JPH0630624Y2 - Suspension device with built-in roller arm - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a tracked vehicle and the like, which incorporates a wheel arm built-in oil that absorbs and attenuates disturbance vibrations of the wheel that is mounted on the vehicle body via the wheel arm. The present invention relates to a pneumatic suspension device, and particularly to an air bleeding mechanism thereof.

(Prior Art) An overall external view of a hydraulic suspension system with a built-in roller arm is shown in FIG. 9, and an internal structure of the conventional device is shown in FIGS. 6 to 8.

In these figures, a roller 1 holding a crawler belt 12 is rotatably supported by a shaft 13 provided on a roller arm 2. A spline shaft 9 is fixed to a wheel bracket 7 mounted and fixed to a vehicle body 10 of a tracked vehicle or the like, and the wheel arm 2 is pivotally supported by the spline shaft 9. That is, the roller arm 2 can rotate about the spline shaft 9 via the bearing 14 fitted to the spline shaft 9 fixed to the vehicle body 10.

A piston cylinder 3 and an accumulator 4 are arranged in the wheel arm 2. A piston 6 is slidably arranged in the piston cylinder 3, and a movable partition 28 is slidably arranged in the accumulator 4. Cylinder end plate 15 having a flow path 29 and accumulator end plate 1 having a flow path 32
A valve block 5 is fixed in close contact with the valve block 6, and the valve block 5 is formed with a flow path for communicating the cylinder 3 with the accumulator 4. One end of a piston rod 11 is connected to the piston 6, and the piston rod 1
The other end of 1 is pivotally attached to a piston rod arm 8 fixed to a spline shaft 9. Therefore, the rolling wheel 1 is swingable with respect to the vehicle body 10 within the movable range of the piston 6.

The vertical vibration of the roller 1 is transmitted to the piston 6 from the piston rod 11 pivotally attached to the piston rod arm 8 fixed to the spline shaft 9 by the rotation of the roller arm 2 around the spline shaft 9. The piston 6 is reciprocated. This piston movement is communicated with the hydraulic oil A in the cylinder 3, the hydraulic oil A in the accumulator 4 communicating with the flow passage in the valve block 5, and the nitrogen in the accumulator 4 via the movable partition 28. The nitrogen gas is transmitted to the gas B, and the nitrogen gas is compressed and expanded to absorb and damp vertical vibrations of the wheel 1.

In the setting of the hydraulic suspension system with a built-in roller arm, the removal of the air mixed when the hydraulic oil A is supplied is
As shown in FIG. 8, the valve block 5 of the valve block 5 is lifted up from the horizontal 26 as shown in FIG. 7 (preferably at the maximum contraction side stroke roller center position 38 in FIG. 7). Oil is supplied while applying pressure from the oil supply hole 23 communicating with the flow path, the cylinder end plate 15 is passed through the valve block 5, the flow path 29 and the air bleed hole 31 are used to remove the air.
Air was evacuated from the air reservoir C to 7.

The nitrogen gas is sealed in the accumulator 4 by using the accumulator charge valve 27. Also, 1
9 and 20 are O-rings.

(Problems to be solved by the invention) I The following is a description of a hydraulic suspension system with a built-in wheel arm without air bleeding (when the air bleed hole 31 and the air bleed plug 17 are not provided in FIG. 8). There is a problem.

(1) As shown in FIG. 7 or FIG. 8, when setting, an air reservoir C is always generated between the side wall of the piston cylinder 3 and the cylinder end plate 15, and depending on the setting procedure, the accumulator 4 side may be formed. Similarly, air is trapped between the accumulator side wall and the accumulator end plate 16.

(2) This air acts as a pseudo accumulator and disturbs the designed suspension spring characteristics, making it difficult to obtain proper suspension characteristics.

(3) Further, this air mixes in the hydraulic oil A to cause a cavitation phenomenon, which leads to corrosion of component equipment.

(4) Further, the reciprocating motion of the piston 6 and the movable partition 28 compresses the air to promote heat generation, and the piston seal 3
It adversely affects the seal of 3, 34, etc.

II The conventional air bleeding structure as described above has the following problems.

In the conventional air bleeding, as shown in FIG. 8, a structure for guiding the air from the air reservoir C to the air bleeding plug 17 through the flow path 29 of the piston cylinder end plate 15 or the positively bleeding hole 31 is provided. The structure was adopted. However, the structure in which the air vent hole is provided in the end plate 15 as described above is as follows.
There is a problem from the point.

(1) Since the O-ring 19 is provided to seal the end plate 15 and the cylindrical side wall of the piston cylinder 3, the air vent hole 31 cannot be brought close to the apex 30 of the air chamber which becomes the air reservoir C (see FIG. 8). ).

