JP2012136318A - Portable-type simplified jack for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable-type simplified jack for a vehicle which has wheels at a body and can freely change a position.SOLUTION: The body 1 comprises: an oil tank 15 for accommodating a working fluid; a hydraulic cylinder 4 having a plunger 12 which protrudes in order to lift up the vehicle; a booster 11 which operates the hydraulic cylinder 4 by the reciprocative movement of an embedded piston 18; a regulator 14 for adjusting air pressure; and a valve 13 for switching a flow of air. The plunger 12 of the hydraulic cylinder 4 is protruded by the operation of the booster 11.

Description

  The present invention relates to a mobile simplified jack for a vehicle that includes a hydraulic cylinder and is configured to output a very large force.

  When servicing a vehicle or changing tires, the vehicle must be lifted, and a jack is used to lift the vehicle. Here, there are various types of jacks, but basically a structure having a hydraulic cylinder is overwhelming. That is, the vehicle can be pushed up or lifted by protruding the piston lot (plunger) of the hydraulic cylinder. The large jack is a permanent type and can push up the entire vehicle at once, and the small jack moves to a predetermined place and pushes up a part of the vehicle. Therefore, a moving wheel is attached to the small jack.

  By the way, these hydraulic jacks use a pump to introduce hydraulic oil into a hydraulic cylinder, and the hydraulic oil causes the piston (plunger) to protrude and push up the vehicle, but the plunger stopped at a predetermined height Fixed in position. Then, when the maintenance of the vehicle is completed, if the switching valve is switched by operating the lever, the vehicle in which the plunger is contracted and pushed down is lowered.

  If it is a permanent large jack, it is possible to use the solenoid valve as a switching valve for flowing hydraulic oil in and out, and a pump for feeding the hydraulic oil to a hydraulic cylinder is operated by a motor. You can also However, a movable small jack cannot be equipped with a hydraulic pump and motor for operating a hydraulic cylinder, and is generally configured to operate the hydraulic pump using air pressure.

  A “movable simple jack” according to Japanese Patent Application Laid-Open No. 2004-307093 is provided with a plunger that slides a hydraulic cylinder on a main body with wheels mounted on both sides, and the plunger protrudes by applying hydraulic pressure. And it is a simple type jack that can be moved to any place by the handle operation of the lever extending from the main body, so that the plunger can be lifted by hitting the jack up point on the bottom of the vehicle body even at night I have to. That is, a lamp that illuminates the upper side is attached to the upper surface of the main body, and the lamp is turned on by the battery of the box attached to the lever so that the jack-up point can be understood.

This simple mobile jack is designed to be able to jack up even at night, but its basic structure is movable with wheels on both sides of the main body, and a lever extends from the main body. Has a handle. The main body may be provided with a hydraulic cylinder, and the plunger may protrude by operating the hydraulic cylinder, or the cradle may be raised via the link mechanism.
"Mobile simple jack" according to Japanese Patent Application Laid-Open No. 2004-307093

  The above-mentioned mobile simple type jack causes the plunger of the hydraulic cylinder to protrude by air pressure, but this air can be guided from the outside, or the air pump is operated by operating the handle, and this air is used to make the hydraulic cylinder Supply hydraulic oil to The present invention provides a mobile simple type vehicle jack capable of generating a heavy load by operating an air pump (booster) using an external air pressure and operating a hydraulic cylinder with the booster.

  The mobile simple type vehicle jack according to the present invention includes a wheel on a main body, a handle is extended from the main body, and the handle can be moved by grasping the handle. The handle is attached to the rear part of the main body so as to swing up and down. By the way, the main body is equipped with a hydraulic cylinder, an oil tank, a booster, etc., and the booster is operated by air supplied from outside, and the plunger (ram) of the hydraulic cylinder is expanded and contracted by the hydraulic oil sent from the booster. Can move.

