JPH0650474Y2 - Vehicle maintenance lifter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a lifter used to lift a vehicle when inspecting and servicing the vehicle.

(Prior Art) There are various types of lifters, but basically, an elevating table for directly mounting a vehicle can be moved up and down through an X-shaped parallel expansion / contraction mechanism, and a hydraulic cylinder is used as a driving means. . The lifters targeted by the present invention are arranged in parallel at a predetermined distance in pairs, and support both the left and right sides of the vehicle to be lifted up and placed between the lifters for inspection and repair work. It is configured so that it can be done. Therefore, the left and right lifts must always be at the same height to move up and down.
A "vehicle maintenance lift" related to No. 6397 is known. This lift has a communication path between the two ends of both pits, and is loosely fitted into the communication path to axially support the connecting shaft that spans both pits at one side end in the longitudinal direction of both pits and is parallel to the X-shape. Of the expansion and contraction mechanism, the lower ends of one of the paired links are fixed to the connecting shaft. Therefore, for example, even if the hydraulic pressure drops in one hydraulic cylinder, the expansion and contraction movements of the X-shaped parallel expansion / contraction mechanism are synchronized by the connecting shaft.
The heights of both lifts are always the same without any difference, and as a result, the safety of work is guaranteed because the vehicle that is placed and lifted does not tilt. Moreover, since the above-mentioned mechanism is extremely simple, it is easy to manufacture and there is no need for maintenance and inspection.

However, it is troublesome to use the connecting shaft for connecting the left and right lifters in production and installation work. That is, it is not easy to fix the ends of the respective links to the connecting shaft in the same direction in all directions, and a great difference occurs in the height of the lift table due to a slight difference in angle. In addition, it is difficult to transport when the link is fixed, and it is difficult to horizontally support the connecting shaft in the pit, and it takes a lot of man-hours to examine and install the horizontal level, which is a troublesome work. Become.

(Purpose of the Invention) As described above, in the structure in which the link end of the X-shaped parallel expansion / contraction mechanism is fixed to the connecting shaft by passing the connecting shaft between the left and right lifters, the above problems remain. The present invention is a technology developed to solve this problem, and with a simpler structure, the lift tables of both lifters are always moved up and down equally.
Moreover, we provide a vehicle maintenance lifter that is convenient for production and installation work.

(Structure of the present invention) The basic structure of the vehicle maintenance lifter according to the present invention has an X-type parallel expansion / contraction mechanism, and a lifting platform is attached to the upper end of the structure. The point of using a cylinder is the same as before. In the present invention, the drive hydraulic cylinders attached to the left and right lifters are not directly connected to the hydraulic unit, but the adjusting hydraulic cylinder is interposed in the middle. That is, the operating oil supplied from the hydraulic unit is once guided to the adjusting hydraulic cylinder, and the operating oil is supplied from the adjusting hydraulic cylinder to the left and right driving hydraulic cylinders.

Here, the adjusting hydraulic cylinder is an adjusting device that supplies the same amount of hydraulic oil to both drive hydraulic cylinders and always makes the protruding lengths of the piston rods equal, and its configuration has the following features. You The adjusting hydraulic cylinder is provided with a partition wall in the middle, partitions the cylinder chamber with the partition wall, and arranges pistons in the left and right partitioned cylinder chambers, and both pistons are connected by a piston rod. Therefore, the piston always slides in synchronization, and the pistons must operate so that their moving distances become equal, and piping is provided for guiding hydraulic oil from the hydraulic unit to the respective cylinder chambers. Further, the respective pipes are led out from the other cylinder chambers across the piston and are connected to the drive hydraulic cylinders. With the hydraulic circuit configured in this way, the left and right drive hydraulic cylinders can synchronize the movements of their piston rods. First, the hydraulic oil sent from the hydraulic unit enters the cylinder chamber of the adjusting hydraulic cylinder and slides the piston. . In this case, even if the amount of hydraulic oil supplied varies due to the resistance inside the pipe until it enters the cylinder chamber, the pistons move in the same way. Since the piston movements of both cylinder chambers are synchronized, the flow rates of the hydraulic oil sent out from the cylinder chambers are equal, so that the protrusion movement distances of the piston rods of the left and right drive hydraulic cylinders are equal, and the height of the lifter lift table is different. Does not occur. When lowering the lifting platform, the hydraulic pressure of the hydraulic oil is released to lower the platform by its own weight. Of course, in the case of forcibly lowering the lift table, piping for lowering is provided from the hydraulic unit.

