JPH072954U - Flat chassis dynamometer - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a flat chassis dynamometer capable of preventing the belt from being uncontrollable due to mechanical or thermal deformation of the roller. [Structure] A dynamometer 4 is housed inside a front roller 1 to form a roller dynamometer 5, and a steel belt 3 is wound around the roller dynamometer 5 and the rear roller 2. In the roller dynamometer 5, the rotor frame 29 is fitted on the outer circumference of the rotor core 9, the front roller 1 is fitted on the outer circumference of the rotor frame 29, and the rotor core 9 and the rotor frame 29 are welded to each other. Increase rigidity,
During rotation, the rotor frame 29 is prevented from being deformed, the front roller 1 is prevented from being deformed, and the steel belt 3 is easily controlled.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a flat chassis dynamometer having a roller dynamometer in which a dynamometer is incorporated inside a roller and for testing a completed vehicle.

[0002]

[Prior art]

 FIG. 5 is a schematic configuration diagram of a conventional flat chassis dynamometer, in which 1 is a pair of left and right front rollers, a dynamometer 4 is provided inside, and a roller dynamometer 5 is formed. Reference numeral 2 denotes a rear roller, 3 denotes a roller dynamometer 5 and a steel belt wound around the rear roller 2. In the test, the left and right tires 6 on the drive wheel side of the vehicle under test 31 are placed on the central portion of the steel belt 3 kept flat, and the dynamometer 4 absorbs and drives the power.

FIG. 6 shows a sectional view of a front roller 1 having a dynamometer 4 accommodated therein, that is, a roller dynamometer 5, where 7 is a stator shaft, 8 is a stator core attached to a stator shaft 7, and 9 is a front side. A rotor core 10 is provided inside the roller 1 so as to face the stator core 8, 10 is a torque arm attached to one end of the stator shaft 7, and 11 is a load cell connected to the torque arm 10. One end of the stator shaft 7 is supported by the support member 13 via the bearing 12, and the other end of the stator shaft 7 is supported by the one side plate 15 of the front roller 1 via the bearing 14. The other side plate 16 of the front roller 1 is supported by one end of the stator shaft 7 via a bearing 17, and the connecting shaft 18 attached to the projecting portion 15a of the one side plate 15 is supported by the support member 20 via a bearing 19. To be done.

In the flat chassis dynamometer configured as described above, the rotation of the tire 6 is transmitted to the front roller 1 via the steel belt 3, which causes the rotor core 9 to rotate and absorb power between the stator core 8 (power generation). ) Is performed, and the reaction force is measured by the load cell 11 via the torque arm 10. Conversely, the tire 6 can be driven by driving the dynamometer 4 side. Further, the side plate 16 is provided with the hole 21, and the air from the cooling fan 22 is introduced into the inside through the ventilation duct 23 and the hole 21 to cool the stator core 8 and the rotor core 9 and then discharged from the hole 24 provided in the side plate 15. Suru

Further, a disc 25 is provided on the outer periphery of the protruding portion 15a, and the roller dynamometer 5 is stopped by tightening a hydraulic disc brake 26, which is used as a roller lock and an emergency stop brake when the vehicle 5 gets in and out of the vehicle. Further, the behavior of the steel belt 3 is detected by the edge sensor 27, and the tensions on both sides of the steel belt 3 are servo-controlled in accordance with the behavior to suppress meandering during rotation of the steel belt 3. A clutch is provided between the pair of connecting shafts 18 so that the pair of roller dynamometers 5 can be detachably connected. 28 is a support stand.

[0006]

[Problems to be solved by the device]

 In the above flat chassis dynamometer, a rotor frame is actually provided between the front roller 1 and the rotor core 9, and the front roller 1 is made of aluminum in a simple cylindrical shape. The rotor core 9 is formed by welding a ring material to the net. The rotor core 9 is formed by driving a copper bar into the core portion in which laminated silicon steel plates are integrated with a caulking plate, and brazing copper end rings at both ends. These are sequentially fitted and integrated, but each deformation at the time of rotation is different, and especially the deformation of the rotor frame deforms the front roller 1 having a simple shape into a complicated shape, and this deformation makes high rotation. The larger the centrifugal force, the larger it became, and the steel belt 3 became uncontrollable.

Further, the front roller 1 is deformed by the heat generation of the rotor core 9 and its diameter is changed, and the steel belt 3 is also uncontrollable due to the change of the rotation distance. Further, since the steel belt 3 and the front roller 1 repeatedly come into contact with and separate from each other, the traveling distance increases and the wear also increases. Usually, the surface of the front roller 1 is hardened, but it is difficult to completely eliminate the wear. As the wear progresses, it becomes difficult to control the steel belt 3. Further, as described above, the air from the cooling fan 22 is passed through the ventilation duct 23 and the holes 21 of the side plate 16 into the inside of the front roller 1 to cool both cores 8 and 9 which are electrically heated. , The holes are discharged from the holes 24 of the side plate 15, and the temperature on the left side is higher than the temperature on the right side in FIG. For this reason, the difference in thermal expansion due to this temperature difference causes a difference in the diameter of the front roller 2, and the left and right rotation distances thereof are different, which also makes it impossible to control the steel belt 3.

