JP2927124B2 - Power steering device for industrial vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power steering apparatus for an industrial vehicle, and more particularly to a power steering apparatus in which the diameter of a piston rod is reduced and the strength of a portion connected to a tie rod is increased.

[0002]

2. Description of the Related Art A conventional power steering apparatus using a double rod cylinder is disclosed in, for example, Japanese Utility Model Laid-Open No. 1-1618.
No. 76 is disclosed. Such a power steering device is configured as follows. That is, a power cylinder composed of both rod cylinders having piston rods projecting from both sides is used, and the piston rod of the power cylinder is rotatably pin-connected to one end of a tie rod. The other end of the tie rod is rotatably pin-connected to a knuckle arm forming a part of a knuckle spindle, and a steering rotation portion of the knuckle spindle is rotatably connected to an axle support member by a king pin. . The cylinder tube of the power cylinder is fixed to the axle support member in parallel with a line connecting the centers of the left and right king pins.

[0003] Here, a bush is mounted on the pin joint between the piston rod and the tie rod in order to reduce rotational resistance and increase durability.

[0004]

Since the role of the power cylinder is to rotate the knuckle spindle about the kingpin axis through the piston rod and the tie rod, the power cylinder is used especially in a low-speed running or stopped state such as a forklift. Industrial vehicles with high steering frequency require sufficient cylinder thrust.

Therefore, in order to increase the cylinder thrust, it is necessary to increase the inner diameter of the power cylinder as much as possible, reduce the outer diameter of the piston rod (hereinafter referred to as rod diameter) as much as possible, and increase the hydraulic pressure receiving area. Or, it is necessary to increase the allowable operating pressure. However, in order to increase the allowable operating pressure, it is necessary to increase the pressure resistance of the piping system, and the scale increases, the cost increases, and a large space is required. In addition, the engine vehicle must have a sufficient engine torque margin, and the battery vehicle must have a sufficient pump motor torque margin, thereby increasing the size of the engine and the motor.

Therefore, it is necessary to increase the pressure receiving area of the hydraulic pressure. However, if the inner diameter of the power cylinder is increased, the outer diameter of the power cylinder is also increased, so that a large mounting space is required and the cost is increased. On the other hand, when the rod diameter is reduced in order to increase the pressure receiving area, it is impossible to increase the outer diameter of the ring portion for pin connection with the tie rod for the following reasons. That is, the power cylinder includes a cylinder tube, a piston rod having a piston fixed at an intermediate portion, and a disk-shaped end cover having a hole at a central portion through which the piston rod can be inserted. Here, a male screw is threaded at an end of the cylinder tube, and a female screw is threaded at one end cover, and the female screw is
It can be screwed with the male screw.

[0007] These are individually manufactured and assembled as follows. First, the piston rod is inserted into the cylinder tube, and is pushed until the piston fixed to the piston rod is located at a substantially intermediate portion of the cylinder tube. Then, the end of the piston rod is inserted into the hole at the center of the end cover, the end cover is moved until it reaches the end of the cylinder tube, and then the end cover is screwed into the cylinder tube. The power cylinder is assembled by performing the same operation on the other end of the piston rod.

If the outer diameter of the ring portion at the end of the piston rod is larger than the inner diameter of the cylinder tube,
The piston rod cannot be inserted into the cylinder tube during the assembly operation. For the above reasons, in both rod cylinders, it was impossible to increase the outer diameter of the end ring while reducing the rod diameter. Therefore,
When the rod diameter is reduced, the ring portion at the end becomes smaller and the hole diameter also becomes smaller, so that the size of the coupling pin and the bush also becomes smaller, and there is a disadvantage that it is difficult to secure the strength of these.

Further, when the diameter of the hole for the pin connection is reduced, the surface pressure on the inner surface of the hole is increased, so that the bush is increased in wear and the durability is reduced. And
When the diameter of the hole for pin connection is increased while the rod diameter is reduced, the thickness of the pin connection portion is reduced, and the strength of the connection portion is reduced. Furthermore, when it is difficult to secure the accuracy such as the fixed position of the power cylinder, the connecting position of the knuckle spindle, or the parallelism of the two king pins, the spherical bush whose outer diameter is larger than the straight bush because the hole diameter for pin connection is small. Cannot be used, and it is difficult to absorb errors.

