JPS6347316Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a type of power transmission machine that incorporates two stages of belts in a single housing.

[Prior art]

Conventional two-stage power transmissions with two belts housed in a single closed housing are already known. One example is Utility Model Application Publication No. 17449/1983 proposed by the applicant. In this conventional example, belts are used to transmit power to both the first stage and the next stage, and the power is transmitted from the input shaft to the intermediate shaft by the first stage belt, and then from the intermediate shaft to the next stage belt. It transmits power to the output shaft.

[Problem that the invention attempts to solve]

However, in such a power transmission machine, as the belts in the first stage and the next stage elongate during operation, and the elongation rates differ from each other, it is necessary to keep all belts at the appropriate rotation speed and optimum tension. Difficult to maintain. In the conventional example of Utility Model Application Publication No. 56-17449 mentioned above, the tension adjustment method is to arrange the central axes of the input shaft, intermediate shaft, and output shaft at each vertex of a triangle, and to adjust the tension between the first and second stages. According to the elongation of each belt, only the position of the intermediate shaft is always freely movable within a certain range, and a predetermined belt tension is automatically ensured.

However, in this conventional example, it is essential that the axes of each rotary shaft be located at the vertices of the triangle, so there was a drawback that the single sealed housing had to be undesirably large. In particular, when a blower fan is installed on the output shaft of this type of transmitter and used as a blower, the cross-sectional area of the housing is large, resulting in a reduction in the blowing effect of the axial blower. Furthermore, the design of the blower was unsatisfactory because only the housing was unnecessarily large.

Furthermore, when a power transmission machine such as the one described above is used in a blower, etc., it is often installed in the airflow, so it is required to be small and lightweight and easy to maintain, but maintenance frequency is reduced. For the most part, I couldn't find anything that satisfied me.

[Means for securing problems]

This invention makes it possible to reduce the size of the frame and the overall product by pivoting the rotary power input shaft and output shaft to the frame so that their center lines are located almost in a straight line. On the other hand, the tension of the first stage belt is secured by fine adjustment of the intermediate shaft, and the tension of the next stage belt is secured by a tension adjustment member.

[Effect]

In such a configuration, the input shaft of the rotational power and the output shaft are located almost in a straight line, and the positional relationship is as if the two shafts were one rotating shaft. Since the frame body can be made smaller while ensuring the tension of the corrugated belt, when a blower fan is installed on the output shaft and used as a blower, there is an advantage that the blowing effect can be improved.

〔Example〕

Hereinafter, one embodiment of the present invention will be explained in order starting from FIG.

FIG. 1 is a schematic explanatory diagram of the power transmission machine of this embodiment. Transmission 1 and reducer 2 as shown in Figure 1
In the transmission 10 with the combination of 5 is lower than the desired rotation speed. This case can be solved by adjusting the distance between the input shaft 4 and the intermediate rotating shaft 7 using the hoisting device 9 connected to the intermediate shaft support 8.
However, in the compound transmission 10, at this time, the next stage, that is, the next stage speed change belt 6 of the second transmission reducer 2
Since the tension of the belt varies, there is a need for a compensator for the output rotational speed and belt tension that can be accommodated by simple manual operation and without any inconvenience in terms of the design of the housing.

FIG. 2 is a plan configuration diagram of the two-stage belt transmission machine 10 of FIG. 1. The housing 11 constitutes a sealed housing including a frame 12 and a lid 13. As shown in FIGS. An opening 16 is provided in the body 12 . This opening 16 is formed so that the support 8 that supports the intermediate rotating shaft 7 equipped with the first-stage pulley 1b and the second-stage pulley 2a can be assembled into and removed from the frame 12 as a whole. has been done. On the other hand, the support body 8 is fixed with bolts 18 to three supports 17 forming a first support body standing upright from the protrusion 12a of the frame body 12. The support body 8 is also connected to a bolt 20 passing through a second support body 19 which also stands upright, thereby forming a hoisting mechanism for positioning the support body 8 or the intermediate shaft 7.

Further, a third support 25 stands upright integrally with the frame 12 from the inner bottom 12a of the frame 12, and a fixing member 3 is attached to the upper surface 25a by a bolt 3.
5 is fixed. On the other hand, the inner bottom surface 1 of the frame body 12
From 2a onwards, a support column 31 is separately fixed upright, and a lever body 32 holding a tension pulley 33 is attached thereto.
is supported.

FIG. 3 is a block diagram showing this tension adjusting device in further detail. The lever body 32 has a shaft support part 32b in addition to the support part 32a,
A tension pulley 33 is held via a shaft 34. Further, the tip end portion 32c of the lever body 32 has an elongated slot 32d formed on its side surface, and is engaged with the tip tapered portion 36a of the bolt 36 described above.
Note that the bolt 36 may be a headless screw. The nut 38 is for fixing the bolt 36 after adjustment. Here, the fixing member 35, the bolt 36 and the nut 38 constitute an adjusting screw means for adjusting the bolt tension of the second transmission.

