JP3884532B2 - Power steering cylinder mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a power steering system in which one of front wheels or rear wheels of a traveling vehicle is a driving wheel and the other is a steering wheel, and the steering wheel is rotated by a power steering cylinder for steering. It relates to the mounting structure of the cylinder.
[0002]
[Prior art]
Conventionally, a power steering device is attached to a traveling vehicle in order to reduce steering operation force. The power steering device supplies oil according to the rotation of the handle to the power steering cylinder, expands and contracts the movable side of the power steering cylinder, and rotates the steering wheel left and right. In these techniques, the power steering cylinder is provided between the frame and the front axle case, and the power steering cylinder is provided in the vicinity of the front axle and pivotally attached to the front axle via a universal joint or the like. Further, the support member of the power steering cylinder and the knuckle arm stopper member are separate members.
[0003]
[Problems to be solved by the invention]
When the power steering cylinder is arranged between the frame and the front axle case as described above, the cylinder thrust is applied to the front axle case, and the front axle case is subjected to force in the front-rear direction, so that the center pin portion that supports the front axle case It was a burden. Further, when the power steering cylinder is provided in the vicinity of the front axle, the tire interferes with the cylinder, and the cutting angle of the tire cannot be increased. For this reason, universal joints were used, but when the power steering cylinder was pivotally attached to the front axle case via a universal joint (ball joint), etc., the number of parts increased, and space was increased. It was. Further, since the power steering cylinder support member and the knuckle arm stopper member are separate members, the thrust of the cylinder is applied to the front axle case, and it is necessary to increase the strength of the front axle case.
[0004]
[Means for Solving the Problems]
The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.
In a traveling vehicle in which a power steering cylinder (10) is attached to a front axle case (15) and a cylinder rod (10a) of the power steering cylinder (10) is pivotally attached to a knuckle arm (23), the front axle case (15 ), A cylinder support bracket (30) having a substantially U-shape in side view is fixed to the rear of one side with the rear opened, and bosses (10c) are formed above and below the center of the outer periphery of the power steering cylinder (10). 10c), and the bosses (10c, 10c) are pivotally supported in the vertical direction of the cylinder support bracket (30) , and the bosses (10c, 10c) are provided on the power steering cylinder (10). substantially disposed in an intermediate position, on one side behind the front axle case (15), said furo Along the longitudinal direction of the bets axle casing (15) arranged power cylinder (10), a take-out port of the hydraulic hoses (6) of the power steering cylinder (10) (10b), said power cylinder (10) The hydraulic hose (6) is attached and arranged at the end opposite to the pivoting portion with respect to the knuckle arm (23) so that the hydraulic hose (6) faces obliquely upward, and the front side of the cylinder support bracket (30) has a kingpin ( 16) and fixed to the substantially intermediate position of the center pin (14), also integrally fixed to the knuckle arm stopper (40) on the front side of the cylinder support bracket (30), said knuckle arm stopper (40 ) Is fixed to the lower surface of the front axle case (15), and the knuckle arm stopper (40) It is obtained by forming the rotation regulating portion during rotation of Kkuruamu (23).
DETAILED DESCRIPTION OF THE INVENTION
[0005]
An embodiment of the present invention will be described. 1 is a side view of the lawn mower, FIG. 2 is a side view showing the installation of the power steering cylinder of the present invention, FIG. 3 is a front view, FIG. 4 is a right front view, FIG. 5 is a right plan view, and FIG. FIG. 7 is a plan view showing attachment to the front axle case by integrating the cylinder support bracket and the knuckle arm stopper.
[0006]
In FIG. 1, the entire construction of a lawn mower A equipped with a mower M and a catcher box B to which the power steering cylinder mounting structure of the present invention is applied will be described. A mower M is suspended from an abdomen between the front wheels 11 and 11 and the rear wheels 12 and 12 of the traveling machine body via an elevating mechanism so that the elevating operation can be performed at the driver's seat. The mower M is supported by providing a front support wheel 32 at the front and a rear guide wheel 33 at the rear to support the cutting height so that the mowing height can be adjusted. I run and do the cutting work.
