JP4346638B2 - Reducer with built-in one-way clutch for automobile brake speed test - Google Patents

Description

  The present invention relates to a reduction gear incorporating a one-way clutch for a vehicle brake speed test.

  Conventionally, a combined testing machine capable of performing both a brake test and a speedometer test of an automobile used at a car inspection site or the like uses a combination of a speed reducer and a one-way clutch.

  FIG. 3 is a plan view of a conventional test machine for both a brake test and a speedometer test. The test machine A1 includes a pair of left and right speed reducers A2, and a one-way clutch A4 is provided on each rotary shaft A3. The active roller A5 is connected through the gap (for example, see Patent Document 1).

  Further, a pair of idler rollers A6 are provided in parallel with the respective active rollers A5 at an appropriate interval, and a generator A7 to which a generated voltage indicating device is connected is connected to one of them.

  The left and right idle rollers A6 can be connected and separated by an electromagnetic clutch A8.

  When a vehicle brake test is performed by the test machine, the left and right wheels of the vehicle to be tested are placed on the left and right active rollers A5 and the idler roller A6, and the rotating shaft A3 is decelerated while the electromagnetic clutch A8 is disconnected. Driven from the machine A2 side, the active roller A5 is rotated through the one-way clutch A4.

  If it does so, the wheel of a motor vehicle will be rotated by active roller A5, and if the brake of a motor vehicle is operated in this state, the resistance torque will be measured with the power measuring device provided in reduction gear A2.

  By measuring the resistance torque for each of the left and right wheels, it is tested whether an appropriate braking force is obtained.

  When performing a speedometer test of an automobile, the left and right drive wheels of the automobile to be tested are placed on the left and right active rollers A5 and idler rollers A6, and the engine is started to rotate the left and right drive wheels.

  As a result, the active roller A5 and the idle roller A6 indicating the respective drive wheels are rotated by the drive wheels of the automobile. In the case of the speedometer test, the electromagnetic clutch A8 is connected so that the vehicle differential does not operate.

  The rotation of the idle roller A6 is transmitted to the generator A7, and a voltage corresponding to the rotational speed of the driving wheel is displayed on the power generation voltage indicating device connected thereto, and the displayed value and the value displayed on the speedometer. Is tested to see if the speedometer displays the proper value.

At this time, since the one-way clutch A4 is idled and the rotation is not transmitted from the active roller A5 to the rotating shaft A3 side, the rotation resistance acting on the driving wheel of the automobile from the active roller A6 side is small and can be rotated at high speed. it can.
Japanese Utility Model Publication No. 49-7988

  In the conventional test machine for both the brake test and the speedometer test as described above, the reduction gear and the one-way clutch are configured as separate units. The number of assembly steps is large, and a large installation space is required for the drive system for rotating the active roller.

On the other hand, a reduction gear with a built-in one-way clutch in a gear case has also been manufactured.
FIG. 4 is a partial sectional view showing the structure of a conventional one-way clutch built-in speed reducer. The one-way clutch built-in speed reducer B1 is inserted into the gear case B2 from the outside and is rotatably supported by a bearing B3. The inner ring B6 of the one-way clutch B5 is externally fitted and keyed to the wheel driven shaft B4, and the final reduction stage worm wheel B8 is externally fitted to the outer circumference of the outer ring B7 and keyed. The worm wheel B8 meshes with a worm (not shown), and the worm is further connected to a motor shaft through a plurality of gears.

  If such a one-way clutch built-in speed reducer B1 is used in the test machine as shown in FIG. 3 described above, it is considered that the installation space of the drive system for rotating the wheels of the automobile can be reduced.

