JPH0592683U - Intermediate lift device for chassis dynamometer - Google Patents

Abstract

(57) [Abstract] [Purpose] To newly provide an intermediate lift device for a chassis dynamometer, which has a simple structure and can be operated only by a pneumatic circuit without using hydraulic pressure. [Structure] A structure in which a plurality of air cylinders 21 are installed on a base 11, and a movable base 12 is attached to a free end portion of a piston rod 15 which guides a sliding operation by a linear bearing 26 provided on the air cylinder 21.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an intermediate lift which is installed in a twin roller type chassis dynamometer and is used to separate a tire from a roller.

[0002]

[Prior Art]

 Generally, chassis dynamometers are widely used for performance tests of automobiles (driving resistance, climbing and descending, vehicle weight, exhaust gas characteristics, fuel consumption characteristics, etc.). The chassis dynamometer can easily perform experiments equivalent to running a vehicle on the actual road indoors with good reproducibility.

As a conventional chassis dynamometer, there is a twin roller chassis dynamometer as illustrated in FIGS. 3 to 6. This arranges the free roller 2 in parallel with the roller dynamo 1 as shown in FIG. Further, the load roller 3 and the free roller 4 are arranged in parallel. Then, the roller dynamo 1 and the load roller 3 are connected by a coaxial connecting shaft 5, and the two free rollers 2, 4 are connected by a coaxial connecting shaft 6. Further, a winding transmission mechanism 7 by a timing belt and a clutch 8 are mounted between the roller dynamo 1 and the free roller 2, between the two connecting shafts 5 and 6, and between the load roller 3 and the free roller 4, respectively. It is configured so that interlocking disconnection operation is possible. In this chassis dynamometer, as shown in FIG. 4, an intermediate lift 9 is installed between the roller dynamo 1 and the free roller 2 and between the load roller 3 and the free roller 4, respectively. The intermediate lift 9 lifts each tire 10 placed between the roller dynamo 1 and the free roller 2 or between the load roller 3 and the free roller 4 from below and separates it from each roller 1, 2 or 3, 4. is there. As shown in FIGS. 5 and 6, the intermediate lift 9 has a movable base 12 mounted on a base 11 using two linear bearing guides 13 so as to be vertically movable. At the same time, the tip of the piston rod 15 of the hydraulic cylinder 14 installed on the base 11 is fixed to the movable base 12, and the hydraulic cylinder 14 is driven by a fluid circuit as illustrated in FIG. Move to. This fluid circuit utilizes compressed air generally used in the factory. Therefore, the coupler 16 is connected to the compressed air source (not shown). A pressure control unit 17 is connected to the coupler 16, an electromagnetic switching valve 18 is connected to the coupler 16, and two direct pressure type pressure boosters 19 are further connected to form a pneumatic circuit for generating hydraulic pressure.

Each direct pressure booster 19 is connected to the hydraulic cylinder 14 via a variable throttle valve 20. At the same time, by connecting the electromagnetic switching valve 18 and the hydraulic cylinder 14, a hydraulic circuit that drives the hydraulic cylinder 14 by hydraulic pressure to raise the movable table 12 and lowers the movable table 12 by air pressure is provided. Constitute.

When a test is performed using the chassis dynamometer configured as described above, there are many items that must be managed, and if this control is inappropriate, a satisfactory simulation cannot be performed. One of the factors to be controlled is the setting of running resistance. Since warming up of the chassis dynamometer and mechanical loss (mechanical loss) are involved when setting this running resistance value, the mechanical dynamometer was first measured after warming up the chassis dynamometer.

When measuring the mechanical loss, the vehicle tire 10 mounted on the chassis dynamometer must be separated from the rollers 1, 2, 3, and 4. Therefore, the electromagnetic switching valve 18 is operated, the hydraulic cylinder 14 is driven, the movable table 12 is raised, the tire 10 is raised, and the rollers 1, 2, 3, 4 are separated. After setting the running resistance value, the electromagnetic switching valve 18 is operated, the hydraulic cylinder 14 is moved, the movable base 12 is lowered, and the tire 10 is set on the rollers 1, 2, 3, 4.

[0007]

[Problems to be solved by the device]

 In the conventional intermediate dynamometer lifter for chassis dynamometer as described above, since the distance between the roller dynamo 1 and the free roller 2, and the load roller 3 and the free roller 4 is narrow, the outer dimension of the intermediate lift 9 installed in the space between them is also small. Be restricted to one. Therefore, the cylinder for lifting the movable table 12 must also have a small sectional area. However, since the cylinder must drive a load of about 800 kg, it is not possible to use one that is driven by air pressure, and a hydraulic cylinder must be used, and the compressed air used in the factory is boosted and converted into hydraulic pressure. A circuit is needed. For this reason, a space for installing a pneumatic / hydraulic converter, a pressure booster, etc. is required, and the device becomes large. Furthermore, there was the problem that maintenance was required to prevent air leaks and prevent oil leaks.

Further, since the hydraulic cylinder 14 also uses the liquid sealing material in the upper part thereof, the hydraulic cylinder 14 alone cannot provide proof strength in the front-rear direction and the left-right direction. Therefore, it is necessary to use two linear bearing guides 13 so that the structure has a proof stress in the front-rear direction and the left-right direction, which complicates the structure. Furthermore, there is a problem that alignment of the linear bearing guide 13 is difficult, manufacturing is difficult, and the cost of the apparatus is high.