(2) Since the end plate 15 is attached to the wheel assembly 2 by screwing or snap ring, it is difficult to set the air vent hole 31 to a predetermined position on the top side, and the air vent passage with the valve block 5 is not provided. Connection is not easy in terms of positioning and sealing.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a roller arm built-in type hydraulic / pneumatic suspension device having an air vent hole that eliminates the above-mentioned problems.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a rolling wheel arm swingably attached to a vehicle body, a piston cylinder incorporated in the rolling wheel arm, and a piston cylinder. In a hydraulic-air suspension system with a built-in roller arm that has a piston and hydraulic oil that is housed to suppress the swinging of the roller arm, a radial air vent hole is formed in the ceiling cylinder wall near the cylinder end plate of the piston cylinder. Is provided, and the air vent hole can be communicated with the outside through an air vent plug. Further, the piston cylinder is positioned in the circumferential direction with respect to the roller arm by the positioning member, and the relative position between the two is defined.

(Operation) In the hydraulic suspension system with a built-in roller arm of the present invention,
When the wheel arm is lifted during setting, the air vent hole is located at the highest position in the internal space of the piston cylinder. Therefore, when the air vent plug is opened in this state and the piston cylinder is filled with hydraulic oil, the air mixed in the hydraulic oil passes through the air vent hole and is discharged to the outside of the air vent plug.

When the piston cylinder is assembled in the roller arm, the relative position of the two is positioned by the positioning member, so the position of the air vent hole provided in the piston cylinder is necessarily the top side of the piston cylinder.

(Embodiment) An embodiment of a hydraulic-air suspension system with a built-in roller arm according to the present invention will be described below with reference to the drawings.

1 to 5, 1 is a rolling wheel, 2 is a rolling arm, 3 is a piston cylinder, 4 is an accumulator, 5 is a valve block, 6 is a piston, 7 is a rolling bracket,
8 is a rod arm, 9 is a spline shaft, 10 is a vehicle body, 1
Reference numeral 1 is a piston rod, 12 is a crawler belt, 13 is an arm shaft, 14 is a needle bearing, 15 is a cylinder end plate, 16 is an accumulator end plate, 27 is an accumulator charge valve, and 28 is a movable partition wall, except for the part related to air bleeding. It is substantially similar to the conventional structure.

Reference numeral 18-1 is an air vent hole, which is used for the piston cylinder 3
It is provided so as to penetrate in the radial direction in the ceiling side cylinder wall (cylindrical side wall) close to the cylinder end plate 15. Reference numeral 18-2 denotes an in-arm eccentric processed groove, which is formed on the inner wall of the roller arm 2 so as to communicate with the air vent hole 18-1. 18
-3 is an air vent passage in the arm, which is an eccentric processing groove 18-
An air vent plug 17 is provided at the end of the air vent passage 18-3. This air vent plug 17 has an air vent plug notch (chamber) 35 as shown in FIG.
have. This action will be described later. Reference numerals 19 and 21 are O-rings, and 20 is a plug, and the plug 20 closes an extra opening formed during processing of the air vent passage 18-3. Reference numeral 22 denotes a dust prevention plug which can be screwed into an air vent opening 18-4 formed in the valve block 5 so as to communicate with the in-arm air vent passage 18-3. Reference numeral 23 denotes a check valve-equipped oil supply port, which communicates with the cylinder 3 and the accumulator 4 via a flow path in the valve block. 24 is a cylinder positioning plug, 25 is a cylinder positioning plug groove formed on the outer circumference of the cylinder,
The cylinder positioning plug 24 functions as a positioning member that defines the relative positional relationship between the wheel assembly 2 and the cylinder 3, and can be screwed onto the wheel assembly arm 2.

29 is a cylinder end plate flow path, 32 is an accumulator end plate flow path, 33 is a piston seal on the piston cylinder side, 34
Is a piston seal on the accumulator side. 36 is O
The ring 37 is a screw for tightening the end plate. The O-ring 36 seals the cylinder 3 side and the arm 2 side of the air bleed passage.

The air vent hole 18-1 provided in the piston cylinder 3 is positioned on the top side by the positioning pin 24 and the groove 25 of the piston cylinder 3 shown in FIGS. The air in the air reservoir C passes through the air vent hole 18-1 and is guided to the eccentric processing groove 18-2 provided so as to be in contact with the spigot portion of the piston cylinder 3 of the rolling wheel arm 2, and the rolling wheel arm 2
It is guided to the air vent plug 17 through the air vent passage 18-3 provided in the.

The air bleeding plug 17 has a function of closing the flow path 18-3 by pressing a ball, and has a notch 35 in which a threaded portion of the plug is partially cut as shown in FIG. Therefore, the plug 17 is loosened so that the operating oil containing air is notched 35
Can be pulled through. The plug 20 is a block that closes the processing holes of these air vent passages, and the dust prevention plug 22 protects the air vent passage and the air vent plug 17.

Further, the cylinder 3 is mounted on the rolling wheel arm 2 by screwing the screw portion 37 of the end plate 15 into the rolling wheel arm 2, and is sealed by the O-ring 19. Further, the joint portion that forms the flow path 29 between the valve block 5 and the cylinder end plate 15 is sealed by the O-ring 21.

