KR102169356B1 - Structure of cab tilting cylinder - Google Patents

Abstract

The present invention relates to a cab tilting cylinder structure of a vehicle, and more particularly, a cylinder base formed in the form of an empty pipe, a rod accommodated to be slid up and down inside the cylinder base, and sliding under the rod. It is mounted so as to be possible, and includes a rod end in contact with the inner circumferential surface of the cylinder base, and an oil pipe formed through the rod and rod end and through which oil flows, and the oil pipe is opened to allow oil to flow freely when the vehicle is running. In addition, when the vehicle cab is tilted up or down, the oil pipe is closed to prevent oil from flowing, and by applying a close contact structure between the rod end and the sleeve and the cylinder base, the cab tilting cylinder It relates to a cap tilting cylinder structure with improved operation failure.

Description

Structure of cab tilting cylinder {STRUCTURE OF CAB TILTING CYLINDER}

The present invention relates to a structure of a cab tilting cylinder of a vehicle, and more particularly, by removing an expansion section (Lost Motion section) from a cab tilting cylinder of a conventional truck and changing the structure of the rod and rod end, the sleeve is fitted to the gap of the cylinder base. It relates to a cap tilting cylinder structure that prevents sleeve damage caused by being caught.

In general, a cab tilting system for a truck is used to facilitate inspection and maintenance of various devices provided in the engine room by raising or lowering the cab, that is, the cab located at the top of the engine room of a large truck.

In addition, the cab tilting system for a truck is used to improve driver's ride comfort and driving safety by absorbing driving vibration and shock transmitted to the cab as much as possible while driving, and to reduce driver fatigue.

Such a cab tilting system uses a structure that rotates and tilts manually according to the standard of the truck, and a structure that is automatically tilted by an operating device operated according to the operation of a switch.In recent years, a simple button operation instead of a manual cab tilting system An electro-hydraulic cab tilting system that can raise and lower the cab and fix the cab is mainly used for convenience of the driver.

1 is a cross-sectional view showing the structure of a conventionally used cab tilting cylinder, FIG. 2A is a cross-sectional view showing a state in which the sleeve of the conventional cab tilting cylinder does not protrude when the vehicle is driven, and FIG. 2B is a cab tilting operation of the vehicle Is a cross-sectional view showing a state in which the sleeve of a conventional cab tilting cylinder protrudes under a normal flow rate, and FIG. 2C is a cross-sectional view showing a state in which the sleeve of the conventional cab tilting cylinder protrudes excessively in an excessive flow rate state during the cab tilting operation of the vehicle. .

As shown in Fig. 1, the conventional cap tilting cylinder 1 has an inner diameter that increases as it goes from the top to the bottom so that the end of the rod 2 and the cylinder base 3 do not come into contact with each other, and a gap is formed. It forms a section (aka Lost Motion section).

The reason for forming such an expansion section is that the upper and lower hydraulic pressures in the cab tilting cylinder 1 become the same when driving the vehicle, so that the rod 2 flows without resistance as the cab moves, thereby reducing harmful resistance transmitted to the cab. This is to improve the ride comfort.

2A, the sleeve 5 mounted on the outer circumferential surface of the rod 2 does not protrude when the vehicle is running, and the oil inside the cab tilting cylinder 1 is between the cylinder base 3 and the rod 2 It flows freely through the gap.

As shown in FIG. 2B, during a tilt-up or tilt-down operation of raising or lowering the cab of the vehicle, an O-ring is applied while hydraulic pressure is applied into the cab tilting cylinder 1. , 4) expands to apply pressure to the sleeve 5, so that the sleeve 5 protrudes so that the airtightness between the cylinder base 3 and the sleeve 5 is maintained.

That is, when the airtightness is maintained between the sleeve (5) and the cylinder base (3) during the tilt-up or tilt-down operation, when hydraulic pressure is applied in the upper or lower direction, the rod (2) rises or falls and the vehicle cab rises. Or it will go down.