The present invention has been made to solve the above problems and provides a flat chassis dynamometer capable of preventing the control of the steel belt from being lost due to the deformation of the roller. With the goal.

[0009]

[Means for Solving the Problems]

 A flat chassis dynamometer according to claim 1 of the present invention is one in which a rotor frame is fitted to the outside of a rotor core of a roller dynamometer, a roller is fitted to the outside of the rotor frame, and the rotor frame and the rotor core are welded. Is.

In the flat chassis dynamometer according to claim 2, an iron rotor frame is fitted to the outer side of the rotor core of the roller dynamometer, and an aluminum roller is fitted to the outer side of the rotor frame. The roller and the rotor frame are only partially contacted.

Further, in the flat chassis dynamometer according to the third aspect, the cooling air to the roller dynamometer is made to flow into the inside from the first holes provided at the outer peripheral portions of both ends in the axial direction, and the inner peripheral side After being made to flow to the center side from, the air is discharged to the outside from the second holes provided in the portions closer to the center than the first holes at both ends in the axial direction.

[0012]

[Action]

 According to the first aspect of the present invention, the rotor frame and the rotor core are welded, the rigidity of the rotor frame is increased, deformation of the rotor frame during high speed rotation is prevented, deformation of the rollers is prevented, and control of the steel belt becomes easy.

In the second aspect, the roller and the rotor frame are only partially in contact with each other, and it is difficult for the heat generated in the rotor core to be transferred to the roller through the rotor frame, and the heat of the roller causes deformation. Is less likely to occur. Further, since the rotor frame is made of iron and the rollers are made of aluminum, shrink fitting and removal are easy due to the difference in the coefficient of thermal expansion, and surface treatment and replacement when the rollers are worn are easy.

In the present invention, the cooling air to the roller dynamometer flows into the inside from the outer peripheral portions of both axial ends, flows from the inner peripheral side toward the central side, and then moves toward the central portions of both axial ends. Since the temperature of the roller is discharged to the outside from the part, there is no temperature difference in the left and right directions, and thermal deformation is less likely to occur.

[0015]

【Example】

 Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 and 2 are a vertical sectional front view and a vertical sectional side view of a main part of a roller dynamometer of a flat chassis dynamometer according to a first embodiment, in which a front roller 1 is formed of aluminum into a cylindrical shape. The rotor frame 29 is formed by welding an iron ring material 29b to a skeleton 29a formed of a flat mesh in the axial direction. The rotor core 9 includes a core portion 9b obtained by laminating silicon steel sheets and crimping and integrating with a crimp portion 9a, a copper bar 9c driven into the core portion 9b, and copper ends brazed to both ends of the copper bar 9c. It is composed of a ring 9d. The rotor frame 29 is fitted on the outer circumference of the rotor core 9, and the front roller 1 is fitted on the outer circumference of the rotor frame 29 by shrinkage.

Then, the skeleton portion 29 a of the rotor frame 29 and the core portion 9 b of the rotor core 9 are fillet-welded at the welding portion 30 to form an integral structure. As a result, the rigidity of the rotor frame 29 in the radial direction is increased, deformation during rotation is prevented, and accordingly deformation of the front roller 1 is also prevented. Therefore, bulging of the outer diameter of the front roller 1 due to centrifugal force during high-speed rotation is prevented, the steel belt 3 is easily controlled, and a high-speed flat chassis dynamometer is obtained. In FIG. 1, reference numerals 32 and 33 are rotary shafts attached to the side plates 15 and 16, respectively, and are rotatably supported. Further, 34 and 35 are first and second holes provided in the side plates 15 and 16 for ventilation.

Further, in the first embodiment, the front roller 1 and the rotor frame 29 are in contact with each other only at the bone portion 29b at a position far from the rotor core 9 which is a heat source. Therefore, a gap 36 is formed between the front roller 1 and the rotor frame 29, heat from the rotor core 9 is less likely to be transferred to the front roller 1 via the rotor frame 29, and deformation of the front roller 1 is suppressed, and The control of the cheel belt 3 becomes easy. Further, the front roller 1 made of aluminum and the rotor frame 29 made of iron are shrink-fitted, but since aluminum has a higher coefficient of thermal expansion than iron, it is extremely easy to fit and separate each other, and the front roller 1 is It becomes easy to repair or re-harden it when it is worn, or to replace it, and it is also easy to control the steel belt 3.

Embodiment 2 FIG. 3 and FIG. 4 show a vertical sectional front view and a vertical sectional side view of a roller dynamometer in a flat chassis dynamometer according to a second embodiment. Reference numerals 37 and 38 denote a stator shaft 7 and side plates 15 and 16, respectively. Bearings provided therebetween, 41 and 42 are support members that rotatably support the rotary shafts 32 and 33 via bearings 39 and 40, 43 is a circular duct provided outside the side plates 15 and 16, and 44 is a rotor. It is a partition plate that partitions the inner peripheral side of the frame 29.

