JP2014148305A - Self-propelled vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self-propelled vehicle capable of protecting a power steering mechanism with a protective member on which mud or the like does not accumulate.SOLUTION: In a self-propelled vehicle including a hydraulic mechanism ps that changes the direction of right and left wheels according to a manipulation performed on a steering wheel, a rod-like protective member 171 is disposed in front of the hydraulic mechanism ps along the hydraulic mechanism ps. The hydraulic mechanism ps includes a piston rod 152 coupled to the right and left wheels and movable to the right and left, has support members 173A and 173B at respective ends of the piston rod 152, and causes the support members 173A and 173B to support the protective member 171. The protective member 171 can be freely rotated with respect to the support members 173A and 173B via an elastic member 174.

Description

  The present invention relates to a self-propelled vehicle including a power steering mechanism that changes directions of left and right tires by operating a steering wheel.

  A conventional tractor includes a power steering mechanism (hydraulic mechanism) that changes the directions of the left and right front tires by operating a handle. The power steering mechanism includes a cylinder and a piston with a rod, and moves the piston by flowing hydraulic oil into and out of the cylinder. And the direction of a tire is changed by moving a rod.

  However, in such a power steering mechanism, the cylinder and the rod are exposed, and there is a concern that the vehicle will hit an obstacle such as a dead branch that has fallen on the road surface during running and may be damaged. Therefore, a technique for protecting the front, upper, lower and rear of the power steering mechanism with a box-shaped cover has been proposed.

Japanese Utility Model Publication No. 63-57173

  However, it is not easy to remove such a technique once mud (and accompanying organic matter) enters the protective cover due to mud splashes from the road surface. For this reason, mud accumulates in the protective cover, which not only hinders the operation of the power steering mechanism, but there is a risk that the accumulated mud or the like will corrode the protective cover and the power steering mechanism. Therefore, the present invention is to provide a self-propelled vehicle that can protect the power steering mechanism with a protective member that does not accumulate mud or the like.

For this reason, the present invention provides a self-propelled vehicle including a hydraulic mechanism that changes the directions of the left and right wheels by operating the steering wheel.
A rod-shaped protection member is provided in front of the hydraulic mechanism and along the hydraulic mechanism,
The hydraulic mechanism has a piston rod connected to the left and right wheels and movable to the left and right,
A support member is provided at each end of the piston rod, and the support member supports the protection member,
The protection member is configured to be rotatable with respect to the support member via an elastic member.

  Furthermore, the self-propelled vehicle according to the present invention is characterized in that a plurality of the protective members are provided in the vertical direction.

  Furthermore, in the self-propelled vehicle according to the present invention, the protection member is a cylinder, and both ends of the protection member are supported by the support member via the elastic member, and the wire penetrates into the cylinder. The cylinder is rotatably supported.

  Furthermore, in the self-propelled vehicle according to the present invention, the protection member is a cylinder, and the elastic member is supported at both ends by the support member and penetrates into the cylinder so that the cylinder can freely rotate. It is characterized by supporting.

  Furthermore, in the self-propelled vehicle according to the present invention, the protection member is composed of a plurality of cylinders, and the cylinders are arranged in series.

  According to the present invention, in a self-propelled vehicle including a hydraulic mechanism that changes the directions of the left and right wheels by operating a handle, the rod-shaped protection member is provided in front of the hydraulic mechanism and along the hydraulic mechanism. The hydraulic mechanism has a piston rod that is connected to the left and right wheels and is movable left and right, and provided with support members at both ends of the piston rod, and the support member supports the protection member, The protection member is configured to be rotatable with respect to the support member via an elastic member.