The present invention has been made to eliminate the above-mentioned drawbacks of the prior art, and an object of the present invention is to reduce a hole diameter for pin connection even with a small rod diameter for increasing the pressure receiving area. An object of the present invention is to increase the size of the connecting pin and the bush so as to increase the size of the connecting pin and the bush, and to sufficiently secure the strength thereof. Also, by increasing the hole diameter for pin connection, the surface pressure on the inner surface of the hole is reduced,
It is another object of the present invention to reduce the wear of the bush at the end ring portion and increase the durability of the bush.

Further, by making the outer diameter of the end ring portion larger than the rod diameter, it is possible to increase the wall thickness of the hole end even if the hole diameter for pin connection is increased. Another object is to increase the strength of the end of the hole. And
By increasing the hole diameter for pin connection, the spherical bush can be used, and the cylinder fixing position,
It is another object of the present invention to absorb an error such as a connection position of a knuckle arm or a parallelism between both king pins.

According to a first aspect of the present invention, the power cylinder comprises a double rod cylinder, and the piston rod of the power cylinder is connected to one end of a tie rod by a pin, and the other end of the tie rod is connected to a knuckle arm by a pin. A knuckle spindle integral with the knuckle arm is rotatably coupled to the axle support member by a kingpin,
The cylinder tube of the power cylinder may be a power steering device fixed to an axle support member, wherein the piston rod is connected to a rod portion that enters and exits the cylinder tube, and the rod is provided at one end and the other end of the rod.
And a connecting support having a ring portion formed with an outer diameter larger than the outer diameter of the portion and having a hole for connecting the tie rod, wherein the connecting support has a connection length. Adjustment means
Characterized in that it is detachably connected to the rod portion through the slab .

The invention according to claim 2 is characterized in that the tie lock
Grease is applied to the inner peripheral surface of the hole of the connecting
So that the source leaks out,
A grease reservoir is provided at an upper portion and a lower portion .

[0014]

According to the first aspect of the present invention, the power cylinder is assembled as follows. That is, the rod part is inserted into the cylinder tube, and the piston fixed at the center of the rod part is pushed in until it is located at substantially the middle part of the cylinder tube. Then, the end of the rod is inserted into the hole at the center of the end cover, the end cover is moved until it reaches the end of the cylinder tube, and the end cover is fixed to the cylinder tube. The same operation is performed on the opposite end of the cylinder tube. Thereafter, the connecting support is connected to one end of the rod portion, and the connecting support is similarly connected to the other end, thereby completing the power cylinder.

Here, the rod portion and the connecting support are separate parts, and after the end cover is connected to the cylinder tube, the connecting support is connected to the rod portion. Can be selected independently of the rod diameter. Therefore, reduce the rod diameter to the minimum size while ensuring strength.
Even with a small power cylinder
A necessary and sufficient hydraulic pressure receiving area can be secured. Also,
The ring part of the connecting support is also larger than the outer diameter of the rod part.
Large diameter for pin connection
However, since the bushing can be made necessary and sufficient, a bushing can be freely selected according to a load condition or a durability condition, and a spherical bushing having a large outer diameter can be mounted regardless of the rod diameter. Further, since the connecting support is detachably connected, the disassembly with the cylinder tube is easy, and the maintenance performance is not deteriorated.

Further , the connecting length of the connecting support is adjusted.
It is possible, by adjusting its length, the該連contact for support, the spacing of the pin junction of the right and left, can be set to a desired spacing. Then, the direction of the knuckle arm is adjusted via the tie rod, and the toe angle of the steering tire supported on the knuckle spindle can be adjusted.

Further, the power steering apparatus according to claim 2 is provided.
The pin connection with the tie rod
To prevent grease from leaking into the inner peripheral surface of the
Grease at the top and bottom inside the hole of the connecting support
Grease accumulated in the grease reservoir because a reservoir is provided
Prevents dust from entering the pin joint. Their to, by injecting grease into regular grease reservoir, extruding grease containing dust to the outside, can be interchanged to clean grease.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings. FIG. 1 is a partially cutaway perspective view of the embodiment. First, an axle support member 1 is constituted by an upper plate 2 and a lower plate 3 and vertical plates 4 and 5 fixed between them. A cylinder tube 7 of a power cylinder 6 is fixed to the axle support member 1. I have. The axle support member 1 is supported by the vehicle body via pins 8, 8 fixed to the central portions of the vertical plates 4, 5, and the axle support member 1 can swing around the pins 8, 8 with respect to the vehicle body. I have. The power cylinder 6 is composed of both rod cylinders, and includes a cylinder tube 7, an end cover 10, and a piston rod 11. The cylinder tube 7 is fixed to the rear portion of the vertical plate 4 of the axle support member 1 with a clamp and a bolt (not shown), and is positioned parallel to a line connecting the centers of the left and right king pins 12. Also,
A hole for inserting the piston rod 11 is provided at the center of the end cover 10, and a gap between the hole and the piston rod 11 is kept liquid-tight by a seal member (not shown). A piston (not shown) is fixed to an intermediate portion of the piston rod 11, and the piston rod 11 is moved in both the left and right directions by a hydraulic pressure flowing from a hydraulic valve (not shown). .