In the above structure, the cooling air from the cooling fan flows into the inside through the left and right first holes 34 provided near the outer peripheries of the side plates 15 and 16 through the circular ducts 43 on both the left and right sides, and Thus, the cores 8 and 9 are cooled by passing through the rotor frame 29, the duct piece portions 8a and 9e of the cores 8 and 9 from the outer periphery to the center, and between the cores 8 and 9. Further, the cooling air is directed to the outside in the axial direction and is discharged to the outside from the second hole 35. Therefore, the temperature difference between the left and right when viewed from the center in the axial direction is eliminated, and the temperature near the outer circumference is reduced in the radial direction, so that thermal deformation of the front roller 1 can be suppressed and the control of the steel belt 3 can be facilitated. You can In addition, a water bearing is actually provided to support the steel belt 3 and the tire 6 thereon, but by providing a gap between the front roller 1 and the cooling air outlet of the circular duct 43, It is possible to prevent water droplets from the water bearing from entering the inside of the roller dynamometer 5 by blowing cooling air.

Also in the second embodiment, since the gap 36 is provided between the front roller 1 and the rotor frame 29, the deformation of the front roller 1 due to the heat conduction from the rotor core 9 can be suppressed, and Since the front roller 1 and the rotor frame 29 can be easily fitted and separated from each other, the front roller 1 can be easily treated against wear. Although the dynamometer 4 is incorporated in the front roller 1 in the first and second embodiments, the dynamometer 4 may be incorporated in the rear roller 2.

[0021]

[Effect of device]

 As described above, in claim 1, the rotor core and the rotor frame are integrated by welding, the rigidity of the rotor frame is increased and deformation during rotation is suppressed, and accordingly, deformation of the roller is also suppressed. Belt control becomes easier.

Further, according to claim 2, since the roller and the rotor frame are brought into contact with each other only partially, heat from the rotor core is hard to be transmitted to the roller, and thermal deformation of the roller is suppressed, so that the belt is prevented. It becomes easy to control. Also, since an aluminum roller, which has a higher coefficient of thermal expansion than iron, is shrink-fitted on the outer circumference of the iron rotor frame, it is extremely easy to fit and separate the roller, and it is easy to perform correction processing and replacement when the roller wears. It is possible to prevent uncontrollability of the belt due to wear.

According to the third aspect of the invention, the cooling air is introduced from the outer periphery of both axial ends, flows from the outer side to the inner side in the radial direction, and is discharged to the outside from the central portions of both axial ends. As a result, the temperature difference between the left and right when viewed from the center in the axial direction is eliminated, and the temperature near the outer circumference in the radial direction is reduced, so that thermal deformation of the rollers is suppressed and the control of the belt can be facilitated.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a roller dynamometer of a flat chassis dynamometer according to a first embodiment.

FIG. 2 is a vertical sectional side view of a roller dynamometer of the flat chassis dynamometer according to the first embodiment.

FIG. 3 is a vertical sectional front view of a roller dynamometer of a flat chassis dynamometer according to a second embodiment.

FIG. 4 is a vertical sectional side view of a roller dynamometer of a flat chassis dynamometer according to a second embodiment.

FIG. 5 is a schematic configuration diagram of a flat chassis dynamometer of Rakirai.

FIG. 6 is a vertical sectional front view of a roller dynamometer of a flat chassis dynamometer of the future.

[Explanation of symbols]

 1 ... Front roller 2 ... Rear roller 3 ... Steel belt 4 ... Dynamometer 5 ... Roller dynamometer 6 ... Tire 8 ... Stator core 9 ... Rotor core 29 ... Rotor frame 30 ... Welded portion 31 ... Test vehicle 34 ... First hole 35 … Second hole 36… Gap

Claims (3)

[Scope of utility model registration request] 1. A flat chassis dynamometer having a roller dynamometer in which a dynamometer is incorporated inside a roller and a belt around the other rollers, and tires of a test vehicle placed on the flat belt. A flat chassis dynamometer characterized in that a rotor frame is fitted on the outer side of a rotor core, a roller is fitted on the outer side of the rotor frame, and the rotor frame and the rotor core are welded. 2. A flat chassis dynamometer having a roller dynamometer in which a dynamometer is incorporated inside a roller and a belt around the other rollers, and tires of a test vehicle placed on the flat belt. A flat plate characterized in that an iron rotor frame is fitted on the outer side of the rotor core, an aluminum roller is fitted on the outer side of the rotor frame, and the roller and the rotor frame are only partially in contact with each other. Chassis dynamometer. 3. A flat chassis dynamometer having a roller dynamometer in which a dynamometer is incorporated inside a roller and a belt around another roller, and tires of a test vehicle placed on the flat belt. Cooling air from the inside is introduced into the inside from the first holes provided in the outer peripheral portions at both axial ends, and is made to flow from the inner peripheral side to the central side, and then closer to the center from the first holes at both axial ends. A flat chassis dynamometer characterized in that it is discharged to the outside through a second hole provided in the portion.