It should be noted that the in-arm eccentricity processed groove 18-2 forming a part of the air bleed passage is formed into a half moon shape as shown in FIG. 3 so that the air bleed hole 18-1 in the cylinder and the in-arm air bleed passage 18-3 are formed. Is easily adjusted.

The setting including the filling operation of the hydraulic oil A and the nitrogen gas B is performed by the following procedure.

Before mounting the suspension device on the vehicle 10, the hydraulic oil A is singly supplied from the oil supply port 23 of the valve block 5, the charge valve 27 of the accumulator 4 is opened, and the movable partition 28 is charged by the hydraulic pressure to the charge valve side. To the bottom of the movable partition 28 to fill the working oil with the accumulator end plate 16.

Next, the wheel arm 2 so that the valve block 5 is directly above.
Then, the air mixed in the accumulator 4 is extracted to the piston cylinder 3 side through the flow passage 32 of the accumulator end plate 16 and the flow passage in the valve block. The dust prevention plug 22 is removed, the air bleeding plug 17 is further opened, and the roller arm 2 is slowly set to the maximum contraction side stroke state as shown in FIG. 7, and mounted on the vehicle body 10 in this state. Next, in this state, the oil C is supplied by applying the oil pressure from the oil supply port 23 to completely remove the air C. After confirming that the air has stopped mixing from the air vent plug 17, the air vent plug 17 is completely tightened and the dust prevention bolt 22 is tightened.

Next, the wheel arm 2 is slowly lowered from the state shown in FIG. 7 to the state shown in FIG. 1 in the standard posture. At this time, the movable partition 28 of the accumulator is smoothly moved to the end plate 16 side.
Gas pressure may be applied from the charge valve 27. In the state in which the roller arm 2 is set to the standard state of FIG. 1,
Nitrogen gas B from the charge valve 27 to the accumulator 4
Is filled with the specified charge pressure, and the setting of the suspension system is completed.

(Effects of the Invention) As described above, the present invention provides a rolling wheel arm swingably attached to a vehicle body, a piston cylinder incorporated in the rolling wheel arm, and the rolling wheel arm housed in the piston cylinder. In the hydraulic suspension system with a built-in roller wheel arm having a piston for suppressing the swing of the piston and hydraulic oil, the piston cylinder is positioned in the circumferential direction with respect to the roller wheel arm by a positioning member. By providing an air vent hole in the radial direction on the ceiling side cylinder wall close to the end plate and allowing the air vent hole to communicate with the outside world via the air vent plug, the following effects are obtained.

(1) It is possible to prevent the cavitation phenomenon, the heat generation phenomenon, and the pseudo accumulator phenomenon due to the mixing of air in the piston cylinder, which can prevent the corrosion and prolong the life of the seal.

(2) Both the hydraulic oil amount and the accumulator charge pressure can be set as designed, and proper suspension characteristics can be obtained.

(3) The positioning member allows the piston cylinder to be positioned in the circumferential direction with respect to the roller arm, which makes it easy to assemble the piston cylinder into the roller arm.

[Brief description of drawings]

FIG. 1 is an embodiment of the hydraulic suspension system with a built-in roller arm of the present invention, which is a vertical sectional view in a standard posture, and FIG.
FIG. 3 is an enlarged cross-sectional view of the main part of the drawing, FIG. 3 is a cross-sectional view of the air vent hole portion of FIG. 2, FIG. 4 is a cross-sectional view of the cylinder positioning plug portion of FIG. 1, and FIG. FIG. 6 is an enlarged view, FIG. 6 is a vertical sectional view of a conventional hydraulic suspension system with a built-in roller arm in a standard posture, FIG. 7 is a vertical sectional view in a maximum contraction side stroke state, and FIG. FIG. 9 is an explanatory view of the state, and FIG. 9 is a schematic view of the entire hydraulic pressure suspension device with a built-in roller arm. 1 ... Roller wheel, 2 ... Roller arm, 3 ... Piston cylinder, 4 ... Accumulator, 17 ... Air bleed plug,
18-1 ... Air vent hole, 22 ... Dust prevention plug,
24 …… Cylinder positioning plug, 25 …… Cylinder positioning plug groove.

Claims (2)

[Scope of utility model registration request] 1. A rolling wheel arm swingably mounted on a vehicle body, a piston cylinder incorporated in the rolling wheel arm, a piston housed in the piston cylinder, and a hydraulic fluid for suppressing the swinging of the rolling wheel arm. In the hydraulic-air suspension system with a built-in roller arm, the piston cylinder is circumferentially positioned with respect to the roller arm by a positioning member, and a radius is provided on a ceiling-side cylinder wall near the cylinder end plate of the piston cylinder. 1. An air-pressure suspension device with a built-in roller arm, characterized in that an air vent hole in the direction is provided, and the air vent hole can communicate with the outside world via an air vent plug. 2. An oil pressure suspension system with a built-in rolling wheel arm according to claim 1, wherein an air bleeding passage communicating with the air bleeding hole is provided in the rolling wheel arm, and the air bleeding plug is arranged at an end of the passage. apparatus.