KR100453277B1 - Lift for automobile maintenance - Google Patents

Abstract

Inside the support 10, the cylinder portion 12 of the hydraulic cylinder device serving as the driving member is assembled in a state in which the protrusion of the piston rod 13 is arranged upward, and the tip of the piston rod 13 is installed. It is provided in the upper end of the carriage 11, and it is possible to carry out a piston rod outwardly upward.

Inside the carriage 11 assembled freely up and down along the support in a state guided by the support, a cylinder guide member 14 for installing an insertion hole for inserting the cylinder portion 12 in the center is installed, and the carriage 11 According to the elevating movement of the can be moved along the outer circumference of the pipe of the cylinder portion (12).

As a result, the cylinder guide member of the cylinder device, which starts to bend in a '-' shape at the initial stage of buckling, contacts the inner circumferential surface of the carriage or the cylinder portion, thereby preventing buckling.

Description

LIFT FOR AUTOMOBILE MAINTENANCE}

The present invention is an improvement of a fuzhou vehicle fixed-cost lift having one stock or two or more pillars, and specifically, a piston rod in a cylinder device for lifting and lowering a carriage assembled freely along the support. The present invention relates to an improved vehicle maintenance lift for buckling prevention.

In a two-stock vehicle maintenance lift, which is one of the conventional vehicle maintenance lifts, an arm supporting the vehicle is provided in the carriage, and the carriage moves up and down along the standing posts to maintain the vehicle at an appropriate height. As a method of installing the cylinder device for moving the carriage up and down, as shown in Fig. 5, the other end of the wire or chain 5 having one end fixed to the carriage 11 is fixed to the support 10, and the other support 10 ), The wire or chain (5) between the cylinders) is held by a pulley (9) axially supported at the tip of the piston rod (13) of the cylinder device to enlarge the stroke of the cylinder. The support post 10, the cylinder portion 12 of the cylinder device which is arranged in the support 10, and the piston rod 13 in the upward and outward operation, and the support post in a state guided by the support post 10 A carriage 11 freely assembled up and down along 10), and an arm 11a of the vehicle supporting member installed at a lower portion of the carriage 11, and the upper portion of the carriage 11 being connected to the piston rod 13; The carriage 11 is directly lifted by the indentation operation of the piston rod 13 by supporting it at the tip of the There is a fixed cost lift that makes it possible to move strongly. This fixed-cost lift is provided under the carriage 11 to hold the arm 11a in the lower part of the vehicle, and the movement distance of the arm 11a of the upper limit position which raised the piston rod 13 to the maximum height is the maximum as a lift. It becomes stroke length h, and the height to the front-end | tip of the piston rod 13 becomes the maximum length L of a cylinder.

Since such a lift has a slight gap in the fitting portion between the cylinder portion and the piston rod in the cylinder apparatus, as shown by the dashed-dotted line in FIG. There is a possibility. The buckling load equation of Euler as follows is known about this buckling phenomenon.

Pk: Buckling Load

n: coefficient of terminal condition of column

E: Young's modulus of the material

I: Moment of Inertia

L: length of pillar

Establishment condition

λ: elongation ratio

k: second-order radius

N: Constant by material

The condition which causes the cylinder device to buckle from this oiler's buckling load equation is when the limit of the thin equipment is exceeded and the load limit is exceeded. Among these, the load limit is determined as the rated load of the lift, and the other three equipment is a factor. Specifically, the three devices become larger at the maximum lift as the cylinder device is the longest, and it is easy to cause buckling.

In order to prevent such buckling, a lift having a thick pipe diameter of the cylinder portion to strengthen the fixing force at the lower end thereof, or a lift fixing the upper end of the cylinder portion 12 to the support 10 through the clamp 16 as shown in FIG. 2. As shown in Fig. 3, there is a lift that inverts the cylinder portion 12, makes the piston rod 13 hollow, connects the oil supply hole with a pipe rod, and supplies hydraulic pressure.

