection point between the left side portion of the steering member and the left linkage rod is By being located on the left lateral outer side of the airframe, the space below the airframe can be widened, and other mechanisms and devices can be easily arranged on the lower side of the airframe.

[II]
(Constitution)
The second feature of the present invention resides in the following configuration in the riding type work vehicle of the first feature of the present invention.
The right linkage rod is located on the right lateral outside of the fuselage frame, and the left linkage rod is located on the left lateral outside of the fuselage frame.

(Function)
According to the second feature of the present invention, the “action” described in the preceding item [I] is provided in the same manner as the first feature of the present invention, and in addition to this, the following “action” is provided.
According to the second aspect of the present invention, the connection point between the right side portion of the steering member and the right linkage rod, and the connection point between the right knuckle arm and the right linkage rod are located on the right lateral outer side of the body frame. The connecting point between the left side of the steering member and the left connecting rod and the connecting point between the left knuckle arm and the left connecting rod are not only located on the left lateral outer side of the body frame, but also the right connecting rod. Is located on the right lateral outer side of the airframe frame, and the entire left linkage rod is located on the left lateral outer side of the airframe frame.
As a result, the right and left linkage rods do not cross the lower side of the fuselage frame at an angle, so the entire position of the right and left linkage rods must be lowered to avoid interference with the fuselage frame. It is possible to set the entire position of the right and left linkage rods to a high position.

(The invention's effect)
According to the second feature of the present invention, the “effect of the invention” described in the preceding item [I] is provided in the same manner as the first feature of the present invention. In addition, the following “effect of the invention” is provided. ing.
According to the second aspect of the present invention, since the entire right and left linking rods are located on the right and left lateral outer sides of the fuselage frame, the entire position of the right and left linking rods is set to a high position. (Minimum ground clearance in the vicinity of the right and left linkage rods can be increased), and the traveling performance of the passenger work vehicle can be improved.

[III]
(Constitution)
The third feature of the present invention resides in the following configuration in the riding type work vehicle of the second feature of the present invention.
The right and left elevating links that support the ground work device so as to be movable up and down are supported on the body frame so as to be swingable up and down. The right lifting link is located on the right lateral outside of the right linkage rod, and the left lifting link is located on the left lateral outside of the left linkage rod.

(Function)
According to the third feature of the present invention, as in the second feature of the present invention, the “action” described in the preceding paragraphs [I] and [II] is provided. In addition, the following “action” is provided. Yes.
In a passenger work vehicle, in general, right and left elevating links that support a ground work device (for example, a mower or the like) so as to freely move up and down are often supported on an airframe so as to be swingable up and down.
According to the third aspect of the present invention, since the right and left lifting links are located on the right and left lateral outer sides of the right and left linkage rods, the right and left lifting links and the right and left linkage rods are Without interference, the right and left lifting links swing up and down, and the right and left linkage rods push and pull.

(The invention's effect)
According to the third feature of the present invention, the “effect of the invention” described in the preceding paragraphs [I] and [II] is provided in the same manner as the second feature of the present invention. In addition, the following “effect of the invention” is provided. Is provided.
According to the third aspect of the present invention, when the right and left elevating links that support the ground working device are freely movable up and down, the right and left elevating links are vertically moved without interfering with each other. By swinging and pushing the right and left linkage rods, the ground working device can be supported without any trouble.

[IV]
(Constitution)
A fourth feature of the present invention resides in the following configuration in the passenger work vehicle of the third feature of the present invention.
A portion of the right lifting link located on the laterally outer side of the connection point between the right side portion of the steering member and the right linking rod is projected outwardly. A portion of the left elevating link located on the laterally outer side of the connection point between the left side portion of the steering member and the left linkage rod is projected outwardly.

(Function)
According to the fourth feature of the present invention, the “action” described in the preceding paragraphs [I] to [III] is provided in the same manner as the third feature of the present invention. In addition, the following “action” is provided. ing.
As described in [I] above, when the steering member is driven to swing around the vertical axis in conjunction with the operation of the steering handle, the right and left side portions of the steering member draw an arc locus in plan view. Become.

  According to the fourth feature of the present invention, the right and left lifting links located on the laterally outer side of the connection point between the right and left side portions of the steering member and the right and left linking rods project laterally outward. Interference between the right and left side portions of the steering member that draws the arc locus and the right and left lifting link portions can be avoided. In the parts of the right and left lifting links other than those described above, it is not necessary to consider interference with the right and left parts of the steering member that draws the arc locus, so it is necessary to approach the right and left linkage rods and the fuselage frame. It becomes possible to arrange.