  However, in this case, the wheel driven shaft B4 of the one-way clutch built-in speed reducer B1 serves as an active roller shaft for mounting and rotating a wheel of an automobile, and therefore, when assembled to the wheel driven shaft B4. First, in a state where the gear case B2 is disassembled, the shaft end of the wheel driven shaft B4 is inserted into the gear case B2, and the one-way clutch B5 in which the worm wheel B8 is separately attached to the outer ring B6 is combined with the bearing B3 and the wheel driven shaft B4. It is necessary to assemble the gear case B2 after being mounted on the motor, and even when such a one-way clutch built-in speed reducer B1 is used, the number of assembling steps of the tester is not reduced and the gear case is assembled on site. Therefore, there is a problem that the assembly work becomes complicated.

  Therefore, the present invention eliminates the problems of the prior art as described above, incorporates a one-way clutch between the gear of the final reduction stage, which is a worm wheel, and the output shaft, reduces the number of parts, and allows assembly and adjustment. It can be easily performed and the size of the reduction gear can be reduced, and the driven shaft for the wheel can be seen from both ends of the output shaft with both ends exposed to the outside of the gear case without disassembling the gear case. It is an object of the present invention to provide a one-way clutch built-in speed reducer for automobile brake speed test that can be assembled and can easily perform assembly work of a wheel driven shaft.

  In order to achieve the above object, a one-way clutch built-in speed reducer for automobile brake speed test according to the present invention is rotatably supported by a gear case so that both ends are exposed to the outside of the gear case and the gear case is disassembled. A hollow output shaft through which a shaft hole for rotating a wheel driven shaft coaxially from one end and rotating integrally is opened, and an output provided on the outer periphery of the output shaft An inner ring that rotates integrally with the shaft, an outer ring that is disposed concentrically on the outer side of the inner ring and that rotatably supports the output shaft, and is interposed between opposing surfaces of the inner ring and the outer ring. A clutch member that transmits only a relative rotation in one direction between them, and a final reduction gear that is coaxial with the output shaft and rotates integrally with the outer ring. Is Le.

  Therefore, the one-way clutch built-in speed reducer for automobile brake speed test according to the present invention has a wheel driven shaft fitted to the end of the output shaft by a rotational drive source such as a motor connected to the input side. In the case of rotational driving, the rotation of the rotational drive source is decelerated inside the reducer and transmitted to the gear of the final reduction stage which is a worm wheel, and the outer ring is also rotated integrally with the gear of the final reduction stage which is a worm wheel. .

  The rotation of the outer ring is transmitted from the inner ring to the output shaft via a clutch member made of a cam or the like, that is, the output shaft rotates integrally with the inner ring, and as a result, the output shaft is a final reduction gear stage that is a worm wheel. The wheel driven shaft connected to the output shaft is driven to rotate.

  On the other hand, when the driving source is stopped and the wheel driven shaft is rotated in the same direction as the rotational direction driven through the one-way clutch built-in speed reducer of the present invention from the driving source side, The clutch member interposed between the inner ring and the outer ring does not transmit rotational force between them, and the inner ring and the outer ring can freely rotate relative to each other, so that the inner ring and the output shaft rotate together. The rotation of the wheel driven shaft is not transmitted to the drive source side via the final reduction gear, which is a worm wheel, and the wheel driven shaft can be freely rotated.

As described above, according to the reduction mechanism with a built-in one-way clutch for automobile brake speed testing according to the present invention, the one-way clutch is incorporated between the gear of the final reduction stage, which is a worm wheel, and the output shaft. When the wheel drive shaft is rotated in the same direction as the rotation driven to rotate from the drive source side with the drive source stopped, the wheel drive shaft rotating integrally with the output shaft Rotation is not transmitted to the drive source side, and the driven shaft for wheels can be freely rotated, has few parts, can be easily assembled and adjusted, and the size of the reducer is compact. Can be
Further, a shaft case that penetrates both ends of the hollow output shaft is formed, and the driven shaft for a wheel is coaxially inserted into the shaft hole from either one of the end portions. Since the driven shaft for wheels can be assembled from either direction of both ends of the output shaft with both ends exposed to the outside of the gear case without disassembling the wheel, the assembly operation of the driven shaft for wheels can be easily performed. .