  Therefore, it is possible to provide a self-propelled vehicle that can protect the hydraulic mechanism from obstacles during traveling. Further, since the protective member is formed in a rod shape and the structure is simple, even if mud splashes or the like occur during traveling, the splashed mud does not accumulate in the protective member. For this reason, the self-propelled vehicle which can protect the protection member itself which has been a problem from the past, and the hydraulic mechanism adjacent to the protection member from corrosion, and has a protection portion (and a hydraulic mechanism) with improved durability. Can be provided. Moreover, since the protective member moves integrally with the piston rod, the hydraulic mechanism can be reliably protected from obstacles. Further, even when grass or the like is likely to be entangled with the protective member, the protective member can freely rotate to prevent this. Further, even when the obstacle gives a strong impact to the protective member, the elastic member bends so that the impact can be mitigated and the protective member can be prevented from being damaged.

  Furthermore, according to the present invention, since a plurality of the protective members are provided in the vertical direction, even if one protective member is broken, another protective member can protect the hydraulic mechanism.

  Further, according to the present invention, the protection member is a cylinder, and a wire supported by the support member at both ends via the elastic member is provided, and the wire penetrates into the cylinder, Support for rotation.

  Therefore, even when grass or the like is likely to be entangled with the protective member, the cylinder can freely rotate to prevent this, and with a simple structure, the self-propelled can prevent the grass and the like from being entangled with the protective member. A type vehicle can be provided. Further, even when the obstacle gives a strong impact to the protective member, the elastic member bends so that the impact can be mitigated and the protective member can be prevented from being damaged. In addition, since a constant tension is always applied to the elastic member, even when the obstacle comes into contact with the protective member, the protective member bends with a repulsive force and prevents the obstacle from coming into direct contact with the hydraulic mechanism. Can do.

  Furthermore, according to the present invention, the protection member is a cylinder, and the elastic member is supported at both ends by the support member, penetrates into the cylinder, and rotatably supports the cylinder.

  Therefore, even when grass or the like is likely to be entangled with the protective member, the cylinder can freely rotate to prevent this, and with a simple structure, the self-propelled can prevent the grass and the like from being entangled with the protective member. A type vehicle can be provided. Further, even when the obstacle gives a strong impact to the protective member, the elastic member bends so that the impact can be mitigated and the protective member can be prevented from being damaged. In addition, since a constant tension is always applied to the elastic member, even when the obstacle comes into contact with the protective member, the protective member bends with a repulsive force and prevents the obstacle from coming into direct contact with the hydraulic mechanism. Can do.

  Further, according to the present invention, the protective member is composed of a plurality of cylinders, and the cylinders are arranged in series, so that the cylinder can freely rotate even when grass or the like is likely to be entangled with the protective member. This can be prevented. Accordingly, it is possible to provide a self-propelled vehicle that prevents grass and the like from being entangled with the protective member with a simple configuration.

It is a side view of the tractor as an example of the self-propelled vehicle of this invention. It is the partially expanded plan view. It is a principal part front view of FIG. (A) is a principal part right perspective view of FIG. 3, (b) is a principal part side view of FIG. 3A is a left perspective view of a main part of FIG. 3, FIG. 3B is a perspective view of a protection rod, FIG. 3C is a plan view of a mounting plate, and FIG. It is a partial expansion perspective view of the protection member of another example of this invention. 6A is a perspective view of a power steering mechanism and a power steering protector provided in front of the power steering mechanism, and FIG. 6B is a side view of an essential part showing attachment of a piston rod, a bracket, and a connecting portion. ) Is a front view of the end of the piston rod, (d) is a front view of the end of the bracket, and (e) is an enlarged side view of the main part of the power steering protector. (A), (b), (d) is a perspective view which shows another example of the protection member of this invention, (c) is a principal part schematic plan view of (b).

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 shows a side view of a tractor 10 as a self-propelled vehicle of the present invention, and FIG. 2 shows a partially enlarged plan view of the tractor 10. The tractor 10 includes an engine, a radiator, an air cleaner, a battery, and the like in a bonnet 11. Further, the front portion of the bonnet 11 includes a headlamp 12, a front grill 13 for intake air, a side lamp L that illuminates the front of a front wheel 15 described later, and the like.

