JPS6227738Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a drive control device for variably controlling the gear ratio of a variable diameter belt transmission. This invention relates to a transmission drive control device that can withstand use even under adverse environments such as.

[Prior art]

Conventionally, in order to control the transmission ratio of a belt transmission using a variable diameter pulley device, an operating handle is disposed on the free end side of the pulley device, and this operating handle protrudes from the housing to allow manual operation. The speed change was controlled by .

In addition, automatic control of this type of belt transmission has also been practiced. In this case, the belt transmission itself is housed in a substantially flat housing, but the drive control device that controls the gear ratio is also guided out of the housing by connecting the sliding part of the variable diameter pulley device. A drive control device formed separately from the housing is attached to the housing, and the output means for the control rotational force of the drive control device and the connecting body of the pulley sliding portion are connected to each other as a transmission body exposed outside the housing. By connecting the two, the gear ratio was controlled.

〔problem〕

However, if a belt transmission equipped with this type of drive control device is installed outdoors, it will be protected from direct sunlight, rainwater,
When used in an atmosphere where the belt transmission is directly exposed to water vapor or the like, not only the belt transmission but also the drive control device that controls the gear ratio naturally requires airtightness. Despite this, conventionally, the belt transmission and the drive control device are each housed in separate housings, so the connecting portion between the two is exposed, or there is no way to further close this exposed portion. A separate cover must be provided.

However, when such a belt transmission is operated in a connected manner for a long period of time in an environment with constant humidity of 100%, such as in a cooling tower blower, the connecting portion between the transmission and the drive control device must be There was a problem in that rainwater easily entered the tank, and it became unusable in a short period of time due to corrosion, rusting, etc.

For this reason, automatic control of belt transmissions is
Traditionally, it has been used under special conditions such as inside a factory, but it has never been used outdoors where it is directly exposed to rainwater and sunlight.

〔the purpose〕

This invention integrates the parts that make up the drive control device for automatically controlling the gear ratio of the belt transmission by arranging them in a special way.
An object of the present invention is to provide a drive control device for a belt transmission that can be installed outdoors by arranging the integrally assembled drive control device on the side wall of the housing so as to be embedded in the interior of the belt transmission housing. It is said that

[Technical means to solve problems]

That is, the rotary shaft of the variable diameter pulley device, the pilot geared motor shaft that provides control power to the sliding part via a first power transmitter, and the pilot geared motor shaft that supplies control power to the potentiometer via a second power transmitter. adjustment shafts for guiding rotational force are arranged parallel to each other, and the pilot motor, the potentiometer, the second power transmitter, and the adjustment shaft are integrally assembled to the frame. It is installed on the side wall so as to be more embedded in the room.

[Effect]

According to this configuration, the drive control device for the belt transmission can be substantially housed within the housing chamber, and mechanisms such as mechanical drive parts and rotating parts can be almost embedded or semi-embedded. As a result, it is possible to almost completely block the intrusion of rainwater, water vapor, dust, etc. not only into the belt transmission but also into the drive control device.

〔Example〕

FIG. 1 is a longitudinal sectional view of a belt transmission to which an embodiment of the invention is applied.

In the figure, 1 is an input rotating shaft that is connected to a power source such as an electric motor, 2 is an intermediate rotating shaft, and 3 is an output rotating shaft that is connected to a load such as a blower fan. Therefore, it is installed inside a sealed housing 10. Further, on the input shaft 1, there is a driving side variable diameter pulley device 6 consisting of fixed and sliding pulleys 6a and 6b, and on one end of the intermediate shaft 2, there is a driven side variable diameter pulley device 6 consisting of similar fixed and sliding pulleys 7a and 7b. There is a diameter pulley device 7, and a speed change belt 4 is wound between both pulley devices 6 and 7. On the other hand, a large diameter pulley 8 is attached to the output shaft 3.
A small-diameter pulley 9 is attached to the other end of the intermediate shaft 2, and three V-belts 5 are wound around between both pulleys. The intermediate shaft 2 is supported by a fixed holder 13. The fixed holding body 13 has three fixed arms 13a,
13b and 13c, each of which is erected from the frame 11;
4c and fixed by stud bolts and nuts embedded therein. Further, this holding body 13 has bolts 16a, 16b and 1
7, the arc wall 15 of the protrusion pieces 14d and 14e
a and 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 variable diameter pulley device 6, an operating threaded rod 25 is disposed between both pulleys via a bearing, and a sprocket 26 is installed at the protruding open end of the operating threaded rod 25. As the threaded rod 25 rotates, the guide 27 moves up and down, and the sliding pulley also moves up and down accordingly.