  Here, the booster has a piston, and the piston moves forward by air supplied from the outside, and moves backward by a predetermined distance. That is, air flows out from the outlet provided on the inner surface of the cylinder, and the air supplied from the outside by opening the slide valve flows out from the exhaust port. The piston moves backward by the spring force of the built-in coil spring. When the piston is retracted, the outlet is closed, the slide valve is also closed, and the air from the outside acts on the piston again to advance.

  The booster piston repeats moving forward and backward with air supplied from outside. Then, a thin plunger extends from the piston, and the hydraulic oil in the oil tank can be supplied to the hydraulic cylinder by the forward / backward movement of the thin plunger, and the plunger of the hydraulic cylinder can be moved up and down.

  The mobile simple type vehicle jack of the present invention operates a booster with air supplied from the outside, and the booster operates a hydraulic cylinder to move a plunger of the hydraulic cylinder up and down. That is, when the plunger moves forward and backward together with the piston provided in the booster, the hydraulic oil in the oil tank can be guided to the hydraulic cylinder and the plunger can move up and down, but the plunger is very large. Force can be output.

  That is, the plunger outer diameter extending from the piston is smaller than the piston outer diameter of the booster, so that a large hydraulic pressure is generated in the hydraulic oil by the pressing force of the thin plunger, and this large hydraulic pressure is generated by the plunger of the hydraulic cylinder. By acting on, the output of the plunger becomes very large. Therefore, although the jack of the present invention is a mobile simple type, its ability to be output is very high.

In the Example which shows the jack for mobile simple vehicles which concerns on this invention, the top view and the front view are represented. The air and hydraulic circuit which comprise the jack of this invention. A specific example of a booster that operates a hydraulic cylinder. The longitudinal cross-sectional view of a hydraulic cylinder.

  1A and 1B are schematic views of a mobile simplified vehicle jack according to the present invention, wherein FIG. 1A is a plan view and FIG. 1B is a front view. In the figure, 1 is a main body, 2 is a wheel, 3 is a handle, 4 is a hydraulic cylinder, and wheels 2 and 2 are rotatably attached to both sides of the main body 1. You can move to any location. The handle 3 can be connected to a swing shaft 10 provided at the rear portion of the main body 1 so that the jack can be easily moved and swung in the vertical direction.

  A ring-shaped grip 5 is attached to the front end of the handle, and a lever 6 is provided in the middle of the handle 3. By operating the lever 6, the tilt of the handle 3 can be changed. Therefore, if the lever 6 is not operated, the handle 3 is fixed at a predetermined inclination angle, and the jack body 1 can be moved with the grip portion 5 at the tip.

  Here, the operation of the lever 6 for changing the inclination angle of the handle 3 is not limited, but in the case of the embodiment shown in the figure, the connecting rod 7 is moved by swinging the lever 6 back and forth along the handle 3. When the lever 3 is released from the hole 8 provided in the handle fixing member 9 of the main body 1 and the handle 3 swings and the lever 6 is released, the tip of the connecting rod 7 is fitted into the hole 8 and fixed. . A handle fixing member 9 is attached to the outer periphery of the swing shaft of the handle 3 in the main body 1, and a plurality of holes into which the tip of the connecting rod 7 fits on the outer periphery of the handle fixing member 9 concentric with the swing shaft 10. 8, 8... Are provided.

By the way, the jack of the present invention supplies air from the outside, operates the booster 11 by this air, and the booster 11 can move the plunger 12 of the hydraulic cylinder 4 up and down. FIG. 2 shows an air and hydraulic circuit constituting the jack of the present invention. According to the figure, air from the outside passes through the valve 13 and enters the regulator 14, and the air pressure is increased by the regulator 14. Generally, air pressure external of about 14kg / cm ² or so, the air pressure is reduced to about ^8kg / cm ^{2 ~10kg} / cm 2 at the regulator.