The present invention has been made in view of the above points, and an object of the present invention is to newly provide an intermediate lift device which is simple in structure and operates at a low cost.

[0010]

[Means for Solving the Problems]

 The intermediate lift device for chassis dynamometer of the present invention has a plurality of air cylinders installed on the base, and the required air cylinders are equipped with linear bearings on top of them to support the piston rod. It is characterized in that the parts are attached to a movable table, and a pneumatic circuit connected to a compressed air source is connected to these air cylinders.

[0011]

[Action]

 With the above-described configuration, the switching valve of the pneumatic circuit in the intermediate lift device is operated to supply compressed air to the air cylinder for an ascending operation, and the compressed air in the air cylinder is exhausted for a descending operation. At the same time, a linear bearing that guides the piston rod guides and supports the lifting operation.

[0012]

【Example】

 An embodiment of an intermediate lift device for a chassis dynamometer according to the present invention will be described below with reference to FIGS. 1 and 2. 1 and 2, parts corresponding to those of the conventional example shown in FIGS. 3 to 6 are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a partial cross-sectional front view showing the apparatus of this example taken out, where 11 is a base and 12 is a movable table. Four air cylinders 21 are installed on the base 11 so that the total load is 800 kg. A piston 22 is slidably mounted inside each air cylinder 21. The air cylinder 21 that hits both ends of FIG. 1 has a linear bearing 26 mounted on the seal portion between the piston rod 15 attached to the piston 22 and the upper portion of the cylinder 21, and the bearing capacity of the piston 22 in the front-rear and left-right directions. And is configured to support the sliding motion. The free ends of the piston rods 15 supported by the linear bearings 26 are fixed to the movable table 12. The free ends of the piston rods 15 of the two air cylinders 21 in the middle of the figure without the linear bearings 26 are configured to be brought into contact with and supported by the movable base 12.

The intermediate lift device configured as described above is operated by a pneumatic circuit as shown in FIG. This pneumatic circuit is used by connecting it to a compressed air source (not shown, which supplies air having a pressure of 5 kg / cm ² ) with a coupler 16. A pressure control unit 17 is connected to the coupler 16 via a stop valve 23. Further, the compressed air whose pressure is controlled by the pressure control unit 17 is sent to the switching solenoid valve 24, and from this, it is sent to the four air cylinders 21. A silencer 25 is installed on each of the switching solenoid valve 24 and the four air cylinders 21.

Next, the operation of the apparatus of this example configured as described above will be described. In the device of this example, when the tire 10 is separated from the rollers 1, 2, 3, 4 when measuring the mechanical loss of the chassis dynamometer, etc., the switching solenoid valve 24 is operated to squeeze the compressed air into the four air cylinders 21, respectively. To send. Then, the movable table 12 supported by the piston rods 15 of the four air cylinders 21 ascends and lifts the tire 10 to maintain its state. During this period, measurement of mechanical loss is executed. After the measurement, the switching solenoid valve 24 is operated to discharge the compressed air in the air cylinder 21 while narrowing the exhaust port. As a result, the movable table 12 descends, and the tire 10 is placed on the rollers 1, 2, 3, 4.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various other configurations can be adopted without departing from the scope of the present invention.

[0017]

[Effect of the device]

 As described above in detail, according to the intermediate lift device for the chassis dynamometer of the present invention, a plurality of air cylinders are installed on the base, and the required air cylinders are fitted with the linear bearings on the upper part thereof to mount the piston rods. Support, attach the end of this piston rod to the movable table, connect the pneumatic circuit connected to the compressed air source to these air cylinders, and operate the switching valve of this pneumatic circuit to send compressed air to the air cylinder. In addition to the upward movement, the compressed air in the air cylinder is exhausted to lower the air, and the linear bearing that guides the piston rod guides the vertical movement of the compressed air. No need for equipment to convert the pressure to increase the pressure, and the linear bearing guide that guides the up-and-down movement of the movable table can be dispensed with. And then, it can be made compact overall device, the structure is simplified, there is an effect that it provides an inexpensive product. Furthermore, since an air cylinder is used, there is no risk of oil leakage and there is no need to remove air from the oil, which has the effect of facilitating maintenance.

[Brief description of drawings]

FIG. 1 is a partially sectional front view showing an embodiment of an intermediate lift device for a chassis dynamometer of the present invention.

FIG. 2 is an explanatory diagram of a pneumatic circuit of the above embodiment.

FIG. 3 is an overall plan view illustrating a conventional twin roller chassis dynamometer.

FIG. 4 is a schematic side view of a main part of the conventional example.

FIG. 5 is a front view of an intermediate lift portion of the conventional example.

FIG. 6 is an explanatory diagram of a fluid circuit of the conventional example.

[Explanation of symbols]

 1, 2, 3, 4 ... Roller 10 ... Tire 11 ... Base 12 ... Movable base 15 ... Piston rod 21 ... Air cylinder 22 ... Piston 24 ... Switching solenoid valve 25 ... Silencer 26 ... Linear bearing

Claims (1)

[Scope of utility model registration request] 1. A plurality of air cylinders are installed on a base, a linear bearing is mounted on an upper part of the required air cylinder to slidably support a piston rod, and an end portion of the piston rod serves as a movable base. An intermediate lift device for a chassis dynamometer, characterized in that it is fixed and is operated by a pneumatic circuit device that connects the air cylinder to a compressed air source to raise and lower the movable table.