2 is a cross-sectional view of the belt transmission showing sprocket 26 and transmission member or chain 28 connected to pilot motor control or drive control 30. Referring to FIG. Based on the control of the pilot motor control device, that is, the drive control device 30, the belt 4 shifts between the drive side and driven side pulley devices 6, 7 to change the gear ratio. 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 move the holder 13 to the pillars 14a, 14b,
Loosen the nut fixed on 14c and remove the intermediate shaft 2.
Reduce the distance between the input and output shafts 1 and 3 and remove the belts 4 and 5. However, in this case, regarding the belt 4, as is clear from Figures 1 and 2,
Because it is necessary to straddle the transmission member 28, this transmission member 2
8 must be removed from sprocket 26.

Next, the configuration of the pilot motor control device 30 will be explained with reference to FIGS. 3 to 5.

3a shows a block diagram of the pilot motor control device, that is, the drive control device 30 installed on the housing side wall of the frame 11, and FIG. 3b shows a block diagram of the sliding part of the variable diameter pulley device 6. There is.
A casing 31 is screwed to the outer wall of the frame 11, and a cover 32 is provided on the front surface of the casing 31 to seal rainwater, water vapor, etc. from electrical components and mechanical components arranged inside. . Inside the chamber is a holding slide frame 33 with a T-shaped cross section.
A combination of a pilot motor 34 and a gear head 35 is installed on the horizontal surface portion 33a of the slide frame 33. Electrical and mechanical parts are arranged on the back side of the vertical surface 33b, and it is mainly used as an operation panel for control.
A lead wire (not shown) is drawn out and introduced through the wiring through hole 51 of the casing 31 .

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 frame 33 is fixed by bolts 39. A shaft hole 33 is provided in the horizontal surface 33a of the slide frame 33.
c, and a through hole 33d for passing a gear through the vertical surface 33b thereof. Shaft hole 33
An output shaft 40 is protruded from the gear head 35 at c, and a gear 41a and a sprocket 42 are connected thereto, and a bearing 4 is attached to the tip of the output shaft 40.
4, the bearing tool 43 is attached to the bolt support portions 38b, 3
It is fastened with 8d bolts. The rotational power of the gear 41a is further transmitted from the gears 41e and 41f via the adjustment shaft 45 via the gears 41b, 41c, and 41d to the potentiometer 46 that electrically detects the magnitude of the gear ratio, where the angle is determined. This translates into a rotation range of approximately 270 degrees. The adjustment shaft 45 is threaded and further has two cams 47a,
47b is provided, and as the shaft 45 rotates, the cams 47a and 47b rotate. This cam 47a,
Switches 48a and 48b for high limit and low limit are controlled to open and close, respectively, in accordance with the rotation of switch 47b. Reference numeral 50 denotes a terminal plate, from which the energizing power of the pilot motor 34 and the signal line of the potentiometer 46 are taken in and out through a wiring through hole 51. 52 is a capacitor for controlling the power phase of the pilot motor 34.

FIG. 3b shows a sliding portion which is provided integrally with the driving 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 60 shown in FIG.
controlled via. In this case, the output shaft 40 from the pilot motor 34 and the variable diameter 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 by adjusting the bolt 39 and nut 37 of the bolt support 38, this distance between the axes can be changed. 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.