  The engine, radiator, and battery are mounted on a chassis (body frame) 14. The front wheels (wheels) 15 are attached to the chassis 14 via the front axle 17. The rear wheel 16 is attached to the chassis 14 via a rear axle and a rear axle housing (both not shown). A hydraulically operated power steering mechanism (hydraulic mechanism) ps is horizontally provided in front of the front axle 17. The power steering mechanism ps is for changing the direction of the left and right front wheels 15 when a steering handle (handle) 21 described later is rotated.

  A dashboard 18 is provided behind the bonnet 11, and a meter panel 19 for displaying speed and the like is provided on the dashboard 18. A steering column cover 20 is provided continuously to the dashboard 18. A steering handle 21 protrudes from the upper end of the steering column cover 20. On the upper side surface of the steering column cover 20, a reverser lever 22, an accelerator lever 23, a work implement elevating lever, and the like that project forward / backward movement of the machine body are provided. Below the steering column cover 20, a left brake pedal (operation unit) 24A, a right brake pedal (operation unit) 24B, a clutch pedal (operation unit) 25, and the like are provided.

  A driver's seat floor (floor) 26 is provided below the steering column cover 20. The driver's seat floor 26 has a substantially flat shape so that the driver can easily put his / her feet on it, and is provided with anti-slip processing by rubber or the like. Below the driver's seat floor 26, a transmission case M having a transmission is disposed. The transmission is for transmitting the driving force of the engine to the rear wheels 16 and is disposed in the front-rear direction at the center in the width direction of the tractor 10. A step st for the driver to get on and off the driver's seat floor 26 is provided at the left end of the driver's seat floor 26 (may be on both ends).

  A driver seat 27 is provided behind the driver seat floor 26. The driver seat 27 is provided above the rear wheel 16 at a position higher than the driver seat floor 26. Fenders 28 that cover the rear wheel 16 from above are provided on both sides of the driver seat 27. On the left fender 28 of the driver's seat 27, an ultra-low speed lever, a main transmission lever 29, a PTO lever, etc. are projected, and on the right fender 28, an SCV lever 30, a position lever, a PTO on / off switch, etc. Is provided. At the rear ends of the left and right fenders 28, a combination lamp in which a direction indicator and a tail lamp are integrated is provided.

  A ROPS frame (safety frame) 31 is provided behind the driver seat 27. The ROPS frame 31 is provided so as to rise upward from a rear axle case (not shown). The ROPS frame 31 can be folded backward at the hinge portion 31a according to the driver's selection. A reflective tape (not shown) is wound around the vertical frame 31v of the ROPS frame 31. This reflective tape is for reflecting light from the vehicle behind.

  A canopy may be attached to the top of the ROPS frame 31. The canopy covers the driver's seat 27 and is used for purposes such as sun protection and rain protection.

  A fuel tank is provided behind the driver seat 27 and below the ROPS frame 31. The fuel tank is covered with a tank cover 32, and the fuel filler 33 is exposed from the tank cover 32.

  And the link mechanism for attaching a working machine is provided in the rear part of the tractor 10. FIG. The link mechanism is composed of a top link 40 positioned substantially at the center of the rear surface of the tractor 10 and a pair of lower links 41 positioned on both sides of the lower portion. The link mechanism is pivotally attached to the chassis 14. Further, a PTO shaft 42 for transmitting the driving force of the engine to the work machine is also provided at the rear portion of the tractor 10.

  3, 4 (a) and 4 (b) show further essential parts of the present invention. The power steering mechanism ps is provided in front of the front axle 17 in front view and substantially parallel to the front axle 17. The power steering mechanism ps is located below the chassis 14 and 14 (the chassis 14 and 14 are provided in parallel with the center of the tractor 10 in the vehicle width direction when viewed from the front) and the chassis 14. , 14 in a direction substantially perpendicular to the longitudinal direction (traveling direction of the tractor 10). The chassis 14 and 14 are each provided with a notch 14a for avoiding the power steering mechanism ps.