(The invention's effect)
According to the fourth feature of the present invention, as in the third feature of the present invention, the “effect of the invention” described in the preceding paragraphs [I] to [III] is provided. In addition, the following “invention” is provided. Effect.
According to the fourth aspect of the present invention, the right and left lifting links are brought close to the right and left linkage rods and the body frame while avoiding interference between the right and left lifting portions of the steering member and the right and left lifting links. (It is not necessary to dispose the right and left lifting links away from the right and left linkage rods and the fuselage frame), which is advantageous in terms of overall compactness. It became.

  As shown in FIGS. 1 and 2, a mower 4 (corresponding to a ground work device) is supported at the lower center of a body frame 3 supported by the right and left front wheels 1 and the right and left rear wheels 2. A driver's seat 5 is provided at the upper rear part of the vehicle 3, and an engine 6 is supported on the front part of the airframe to constitute a riding mower as an example of a riding work vehicle.

  As shown in FIGS. 1, 3, and 4, the fuselage frame 3 is formed by bending a plate material and is arranged in the longitudinal direction of the fuselage. The fuselage frame 3 has a top plate portion 3 a, a right vertical wall portion 3 b, A vertical wall 3b is provided. The engine 6 is supported on the upper part of the front part of the body frame 3, and the muffler 10 is supported on the front part of the body frame 3 along the left-right direction.

  As shown in FIGS. 1 and 3, a bracket 8 is connected to the lower front portion of the body frame 3, and a front wheel support frame 9 is supported around the longitudinal axis P <b> 1 of the bracket 8 so as to be able to roll freely. A boss portion 9 a is connected to the right and left side portions of 9. The support shaft 11 is rotatably supported by the right and left boss portions 9a of the front wheel support frame 9, and the right and left front wheels 1 are freely rotatable by the bracket 11a connected to the lower ends of the right and left support shafts 11. The knuckle arms 11 b are connected to the upper ends of the right and left support shafts 11, and the knuckle arms 11 b of the right and left support shafts 11 are positioned above the front wheel support frame 9. The knuckle arms 11b of the right and left support shafts 11 are extended toward the right and left vertical wall portions 3b of the body frame 3, and the right and left support wheels are supported in the straight state of the right and left front wheels 1. The knuckle arm 11b of the shaft 11 faces obliquely forward.

  As shown in FIGS. 1, 3, and 4, a boss portion 12 is connected to a rear portion of the front wheel support frame 9 (right and left front wheels 1) in the body frame 3 via a bracket 13. A sector gear 14 (corresponding to a steering member) is supported in a substantially horizontal posture so as to be swingable around a longitudinal axis P2 of the twelve. A steering arm 15 (corresponding to a steering member) is connected to the lower part of the fan-shaped gear 14, and the right and left side portions of the steering arm 15 extend to the right and left laterally outer sides. It protrudes right and left laterally outward from the vertical wall 3b.

  As shown in FIGS. 1, 3, and 4, the steering shaft 16 is rotatably supported, the pinion gear 16 a at the lower end portion of the steering shaft 16 is engaged with the fan-shaped gear 14, and the steering shaft 16 is connected to the upper end portion of the steering shaft 16. A handle 17 is connected. A right linkage rod 18 is connected across the right side of the steering arm 15 and the knuckle arm 11b of the right support shaft 11, and across the left side of the steering arm 15 and the knuckle arm 11b of the left support shaft 11. The left linking rod 18 is connected, and the right and left linking rods 18 are located above the front wheel support frame 9.

  As a result, as shown in FIGS. 3 and 5, by rotating the steering handle 17, the steering arm 15 is driven to swing around the vertical axis P <b> 2 via the steering shaft 16 and the fan gear 14. . The state shown in FIG. 3 is a state in which the steering handle 17 is operated in a straight traveling state, and the steering arm 15 is substantially orthogonal to the body frame 3 in plan view.

  As shown in FIGS. 3 and 5, when the steering arm 15 is driven to rotate in the counterclockwise direction about the vertical axis P2 by rotating the steering handle 17, the right linkage rod is driven by the steering arm 15. 18 is pushed, the left linkage rod 18 is pulled, and the right and left front wheels 1 are steered to the right. When the steering arm 15 is driven to swing clockwise around the vertical axis P2, the right linking rod 18 is pulled by the steering arm 15 and the left linking rod 18 is pushed to operate the right and left The front wheel 1 is steered to the left.