However, as shown in FIG. 2C, in the conventional cap tilting cylinder 1, when the rod 2 moves excessively upward and downward, the sleeve 5 protrudes into the gap (gap) of the cylinder base 3 (5) is rapidly worn, and if such abrasion is repeated, the sleeve 5 is damaged and pressure formation in the cap tilting cylinder 1 becomes impossible, so that the tilt up and down of the cap becomes impossible.

In addition, as the sleeve 5 becomes impossible to tilt up and down due to damage to the sleeve 5, there is a risk of a safety accident in which the cab suddenly descends during vehicle maintenance by the driver, and the marketability of the vehicle is impaired.

The present invention was conceived to solve the problems of the prior art, and by removing the expansion section from the conventional cap tilting cylinder and applying a close contact structure between the rod end and the sleeve and the cylinder base, the operation of the cap tilting cylinder due to sleeve breakage. An object thereof is to provide a cap tilting cylinder structure with improved defects.

In addition, the present invention is to provide a cab tilting cylinder structure that significantly reduces the possibility of safety accidents by preventing accidental lowering of the cab by preventing damage to the sleeve of the cab tilting cylinder and improving the marketability of the vehicle. There is this.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems that are not mentioned will be clearly understood by those of ordinary skill in the art from the description of the present invention. .

The configuration of the present invention to achieve the above object, the cylinder base is formed in the form of a hollow pipe; A rod accommodated to be slidable up and down inside the cylinder base; A rod end mounted to be slidable under the rod and contacting the inner circumferential surface of the cylinder base; And an oil pipe formed through the rod and the rod end and through which oil flows. Including, when the vehicle is driven, the oil pipe is opened to allow oil to flow freely, and when the vehicle cab tilts up or down, the oil pipe is closed to prevent oil from flowing.

In addition, the cap tilting cylinder structure according to an embodiment of the present invention includes: a guide plate disposed at a lower end of the rod and slidably connected to the rod through a guide pin; It further comprises, the guide plate is preferably opened and closed the lower end of the oil pipe according to the oil pressure inside the cylinder base.

In addition, the cap tilting cylinder structure according to an embodiment of the present invention includes an annular stopper ring coupled to a lower portion of the rod and having a diameter relatively larger than the inner diameter of the rod end; And a seating portion formed at a lower end of the rod end and recessed so that the stopper ring is in close contact with the shape of the stopper ring. It further comprises, it is preferable that the downward movement of the rod end is restricted by the stopper ring.

Further, the cap tilting cylinder structure according to an embodiment of the present invention includes: a sleeve coupled to an outer peripheral surface of the rod end and always in close contact with the cylinder base to maintain airtightness between the rod end and the cylinder base; It is preferable to further include.

The present invention having the configuration as described above, by forming through the oil pipe through which the oil flows inside the rod and the rod end, vibration and noise transmitted to the cab during driving of the vehicle despite removing the expansion section of the conventional cab tilting cylinder It has the effect of reducing this.

In addition, the present invention includes a guide plate that is connected to the lower end of the rod through a guide pin and slides to close the lower end of the oil pipe, thereby expanding the sleeve by expanding the O-ring for a tilt-up or tilt-down operation in a conventional cap tilting cylinder. Unlike protruding, it is possible to facilitate the tilt-up and tilt-down operation of the cab simply by blocking the oil pipe, and it has the effect of remarkably reducing the tilt-up and tilt-down operation failure of the cab tilting cylinder due to damage to the sleeve.

In addition, according to the present invention, the sleeve is fixedly coupled to the outer circumferential surface of the rod end so that the sleeve is always in close contact with the cylinder base, thereby alleviating the sleeve abrasion problem occurring in the process of protruding the sleeve from the conventional cap tilting cylinder.

In conclusion, the cab tilting cylinder according to the present invention improves the structure of the cab tilting cylinder to significantly reduce tilt-up and tilt-down impossibility due to sleeve breakage, significantly lower the likelihood of safety accidents, and marketability of the vehicle. It has the effect of improving.