  The power steering mechanism ps penetrates the cylinder 51 provided in the substantially center of the tractor 10 in the vehicle width direction (between the chassis 14 and 14), a piston (not shown) that moves hydraulically in the cylinder 51, and the piston. And a single piston rod 52 or the like. Pipes are connected to the left and right ends of the cylinder 51 (not shown), and hydraulic oil flows in and out of an oil port (not shown) through the pipe to move the piston.

  The piston is fixed at the approximate center in the longitudinal direction of the piston rod 52. Therefore, when the piston moves in the left-right direction (the width direction of the tractor 10) in the cylinder 51 by hydraulic pressure, the piston rod 52 is also slid left and right in conjunction with this. Both ends of the piston rod 52 are attached to one end of the connecting portion J (a male screw is formed at the tip of the piston rod 52, and a female screw that engages with the male screw is formed in the connecting portion J. Then, the piston rod 52 is fixed to the connecting portion J by screwing the piston rod 52). One end of a connecting rod 55 is attached to the other end of the connecting portion J. The other end of the connecting rod 55 is tapered and is connected to the side portion of the steering rod end 56.

  The upper surface of one end of the arm 57 is fixed to the lower end of the steering rod end 56. On the other hand, the other end of the arm 57 is fixed to a rotating case 58 (see FIG. 5A). The rotation case 58 is attached to the wheel 15W so as to enter the inside of the wheel 15W of the front wheel 15 (the wheel 15W is rotatable with respect to the rotation case 58). Reference numeral 60 denotes a kingpin. A protective rod (bar-shaped protective member) 71 is provided in front of the power steering mechanism ps.

  The protection rod 71 is formed by forming a through hole 14h slightly larger than the outer diameter of the protection rod 71 in each of the pair of chassis 14 and 14 formed of an iron plate and penetrating the protection rod 71 therethrough. The through hole 14h is formed slightly in front of the notch 14a of the chassis 14 (the traveling direction of the tractor 10). Specifically, the position of the through hole 14h is formed so as to overlap with the power steering mechanism ps when viewed from the front when the protective rod 71 is installed.

  5A to 5D show details of the protective rod 71. FIG. A mounting plate (bracket) 71a is fixed to the protection rod 71 by welding or the like. A round hole (slightly larger than the protective rod 71) 71c is provided in the lower portion of the mounting plate 71a, and the protective rod 71 is passed therethrough. Then, the protective rod 71 and the mounting plate 71a are connected by welding or the like. A screw hole 71d for passing the bolt 71b is formed in the upper part of the mounting plate 71a. On the other hand, a screw hole 14g for allowing the bolt 71b to pass therethrough is formed slightly above the through hole 14h formed in the chassis 14 on the left side (disposed on the left side in the traveling direction of the tractor 10). The center distance L1 between the round hole (passing through the protective rod 71) 71c formed in the mounting plate 71a and the screw hole 71d and the center distance L2 between the through hole 14h and screw hole 14g formed in the chassis 14 are: Needless to say, they are identical.

  Then, the right end 71R of the protection rod 71 is inserted from the outside into the through hole 14h of the chassis 14 on the left side (toward the traveling direction of the tractor 10), and then inserted into the through hole 14h of the right chassis 14 from the inside. Then, the mounting plate 71a is brought into contact with the left chassis 14 from the outside. Further, the bolt 71 b is inserted into the screw hole 71 d from the outside of the mounting plate 71 a, penetrates to the inside of the chassis 14 and is tightened with a nut, and the protection rod 71 is attached to the chassis 14.

  Therefore, the protection rod 71 is also restricted from moving in the longitudinal direction, and does not come out of contact with an obstacle.