Embodiments according to the present invention will be described below in detail with reference to the drawings.

(Embodiment) FIG. 1 is a specific example of a hydraulic circuit for operating the left and right drive hydraulic cylinders of the present invention, in which 1 is a left drive hydraulic cylinder,
2 is a right drive hydraulic cylinder, 3 is an adjusting hydraulic cylinder,
Reference numeral 4 represents a hydraulic unit. The adjusting hydraulic cylinder is a cylinder having an appropriate inner diameter and length, and a partition wall 5 is provided in the middle thereof, and the cylinder chamber is divided into left and right sides with the partition wall 5 sandwiched therebetween. Pistons 6a and 6b are arranged in the left and right cylinder chambers, and these pistons 6a and 6b are connected by a piston rod 7. The left and right cylinder chambers are partitioned by the pistons 6a, 6b and divided into cylinder chambers 8a, 9a, 8b, 9b.

A pipe 10 is piped from the hydraulic unit 4 and connected to the cylinder chambers 9a and 9b. On the other hand, pipes 11a and 11b are extended from the cylinder chambers 8a and 8b and led to the left and right drive hydraulic cylinders 1 and 2. . Here, the left drive hydraulic cylinder 1 is attached to the left side lifter, while the right drive hydraulic cylinder 2 is attached to the right side lifter, and raises and lowers the lifts of these lifters. Therefore, each cylinder chamber 8a, 9a, 8b, 9b of the adjusting hydraulic cylinder 3 and the pipes 10, 11
Is filled with hydraulic oil that does not contain air, and the hydraulic oil sent from the hydraulic unit 4 is adjusted hydraulic cylinder 3
The pistons 6a and 6b are moved equally, and as a result, the flow rates of the hydraulic oil guided from the cylinder chambers 8a and 8b to the left and right drive hydraulic cylinders 1 and 2 are always equal.

FIG. 2 shows a detailed view around the partition wall 5 and the piston 6a. The cylinders 13a and 13b are connected by screws 12a and 12b formed on the left and right sides of the partition wall 5, and the piston rod 7a and 7b are connected to the piston 6a. It has a connected structure. Of course, the construction of the adjusting hydraulic cylinder 3 of the present invention is not limited to the case of FIG. FIG. 3 is a specific example of a lifter including the hydraulic cylinders 1, 2, and 3. In the figure, 21 is a rectangular pit dug and formed on the floor surface.
21 are provided in parallel at a predetermined interval. A bearing 22 is arranged on the side surface of the pit 21, and a shaft 23 is rotatably supported between the bearings 22 and 22. The rails 24, 24 having a U-shaped cross section are horizontally installed. Then, as shown in the figure, the lifter has an X-shaped parallel expansion / contraction mechanism, and is constructed by connecting the X-shaped parallel expansion / contraction mechanism in upper and lower two stages,
A lift 25 is attached to the upper end.

The X-shaped parallel expansion / contraction mechanism is one in which links 26a and 26b, which are crossed and connected in an X-shape, are arranged in parallel, the lower end of the link 26a is attached to the shaft 23, and the roller 27 is attached to the lower end of the link 26b. Is rotatably supported, and the roller 27 is slidable along the rail 24. The upper and lower X-shaped parallel expansion / contraction mechanisms are connected to each other by a shaft 28. The end of the left drive hydraulic cylinder is a bearing fixed to the shaft 23 of the left lifter.
The piston rod 14 is pivotally supported by 29, and the tip of the piston rod 14 is connected to a shaft 30 suspended from the upper ends of the links 26b, 26b constituting the upper X-shaped parallel expansion and contraction mechanism. Similarly, the right drive hydraulic cylinder 2 is similarly attached to the right lifter, and the X-shaped parallel expansion / contraction mechanism is expanded / contracted by the expansion / contraction action of the piston rods 14 and 15 of these hydraulic cylinders 1 and 2, and the lifting table 25 is moved up and down. . A rack 31 is arranged parallel to the piston rods 14 and 15 on the piston rods 14 and 15 side, and a locking claw 32 attached to the hydraulic cylinder main body side is in a relationship capable of engaging with the rack 31. Function as a safety device. By the way, an auxiliary pit 33 is dug in the floor surface, and the adjusting hydraulic cylinder 3 is set in the auxiliary pit 33, as shown in FIG. 1 between the horizontal drive hydraulic cylinders 1 and 2. A hydraulic circuit is configured.