Further, the piston rod 11 is
3 and the connecting support 14 are connected to each other,
FIG. 2 shows a state in which the piston rod 11 is formed by screwing the rod portion 13 and the connecting support 14 together. The rod portion 13 is a straight cylindrical rod-shaped member having a minimum rod diameter required to support the cylinder thrust and having no distortion. At both ends, screws 15 are provided in the longitudinal direction. The male screw 15 is connected to a connecting support 14 described later.
The screw fitting lengths of the connecting supports 14 at both ends are parallel so that the contact surfaces with the tie rods 18 are parallel in the same direction when tightened and connected to the female screw 17 of the rod-shaped portion 16. Set it. By doing so, the expansion and contraction movement of the piston rod 11 can be accurately transmitted to the tie rod 18.

The connecting support 14 comprises a bar 16 and a ring 20. The rod-like portion 16 has a columnar shape, and a female screw 17 is threaded in the longitudinal direction.
As described above, the female screw 17 can be screw-coupled to the male screw 15. Further, the outer diameter of the rod portion 16 is not larger than the outer diameter of the rod portion 13, and when one end of the rod portion 13 is retracted too much into the cylinder tube 7, the connecting end of the rod portion 16 is closed. The part prevents the end cover 10 from colliding.

The ring portion 20 is formed of the female screw 1 of the rod portion 16.
7 is formed at the end opposite to the end. The ring part 20
Has a circular shape whose outer diameter is larger than the rod diameter. The upper surface and the lower surface of the ring portion 20 are both flat, so that friction when the tie rod 18 is pin-connected is reduced. Further, the thickness of the ring portion 20 is sufficiently large that the friction with the coupling pin does not increase and the durability does not decrease. The center of the ring 20 is provided with a hole 2 for connecting the pin to the tie rod 18.
1 is provided. The diameter of the hole 21 can use a coupling pin or a bush having a sufficient strength, and a spherical bush that absorbs an error such as the parallelism of the king pin can be used if necessary. . In order to secure the strength of the ring portion 20, a certain thickness in the radial direction is required. Therefore, the thickness of the ring portion 20 is not reduced, and the strength of the ring portion 20 is not reduced.

The piston rod 11 thus configured has an outer diameter larger than the outer diameter of the rod portion 13.
It is possible to minimize the rod diameter while having the ring portion 20 in which the diameter of the hole 21 is increased , so that the pressure receiving area of the hydraulic pressure in the power cylinder 6 can be increased. Further, when the connecting support 14 and the rod portion 13 are integrally fixed by welding or the like, the two rod cylinders cannot be disassembled and the maintenance performance deteriorates. Cylinder 14
Can be detached from the rod portion 13 so that it can be easily disassembled.

In this embodiment, as the connecting means between the connecting support 14 and the rod portion 13, the connecting support 14 side is a female screw and the rod portion 13 is a male screw. However, the present invention is not limited to this. Instead, the connecting support 14 side may be a male thread and the rod part 13 side may be a female thread. The connecting support 14 is rotatably connected to one end of the tie rod 18, and the other end of the tie rod 18 is rotatably connected to the knuckle arm 22. FIG. 3 shows a longitudinal section of the tie rod 18 connected to the connecting support 14 and the knuckle arm 22. Hereinafter, the structure of the connection between the connecting support 14 and the tie rod 18 will be described with reference to FIG. 3. However, the structure of the connection between the knuckle arm 22 and the tie rod 18 is the same as that described above. All are given common symbols.