  When the tractor 10 having the protection rod 71 configured as described above encounters an obstacle such as a tree branch while traveling, the protection rod 71 is located in front of the power steering mechanism ps. The steering mechanism ps can be protected.

  Note that a plurality of protective rods 71 may be provided instead of one. In this case, it shall equip with the vertical direction by a front view.

  In this example, the protection rod 71 is configured with a length that protects the cylinder 51 and the piston rod 52, but the present invention is not limited to this, and the connection rod 55 can also be protected. You may comprise in length.

  6 and 7 show another example of the protective member of the present invention. In this example, the configuration other than the form of the protective member is the same as that of the above-described example, and thus the description thereof is omitted.

  In this example, a power steering protector (protection mechanism) 170 includes two upper and lower rows of collars (cylinders) (protection members) 171, wires (cylindrical supports) 172 provided through the collars 171, and both ends of the wires 172. It consists of a pair of supporting members 173A, 173B to be held. The collar 171 is made of a metal (or resin) cylinder and preferably has an inner diameter of 11 mm or more. The wire 172 has a diameter of about 10 mm. In this way, a constant gap is formed between the collar 171 and the inside of the wire 172 so that the collar 171 can rotate on the wire 172 with respect to the traveling direction of the tractor 10.

  The support member 173A is formed of a metal plate, and one end is fitted to the right end portion of the piston rod 152. Specifically, a hexagonal fitting hole 173a1 is provided in the support member 173A. On the other hand, a male screw 152B is formed at the tip of the piston rod 152, and a pedestal 152A is provided adjacent to the male screw 152B. The pedestal portion 152A is formed in a hexagonal shape so that it can be fitted into the fitting hole 173a1 of the support member 173A. The thickness of the pedestal portion 152A is the same as the thickness of the support member 173A. A screw hole J1 that is screwed into the male screw 152B is formed at one end of the connecting portion J ′. Then, after the support member 173A is fitted into the piston rod 152, the male screw 152B is screwed into the screw hole J1, and the piston rod 152 is attached to the connecting portion J ′.

  The support member 173B is formed of a metal plate in the same manner as the support member 173A, and one end of the support member 173B is fitted to a pedestal formed on the tip of the left side of the piston rod 152 (projecting from the left end of the cylinder 51). The structure for attaching the support member 173B to the piston rod 152 is the same as the structure for attaching the support member 173A to the piston rod 152, and a description thereof will be omitted.

  Two round holes 173a2 are formed at the other end of the support member 173A (the end opposite to the fitting hole 173a1). The right end portion of the wire 172 is passed through the round hole 173a2. Further, the wire 172 is passed through the taper collar 176 and the compression spring (elastic member) 174 in this order, and then passed through the washer 175. Then, a stopper 172E is hung on the tip of the wire 172 formed in a loop shape so that the end of the wire 172 does not come off from the washer 175, and the wire 172 is hung on the washer 175.

  The taper collar 176 is made of a thin cylinder made of metal. The outer diameter of the front end portion of the cylindrical body is formed smaller than that of the rear end portion. Specifically, the outer diameter of the tip portion of the cylinder is formed smaller than the outer diameter of the round hole 173a2 of the support member 173A. On the other hand, the outer diameter of the rear end portion of the cylinder is formed larger than the outer diameter of the round hole 173a2 of the support member 173A. Therefore, a taper is formed on the side surface of the cylinder so that the taper collar 176 cannot pass through the round hole 173a2.

  One end of a compression spring (elastic member) 174 is brought into contact with the rear end portion of the taper collar 176. Therefore, the outer diameter of the rear end portion of the tapered collar 176 is configured to be equal to or larger than the outer diameter of the compression spring 174 (Note that an annular washer may be used instead of the tapered collar 176. The outer diameter of the annular washer is larger than the outer diameter of the round hole 173a2, and the inner diameter of the washer is equal to or larger than the inner diameter of the collar 171. In addition, the washer is compressed into the annular portion. The spring 174 is configured to come into contact).