On the other hand, the drive control device 30 that controls the gear ratio of the belt transmission 10 is composed of an electrical control section and a mechanical control section, which are arranged on the left and right sides with the frame 33 as a boundary. Furthermore, the center of the electrical control section is the adjustment shaft 45 that controls the drive of both the potentiometer 46 and the limit switch 47, and the center of the mechanical control section is the geared motor 34, It is 35. In this embodiment, the rotation axes of the adjustment shaft 45 and the geared motors 34, 35 are both arranged parallel to the rotation axes of the pulley devices 6, 7. This means that the adjustment shaft 45 has gears 41a to 4 centered around the geared motors 34 and 35.
1d, and the second power transmitter 60 of the pulley device 6 can be centrally arranged at the end of the rotating shaft, and the drive control device 30 is located on the frame. This shows that it is possible to integrate centrally around 33. Furthermore, there are many structural advantages in that the electrical control section is located on the outdoor side of the housing and the mechanical control section is located on the indoor side. For example, when performing maintenance and adjustment work on the rotation speed, simply opening the cover 32 reveals the electric control section as shown in FIG. 5, making the work easier. Further, the heat generated from the motor 34 has the advantage that it can also be used as the heat radiation blower 20 of the belt transmission, so that it does not generate heat.

[Other Examples]

In the above-described embodiment, the frame 33 is made into a sliding type and the reach body 60 is removed when replacing the belt, but the belt may be replaced by other methods.
It is also obvious to those skilled in the art that the sprocket 26 can be configured to be detachable from the threaded rod 25, and that when the maintenance cover 12 is opened, the sprocket 26 and the transmission body 28 can be removed from this opening.

In addition, in FIGS. 1 and 2, an example of a two-stage transmission including a belt transmission and a speed reducer was explained, but the height of the housing 11 is also thinner and flatter in the case of a single-stage transmission with only a belt transmission. It is obvious that the device of this invention can be easily applied.

[Effect of idea]

According to this invention, since the axes of the main parts that make up the drive control device that controls the gear ratio are parallel to each other, it is easy to integrate them when assembled to the frame, and moreover, the gear can be changed while being assembled as one piece. It is possible to embed it indoors through the side wall of the machine housing. As a result, the entire belt transmission is exposed to rainwater, dust, and
Even if directly exposed to water vapor, etc., there will be no intrusion from rainwater, etc., and no rust will occur, allowing normal operation over a long period of time. This greatly expands the industrial fields to which the belt transmission can be applied compared to the past, and is of great industrial value.

In addition, since the drive control device is almost embedded or semi-embedded indoors, the heat generated from the pilot motor located indoors can be dissipated along with the frictional heat generated from the belt transmission, so the heat can be dissipated individually. There is no need to consider the means and the heat dissipation efficiency is also good.

Furthermore, since the drive control device is supported by the side wall of the housing, it is easy to place a maintenance cover on the part that protrudes to the outside, so just by opening and closing this maintenance cover, you can perform wiring work or maintenance adjustment work. It is possible to adopt a structure that makes it easy to do the following. Especially when automatically controlling electrically,
It has the advantage of speeding up and streamlining various types of work, and has great industrial value.

[Brief explanation of the drawing]

1 and 2 show longitudinal and transverse cross-sectional views, respectively, of a belt transmission in which a transmission drive control device according to an embodiment of the present invention is used. 3a and 3b respectively show the drive control device and the sliding part of the pulley device connected thereto, and FIGS. 4 and 5 show a schematic cross-sectional view of the drive control device and A schematic diagram of the front side is shown in each case. In the figure, 10...belt transmission, 6 and 7...
...Drive side and driven side pulley devices, 8 and 9...
...Pulley, 30...Transmission drive control device, 26,
42... Sprocket.

Claims (1)

[Scope of utility model registration request] A speed change belt is wound between variable diameter pulley devices attached to the drive side and driven side rotating shafts, respectively.
In a transmission drive control device for a belt transmission installed in a substantially flat housing, the rotating shaft of the variable diameter pulley device has a sliding portion for adjusting the interval between the fixed and sliding pulleys; The output shaft of the pilot geared motor that provides control power to the sliding part via the first power transmission device and the adjustment shaft that further introduces the rotational force of the pilot geared motor to the potentiometer via the second power transmission device are parallel to each other. The pilot geared motor, the potentiometer, the second power transmitter, and the adjustment shaft are mounted on the frame so that they are embedded in the room from the external side wall of the housing. A transmission drive control device characterized in that it is installed in.