The tie rod 18 is constructed by vertically using plate members 23 and 24 having holes at both ends. On the other hand, the hole 21 of the ring portion 20 of the connecting support 14
Is formed with a small-diameter portion 25 toward the lower side. Then, the bush 26 is inserted from the opening on the upper surface of the hole 21,
The lower surface of the bush 26 is brought into contact with the end of the small diameter portion 25,
The upper surface of the bush 26 is locked by fitting a wedge-shaped member 27 into a groove formed from the upper surface of the hole 21.
Furthermore, by making the hole diameter of the bush 26 smaller than the diameter of the hole 21, the hole 21 of the connecting support 14 is
A step is provided with the hole 6 and grease reservoirs 28 are provided above and below the step.

In order to rotatably connect the connecting support 14 and the tie rod 18, a bolt 29 and a nut 30 are used, and the shaft of the bolt 29 functions as a pin. Here, a spherical bush 31 is engaged with an intermediate portion of the bolt 29. A grease injection hole 32 is provided inside the bolt 29, and the grease injection hole 32 is
The grease nipple 33 provided on the head of the sphere communicates with a hole formed in the contact surface with the spherical bush 31.

After the connecting support 14 and the tie rod 18 are connected in such a configuration, grease is injected from the grease nipple 33. Then, the grease leaks from the grease nipple 33 through the grease injection hole 32 to the contact surface with the spherical bush 31, and accumulates in the grease reservoir 28 provided above and below the bush 26. Thus, the accumulated grease prevents dust from entering. In addition, grease containing dust is pushed out by periodically injecting grease at the time of periodic inspection or the like, and clean grease is accumulated. Further, since the grease prevents dust from entering, it is possible to use an inexpensive spherical bush without a seal. Thus, by providing the grease reservoir 28, the hole 2
1. The effect of reducing the wear of the bolt 29, the bush 26, and the spherical bush 31 and increasing the durability is further enhanced.

Next, the knuckle spindle 34 supports the steered wheels, and includes a vertical cylinder 35, a spindle 36, and the knuckle arm 22. Here, the vertical cylinder 35
Is provided with a hole through which the kingpin 12 can be inserted along the central axis. The length of the vertical cylinder 35 is the same as the distance between the upper plate 2 and the lower plate 3 of the axle support member 1. I have. The knuckle spindle 3 is located at both ends of the axle support member 1 at a position between the upper plate 2 and the lower plate 3.
Then, the axle support member 1 and the knuckle spindle 34 are rotatably connected to each other by the king pin 12 and a nut (not shown).

In the power steering apparatus configured as described above, hydraulic pressure is applied to the piston fixed to the piston rod 11, and the piston rod 11 extends in the direction in which the hydraulic pressure is applied. This movement is transmitted to the knuckle arm 22 via the tie rod 18,
The knuckle spindle 34 rotates around the axis of the king pin 12. As a result, the direction of the spindle 36 changes, and the steering wheel (not shown) supported on a plane perpendicular to the spindle 36.
Changes direction.

Next, an embodiment in which the rod portion 13 and the connecting support 14 are connected via a coupling length adjusting means will be described with reference to FIGS. The shape and structure of the rod portion 13 and the connecting support 14 are the same as those of the embodiment of FIG. 2 except for the shape and structure of the connecting portion between them, and in the embodiments of FIGS. This has the same effect as the embodiment of FIG.

In FIG. 4, the connecting support 14 and the rod 1 are shown.
3 has been tightened by split tightening. In the figure, a male screw 15 is provided at an end of the rod-shaped portion 16 of the connecting support 14, while an end of the rod 13 is provided at the end of the rod 13.
A hole is provided in the longitudinal direction, and a female screw 17 having a fitting length sufficient to be screwed with the screw 15 is provided at the back of the hole. Further, the entrance end of the hole has a reduced thickness, and the thin portion is vertically divided into two divided grooves 37. Then, the outer periphery of the thin portion is covered with a splitting jig 38, and the protruding tightening portion is tightened with a bolt and a nut, so that the rod-shaped portion 16 and the rod portion 13 of the connecting support 14 are integrally tightened. I do.

In this case, the rod-like portion 16 of the connecting support 14 is
The length from the end of the rod portion 13 to the center of the hole 21 is adjusted by loosening or tightening the male screw 15, and then the screwing length is adjusted by tightening with the jig for split fastening 38. it can. By doing so, it is possible to adjust the toe angle, and to prevent early wear of the tire or deterioration of the traveling steering performance.