  The repulsive force of the compression spring 174 is set to a value that does not cause the wire 172 to bend due to its weight when the collar 171 is attached to the wire 172. The compression spring 172 has a function of always applying tension to the wire 171 and a function of preventing the wire 172 from being broken by an impact of the obstacle when the obstacle comes into contact with the wire 172. Yes.

  In addition, since the structure of the edge part of the wire 172 in the supporting member 173B is the same structure as that of the supporting member 173A, description is abbreviate | omitted.

  When the tractor 10 including the power steering protector 170 configured as described above encounters an obstacle such as a tree branch while traveling, the two rows of collars 171 and 171 are located in front of the power steering mechanism ps. The power steering mechanism ps can be protected from obstacles. Moreover, since the compression spring 174 is provided at both ends of the wire 172, when a strong force is applied to the wire 172, the compression spring 174 contracts and the wire 172 bends. Thereby, the strong impact concerning the wire 172 can be relieved and possibility that the wire 172 will tear can be reduced.

  In this example, the collars 171 provided in the power steering protector 170 are arranged in two rows. However, the present invention is not limited to this, and three or more rows may be used. As the number of the columns of the colors 171 increases, even if one of the colors is broken, the other colors can protect the power steering mechanism ps.

  FIG. 8A shows another example of the present invention. In this example, instead of the above example, a color (cylinder) 271 is arranged in a row. Thereby, the configuration of the power steering protector 270 can be simplified (in this example, the outer diameter of the collar 271 may be larger than that of the collar 171). The mounting position is on the same horizontal plane as the piston rod 152. Then, the wire (cylindrical support) 272 is passed inside the collar 271 and both ends of the wire 272 are hooked on the support members 273A and 273B. Specifically, the front and rear ends of the wire 272 are passed through a washer in the same manner as described above with reference to FIG. Then, a stopper is hung on the tip of the wire 272 formed in a loop shape so that the end of the wire 272 does not come off from the washer, and the wire 272 is hung on the washer.

  The support members 273A and 273B are formed of a metal plate, and one end is fitted to the right end portion of the piston rod 152. Since the fitting structure of the support members 273A and 273B with the piston rod 152 and the mounting structure of the piston rod 152 and the connecting portion J ′ are the same as in the above example, the description thereof is omitted.

  On the other hand, a round hole is formed at the other end of the support members 273A and 273B. The tip of the wire 272 is hooked in this round hole.

  FIGS. 8B and 8C show still another example of the present invention. In this example, instead of the wire 272 of the above-described example, a tension spring (elastic member) 282 is hooked between the support members 283A and 283B. Round holes for latching both ends of the tension spring 282 are formed at the tip portions of the support members 283A and 283B. A plurality of cylindrical collars (cylinders) 281 are provided in series on the outer periphery of the tension spring 282 (the collar 281 is movable in the length direction of the tension spring 282 and rotates in the circumferential direction of the tension spring 282). Is free). Since the fitting structure of the support members 283A and 283B with the piston rod 152 and the mounting structure of the piston rod 152 and the connecting portion J ′ are the same as in the above example, the description thereof is omitted.

  Then, the tension spring 282 is passed through a plurality of short cylindrical collars 281 having an inner diameter slightly larger than the outer diameter of the tension spring 282. By configuring the power steering protector 280 as described above, when the obstacle comes into contact with the collar 281, the tension spring 282 is extended, and the impact from the obstacle can be reduced. If the tensile strength of the tension spring 282 is set higher, it is possible to withstand a stronger impact from an obstacle.

  Since the collar 281 has a short cylindrical shape, a gap is formed between the adjacent collars 281 corresponding to the extension of the tension spring 282. Further, when the tension spring 282 is extended, it is bent with a repulsive force, so that it is possible to avoid an obstacle from directly hitting the cylinder 51, the piston rod 152, or the like.

