JPS6235967Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive control device for variably controlling the gear ratio of a variable diameter belt transmission.

In general, in variable diameter belt transmissions, by controlling the distance between the fixed pulley and the sliding pulley on the drive side, the diameter of the contact circumference between the belt and the pulley is changed, and thereby the gear ratio of rotational power can be varied. I have to. Methods for controlling the distance between fixed and sliding pulleys include a hydraulic method and a screw winding method, but the former is expensive, so the latter is usually used. Conventionally, in either method, maintenance work such as belt replacement has been done by removing the driven or drive side pulley itself, or by removing the entire rotating shaft. When automating the control of the distance between the pulleys of the side pulley device, since this pulley device is linked to the pilot motor mechanism via a worm gear, etc.
There is a drawback that this belt replacement and maintenance becomes extremely complicated. In particular, when this type of belt transmission is used in a blower such as a cooling tower, it is installed in a hazardous location.
Furthermore, since there are various restrictions on maintenance work conditions such as the need to place the transmission within a narrow area, it is necessary to make improvements to the transmission that will simplify belt replacement work and the like.

An object of the present invention is to provide a drive control device for a transmission that simplifies maintenance work such as belt replacement. Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In the figure, 1 is an input rotating shaft connected to a power source such as an electric motor, 2 is an intermediate rotating shaft, and 3 is an output rotating shaft to which a load such as a blower fan is connected, each of which is sealed by a lid 12. It is installed inside the frame 11. Further, the input shaft 1 is provided with a drive-side pulley device 6 consisting of fixed and sliding pulleys 6a and 6b.
However, at one end of the intermediate shaft 2 there is also a driven pulley device 7 consisting of similar fixed and sliding pulleys 7a and 7b, between which the belt 4 is wound. On the other hand, a large diameter pulley 8 is attached to the output shaft 3.
However, a small diameter pulley 9 is attached to the other end of the intermediate shaft 2,
Three V-belts 5 are wound between both pulleys. The intermediate shaft 2 is supported by a fixed holder 13. The holding body 13 has three fixed arms 13a, 1
3b and 13c, each of which has a frame 1
Standing pillars 14a, 14b and 14 to be erected from 1
c and is fixed by stud bolts and nuts embedded therein. Further, this holding body 13 includes bolts 16a, 16b and 17.
The arcuate walls 15a of the projection pieces 14d and 14e are
15b to compensate for the elongation of the belt 5. On the other hand, above the driven pulley 7, there is a centrifugal blower 20, and an impeller 21 and a spiral cover 22 are provided on the spring portion of the pulley 7b.

Further, in the drive side pulley device 6, an operating threaded rod 25 is installed between both pulleys via a bearing.
A sprocket 26 is installed at its protruding open end. As the threaded rod 25 rotates, the guide 27 moves up and down, and the sliding pulley also moves up and down accordingly.

In FIG. 2, a transmission member or chain 28 is shown connected to the sprocket 26 and a pilot motor control device 30. Based on the control of this pilot motor control device 30, the belt 4 is controlled by the drive side and driven side pulley devices 6, 7.
The gear ratio is changed by shifting between the two. As a result, the speed of the output shaft 3 is controlled from the input shaft 1 via the intermediate shaft 2.

However, when replacing the belts 4 and 5, first remove the lid 12, and then attach the holder 13 to the stand columns 14a and 14.
Loosen the nuts fixed on b and 14c, shorten the distance between the intermediate shaft 2 and the input/output shafts 1 and 3, and remove the belts 4 and 5. However, in this case, as for the belt 4, as is clear from FIGS. 1 and 2, the belt 4 needs to straddle the transmission member 28, so the transmission member 28 must be separated from the sprocket 26.

Next, this situation will be explained with reference to FIGS. 3 to 5.

FIG. 3a shows a block diagram of the pilot motor control device 30 installed on the frame 11, and FIG. 3b shows a block diagram of the adjustment device of the drive pulley device 6. A casing 31 is provided on the outer wall of the frame 11.
is screwed, and a cover 32 is provided on the front surface of the casing 31 to seal it. A holding slide plate 33 having a T-shaped cross section is provided inside the slide plate 33, and a combination of a pilot motor 34 and a gear head 35 is mounted on its horizontal surface 3.
Installed on 3a. The back surface of the vertical surface 33b is used as a terminal operation board, and the casing 31
A lead wire (not shown) is drawn out and introduced through the wiring through-hole portion 51 .