  The decompressed air is guided to the booster 11, and the booster 11 sucks up the hydraulic oil from the oil tank 15 and sends it out to the hydraulic cylinder 4. Accordingly, the plunger 12 of the hydraulic cylinder 4 can protrude, and the heavy vehicle can be pushed up by the protrusion of the plunger 12. Further, air is supplied to the oil tank 15 in front of the regulator 14 to apply air pressure. As a result, the hydraulic oil in the oil tank 15 can be easily sent out to the hydraulic cylinder 4.

  Then, when the valve 13 is switched, air pressure acts on the hydraulic cylinder 4, and if the booster 11 stops and stops sending out the hydraulic oil, the protruding plunger is lowered by the air pressure. Incidentally, the air and hydraulic circuit shown in FIG. 2 is configured in the main body 1, and the regulator 14, booster 11, hydraulic cylinder 4, and oil tank 15 are attached to the main body 1. The handle 3 can swing in the vertical direction, but can also rotate about the handle shaft. That is, if the direction of the grip 5 is changed, the plunger 12 of the hydraulic cylinder 4 is lowered.

  3 is an embodiment showing the internal structure of the booster. If the valve 13 is opened, the air that has passed through the regulator 14 enters the inlet 16 and flows into the cylinder space 17 from the inlet 16. Then, the piston 18 accommodated in the cylinder space 17 is pressed, and the piston 18 slides forward (leftward). In this case, a coil spring 19 is built in front of the piston 18, and the coil spring 19 is compressed by the advance of the piston 18. Therefore, the spring force pushed back by the coil spring 19 is biased to the piston 18.

  A thin plunger 20 extends from the piston 18, and the plunger 20 moves forward as the piston 18 moves forward. An air outlet 22 is provided on the inner periphery of the cylinder 21. When the piston 18 slides and advances to a predetermined position, the air flowing into the cylinder space 17 flows out from the outlet 22. The air flows into a space 24 formed at the rear of the slide valve 23 provided at the central shaft portion at the rear of the cylinder, and presses the rear end of the slide valve 23. As a result, the slide valve 23 moves forward and a gap 25 communicating with the cylinder space 17 is formed.

  Accordingly, the air in the cylinder space flows through the gap 25 and flows out from the exhaust port 26 penetrating the cylinder 21, and the piston 18 is pushed back by the spring force of the coil spring 19. The piston 18 hits the tip of the slide valve 23 to retract the slide valve 23. As a result, the slide valve 23 closes the gap 25, and the air in the cylinder space 17 cannot flow out from the exhaust port 26. Then, the air that flows in from the inlet 16 and enters the cylinder space 17 presses the piston 18, and the piston 18 slides forward again.

  As described above, the air continuously flowing in from the inlet 16 causes the piston 18 to repeat the forward / backward movement, and at the same time, the thin plunger 20 extending forward from the piston 18 can also repeat the forward / backward movement. . Therefore, if the plunger 20 moves forward, hydraulic oil can be sent out to the hydraulic cylinder 4, and the plunger 12 of the hydraulic cylinder 4 protrudes.

  That is, the hydraulic oil filled in the space 27 passes through the gap with the ball 28, and pushes down the ball 29 to flow through the oil passage 30 and is sent to the hydraulic cylinder 4. Conversely, if the plunger 20 moves backward, the hydraulic oil is sucked up from the oil tank 15. That is, when the plunger 20 moves backward, the space 27 becomes negative pressure, the ball 28 rises, and the working oil flows from the oil passage 31 connecting the oil tank 15. However, the ball 29 is lifted and closed so that the hydraulic oil from the oil passage 30 connecting the hydraulic cylinders 4 does not flow backward.

  Here, the spring force of the coil spring 32 accommodated in the space 27 is always urged to the ball 28 so that the ball 28 can float only when the plunger 20 is retracted, and the ball 29 is provided below the coil spring. The spring force of 33 is always urged to prevent the backflow of hydraulic oil from the hydraulic cylinder side when the plunger 20 moves backward. The ball 29 is pushed down only when the hydraulic oil is sent from the space 27 to the hydraulic cylinder 4 side by the advancement of the plunger 20.