  As a result, it was used as a dual-purpose tester that can perform both the brake test and speedometer test of automobiles, and was used in a device that included both a speed reducer and a one-way clutch in the power transmission system. And the assembly work of the apparatus at the site can be performed quickly and easily.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional view showing a first embodiment of a speed reducer with a built-in one-way clutch for automobile brake speed test according to the present invention, and FIG. 2 is a cross-sectional view taken along line AA in FIG. FIG.
As shown in these figures, a one-way clutch built-in speed reducer 1 for automobile brake speed test (hereinafter simply referred to as a speed reducer) has a gear case 3 to which a motor 2 is connected.

  A pinion 2B is formed on the outer periphery of the front end of the rotating shaft 2A of the motor 2, and this pinion 2B is one end of a worm shaft 5 that is rotatably supported in the gear case 3 by bearings 4A and 4B. Is engaged with a helical gear 6 provided in

  A worm 7 is integrally formed on the outer periphery of the central portion of the worm shaft 5, and the worm 7 meshes with a worm wheel 8 used as a gear for the final reduction stage.

The worm wheel 8 is concentrically disposed on the output shaft 10 that is rotatably supported by the gear case 3 by a pair of bearings 9A and 9B and both ends are exposed to the outside of the gear case 3.
The central hole 8A of the worm wheel 8 is fitted to the outer peripheral surface of the outer ring 11A of the one-way clutch 11 provided on the outer periphery of the output shaft 10, and is rotated and fixed to the outer ring 11A by the key 12. Yes.

  In this embodiment, the one-way clutch 11 is integrated with the output shaft 10, has no independent inner ring, the output shaft central portion 10 </ b> A is also used as the inner ring, and is externally fitted on both sides of the output shaft central portion 10 </ b> A. An outer ring 11A is rotatably supported on the output shaft 10 by a pair of bearings 11B and 11C.

  Further, a clutch member 11D is provided between the outer peripheral surface of the output shaft central portion 10A and the inner peripheral surface of the outer ring 11A.

  The one-way clutch 11 used in the present embodiment is of a cam clutch type, and the clutch member 11D has a number of hook-shaped cams and functions of the inner ring and the inner ring of the outer ring 11A. It is comprised with the spring member for making it contact | abut to the outer peripheral surface of 10 A of output-shaft center parts which satisfy | fill.

  The output shaft 10 is formed in a hollow shape with a shaft hole 10B passing through the center, and the wheel driven shaft 14 is inserted from one end of the shaft hole 10B exposed to the outside of the gear case 3. The key 13 is detachably connected to the output shaft 10 so as to rotate integrally therewith.

  Note that the tip end portion of the wheel driven shaft 14 to be inserted into the shaft hole 10B of the output shaft 10 has a smaller diameter than the original portion, and the stepped portion a is abutted against the end surface of the output shaft 10. Positioning in the axial direction between the output shaft 10 and the wheel driven shaft 14 is performed in contact therewith.

Next, the operation of the speed reducer 1 configured as described above will be described.
First, when the wheel driven shaft 14 is driven from the motor 2 side, when the rotary shaft 2A of the motor 2 is driven to rotate, the rotation is decelerated and transmitted from the pinion 2B to the helical gear 6, and the helical gear 6 is provided. The worm shaft 5 is rotated.

  The rotation of the worm shaft 5 is greatly decelerated and transmitted from the worm 7 to the worm wheel 8 as the final reduction gear meshing with the worm 7, and the outer ring 11A of the one-way clutch 11 is rotated.

  The rotation direction of the outer ring 11A at this time is set in a direction in which the clutch member 11D prevents relative rotation between the outer ring 11A and the output shaft 10, and the output shaft 10 rotates integrally with the outer ring 11A and finally outputs. The rotation of the rotating shaft 2A of the motor 2 is decelerated and transmitted to the wheel driven shaft 14 connected to the shaft 10 by the key 13.