  As shown in FIGS. 1, 3, and 4, the connection point between the right side of the steering arm 15 and the right linkage rod 18, the connection point between the knuckle arm 11b of the right support shaft 11 and the right linkage rod 18, the steering arm A ball-type joint 19 is used at a connection point between the left side portion 15 and the left linkage rod 18, and a connection point between the knuckle arm 11 b of the left support shaft 11 and the left linkage rod 18. Joints 19 (connection points) between the right and left side portions of the steering arm 15 and the right and left linking rods 18 are located on the upper side portions of the right and left side portions of the steering arm 15, and the right and left support shafts 11. The joint 19 (connection point) between the knuckle arm 11b and the right and left linking rods 18 is located on the lower side of the knuckle arm 11b of the right and left support shafts 11.

  As shown in FIGS. 1, 3, and 4, in a state where the steering handle 17 is operated in a straight traveling state, a connection point between the right side portion of the steering arm 15 and the right linkage rod 18, and a knuckle arm of the right support shaft 11. 11b and the right connecting rod 18 as well as the entire right connecting rod 18 are located on the right lateral outside of the right vertical wall 3b of the body frame 3 in plan view (see FIG. 3). It is located at the same height (or a slightly lower position) as the lower end of the right vertical wall 3b of the body frame 3 as viewed (see FIG. 1), and the right linking rod 18 is viewed in plan (see FIG. 3). It is in a state along the right vertical wall 3 b of the machine body frame 3.

  As shown in FIGS. 1, 3, and 4, in a state where the steering handle 17 is operated straight, the connection point between the left side portion of the steering arm 15 and the left linkage rod 18, and the knuckle arm of the left support shaft 11. 11b and the left connecting rod 18 and the entire left connecting rod 18 are located on the left lateral outer side of the left vertical wall 3b of the body frame 3 in a plan view (see FIG. 3). It is located at the same height (or slightly lower position) as the lower end of the left vertical wall 3b of the body frame 3 as viewed (see FIG. 1), and the left connecting rod 18 is viewed in plan (see FIG. 3). It is in a state along the left vertical wall 3b of the body frame 3.

  As shown in FIG. 3, the right and left connecting rods 18 are slightly bent in a “<” shape in plan view, and the middle portions of the right and left connecting rods 18 are the right and left vertical walls of the body frame 3. It is close to part 3b. The right and left linking rods 18 are slightly bent in a “<” shape in plan view, as described above, as the steering handle 17 is rotated, the right and left linking rods 18 are pushed and pulled. This is to avoid interference between the right and left lifting links 20 and the right and left linkage rods 18 described later when operated.

  As shown in FIGS. 1 and 3, a tie rod (not shown) is not connected across the knuckle arms 11b of the right and left support shafts 11, and the knuckle arms 11b of the right and left support shafts 11 are front wheels. The front wheel support frame 9 is the most in the vicinity of the front wheel support frame 9 due to the point located above the support frame 9 and the point where the right and left linkage rods 18 are located above the front wheel support frame 9. It is located on the lower side. Thereby, the minimum ground clearance near the front wheel support frame 9 is high, and the mowing performance of the tall grass by the mower 4 is high.

As shown in FIG. 5, for example, when the right and left front wheels 1 are largely steered to the right and the right and left front wheels 1 are returned to the straight traveling state, the steering handle 17 is to be rotated to the straight traveling state. As the steering arm 15 is driven to swing around the vertical axis P2, the right linkage rod 18 is pulled and the left linkage rod 18 is pushed.
In this case, the force for pulling the right linkage rod 18 is transmitted as a force for pushing the left linkage rod 18 via the steering arm 15, and conversely, the left linkage rod 18 is pushed. A force to be transmitted is transmitted as a force for pulling and operating the right linkage rod 18 via the steering arm 15.

  As a result, the right and left linkage rods 18 are in a state in which the force to be pushed and the force to be pulled are compensated for each other, and the rotation operation of the steering handle 17 to the straight traveling state becomes light. . Since the rotation operation of the steering handle 17 to the straight traveling state becomes light, the load applied to the steering shaft 16 and the fan gear 14 is reduced, and the durability of the steering shaft 16 and the fan gear 14 can be improved. The right and left front wheels 1 are less likely to damage the grass.

  As shown in FIGS. 1, 3, and 4, a bracket 21 is connected to the front part of the right and left vertical wall portions 3 b of the body frame 3, and the right and left lifting links 20 are swingable up and down with respect to the bracket 21. A bracket 4a that is supported and extends rearward along the right and left vertical wall portions 3b of the body frame 3 and is connected to the rear portion of the mower 4 is attached to the rear end portions of the right and left lifting links 20. It is connected. A bracket 20b is connected to an intermediate portion of the right and left lifting links 20, and the crank-shaped support link 22 is seen around the horizontal axis P3 of the bracket 20b of the right and left lifting links 20 in a plan view (see FIG. 3). It is integrally supported so as to be swingable. One end portion of the support link 22 is connected to the right and left vertical wall portions 3 b of the body frame 3, and the support link 23 extends across the bracket 4 b connected to the front portion of the mower 4 and the other end portion of the support link 22. Is connected.