1 is a cross-sectional view showing a structure of a conventionally used cap tilting cylinder.
2A is a cross-sectional view showing a state in which a sleeve of a conventional cab tilting cylinder does not protrude when the vehicle is driven.
2B is a cross-sectional view showing a state in which a sleeve of a conventional cab tilting cylinder protrudes under a normal flow velocity during a cab tilting operation of a vehicle.
2C is a cross-sectional view showing a state in which a sleeve of a conventional cab tilting cylinder protrudes excessively in an excessive flow rate state during a cab tilting operation of a vehicle.
3 is a cross-sectional view showing an interior view of a cab tilting cylinder according to an embodiment of the present invention when the cab descends while the vehicle is running.
4 is a cross-sectional view showing an interior view of a cab tilting cylinder according to an embodiment of the present invention when the cab is raised while the vehicle is running.
5 is a cross-sectional view showing an interior view of a cab tilting cylinder according to an embodiment of the present invention during a cab tilting-up operation of a vehicle.
5 is a cross-sectional view showing an interior view of a cab tilting cylinder according to an embodiment of the present invention during a cab tilting down operation of a vehicle.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein.

In order to clearly describe the present invention, parts irrelevant to the description have been omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

In addition, terms or words used in the present specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventor appropriately defines the concept of terms in order to describe his own invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of the present invention based on the principle that it can be done.

3 is a cross-sectional view showing an interior view of the cab tilting cylinder according to an embodiment of the present invention when the cab is lowered while the vehicle is running, and FIG. 4 is A cross-sectional view showing the interior of the cab tilting cylinder, and FIG. 5 is a cross-sectional view showing the interior of the cab tilting cylinder according to an embodiment of the present invention when the vehicle cab tilts up, and FIG. 5 is a cab tilting down of the vehicle In operation, a cross-sectional view showing the interior of the cap tilting cylinder according to an embodiment of the present invention.

The cap tilting cylinder structure according to an embodiment of the present invention includes a cylinder base 10 formed in a pipe shape with an empty inside, a rod 20 accommodated in the cylinder base 10 so as to slide up and down, and the It is mounted to be slidable under the rod 20 and formed through the rod end 30 in contact with the inner circumferential surface of the cylinder base 10 and the rod 20 and the rod end 30, and the oil flows inside. It characterized in that it comprises an oil pipe (40).

The cylinder base 10 is generally formed in the form of a cylindrical pipe with an empty inside, but may be formed as a pipe having various cross-sections such as a square, a hexagon, and an oval according to a structural change of a cab tilting cylinder according to a type of vehicle.

A rod 20 having a diameter relatively smaller than the diameter of the cylinder base 10 is accommodated inside the cylinder base 10, and the upper end of the rod 20 is connected to the lower portion of the cap (not shown) to provide a cap It slides up and down according to the movement of

That is, the rod 20 moves up and down according to the vertical movement of the cab during driving of the vehicle, or tilts the cab vertically according to the oil pressure inside the cylinder base 10 during the cab tilting operation.

The rod 20 is also generally formed in a cylindrical shape like the cylinder base 10, but it will be understood that it is formed in various shapes corresponding to the shape of the cylinder base 10.

In the illustrated embodiment, the rod 20 has an upper diameter relatively larger than a lower diameter to form a locking projection 22, and the lower portion of the rod 20, that is, of the locking projection 22 The rod end 30 is mounted to be slidable in the lower part.

The locking protrusion 22 of the rod 20 serves to prevent the rod end 30 from rising excessively when the rod end 30 slides upward, and the rod end 30 according to the oil pressure when the vehicle cab tilts up. It serves to transmit the movement of the rod (20).

The rod end 30 is preferably in contact with the inner circumferential surface of the cylinder base 10 by having an outer diameter of the same or relatively small size as the inner diameter of the cylinder base 10, and the inner diameter of the rod end 30 is a rod (20) It is preferable that the rod end 30 is formed to be the same as the lower diameter or slightly larger than the lower diameter so that the rod end 30 can slide under the rod 20.

An annular stopper ring 24 having a relatively larger diameter than the inner diameter of the rod end 30 is coupled to the lower portion of the rod 20, and at the lower end of the rod end 30, the shape of the stopper ring 24 Correspondingly, the seating portion 32 is recessed so that the stopper ring 24 can be closely contacted.

