JPS6235968Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a transmission device that uses a variable diameter speed change pulley to change the speed of an input shaft, an intermediate shaft, and an output shaft. This invention relates to a self-adjusting continuously variable transmission that has been structurally improved to speed up and simplify the process.

[Prior art]

Many transmissions are used in many fields such as machine tools, blowers, and cooling towers. For example, the special public official court in 1977-
No. 42750 or Utility Model Application No. 48-5183 shows a variable transmission with a two-stage belt. In this conventional example, a speed change pulley and a fixed pulley are installed on the input shaft and the intermediate shaft, as well as on the intermediate shaft and the output shaft, and the speed is changed by moving the intermediate shaft.

〔problem〕

However, a major problem arises when the conventional transmission mechanism is used as part of an all-electronic automatic control system.

For example, when applied to industrial plants and air conditioning equipment that use a large number of blowers, etc., remote control from a central control room is often required, and automatic control of speed changes is essential. Despite this, when a belt breakage accident occurs, it is required to repair and restore it within a short period of time, but in reality, in the conventional example described above, there is no need to remove bearings or disassemble pulleys, which takes a lot of time. It required a lot of effort. Furthermore, it has been extremely difficult to fully automate such conventional transmissions.

In particular, since conventional transmissions are manually controlled, the frequency of gear shifting is low. On the other hand, automation has the drawback that the operator's monitoring is extremely reduced, and the belt often repeats high speed and deceleration operations without noticing, resulting in frequent breakage of the belt within a short period of time.

〔the purpose〕

This invention provides an improved self-adjusting continuously variable transmission that fully automates a two-stage transmission type transmission and speeds up and simplifies maintenance work such as belt replacement that occurs with this automation. The purpose is to

[Technical means to solve problems]

In this invention, a first belt transmitter is installed between the input shaft and the intermediate shaft, and a second belt transmitter is installed between the intermediate shaft and the output shaft to form a two-stage transmission with the input and output shafts coaxial. and a continuously variable transmission that is housed in a single housing consisting of a lid and performs speed change control with a variable diameter speed change pulley,
An electromechanical transducer including a reversible servo motor that is mechanically coupled to the speed change pulley to control the contact radius of the speed change pulley is installed on the side wall surface of the main body of the housing. In order to make the two belts replaceable, only the middle part of the intermediate shaft is slidably supported, and the pulleys are installed around the intermediate shaft. an opening having a size that allows the intermediate shaft to be removed from the main body in a state where the intermediate shaft is in a state in which the two-stage transmission type transmission is opened by a plane parallel to the intermediate shaft; It is equipped with an electronic transmission controller that is connected to a mechanical converter and remotely controls the transmission ratio.

[Effect]

Utilizing the large openings, each of the upper and lower belts is attached to the free end of the rotating shaft so that the front of each pulley is open, making belt replacement and maintenance easy.

Additionally, since the opening is large enough to allow the pulley to be removed from the main body while the pulley remains attached to the intermediate shaft, maintenance work such as belt replacement, pulley replacement, and bearing replacement is significantly streamlined.