  Next, when a rotational force is applied to the wheel driven shaft 14 from the outside in the same direction as the rotation direction while the motor 2 is stopped, the output shaft 10 rotates together with the wheel driven shaft 14.

  In this case, the clutch member 11D of the one-way clutch 11 allows relative rotation between the output shaft 10 and the outer ring 11A, so that only the wheel driven shaft 14 and the output shaft 10 remain while the outer ring 11A is stopped. Is idle.

  In the reduction mechanism that sequentially decelerates and transmits rotation from the input side to the gear of the final reduction stage, which is a worm wheel supported on the output shaft via a one-way clutch, the gear of the final reduction stage, which is a worm wheel, is transmitted. The speed reduction mechanism other than the meshing worm shaft is not limited to that of the above-described embodiment, and various types of gears can be appropriately combined.

  In the embodiment described above, both ends of the output shaft are exposed to the outside of the gear case, and the wheel driven shaft can be inserted into the shaft hole of the output shaft from either the left or right direction of the gear case. is there.

  In the above-described embodiment, the cam clutch type one-way clutch is used. However, a roller is provided between the inner peripheral surface of the outer ring and the outer peripheral surface of the central portion of the output shaft where the facing distance changes like a wedge in the circumferential direction. A roller clutch type intervening as a clutch member, or a ratchet claw that engages with the ratchet tooth on one of the inner peripheral surface of the outer ring or the outer peripheral surface of the central portion of the output shaft and the other ratchet pawl as a clutch member. You may comprise the ratchet type thing supported movably.

  Further, in the embodiment, in order to reduce the number of parts and assembly man-hours of the reduction gear, the inner ring of the one-way clutch is also used as the output shaft, but the inner ring is configured as a separate unit from the output shaft. A one-way clutch may be incorporated between the gear of the final reduction gear, which is a worm wheel, and the output shaft.

  In addition, the inner ring of the one-way clutch is also used as the output shaft, and the gear of the final reduction stage, which is the worm wheel, is also used as the outer ring at the boss of the gear of the final reduction stage, By configuring the three portions of the one-way clutch and the output shaft as one unit, the number of parts of the reduction gear can be further reduced, and assembly and adjustment can be facilitated.

Sectional drawing which shows one Example of the one-way clutch built-in type reduction gear for motor vehicle brake speed tests of this invention. The fragmentary sectional view seen in the arrow direction in the AA line position of FIG. The top view of the conventional brake test and speedometer test combined use machine which uses a one-way clutch and a reduction gear in combination. The fragmentary sectional view which shows an example of the conventional one-way clutch built-in reduction gear.

1 ... Reducer (Reducer with built-in one-way clutch for automobile brake speed test)
2 ... Motor 2A ... Rotary shaft 2B ... Pinion 3 ... Gear case
4A, 4B ... Bearings 5 ... Worm shaft
6 ... Helical gear 7 ... Worm 8 ... Worm wheel (gear of final reduction gear)
8A ... Center hole
9A, 9B ... Bearing 10 ... Output shaft
10A: Output shaft central portion 10B: Shaft hole
11: One-way clutch 11A: Outer ring
11B, 11C ... Bearing 11D ... Clutch member
12, 13 ... key 14 ... driven shaft for wheel

Claims (1)

A shaft that is rotatably supported by a gear case, both ends are exposed to the outside of the gear case, and the driven shaft for a wheel is coaxially inserted from either one end portion without disassembling the gear case to rotate integrally. A hollow output shaft having a hole therethrough and open;
An inner ring provided on the outer periphery of the output shaft and rotating integrally with the output shaft;
An outer ring that is concentrically disposed on the outer side of the inner ring and rotatably supports the output shaft.
A clutch member that is interposed between opposing surfaces of the inner ring and the outer ring and transmits only a relative rotation in one direction between the inner ring and the outer ring;
A reduction gear having a built-in one-way clutch for automobile brake speed testing, comprising: a final reduction gear that is coaxial with the output shaft and integrally rotates with an outer ring, and wherein the final reduction gear is a worm wheel. .

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