Here, as a specific example, in FIG. 3, the explanation has been made using the lifter in which the X-type parallel expansion / contraction mechanism is configured in two stages, but it may be a one-stage X-type parallel expansion / contraction mechanism, and conversely 3 It doesn't matter if it is a tier. Also, the drive hydraulic cylinders 1 and 2 described above.
The mounting form is also arbitrary, and the X-shaped parallel expansion / contraction mechanism may be expanded / contracted by the expansion / contraction action of the piston rods 14 and 15 so that the elevating table 25 can be moved up and down.

As described above, the lifter according to the present invention has the adjusting hydraulic cylinder interposed between the hydraulic unit and the left and right driving hydraulic cylinders, and the following effects can be obtained.

(Effects) (1) Since the lifter of the present invention is not driven by the drive hydraulic cylinder directly connected to the hydraulic unit, but has the adjusting hydraulic cylinder interposed, the left and right drive hydraulic cylinders operate in synchronization. , The protruding lengths of their piston rods are always equal, thus keeping the height of the platform equal. That is, the flow rate of the hydraulic oil sent from the cylinder chamber of the adjusting hydraulic cylinder to each driving hydraulic cylinder is always the same.

(2) Further, in the lifter of the present invention, by using this adjusting hydraulic cylinder, the adjusting hydraulic cylinder of the same size can be used without being influenced by the size of the lifter, and the structure of the entire lifter is simplified, so that the installation is easy. Work can be done easily.

[Brief description of drawings]

FIG. 1 is a specific example of a hydraulic circuit used in a lifter according to the present invention, FIG. 2 is a detailed example of a partition of an adjusting hydraulic cylinder, and FIG. 3 is a specific example of a lifter including an X-type parallel expansion / contraction mechanism. Examples are shown respectively. 1 ... Left drive hydraulic cylinder, 2 ... Right drive hydraulic cylinder, 3 ... Adjusting hydraulic cylinder, 4 ... Hydraulic unit, 5 ... Partition wall, 6 ... Piston, 7, 14, 15 ... Piston rod, 8, 9 ... Cylinder chamber, 10 , 11 ... pipe, 12 ... screw, 13 ... cylinder, 21 ... pit, 22,29 ... bearing, 23,28 ... axle, 24 ... rail, 25 ... lift, 26 ... link, 27 ... roller, 30 ... shaft, 31 ... Rack, 32 ... Locking claw, 33 ... Auxiliary pit

Claims (1)

[Scope of utility model registration request] 1. Left and right lifters arranged side by side at a predetermined interval, wherein the lifters are constructed by using an X-shaped parallel expansion / contraction mechanism, and an elevating table is attached to an upper end thereof, and the X-shaped parallel expansion / contraction is performed. Adjusting between the unit that sends out hydraulic oil and the drive hydraulic cylinder in the lifter that performs the expansion and contraction of the mechanism and the up and down movement of the lift table by the expansion and contraction of the piston rod of the drive hydraulic cylinder attached to an appropriate place. A hydraulic cylinder is provided, the adjusting hydraulic cylinder has a partition wall in the middle, and pistons are arranged in the left and right cylinder chambers that sandwich the partition wall.These pistons are connected by a piston rod, and one side is further partitioned by these pistons. Connect the pipe led out from the above hydraulic unit to the cylinder chamber of the Pipe extending from Nda chamber vehicle servicing lifter, characterized in that connected to the respective drive hydraulic cylinder which is attached to the right and left of the lifter.