〔Example〕

FIGS. 1 and 2 respectively show a longitudinal cross-sectional view and a cross-sectional view of a continuously variable transmission of an embodiment of the apparatus. In FIG. 1, 1 is a main body, 2 is an upper lid attached to the upper surface of the main body 1, and 3 is a side wall of the main body 1. Further, a support base 5 is attached to the lower surface portion 6 of the main body 1. An opening 9 is open on the right side of the main body 1, and a maintenance cover 4 is attached thereto. The upper lid 2 is equipped with an input shaft 10 via a bearing 13, and a fixed pulley 11 is attached to the chrysanthemum seat 14 at the tip of the input shaft 10.
It is fixed by. 7 is an upper belt. Furthermore, 20 is an intermediate shaft, the center of which is connected to the sliding frame 3.
Upper and lower bearings 31 and 32 supported inside the
It is rotatably supported by the sliding frame 30, and has a shape that projects upward and downward from the sliding frame 30. A variable speed pulley 22 consisting of fixed and movable disks 22a and 22b is installed at the upper end of the intermediate shaft 20. The configuration of this variable pulley 22 is already well known, so a detailed explanation will be omitted. Fixed disk 22
a is fixed to the intermediate shaft 20 and rotates as a unit, while the movable disc 22b is configured to fit into several vertical grooves provided in the intermediate shaft 20 and slide in the axial direction of the intermediate shaft 20. The movable disc 22b and fixed disc 22a transmit the power transmitted through the belt 7 to the intermediate shaft 20, and together with the pulley 11 constitute a first transmitter. Furthermore, a fixed pulley 21 having the same diameter as the fixed pulley 11 is fixedly attached to the lower end of the intermediate shaft 20 by a chrysanthemum seat 28. On the other hand, on the left side of the sliding frame 30, a pivot arm 33 for pivotally supporting the control rod 60 is formed integrally with the sliding frame 30 in the shape shown in FIG. Further, on the side surface of the sliding frame 30, as shown in FIG.
stands out. On the other hand, 35 is a U-shaped guide base, which includes front and rear side arm portions 35a and 35.
A sliding protruding side 34a of the sliding frame 30 is provided on the inner wall surface of b.
Sliding grooves 36a and 36b are formed to fit into the sliding grooves 36a and 34b, and the sliding frame 30 slides along the sliding grooves 36. Next, 40 is an output shaft, which is rotatably supported by upper and lower bearings 51 and 52 mounted on a support base 5 attached to the lower surface 6 of the main body 1. A speed change pulley 42 having approximately the same diameter as the speed change pulley 22 is attached to one end of this output shaft 40 . However, speed change pulley 2
2, the fixed disk 42a is arranged below and the movable disk 42b is arranged above. Others,
It has substantially the same function and structure as the speed change pulley 22. 8 is a lower belt, which has approximately the same circumference and inner diameter as the upper belt. As is clear from FIG. 2, since the input shaft 10 and the output shaft 40 are installed on a concentric axis,
By sliding the intermediate shaft 20 near and far from 40, the rate of increase/deceleration of power can be freely changed.

Next, the control rod 60 is rotatably supported at one end within the through hole 37 of the pivot arm 33, and has a scale 66 at the other end.
5 and a screw groove 64, and furthermore, the central part 63
is formed to have a constant length and a hexagonal cross-sectional shape. This screw groove 64 is further screwed into a protruding screw hole 67 provided in the side wall portion 3 of the main body 1, and the forward and backward movement of the connecting means or control rod 60 is indicated by a scale 6.
5 so that it can be monitored through a transparent cover. On the other hand, a gear mechanism is connected to the hexagonal cross section 63. The main gear 71 has a hexagonal hole in the center, into which a control rod 60 serving as a connecting means is inserted. Further, a drive gear 72 and a detection gear 77 are engaged with the large gear 71, respectively. Also,
The drive gear 72 is fixed to a shaft 73 of a reversible servo-controlled motor 75 and supported on a bearing 76 . Furthermore, the detection gear 77 is connected to the control rod 6.
This is to detect the position of 0 and to obtain the input signal of the operating device 80. This gear 77
is also fixed to a detection rod 81 supported by the support body 76. The operating device 80 also has a gear reduction mechanism 82 therein, and further includes a control circuit 83 such as a potentiometer and an indicator 84. This indicator 84 may be omitted.

In addition, gears 71, 72, 77 and a control rod 60, which transmit the rotational power of the reversible servo motor 75 for controlling the speed change described above, and an operating device 80 as a whole convert electrical signals into mechanical signals. The transmission is controlled by the action of this mechanical signal, that is, by the operation of the control rod 60, and constitutes one electromechanical converter.

Next, FIG. 3 shows an example of a servo control circuit of an adjusting device for controlling the continuously variable transmission shown in FIGS. 1 and 2. In FIG. A in the figure is a bridge circuit, which basically consists of a setting potentiometer _r0 and a feedback potentiometer _r4 .
The manual switch SW ₁ is a switch that is opened when replacing the belt and is closed during normal operation.
B is an amplifier circuit composed of an amplifier _Q1 and a positive feedback circuit. C is a forbidden band setting circuit for preventing hunting of the servo motor 75, and is composed of diode bridges d ₁ , d ₂ , d ₃ and d ₄ and resistors R ₃ and R ₄ . D is a relay drive circuit, and E is a power supply circuit. Furthermore, F is a servo motor circuit.