In FIG. 5, the connecting support 14 and the rod 1
3 is tightened by the nut 40 and the lock nut 41. In the figure, a male screw 15 is provided at the end of the rod-shaped portion 16 of the connecting support 14, while a hole is provided in the end of the rod portion 13 in the longitudinal direction, and a female screw is provided at the back of the hole. 17 are provided. In addition, the female screw 17
Has a thin wall, a screw 39 is screwed around the outer periphery of the thin portion, and the male screw 39 is provided with a split groove 37 in the longitudinal direction. Then, the male screw 15 is screwed into the female screw 17, and the male screw 39 is tightened by the nut 40 and the lock nut 41, thereby integrally tightening the connecting support 14 and the rod portion 13.

In this case, the length from the end of the rod portion 13 to the center of the hole 21 is adjusted by loosening or tightening the male screw 15, and then the nut 40 and the lock nut 4 are adjusted.
The screwing length can be adjusted by tightening with 1.
Thereby, the same effect as that of the embodiment of FIG. 4 can be obtained. FIG. 6 shows a state in which a caulking groove 42 is provided at the root of the external thread 39 of the rod portion 13 in the embodiment shown in FIG. By doing so, the screwing length of the lock nut 41 can be made longer than in the embodiment shown in FIG. 5, and the bending strength can be improved.

FIG. 7 shows a state in which the connecting support 14 and the rod 13 are connected by the wiring 43. In the figure, the end of the rod 13 has a hole 4 in the longitudinal direction.
7 is provided, and the rod 16 of the connecting support 14 is
7 can be inserted. The end of the rod portion 13 has a small thickness, and an inner peripheral groove 44a is formed in the inner periphery of the thin portion, and a hole is tangentially opened until the inner peripheral groove 44a is continued. A mounting hole 45 is provided. On the other hand, an outer peripheral groove 44b is formed in the outer periphery of the rod-shaped portion 16 of the connecting support 14, and the inner peripheral groove 44a and the outer peripheral groove 44b are combined to form a circular groove having a circular cross section. . Here, a plurality of outer peripheral grooves 44b of the rod-shaped portion 16 are formed so that the fitting length can be adjusted and the toe angle can be adjusted. Then, one of the plurality of outer circumferential grooves 44b having an appropriate fitting length is selected, and the wiring 43 is fitted through the wiring fitting hole 45. Thus, the wiring 43 is connected to the inner peripheral groove 44a and the outer peripheral groove 44b.
By connecting the rod portion 13 and the connecting support 14 to each other, a hole 21 is formed from the end of the rod portion 13.
Can be combined to a desired length. According to the present embodiment, the coupling space can be reduced by the dimension width of the nut 40 and the lock nut 41 compared with the embodiment shown in FIG.
Is effective when the distance between the end of the cylinder tube 7 and the bolt 29 is short at the time of contraction.

According to the above-described embodiment, since the connecting support 14 provided with the ring portion 20 and the rod portion 13 are separate parts, the machining of the rod portion 13 is simplified, for example, only by screwing. This eliminates the necessity for a part having a large weight and size, which requires accuracy, such as the distance between pins, which affects toe angle accuracy. This allows
Large parts are processed as simple as possible, and precision processing is concentrated on small parts to facilitate the process of piston rod 11 processing, reduce the cost of piston rod 11 and reduce the cost of power cylinder 6 as a whole. Can be planned.

Next, FIG. 8 shows a case where the rod portion 13 has a male thread on the side of the rod portion 13 as in the embodiment shown in FIG. (1) is a case where a slit is provided along the diameter,
(2) shows an embodiment in which a hexagonal concave portion is provided. When connecting the connecting support 14 to the rod portion 13, it is difficult to fix the connecting support 14 around the axis because the rod portion 13 has a cylindrical shape, and the work of screwing the connecting support 14 into the rod portion 13 is performed. Becomes difficult. Therefore, it is common practice to provide a two-plane width parallel to the side surface of the rod portion 13 as a detent means. However, when there is not enough space for providing the two-face width, or when it is desired to make the screwing length as long as possible, the method for providing the two-face width is not suitable. Therefore, instead of providing two widths, a rounded concave portion 46 is provided on the end face of the rod portion 13 so that the screwing length can be sufficiently secured. That is, a rounding jig having a convex portion that can be fitted into the concave portion 46 is fitted into the concave portion 46 at one end of the rod portion 13 and fixed so that the rod portion 13 does not rotate. Then, after attaching the connecting support 14 to the other end, the stop jig is removed. Thus,
The work of screwing the connecting support 14 into the rod portion 13 can be easily performed.