The stopper ring 24 serves to prevent separation from the rod 20 when the rod end 30 slides downward, as opposed to the locking projection 22 of the rod 20 described above. It serves to transmit the movement of the rod end 30 according to the oil pressure to the rod 20 during the cab tilting down operation.

When the oil pipe 40 to be described later is closed, it is preferable that the stopper ring 24 and the seating portion 32 are completely in close contact to prevent oil from leaking, and more preferably, the stopper ring 24 is made of a rubber material. It is good.

It is preferable that the sleeve 34 is always in close contact with the cylinder base 10 on the outer circumferential surface of the rod end 30 to maintain airtightness between the rod end 30 and the cylinder base 10.

Unlike the conventional cab tilting cylinder (1 in FIG. 2b) in which the sleeve (5 in FIG. 2b) repeats protrusion and depression according to the operating state of the vehicle, the sleeve 34 according to the present invention has the outer peripheral surface of the rod end 30 It is fixedly coupled to.

The sleeve 34 may be partially formed on a part of the outer circumferential surface of the rod end 30 according to the airtight condition of the cap tilting cylinder, or may be formed to surround the entire outer circumferential surface of the rod end 30, but the rod end ( It would be desirable to be coupled to the outer peripheral surface of 30) in the form of a ring.

3 to 6, an oil pipe 40 is formed through the lower portion of the rod 20 and the upper portion of the rod end 30 so that oil can flow into the lower portion of the rod 20.

The oil pipe 40 is opened when the vehicle is running to allow oil to flow freely (shown in Figs. 3 and 4), and is closed when the vehicle cab is tilted up or down to prevent oil from flowing (Figs. 5 and 4). Shown in 6).

Specifically, the oil pipe 40 includes a vertical pipe 42 formed in the longitudinal direction of the rod 20 and two horizontal pipes 44 formed in the radial direction of the rod 20. Arranged in a'shape' shape, a'b'-shaped auxiliary pipe 46 is formed on the top of the rod end 30.

By forming the oil conduit 40 in the rod 20 and the rod end 30, the oil flows freely along the oil conduit 40 even without the expansion section formed in the conventional cap tilting cylinder (1 in FIG. 1), and the cap There is an effect of reducing vibration and noise transmitted to the device.

That is, the oil pipe 40 replaces the role of the conventional expansion section, and the rod end 30 can be formed in a structure in close contact with the cylinder base 10, thereby preventing the sleeve 34 from being damaged. Occurs.

The opening or closing of the oil pipe 40 may be operated electronically by sensing the oil pressure inside the cylinder base 10, but as will be described later, whether a mechanically operated residual failure occurs depending on the pressure of the oil, and reduces production cost. It would be more desirable in terms of it.

It is preferable that a guide plate 50 connected to the rod 20 so as to slide up and down through a guide pin 52 is installed at the lower end of the rod 20 to open and close the lower end of the oil pipe 40.

Specifically, the guide plate 50 closes the lower part of the oil pipe 40 when the cab (not shown) descends or the cab tilts up or down while the vehicle is running (shown in FIGS. 3, 5 and 6). , When the cab rises while the vehicle is running, the lower portion of the oil pipe 40 is opened (shown in FIG. 4).

The guide plate 50 is generally a disk formed sufficiently large to block the lower portion of the oil pipe 40, but may be variously formed in a form of a valve connected by a spring or a propeller according to an embodiment of the cap tilting cylinder. .

That is, the guide plate 50 may take any shape as long as it is a structure capable of opening and closing the lower end of the oil pipe 40, and the present invention will be described on the premise that it is in the form of a disk.

Specifically, the structure of the cab tilting cylinder according to the state of the vehicle is as follows.

As shown in FIG. 3, when the cab (not shown) descends while the vehicle is running, the rod 20 moves downward according to the movement of the cab, and the rod end 30 is relatively moved upward so that the rod 20 It is caught on the locking jaw 22 of.