4 and 5 are a cross-sectional view and a front view, respectively, of the transmission drive control device of FIG. 3.
As is clear from Figures 4 and 5, the casing 3
Bolt supports 38a, 38 are provided at the four corners of the inner wall of 1.
b, 38c and 38d, and the T-shaped slide plate 33 is fixed by bolts 39. A shaft hole 33c is formed in the horizontal surface 33a of the slide plate 33, and a through hole 33d for passing a gear is formed in the vertical surface 33b. There is a gear in the shaft hole 33c.
An output shaft 40 is protruded from the head 35, and a gear 41a and a sprocket 42 are connected thereto, respectively.
Furthermore, a bearing 43 and a bearing 44 are bolted to the bolt support parts 38b and 38d at the tip thereof. The rotational power of the gear 41a is further transmitted to the shaft 45 via gears 41b, 41c, and 41d.
The rotational power is transmitted from the gears 41e and 41f to the potentiometer 46, where it is converted into a rotation range of about 270 degrees. The shaft 45 is further provided with cams 47a, 47b, and switches 48a, 48 for high limit and low limit.
8b, respectively. 5
0 is a terminal board, and the energizing power of the pilot motor 34 and the signal line of the potentiometer 46 are taken in and out from this terminal board 50 through a wiring through hole 51. 52 is a capacitor for controlling the power phase of the pilot motor 34.

FIG. 3b shows an adjustment device that is integrated with the drive pulley device 6, as already shown in FIG. In the figure, the large diameter sprocket 26 is connected to the small diameter sprocket 42 and chain transmission member 6 shown in FIG.
Controlled via 0. In this case, the output shaft 40 from the pilot motor 34 and the drive side pulley device 6
The rotational axes of the input shaft 1 or the operating threaded rod 25 are parallel to each other, and the distance between the two axes is fixed, but this distance can be changed by adjusting the bolt 39 and nut 37 of the bolt support 38. can be adjusted. Therefore, the transmission member 60 can be removed from the sprocket 26 only by operating this nut 37, and thereby the belt 4 can be removed from the drive pulley device 6.

As described above, in the transmission drive control device according to the configuration of the present invention, the transmission member can be attached and detached by simply removing the cover and making adjustments such as tightening the four nuts on the slide support plate. This is extremely easy to do, and the motor can be moved without requiring any manipulation of the terminal group on the terminal board, so it is effective for belt replacement maintenance. Moreover, at the same time, this support plate can be structured to also serve as a terminal plate, so that multiple maintenance operations can be performed by simply attaching and detaching a single cover. In addition, maintenance work for belt replacement, especially in hazardous areas, requires the traditional method of removing the entire transmission from the load such as a blower, or disassembling the variable diameter pulley device itself to replace the belt. This completely eliminates belt replacement and enables efficient belt replacement with simple external operations, which greatly contributes to reducing operating costs.

[Brief description of the drawings]

1 and 2 show longitudinal and transverse cross-sectional views, respectively, of a belt transmission in which a drive control device according to an embodiment of the present invention is used. Also, the third
Figures a and b respectively show the drive control device and the adjustment device of the pulley device connected thereto, and Figs. 4 and 5 respectively show a schematic cross-sectional view and a schematic front view of the drive control device. It shows. In the figure, 10...belt transmission, 6 and 7...
...Drive side and driven side pulley devices, 8 and 9...
...Pulley, 30...Pilot motor control device,
26, 42... Sprocket.

Claims (1)

[Scope of utility model registration request] In a transmission drive control device, a driving side variable diameter pulley device and a driven side variable diameter pulley device are installed in a housing, and control power is supplied to the driving side variable diameter pulley device from an outer wall of the housing. In order to variably control the pulley device, a pilot motor control device is installed in an opening formed in the side wall of the housing, and the pilot motor control device has a pilot motor on the indoor side of the housing, and a potentiometer and a terminal board on the outdoor side. What is claimed is: 1. A transmission drive control device, characterized in that said pilot motor control device is housed in a casing having drive circuit sections each comprising a drive circuit section and a cover that is removable from the outside.