The recess 46 on the end face of the rod 13 is
If provided on both sides, either the left or right side can be connected to the connecting support 14 first. Further, a concave portion 46 is provided only on one side, the rod portion 13 is fixed by a stop jig, one end of the side on which the concave portion 46 is not provided and the connecting support 14 are first connected, and then the other end is provided. And connecting support 14
May be combined.

[0038]

According to the present invention, as described above, the cylinder tube
The piston rod is composed of the rod part that enters and exits the probe.
Make sure that the connecting support is larger than the outside diameter of the rod.
The structure has a ring part with a diameter dimension to increase the pressure receiving area.
Even if the rod is set to a small outer diameter to
Hole diameter of the ring part for fitting
As well as connecting pins and bushes
Can be increased in size, so that there is an effect that these strengths can be sufficiently secured. In addition, by increasing the diameter of the hole for pin connection, the surface pressure on the inner surface of the hole is reduced, the friction of the bush of the hole is reduced, and the effect of increasing the durability is also achieved. In addition, the connecting support
Coupling length adjustment means so that the length with the pad can be adjusted.
By connecting to the rod portion through the intermediary of the rod, there is an effect that the toe angle can be adjusted and the early wear of the tire or the decrease in the traveling steering performance can be prevented.

By increasing the hole diameter for pin connection, a spherical bush can be used, and there is an effect that errors in the fixed position of the cylinder, the connecting position of the knuckle arm, or the parallelism between the two king pins can be absorbed. In addition, by connecting the connecting support to the end of the piston rod so that the fitting length can be adjusted, the toe angle can be adjusted and early wear of the tire or deterioration of the traveling steering performance can be prevented. This has the effect.

[0040] Further, said connection for pin connection with a tie rod
To prevent grease from leaking into the inner peripheral surface of the
By providing grease reservoirs on the upper and lower inside of the hole of the connecting support, the wear resistance of the bush is improved without installing a dust seal as a dustproof measure,
There is an effect that cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an overall view showing one embodiment of the present invention.

FIG. 2 is a view showing a state in which the piston rod is configured by screwing a rod portion and a connecting support to each other;
(A) is a front view, (b) is a plan view, and (c) is a side view.

FIG. 3 is a longitudinal sectional view of a tie rod connected to a connecting support and a knuckle arm.

FIG. 4 is a plan view showing a state in which the connecting support and the rod are tightened by split tightening.

FIGS. 5A and 5B are diagrams showing a state in which the connecting support and the rod portion are tightened by a nut and a lock nut, wherein FIG. 5A is a plan view and FIG. 5B is a side view.

6 is a plan view showing a state in which a caulking groove is provided at a root portion of a split screw of a rod portion in the embodiment shown in FIG. 4;

FIG. 7 is a plan view showing a state in which the connecting support and the rod portion are connected by wiring.

FIG. 8 shows an end surface of a rod portion having a thread formed at an end portion,
It is a figure which shows the state in which the round recess was provided, (a) is the front view, (b) is the side view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Axle support member 6 Power cylinder 7 Cylinder tube 11 Piston rod 12 King pin 13 Rod part 14 Connection support 18 Tie rod 22 Knuckle arm 28 Grease reservoir 34 Knuckle spindle

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B62D 5/18 B62D 7/16-7/18

Claims (2)

(57) [Claims] 1. A power cylinder comprising two rod cylinders, a tie rod having one end connected to a piston rod of the power cylinder, a knuckle arm having a pin connected to the other end of the tie rod, and an integral part of the knuckle arm. An axle support member to which a knuckle spindle is rotatably connected by a kingpin and to which a cylinder tube of the power cylinder is fixed, wherein the piston rod has a rod portion which moves in and out of the cylinder tube; Outside diameter larger than the outside diameter of the rod part at the other end
And a connecting member having a ring portion formed with a hole and provided with a hole for connecting the tie rod .
The support is attached to and detached from the rod via the coupling length adjustment means.
A power steering device for an industrial vehicle, wherein the power steering device is combined with a power steering device. 2. The connection for pin connection with the tie rod.
To prevent grease from leaking into the inner peripheral surface of the
2. The power steering apparatus for an industrial vehicle according to claim 1, wherein grease reservoirs are provided at upper and lower portions inside the hole of the connecting support .