[0007]
Further, an engine E is placed in the hood 1 on the front part of the body frame 5, and the rear wheels 12 and 12 are driven by the power from the engine E via a transmission. Further, power is transmitted from the front PTO shaft of the front axle case to the gear box 27 provided on the upper portion of the mower M via the universal joint 17, and the rotary blade and the lower gear S that are shifted by the gear box 27 are driven. The lower S is disposed on the right side of the seat, and the lawn cut by the mower M is discharged to the lower S, and the blade of the lower S is rotated to the inlet of the catcher box B through the connecting hose 21. Is transported.
[0008]
A dashboard 2 is disposed at the rear of the bonnet 1, and a handle 3 projects from the dashboard 2. A switching valve is disposed below the rotation shaft of the handle 3 and is connected to the switching valve via a power steering cylinder 10 and a hydraulic pump, which will be described later, via a hydraulic pipe 6. The power steering cylinder 10 can be expanded and contracted.
[0009]
Next, a power steering cylinder mounting structure, which is a main part of the present invention, will be described with reference to FIGS. 2, 3, 4, and 5. FIG. Support plates 12 and 13 having a substantially inverted L shape when viewed from the side are fixed to the front and lower portions of the front frame 5 in the left-right direction in parallel with the front and rear in the traveling direction. The axle case 15 is supported at a substantially central portion in the left-right direction of the vehicle body, and the front axle case 15 is configured to be tiltable left and right.
[0010]
An input shaft 21 extending in the longitudinal direction of the vehicle body is rotatably supported on the shaft center portion of the center pin 14 at the center portion of the front axle case 15 in the left-right direction, and the rear portion of the input shaft 21 is a universal joint and a transmission shaft. The power is transmitted to the mower M provided below the seat through the seat. Further, king pins 16 and 16 are rotatably inserted into insertion pipes 15a and 15a provided on both ends of the front axle case 15, and front wheels 11 and 11 are pivotally supported on the king pins 16 and 16, respectively. The knuckle arms 29 and 29 are fixed to 16 and 16, and the tie rod 24 is pivoted between the knuckle arms 29 and 29 so that the left and right front wheels 11 and 11 can simultaneously rotate in the same direction. Further, one end side of the arm 23 is fixed to the king pin 16 on the right side in the traveling direction of the machine body, and the cylinder rod 10a of the power steering cylinder 10 is pivotally connected to the other end side of the arm 23.
[0011]
As shown in FIGS. 6 and 7, a cylinder support bracket 30 configured in a substantially U shape in side view is fixed to the right rear of the front axle case 15 with the rear opened, and on the other hand, the outer periphery of the power steering cylinder 10 is fixed. The bosses 10c and 10c are fixed on the top and bottom of the central portion, and bolts 35 and 35 are inserted into the bosses 10c and 10c from above and below the cylinder support bracket 30 so that the power steering cylinder 10 can be rotated from above and below. I support it.
[0012]
The power steering cylinder 10 is a double rod type cylinder in which cylinder rods 10a protrude from the left and right sides, so that the left and right operation sensations are the same and the operability when traveling through the airframe is improved. In addition, a power steering cylinder 10 is disposed on the right rear side of the front axle case 15 and along the longitudinal direction. When viewed from the front of the body, the power steering cylinder 10 is behind the front axle case 15. The power steering cylinder 10 can be prevented from hitting an obstacle or the like and being damaged when the aircraft is moving forward. When the mower M attached to the tractor is attached / detached, the mower M is usually attached / detached from the left side of the airframe, so that the power steering cylinder 10 disposed on the right side of the airframe is not obstructed. Work can be done.
[0013]
Further, a hydraulic hose take-out port 10b is provided at an end portion on the opposite side (rear side) to the pivoting portion of the cylinder, and the hose is provided so as to face obliquely upward. Therefore, the hydraulic hose 6 is not excessively bent, and even when the front wheel tire 11 is damaged, the hydraulic hose 6 is disposed away from the front wheel tire 11 and is not damaged. Further, the pivot point of the power steering cylinder 10 is provided at a position approximately in the middle of the power steering cylinder 10 on the power steering cylinder 10 side, and at a position approximately in the middle of the king pin 16 and the center pin 14 on the front axle 15 side. Even if the axle case 15 swings in the vertical direction, since the fulcrum is located outside the mower lifting link, it is not necessary to move the horizontal position of the mower lifting device.