Therefore, the operation of the embodiment apparatus shown in FIGS. 1 and 2 together with the control circuit shown in FIG. 3 will be described. First, power from a prime mover (not shown) such as an electric motor or an internal combustion engine is input to the input shaft 10, and along with this, the power is transmitted to the fixed pulley 11, the variable pulley 22, the fixed pulley 21, and then the variable pulley 42. is transmitted. At this time, it is assumed that the servo control circuit is balanced. Now, if you try to increase the setting potentiometer r ₀ to obtain a larger output shaft rotation speed,
The negative input of amplifier Q ₁ increases compared to the positive input,
Therefore, when the voltage increases to a certain extent, the amplifier output drops to a negative voltage -V _H , transistor Q ₃ becomes conductive, and relay 2k is energized. Then, the relay contact 2k1 of the servo motor circuit E closes, and the motor winding
It rotates when excited by W ₂ . In this rotation direction, the control rod 60 is rotated in a forward direction through the gear mechanisms 71 and 72, and the intermediate shaft 20 is moved away from the input/output shafts 10 and 40. Therefore, the deceleration rate of the transmission decreases, and the output shaft 40 rotates at a high rotation speed. On the other hand, this servo motor 7
5 is monitored by a detection gear 77,
As shown in Fig. 3, it is connected via the feedback potentiometer _R4 and the wiper P.
The wiper moves and the amplifier input again increases until the positive input increases and becomes approximately equal to the negative input.
The output of Q ₁ rises to the common bevel, transistors Q ₂ and Q ₃ become non-conductive, and the servo motor 75 stops. Conversely, when lowering the rotational speed, it is also possible to lower the rotational speed by performing the same operation in reverse as described above.

[Other Examples]

Although the present transmission has been explained above as a servo-based automatic balancing instrument, the continuously variable transmission of the present invention can also be used as a controller for constant value control.
For example, it is also possible to detect state quantities such as temperature, humidity, flow rate, etc. using a controller and automatically control the state values of the process to be constant values. It can also be applied to program control that controls to a predetermined program value without detecting the state value, and devices that are compatible with each of these control forms are well known, and can be used as part of the control circuit. Those skilled in the art can easily make changes by changing the parts. In addition, above we have described the case of manual setting of the setting volume r ₀ , but this can be used as a manual servo setting device by arbitrarily changing r ₀ by a signal that changes depending on the load condition. It is also possible.

In the embodiments shown in FIG. 1, the most preferred example is shown in which the solid pulleys 11 and 21, the variable pulleys 22 and 42, and the belts 7 and 8 have the same diameter, but these are not necessarily mutually exclusive. It is not limited to having the same diameter, but it can be changed depending on the conditions.

[Effect of idea]

According to the present invention, the belt can be easily replaced by simply moving the intermediate shaft in the direction of the input/output axis with the pulley still attached to the housing consisting of the main body and the lid. There are advantages that can be achieved without additional disassembly work. Therefore, maintenance can be speeded up and simplified.

Furthermore, since the entire intermediate shaft can be attached and detached from the housing body with the pulley assembled, work efficiency can be improved not only when replacing the belt but also other parts. Therefore, it is useful for promoting automation of transmissions. In particular, according to the configuration of this invention, a continuously variable transmission and a regulating device are combined, and furthermore, the continuously variable transmission organically connects the first transmission, the second transmission, and the electromechanical converter. Because they are combined and installed in a single housing, they can be moved and transported as one unit, even when installed outdoors like a blower or in a narrow and dangerous place such as inside a duct. This speed change control can be controlled in an arbitrary manner simply by connecting to an adjusting device, and the industrial value is extremely large.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a continuously variable transmission that is part of an apparatus according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the continuously variable transmission that is a part of the same apparatus. FIG. 3 further shows a circuit connection diagram of a servo adjustment device which is a part of the device of the same embodiment. 1... Main body, 7 and 8... Upper and lower belts, 10... Input shaft, 20... Intermediate sliding shaft, 3
0... Sliding frame, 35... Guide base, 40... Output shaft, 75... Servo motor, 80... Operating device,
90... Servo adjustment device.

Claims (1)

[Scope of utility model claims] A first belt transmitter is installed between the input shaft and the intermediate shaft, and a second belt transmitter is installed between the intermediate shaft and the output shaft, and a two-stage transmission with the input and output shafts coaxial is installed from the main body and the lid. In a continuously variable transmission device that is housed in a single housing and performs speed change control by interposing a variable diameter speed change pulley, a main body side wall surface of the housing is mechanically connected to the speed change pulley and makes contact with the speed change pulley. An electromechanical transducer including a reversible servo motor to control the radius is installed, while the housing includes variable speed and constant speed pulleys with both free ends open to allow conversion of the first and second belts. attached to the intermediate shaft to slidably support only the central portion of the intermediate shaft, and furthermore, an opening is provided around the intermediate shaft of a size that allows the intermediate shaft to be removed from the main body with the pulley attached. The opening further includes a two-stage transmission type transmission opened by a plane parallel to the intermediate axis, and an electronic transmission controller connected to the electromechanical converter to remotely control the transmission ratio. Automatically adjustable continuously variable transmission.