FIG. 4 is a perspective view showing the arrangement of three types of supports 17, 19, and 25, first, second, and third, which stand integrally upright from the inner bottom surface 12a of the frame 12 into the opening. The tips of these supports 17, 19, and 25 are all machined to the same height, and the peripheral edge 25b of the opening 16 can also be machined to the same height, so the machining process is significantly simplified. Moreover, there is an advantage that the entire structure including the tension adjustment device can be easily assembled into the housing.

In such a configuration, the belts 3 and 6 of the first-stage and next-stage transmitters 1 and 2 shown in FIG.
When both are stretched at the same time, the tension is adjusted by the following operation. That is, the intermediate shaft support 8 is adjusted by the hoisting belt 20, and the distance between the input (output) shafts 4, 5 and the intermediate shaft 7 is corrected. As a result, the first stage transmission 1 is adjusted to obtain a predetermined gear ratio. However, at this time, the belt 6 of the next stage reducer 2 also has irregular elongation, so the tension of this belt 6 is adjusted next, but at this time,
By winding up the once loosened belt 36 again, the pulley back pressure on the belt 6 is adjusted, and the adjustment position is locked by the nut 38, completing all adjustments. With this, the servo motor mechanism 4
0 and the control arm 41, the driving pulley 1a of the first stage transmission 1 can operate normally without error at the optimum speed ratio.

[Other Examples]

In this embodiment, an example in which a continuously variable transmission is used as the first stage transmission 1 has been described, but it goes without saying that a similar tension and rotational speed adjustment mechanism can be achieved by using a belt speed reducer with a constant gear ratio. stomach.

[Effect of idea]

As described above, according to the present invention, the input shaft and the output shaft of rotational power are pivoted to the frame so that the center lines of the two are located in a straight line, so that the two shafts are rotated as if they were one rotation. Since the two shafts and the intermediate shaft are no longer positioned at the vertices of a triangle, the frame body and the entire product can be made smaller. For this reason, when a blower fan is installed on the output shaft and used as a blower, the cross-sectional area of the frame can be reduced, which has the effect of improving the blowing effect. Moreover, since the frame body is provided with an opening through which the tension adjustment member, the fine adjustment member, and the fixing member are exposed and which is closed by the lid, the two belts can be easily connected by simply removing the lid. It is possible to appropriately compensate for the elongation of . Moreover, since the lid is sealed during operation, there is an advantage that a stable and accurate gear ratio or reduction ratio can be ensured without being affected by external conditions such as moisture.

Furthermore, during machining, the support stand or support body standing upright in the housing opening can be machined at one time, making it possible to achieve an extremely inexpensive construction and easy assembly work.

Furthermore, even when this transmitter is used under adverse conditions such as dust and moisture, the transmitter and tension adjustment part can all be housed within the housing, so there is no inconvenience, and the industrial value is extremely high. big.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a two-stage belt transmission machine to which the compensating device for a belt transmission machine of the present invention is applied, and FIG. 2 is an embodiment of the present invention applied to the two-stage belt transmission machine of FIG. FIG. 3 is a layout diagram of an example compensation device. Furthermore, FIG. 3 is a schematic perspective view of the compensation device of the same embodiment,
FIG. 4 is a structural perspective view showing details of a frame body to which the same embodiment device is applied. In the figure, 1...first stage (first) belt transmission machine, 2...
...Next stage (second) belt transmission, 4, 5, 7...Input shaft, output shaft, intermediate shaft, 11...Housing, 1
2... Frame, 13... Lid, 16... Opening, 2
5... Support body, 30... Tension adjustment device, 32...
Lever body, 36...bolt, 35...fixing tool.

Claims (1)

[Scope of utility model registration request] An input shaft 4 and an output shaft 5 for rotational power are pivotally supported on a frame 12 so that their center lines are located substantially in a straight line, and the rotation of the input shaft 4 is transmitted via the first speed change belt 3. , and an intermediate shaft support 8 on which an intermediate rotating shaft 7 which transmits the rotation to the output shaft 5 via the next stage transmission belt 6 is pivotally supported is placed between the input shaft 4 and the intermediate rotating shaft 7. The fixed member 18 is movable so that the distance between the axes can be finely adjusted.
A tension adjustment member 30 is provided on the frame 12 and is fixed to the frame body 12 through a tension adjustment member 30 for adjusting the tension of the center distance fine adjustment member 20 and the next stage transmission belt 6, and the tension adjustment member 30 and the fine adjustment member 20 and the fixing member 18 are exposed, and the frame body 12 is provided with an opening 16 which is closed by the lid body 13.