[0014]
Further, the front axle case 15 is bent at both ends upward in a front view, and king pins 16 and 16 are inserted into insertion pipes 15 a and 15 a provided at both ends of the front axle case 15. The king pin 16 is provided with a camber angle C so that the king pin 16 and the power steering cylinder 10 are perpendicular to each other. It is no longer necessary to use a universal joint (ball joint) or the like for absorbing the angle difference, and the structure becomes simple and can be manufactured at low cost.
[0015]
Further, as shown in FIG. 5, even when the cylinder rod 10a of the power steering cylinder 10 is most contracted, a part of the cylinder rod 10a protrudes from the main body of the power steering cylinder 10. Therefore, since the outer peripheral portion 11a of the front wheel tire 11 closest to the cylinder 10 approaches the space between the main body and the pivoting portion of the power steering cylinder 10 at the maximum cutting angle of the front wheel tire 11, the front wheel tire 11 is The cutting angle of the front tire 11 can be secured without interfering with the power steering cylinder 10. Thus, as in the prior art, in order to avoid the power steering cylinder, there is no need for means for securing the cutting angle of the front tire 11 using a universal joint (ball joint) or the like.
[0016]
As shown in FIGS. 5 to 7, a knuckle arm stopper 40 is integrally fixed to the front surface of a cylinder support bracket 30 for pivotally supporting the power steering cylinder 10 to form a subassembly. The rear surface of the cylinder support bracket 30 and the upper surface of the knuckle arm stopper 40 are fixed to the front axle case 15. As a result, the strength of the front axle case 15 can be improved, and the cylinder thrust can be applied without burdening the center pin 14. In addition, since the space before and after the front axle case 15 can be afforded, the layout of the front PTO and the like is facilitated.
[0017]
In addition, whether or not the power steering is attached can be selected depending on whether or not the sub-assembly is attached, the specification can be easily changed, and the versatility of the front axle case 15 is enhanced. Since only the sub-assembly member needs to be newly produced and attached to the standard front axle case 15, simplification can be achieved without increasing the number of power steering dedicated parts, and cost increases can be suppressed. It is. Further, by reducing the number of parts used, the dimensional accuracy can be improved and the tire turning angle accuracy can be improved.
[0018]
The knuckle arm stopper 40 is bent slightly outward so as to avoid the arm 23, a stopper pin 40a is fixed in the vertical direction at the tip, and a notch 40b is formed in the rear surface of the middle part. When the power steering cylinder 10 is expanded and contracted, the arm 23 is in contact with the power steering cylinder 10 to restrict the rotation.
[0019]
With the above configuration, when the handle 3 is rotated, the switching valve at the base of the handle 3 is switched, and the pressure oil from the hydraulic pump is fed from the oil chamber on the extension side or the reduction side of the power steering cylinder 10. Thus, the cylinder rod 10a is driven to extend or contract, whereby the knuckle arm 23 is rotated, and the front wheel 11 is rotated left and right to steer the machine body. Since the power steering cylinder 10 is behind the front axle case 15, it is protected from obstacles on the ground during traveling.
[0020]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
In a traveling vehicle in which a power steering cylinder (10) is attached to a front axle case (15) and a cylinder rod (10a) of the power steering cylinder (10) is pivotally attached to a knuckle arm (23), the front axle case (15 ), A cylinder support bracket (30) having a substantially U-shape in side view is fixed to the rear of one side with the rear opened, and bosses (10c) are formed above and below the center of the outer periphery of the power steering cylinder (10). 10c), and the bosses (10c, 10c) are pivotally supported in the vertical direction of the cylinder support bracket (30) , and the bosses (10c, 10c) are provided on the power steering cylinder (10). substantially disposed in an intermediate position, on one side behind the front axle case (15), said furo Along the longitudinal direction of the bets axle casing (15) arranged power cylinder (10), a take-out port of the hydraulic hoses (6) of the power steering cylinder (10) (10b), said power cylinder (10) The hydraulic hose (6) is attached and arranged at the end opposite to the pivoting portion with respect to the knuckle arm (23) so that the hydraulic hose (6) faces obliquely upward, and the front side of the cylinder support bracket (30) has a kingpin ( 16) and fixed to the substantially intermediate position of the center pin (14), also integrally fixed to the knuckle arm stopper (40) on the front side of the cylinder support bracket (30), said knuckle arm stopper (40 ) Is fixed to the lower surface of the front axle case (15), and the knuckle arm stopper (40) Since the formation of the rotation restricting portion at the time of rotation of the Kkuruamu (23), the burden on the front axle case is not applied.