  A switching valve 34 and a relief valve 35 are provided between the oil passage 30 and the oil tank 15, and when a pressure higher than a certain level acts on the hydraulic cylinder 4, the oil tank 15 is connected via the relief valve 35. It is made to flow to. Further, when the plunger 12 of the raised hydraulic cylinder 4 is lowered, if the handle 3 is rotated, the switching valve 34 is operated and the hydraulic oil in the hydraulic cylinder is returned to the oil tank 15.

  FIG. 4 is a specific example showing a longitudinal section of the hydraulic cylinder 4. The hydraulic cylinder 4 is mounted upright on the front end side of the main body 1, and the vehicle can be pushed up by the plunger 12 protruding. By the way, the plunger 12 has a structure in which a lower bearing 36 serving as a guide is integrated at the lower end thereof. An O-ring 38 and a backup ring 39 are fitted in a groove 37 formed in the middle portion of the lower bearing 36.

  A surface layer 40 having low wear resistance and low sliding friction is integrally formed on the surface of the lower bearing 36. The plunger 12 is made of aluminum bronze, so that it has excellent tensile strength, high hardness, and excellent corrosion resistance. One upper bearing 41 is attached after the plunger 12 is fitted to the hydraulic cylinder 4, and is screwed. An O-ring is fitted in a groove formed on the inner peripheral surface of the upper bearing 41, and an O-ring is fitted in a groove formed on the outer periphery to prevent oil leakage. An attachment 42 is attached to the upper end of the plunger so as to be replaceable.

  An oil passage 43 is provided at the lower end of the hydraulic cylinder 4 and is continuous with the oil passage 30 connected to the booster 11. Furthermore, an air port 44 is provided on the upper side of the hydraulic cylinder 4, and air can be supplied from the air port 44 in order to smoothly lower the protruding plunger 12. That is, by switching the valve 13, the air sent to the booster 11 is guided to the air port 44.

DESCRIPTION OF SYMBOLS 1 Main body 2 Wheel 3 Handle 4 Hydraulic cylinder 5 Grip part 6 Lever 7 Connecting rod 8 Hole 9 Handle fixing member
10 Oscillating shaft
11 Booster
12 Plunger
13 Valve
14 Regulator
15 Oil tank
16 entrance
17 Cylinder space
18 piston
19 Coil spring
20 Plunger
21 cylinders
22 Outlet
23 Slide valve
24 spaces
25 Clearance
26 Exhaust vent
27 space
28 balls
29 balls
30 Oilway
31 Oilway
32 Coil spring
33 Coil spring
34 Switching valve
35 relief valve
36 Bottom bearing
37 groove
38 O-ring
39 Backup ring
40 Surface layer
41 Upper bearing
42 Attachment
43 Oilway
44 Air port

Claims (2)

In a mobile simple vehicle jack that has wheels on the main body and can change the location freely, the main body has an oil tank that contains hydraulic oil, and a hydraulic cylinder that has a plunger that protrudes to push up the vehicle A booster that operates a hydraulic cylinder by a reciprocating motion of a built-in piston, a regulator that adjusts air pressure, and a valve that switches the flow of air. Built-in slide valve that pushes and slides backward to close the exhaust port when retreating, and the piston moves forward with the air flowing into the cylinder space of the booster and is provided on the cylinder inner surface when it reaches a predetermined position The air flowing out from the outlet pushes the rear end of the slide valve so that the cylinder space and the exhaust are exhausted. A narrow plunger that extends from the piston moves forward and backward with the piston to suck up the hydraulic oil in the oil tank and to project the plunger of the hydraulic cylinder. A mobile simplified vehicle jack. The mobile simple type vehicle jack according to claim 1, wherein a lower bearing is integrally provided at a lower end portion of the plunger of the hydraulic cylinder, and a surface layer having excellent wear resistance is formed on a surface of the lower bearing.

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