However, the thickened pipe diameter of the cylinder lifts the cost of the cylinder, increases the cost of the pillars located outside, and increases the cost of hydraulic drives such as tanks by increasing the amount of oil. It becomes.

In addition, the lift fixing the upper end of the cylinder portion as shown in FIG. 7 has a great effect on buckling prevention, but the overall strength of the carriage 11 for forming the passage hole of the clamp 16 on the rear surface of the carriage 11 is insufficient. Therefore, it is necessary to reinforce the thickness of the carriage 11 to increase the weight of the carriage itself, thereby increasing the cost of increasing the hydraulic drive member.

In addition, as shown in FIG. 8, the lift having the cylinder portion 12 inverted has a small length because the maximum length (L) of the cylinder device is small, and buckling is less likely to occur. However, when the packing in the cylinder is aging, oil leakage occurs. Pipe is installed on the movable part of the carriage side, and the piping corresponding to the lifting and lowering movement must be performed, which makes oil processing more difficult, increases the cost, and generally lowers the marketability of the pipe rod used for the cylinder inverted type. Since it is very expensive, the cost of the whole lift will increase.

1 is a longitudinal sectional view showing the prop of a vehicle fixed cost lift of the present invention;

2 is a partially enlarged view of the vicinity of the cylinder guide member 14 in FIG.

3 is an explanatory view showing a cylinder guide member 14 of another shape;

4 is an explanatory view showing a cylinder guide member 14 of another shape;

5 is an explanatory diagram showing a conventional vehicle maintenance lift;

6 is an explanatory diagram showing a support post in another conventional vehicle maintenance lift;

7 is an explanatory diagram showing a support post in another conventional vehicle maintenance lift;

8 is an explanatory diagram showing a prop in another conventional vehicle maintenance lift.

※ Explanation of symbols for main parts of drawing

10: holding 10a: foundation

11: carriage 11a: arm

12: cylinder portion 13: piston rod

13a: piston 14: cylinder guide member

14a: inner edge member 14b: mounting member

14c: roller 15: oil supply hole,

16: guide roller 17: side shoe

Accordingly, the present invention, in view of the above problems, the invention according to claim 1 is an upright strut installed, a cylinder device arranged to move up and down the piston rod in the strut, and the elevating along the strut in the state guided by the strut A freely assembled carriage and a vehicle support member installed at a lower portion of the carriage, and by supporting the upper portion of the carriage at the tip of the piston rod, the carriage can be moved up and down directly in accordance with the piston rod's movement. In a vehicle maintenance lift, a cylinder guide member is provided on the outer circumferential surface of the cylinder portion or the inner circumference of the carriage in the cylinder device. As a result, the cylinder device which is likely to start to bend in a "shaped" shape at the initial stage of buckling can prevent the buckling by contacting the inner circumferential surface or the cylinder portion of the cylinder guide member installed in the cylinder portion or the carriage inner circumference. have.

For example, if the cylinder guide member is installed at a position that is 1/2 of the full length L at the longest cylinder where buckling is likely to occur, as shown in Equation 1, the denominator becomes 1/4 when L is 1/2. The buckling strength Pk is quadrupled.

As such, the theoretical buckling strength obtained by the oiler's buckling load equation is quadrupled by simply installing the cylinder guide member of the present invention, so that the cylinder pipe can be made thinner or longer while maintaining the same strength inversely. It can provide a compact, inexpensive, and excellent low cost lift.

The foundation to be installed here may be installed on the floor of the maintenance station, buried, or installed on a mobile platform with wheels so that the work place can be moved, or it can be omitted by installing the prop directly on the floor. .

The vehicle supporting member may be a member capable of supporting a vehicle to be maintained, and may include an arm that can support the lower surface of the vehicle body near the wheel and expand and contract with the vehicle body, a drive on plate that rides on the wheel, and the like.