  Note that the power steering protector may be configured with only the tension spring 282. In this case, the tension spring 282 functions to protect the cylinder 51 and the piston rod 152 from obstacles.

  FIG. 8D shows still another example of the present invention. In this example, a protective rod (protective member) 371 was fixed to the support members 373A and 373B by welding instead of the collar in the above example.

  Support members 373A and 373B are formed of a metal plate, and one ends thereof are fitted to both end portions of piston rod 152, respectively. Since the fitting structure of the support members 373A and 373B with the piston rod 152 and the mounting structure of the piston rod 152 and the connecting portion J ′ are the same as in the above example, the description thereof is omitted.

  At both ends of the support members 373A and 373B, both end portions of the protection rod 371 are fixed by welding. In this example, unlike the above-described example, since the elastic member is not used, the protection rod 371 does not have flexibility. Therefore, it is necessary to strengthen the strength of the protective rod 371 so that it can withstand an impact from an obstacle.

  In all the examples described above, the front wheel 15 can be steered by the steering handle, and the front wheel 15 is provided with the power steering mechanism ps. However, the present invention is such that the rear wheel can be steered by the handle and the rear wheel has the power steering mechanism. It is applicable also to vehicles (for example, a forklift etc.) provided with.

  The present invention is not limited to self-propelled agricultural vehicles such as tractors, but is self-propelled construction vehicles such as backhoes and bulldozers, transport vehicles such as forklifts, and automobiles traveling on bad roads. Applicable to traveling vehicles.

10 Tractor (self-propelled vehicle)
14 Chassis (body frame)
14a Notch 14g Screw hole 14h Through hole 15 Front wheel (wheel)
15W Wheel 17 Front Axle 51 Cylinder 52,152 Piston Rod 52E Female Thread 53 Pipe 54 Nut 55 Connecting Rod 55E Male Thread 56 Steering Rod End 57 Arm 58 Rotating Case 60 Kingpin 71 Protective Rod (Protective Member)
71a Mounting plate (bracket)
71b Bolt 71c Round hole 71d Screw hole 71R Right end 152A Pedestal part 152B Male screw 170, 270, 280, 370 Power steering protector (protection mechanism)
171 271 281 Color (Cylinder) (Protective member)
172,272 wire (cylindrical support)
172E Stopper 173a1 Fitting hole 173a2 Round hole 173A, 173B, 273A, 273B, 283A, 283B, 373A, 373B Support member 174 Compression spring (elastic member)
175 Washer 176 Taper collar 282 Tension spring (elastic member)
371 Protection rod J, J 'connecting part J1 screw hole ps Power steering mechanism (hydraulic mechanism)

Claims (5)

In a self-propelled vehicle equipped with a hydraulic mechanism that changes the direction of the left and right wheels by operating the steering wheel,
A rod-shaped protection member is provided in front of the hydraulic mechanism and along the hydraulic mechanism,
The hydraulic mechanism has a piston rod connected to the left and right wheels and movable to the left and right,
A support member is provided at each end of the piston rod, and the support member supports the protection member,
The protective member is configured to be rotatable with respect to the support member via an elastic member.   The self-propelled vehicle according to claim 1, wherein a plurality of the protective members are provided in the vertical direction. The protective member is a cylinder,
Provide a wire supported at both ends by the support member via the elastic member,
The self-propelled vehicle according to claim 1 or 2, wherein the wire penetrates into the cylinder and rotatably supports the cylinder. The protective member is a cylinder,
The self-propelled vehicle according to claim 1 or 2, wherein both ends of the elastic member are supported by the support member, penetrate through the cylinder, and rotatably support the cylinder.   The self-propelled vehicle according to claim 3 or 4, wherein the protection member is composed of a plurality of cylinders, and the cylinders are arranged in series.

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