[0021]
Further, the power steering cylinder is arranged on the right rear side in the traveling direction of the front axle case, a hydraulic hose take-out port is provided in the power steering cylinder, and the pivot point of the power steering cylinder is arranged between the king pin and the center pin. As a result, the power steering cylinder is reduced from being damaged by hitting an obstacle or the like.
[0022]
As shown in FIGS. 5 to 7, a knuckle arm stopper 40 is integrally fixed to the front surface of a cylinder support bracket 30 for pivotally supporting the power steering cylinder 10 to form a subassembly. The rear surface of the cylinder support bracket 30 and the upper surface of the knuckle arm stopper 40 are fixed to the front axle case 15. As a result, the strength of the front axle case 15 can be improved, and the cylinder thrust can be applied without burdening the center pin 14.
In addition, since the space before and after the front axle case 15 can be afforded, the layout of the front PTO and the like is facilitated.
[0023]
In addition, whether or not the power steering is attached can be selected depending on whether or not the sub-assembly is attached, the specification can be easily changed, and the versatility of the front axle case 15 is enhanced. Since only the sub-assembly member needs to be newly produced and attached to the standard front axle case 15, simplification can be achieved without increasing the number of power steering dedicated parts, and cost increases can be suppressed. It is. Further, by reducing the number of parts used, the dimensional accuracy can be improved and the tire turning angle accuracy can be improved.
[Brief description of the drawings]
FIG. 1 is a side view of a lawn mower.
FIG. 2 is a side view showing attachment of the power steering cylinder of the present invention.
FIG. 3 is a front view of the same.
FIG. 4 is also a right front view.
FIG. 5 is also a right plan view.
FIG. 6 is a side view showing attachment of the cylinder support bracket to the front axle case.
FIG. 7 is a plan view showing attachment to a front axle case by integrating a cylinder support bracket and a knuckle arm stopper.
[Explanation of symbols]
5 Frame 6 Hydraulic hose 10 Power steering cylinder 10a Cylinder rod 10b Hydraulic port 11 Front wheel tire 14 Center pin 15 Front axle case 16 Kingpin 30 Cylinder support bracket 40 Knuckle arm stopper

Claims (1)

In the traveling vehicle in which the power steering cylinder (10) is attached to the front axle case (15) and the cylinder rod (10a) of the power steering cylinder (10) is pivotally attached to the knuckle arm (23),
A cylinder support bracket (30) having a substantially U-shape in a side view is fixed to one side rear of the front axle case (15) with the rear opened, and a central portion of the outer periphery of the power steering cylinder (10). The bosses (10c, 10c) are formed on the upper and lower sides of the cylinder support bracket, and the bosses (10c, 10c) are pivotally supported from the vertical direction of the cylinder support bracket (30). A power steering cylinder (10) is arranged at a position substantially in the middle of the steering cylinder (10), and is located behind one side of the front axle case (15) along the longitudinal direction of the front axle case (15) . the take-out port of the hydraulic hose (6) (10b) of said power cylinder (10), the power steering cylinder ( The end opposite to the pivot portion to the knuckle arm (23) of 0), the hydraulic hose (6) is attached arranged so as to face obliquely upward, the front side of the cylinder support bracket (30), The knuckle arm stopper (40) is fixed to a substantially intermediate position between the king pin (16) and the center pin (14), and a knuckle arm stopper (40) is integrally fixed to the front side of the cylinder support bracket (30). The upper surface of (40) is fixed to the lower surface of the front axle case (15), and the knuckle arm stopper (40) is formed with a rotation restricting portion when the knuckle arm (23) is rotated. Power steering cylinder mounting structure.

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