As the rod 20 including the rod end 30 is moved in the downward direction of the cap as a whole, the oil inside the cylinder base 10 is moved upward, and the direction of the arrow in the embodiment shown through the oil pipe 40 Accordingly, it is transmitted to the upper portion of the cylinder base 10.

As shown in FIG. 4, when the cab is raised while the vehicle is running, the rod 20 is moved upward according to the movement of the cab, and the rod end 30 is relatively moved downward to be caught by the stopper ring 24. .

As the rod 20 including the rod end 30 is moved in the upward direction of the cap as a whole, the oil inside the cylinder base 10 moves downward, and the direction of the arrow in the embodiment shown through the oil pipe 40 Accordingly, it is transmitted to the upper portion of the cylinder base 10.

As shown in FIG. 5, when the vehicle cab is tilted up, oil is injected into the upper and lower portions of the cylinder base 10, thereby forming a strong oil pressure under the rod end 30 having a relatively large cross-sectional area.

As the oil pressure under the rod end 30 is greater than the oil pressure in the upper portion of the rod end 30, the rod end 30 moves upward and is caught by the locking projection 22 of the rod 20, and the guide plate ( 50) is also moved upward to block the lower end of the oil pipe 40.

As the oil pressure under the rod end 30 increases continuously while the oil pipe 40 is closed, the rod 20 including the rod end 30 is moved upward as a whole to tilt the vehicle cab. do.

As shown in FIG. 6, when the vehicle cab is tilted down, oil is injected into the upper portion of the cylinder base 10, and a strong oil pressure is formed in the upper portion of the rod end 30.

As the oil pressure on the upper portion of the rod end 30 increases, the rod end 30 is moved downward and is caught by the stopper ring 24, and guided by a reaction according to the movement of the rod end 30 and the rod 20 The plate 50 is moved upward to block the lower end of the oil pipe 40.

As the oil pressure above the rod end 30 increases continuously while the oil pipe 40 is closed, the rod 20 including the rod end 30 is moved downward as a whole to tilt down the vehicle cab. do.

At this time, a sealing compound (not shown) is applied to the outside of the guide plate 50 that blocks the oil pipe 40 so that when the guide plate 50 is in close contact with the rod 20, it is more firmly contacted. You can do it.

In the technical field to which the present invention pertains, the present invention described above is not limited by the above-described embodiments and the accompanying drawings, and that various substitutions, modifications and changes can be made within the scope of the technical spirit of the present invention. It will be obvious to those of ordinary skill.

10: cylinder base
20: load
22: locking jaw
24: stopper ring
30: rod end
32: seat
34: sleeve
40: oil pipe
42: vertical pipe
44: horizontal pipe
46: auxiliary pipeline
50: guide plate
52: guide pin

Claims (4)

A cylinder base formed in the form of an empty pipe, a rod accommodated in the cylinder base so as to be slid up and down, and a rod end slidably mounted under the rod and in contact with an inner circumferential surface of the cylinder base; And
An oil pipe formed through the rod and the rod end and through which oil flows; Including,
In the cap tilting cylinder structure in which the oil pipe is opened to allow oil to flow freely when the vehicle is running, and the oil pipe is closed to prevent oil from flowing when the vehicle cab tilts up or down ,
A guide plate disposed at the lower end of the rod and slidably connected to the rod through a guide pin; It further includes,
The guide plate is a cap tilting cylinder structure, characterized in that opening and closing the lower end of the oil pipe according to the oil pressure inside the cylinder base .
delete The method of claim 1,
An annular stopper ring coupled to a lower portion of the rod and having a diameter relatively larger than the inner diameter of the rod end; And
A seating portion formed at a lower end of the rod end and recessed so that the stopper ring can be in close contact with the shape of the stopper ring; It further includes,
Cap tilting cylinder structure, characterized in that the downward movement of the rod end is restricted by the stopper ring.
The method of claim 1,
A sleeve coupled to the outer circumferential surface of the rod end and always in close contact with the cylinder base to maintain airtightness between the rod end and the cylinder base; Cap tilting cylinder structure, characterized in that it further comprises.

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