The cylinder guide member is provided with a mounting plate portion on the outer circumference of the cylinder portion or on the inner circumference near the lower end of the carriage, and the lower end of the carriage which becomes the other side by fixing the cushioning material or the low friction sliding member to the groove formed at the tip of the mounting plate portion. It may be along the inner circumference of the vicinity or the outer circumference of the pipe of the cylinder portion. Thereby, the usage-amount of an expensive buffer material etc. can be reduced. The resin material suitable for this cylinder guide member should just be a material excellent in sliding property and abrasion resistance.

As another shape of the cylinder guide member, a roller may be provided around the outer periphery of the cylinder portion or in the vicinity of the lower end of the carriage, and may be rotated along the inner periphery near the lower end of the carriage or the pipe outer periphery of the cylinder portion. Moreover, it is preferable to form the circumferential surface of a wide roller so that it may match with the curved surface of a cylinder part.

In any of the above two examples, the cylinder guide member does not need to be continuously installed at the same size or circumferential length with respect to the inner circumference near the lower end of the carriage or the entire circumference of the outer circumference pipe of the cylinder portion, and can be provided in pieces at intervals. That is, it is suitable to install the cylinder guide member in pieces as in the invention according to claim 2.

EMBODIMENT OF THE INVENTION Hereinafter, an example of embodiment which actualized this invention is described in detail based on drawing.

1 is a longitudinal cross-sectional view showing the prop of a vehicle maintenance lift, showing a state in which the lift apparatus is stopped at an upper limit position. The struts 10 which are mounted on the base 10a of the floor are located on both sides of the vehicle to be maintained, and the carriages 11 are lifted and lifted by the carriage 11 while supporting the vehicle with the arms 11a of the carriage 11, respectively. Can be maintained.

The cylinder part 12 of the hydraulic cylinder device which becomes a drive member is assembled in the post 10, and the piston rod 13 is assembled with the protrusion part lined up upwards, and the front end of the piston rod 13 is a carriage. It is provided in the upper end of (11), and it is possible to carry out a piston rod outwardly upward.

The carriage 11 is assembled freely up and down in the state guided by the guide roller 16 and the side shoe 17, and the insertion hole for inserting the cylinder part 12 in the center inside the carriage 11 is carried out. The cylinder guide member 14 for drilling through is installed and can move along the pipe outer circumference of the cylinder part 12 between the lower limit and the upper limit of the lift according to the lifting and lowering of the carriage 11. The installation position of the cylinder guide member 14 is the inner peripheral surface of the lower end of a carriage, and is the inner peripheral surface of the outer cylinder shape which opposes the circumferential front surface of the cylinder part 12 in the upper limit position of a cylinder apparatus. The diameter of the insertion hole is preferably made small so that the lifting and lowering of the carriage 11 does not interfere with the outer circumference of the cylinder guide member 14 and the cylinder portion 12 in contact or non-contact.

FIG. 2 is a partially enlarged view of the vicinity of the cylinder guide member 14 in FIG. 1. The distance (S2) between the piston (13a) and the pipe inner diameter of the cylinder portion (12) is as small as possible to seal against oil leakage, while the distance between the piston rod (13) and the rod guide member (12a) S1 does not need to be narrowed like the conventional lift, and the piston rod 13 has a higher precision than the conventional one in terms of straightness, roundness, and surface roughness. There is no need to use rods, which reduces costs.

The oil supply hole 15 is provided in the bottom surface of the cylinder part 12, and the hydraulic oil sent from the hydraulic drive apparatus which is not shown in figure pushes up the piston 13a of the cylinder part 12 through the oil supply hole 15, and a piston The carriage 11 fixed at the upper end of the rod 13 and the arm 11a provided at the lower end thereof are raised to stop the ascent at the stroke end of the cylinder portion 12 to become the upper limit of the lift. To lower, open the lowering valve of the hydraulic drive and lower the hydraulic pressure. The hydraulic oil in the cylinder portion 12 is returned to the tank through the oil supply hole 15 as opposed to when the oil pressure hole 15 is raised. ) And the arm 11a go down.