  In this case, as shown in FIGS. 1, 3, and 4, the right lifting link 20 is located on the right lateral outside of the right linkage rod 18, and the left lifting link 20 is located on the left lateral outside of the left linkage rod 18. It is comprised so that it may be located in. On the laterally outer side of the joint 19 (connection point) between the right side portion of the steering arm 15 and the right linkage rod 18, the right lifting link 20 is provided with an overhanging portion 20 a that projects to the right lateral side, and the left side of the steering arm 15. On the laterally outer side of the joint 19 (connection point) between the part and the left linking rod 18, the left lifting link 20 is provided with an overhanging part 20 a that projects to the left laterally outer side.

  As shown in FIGS. 1 and 3, an operating shaft 24 is rotatably supported around the horizontal axis P4 at the rear portion of the body frame 3, and an arm 24a is connected to the right and left sides of the operating shaft 24. A support link 25 is connected across the arm 24a of the shaft 24 and the rear ends of the right and left lifting links 20. An operation lever 26 is connected to the operation shaft 24, and a dial-type height adjuster 27 is provided below the driver seat 5.

  As shown in FIGS. 1 and 3, by rotating the operation shaft 24 with the operation lever 26, the mower 4 can be moved up and down via the right and left lifting links 20 and the support links 22, 23, and 25. Therefore, the operation lever 26 and the operation shaft 24 are configured to be held at the highest position of the mower 4. The height adjuster 27 determines the lowering limits of the operating lever 26 and the operating shaft 24 by contact, and the lowering limits of the operating lever 26 and the operating shaft 24 can be changed by the height adjusting tool 27. As a result, the height of the mower 4 relative to the body frame 3 is set by operating the operation lever 26 and the operation shaft 24 from the most elevated position of the mower 4 to the lowering side so as to contact the height adjuster 27. Can do.

Overall side view of riding mower Overall plan view of a riding mower Overall plan view showing the arrangement of fan-shaped gears, steering arms, right and left linkage rods, right and left knuckle arms, right and left lifting links, etc. in a state where the steering handle is operated in a straight traveling state A longitudinal front view showing the vicinity of the fan-shaped gear and the steering arm in a state where the steering handle is operated straightly. Overall plane showing the arrangement of fan gears, steering arms, right and left linkage rods, right and left knuckle arms, right and left lifting links, etc. with the right and left front wheels steered to the right. Figure

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front wheel 3 Airframe frame 4 Ground work apparatus 11b Knuckle arm 14,15 Steering member 17 Steering handle 18 Linking rod 20 Lifting link P2 Vertical axis core

Claims (4)

The right and left front wheels are steerable on the right and left lateral outer sides of the body frame arranged in the longitudinal direction of the body, and the right and left knuckle arms provided on the right and left front wheels are mounted on the body frame. Extending towards
A steering member that is driven to swing around the vertical axis in conjunction with the operation of the steering handle is provided on the fuselage frame behind the right and left front wheels,
Connecting the right linkage rod across the right side of the steering member and the right knuckle arm, connecting the left linkage rod across the left side of the steering member and the left knuckle arm,
The connection point between the right side portion of the steering member and the right linkage rod, and the connection point between the right knuckle arm and the right linkage rod are located on the right lateral outer side of the body frame,
A connection point between the left side portion of the steering member and the left linkage rod, and a connection point between the left knuckle arm and the left linkage rod are configured to be located on the left lateral outer side of the body frame. Passenger work vehicle.   2. The riding type work vehicle according to claim 1, wherein the right linking rod is positioned on a right lateral outer side of the body frame, and the left linking rod is positioned on a left lateral outer side of the body frame. The right and left lifting links that support the ground work device so as to be able to move up and down are supported on the machine frame so as to swing up and down,
The riding according to claim 2, wherein the right elevating link is located on the right lateral outer side of the right linking rod, and the left elevating link is located on the left lateral outer side of the left linking rod. Type work vehicle. The right lifting link portion located on the laterally outer side of the connection point between the right side portion of the steering member and the right linkage rod is projected laterally outward.
The riding type work vehicle according to claim 3, wherein a portion of the left elevating link located on the laterally outer side of the connection point between the left side portion of the steering member and the left linking rod is projected to the laterally outer side.

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