3 is a view showing a cylinder guide member 14 of another shape. The cylinder guide member 14 of FIG. 2 is mounted on the carriage 11, whereas the cylinder guide member 14 of FIG. 3 is installed around the pipe outer circumference of the cylinder portion 12 and along the inside of the carriage moving up and down. To do that. And the cylinder guide member 14 is an inner edge member 14a which consists of a cushioning material, such as resin which slides along the inside of the carriage 11, or a low friction sliding material, and the groove | channel which removes the inner edge member 14a freely. It is composed of a mounting member (14b) fixed to the outer periphery of the cylinder portion 12 is installed on the peripheral edge. As a result, only the worn inner edge member 14a can be replaced, thereby reducing the amount of expensive cushioning material or the like. In addition, the cylinder guide member 14 is installed not only on the inner circumference of the carriage 11, but also on the inner circumference of the carriage 11, or on the inner circumference of the carriage 11. It is also possible to install only the edge member 14a in pieces.

4 is a view showing the cylinder guide member 14 of another shape, (b) is a cross-sectional view of (a). The cylinder guide member 14 is comprised from the installation member 14b fixed to the inside of the carriage 11, and the roller 14c rotatably provided in the installation member 14b. As a result, the cylinder guide member 14 can be moved up and down while directly contacting the cylinder portion 12 without a gap, so that there is no fear of buckling, and high and low lift movement is possible. As shown, the worn roller 14b can be replaced, and the thickness of the cylinder part 12 is made thick and there is no weight increase or cost increase. In addition, the roller 14c has a cylindrical shape having an arc-shaped surface along the outer circumferential surface of the cylinder portion 12, and the contact speed decreases as compared with the cylindrical roller, and the wear rate is also delayed, thereby reducing the frequency of exchange. have.

In addition, this invention is not limited to the said embodiment.

As described above, according to the invention of claim 1, the cylinder guide member is provided on the outer circumferential surface of the cylinder portion or the inner circumferential surface of the carriage in the cylinder device, so that the buckling strength at the full length of the cylinder is higher than that of the conventional lift. Almost four times, the safety is improved, while the cylinder device always receives vertical load and never receives unbalanced load from the horizontal direction, so the sliding resistance between the cylinder part and the piston or piston rod does not increase, resulting in increased lifting efficiency. Since the progress of wear is also suppressed, the durability is improved, and the appearance precision of the piston rod can be reduced as compared with the prior art, thus eliminating the need for expensive machine rods. In addition, the cylinder guide member can be provided to reduce the diameter of the cylinder portion and the piston rod compared to the conventional one while maintaining the buckling strength. Therefore, the weight of the cylinder and the size of the hydraulic drive device for driving it can be reduced, and the whole lift can be made smaller. Since the cylinder stroke can be lengthened, it is possible to provide a low-cost vehicle lift that does not require a mechanism for expanding the cylinder stroke by using a moving car and a chain.

Next, according to the invention of claim 2, in addition to the effect of claim 1, by providing the cylinder guide member in pieces, it is possible to provide a vehicle fixed cost lift in which the amount of the guide member is reduced and the cost is reduced.

Claims (2)

With the props which stood up, A cylinder device disposed in the support such that the piston rod is raised and raised upward; A carriage freely assembled and lifted along the support in the state guided by the support; In a vehicle fixed cost lift including a vehicle support member provided at a lower portion of the carriage, and by supporting the upper portion of the carriage at the tip of the piston rod, the carriage can be directly lifted and lowered by the movement of the piston rod. , A vehicle maintenance lift, characterized in that a cylinder guide member is provided on an outer circumferential surface of a cylinder or an inner circumferential surface of a carriage in the cylinder device. The method of claim 1, A fixed cost lift for a vehicle, characterized in that the cylinder guide member is partially installed.