JP2987276B2 - Belt-type continuously variable transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt type continuously variable transmission.

[0002]

2. Description of the Related Art As a belt-type continuously variable transmission mechanism, as disclosed in, for example, Japanese Utility Model Application Laid-Open No. 55129/1989, an output shaft of an engine provided at a front portion of a traveling body in a working machine is directly connected to an output shaft of an engine. Are connected to each other.

[0003]

In the above configuration, since the belt-type continuously variable transmission mechanism is exposed, it is possible that muddy water or the like adheres to the belt-type continuously variable transmission mechanism. If muddy water or the like adheres to the belt-type continuously variable transmission mechanism in this manner, there is a risk of slipping on the contact surface between the transmission belt and the driving and driven pulleys, and abrasion of the contact surface. There is a possibility that the durability of the mechanism is reduced. An object of the present invention is to prevent the durability of a belt-type continuously variable transmission mechanism from decreasing.

[0004]

A feature of the present invention resides in a belt-type continuously variable transmission configured as follows. A belt-type continuously variable transmission mechanism including a driving pulley and a driven pulley is covered with a case, and air is sucked into the case to guide the air to the vicinity of one outer periphery of the driving and driven pulleys, and air in the case. An exhaust port for discharging air from the vicinity of the other outer periphery of the drive and driven pulleys, and a drafting means for sucking air from the intake port into the case and discharging the air from the exhaust port. With respect to the support shaft of the above, the drive and driven pulley is disposed on the opposite side to the other support shaft and at a position away from an imaginary line extending over the support shaft of both the drive and driven pulley, and the exhaust port is driven. And the other support shaft of the driven pulley,
The drive and driven pulleys are arranged on the opposite side of one of the support shafts and away from an imaginary line extending over both the drive and driven pulley support shafts.

[0005]

[Action]

[I] According to the feature of claim 1, since the belt-type continuously variable transmission mechanism is covered by the case, it is possible to prevent the muddy water from adhering to the belt-type continuously variable transmission mechanism by the case. Accordingly, noise generated from the belt-type continuously variable transmission mechanism can also be suppressed.

[II] When the belt-type continuously variable transmission mechanism is covered by the case as described in the above item [I], a structure for discharging heat generated by the belt-type continuously variable transmission mechanism from the case is required. According to the first aspect of the present invention, the air conditioner includes the intake port, the exhaust port, and the blast means, and the blast means draws air from the intake port into the case and discharges the air from the exhaust port together with heat.

[III] According to the feature of claim 1, the intake port is arranged so that the sucked air is guided near one outer peripheral portion of the drive and driven pulley, and one of the drive and driven pulley is provided. The intake port is arranged on the opposite side of the drive shaft and the driven pulley from the other support shaft with respect to the support shaft. Further, an exhaust port is disposed so as to discharge air from around the other outer peripheral portion of the drive and driven pulley, and the other support shaft of the drive and driven pulley is opposite to the one support shaft of the drive and driven pulley. An exhaust port is arranged on the side.

Accordingly, the intake port and the exhaust port are located opposite to each other with the support shafts of both the driving and driven pulleys interposed therebetween, and the distance between the intake port and the exhaust port becomes sufficiently large. . As a result, the air sucked in from the intake port sufficiently exchanges heat with one of the driving and driven pulleys, and then sufficiently exchanges heat with the other of the driving and driven pulleys, reaches the exhaust port and is discharged. As a result, the air sucked from the intake port hardly exchanges heat with the drive and driven pulleys, and reaches the exhaust port immediately and is less likely to be discharged.

[IV] According to the feature of claim 1, the intake port and the exhaust port are arranged at positions away from an imaginary line extending over the support shafts of both the driving and driven pulleys. Four of the supporting shafts of both the driving and driven pulleys are in a straight line (virtual line)
It is in a state where it does not line up.

In this case, when the four support shafts of both the intake port and the exhaust port, and the drive and driven pulleys are aligned in a straight line (virtual line), the drive is positioned at the center of the flow of air from the intake port to the exhaust port. When both the support shafts of the driven pulley and the driven pulley are located, the support shafts of both the drive and the driven pulley may have a large resistance to the flow of air from the intake port to the exhaust port.

On the other hand, according to the features of the first aspect, as described above, the four support shafts of the intake port and the exhaust port, and both the drive and driven pulleys are not aligned in a straight line (virtual line). In this state, at least one support shaft of the driving and driven pulleys is located at a position away from the center of the air flow from the intake port to the exhaust port. Therefore, according to the features of claim 1, the support shafts of both the driving and driven pulleys do not have a large resistance to the flow of air from the intake port to the exhaust port, and the air flows from the intake port to the exhaust port. Flows smoothly.

[0012]

According to the first aspect of the present invention, by providing a case for covering the belt-type continuously variable transmission, it is possible to prevent muddy water and the like from adhering to the belt-type continuously variable transmission.
The noise generated from the belt-type continuously variable transmission mechanism can be suppressed, the comfort for the operator can be improved, and the durability of the belt-type continuously variable transmission mechanism can be improved.

According to the first aspect of the present invention, when the belt-type continuously variable transmission mechanism is covered with the case, the sucked air is guided near the outer periphery of one of the driving and driven pulleys, and the other of the driving and driven pulleys. The intake port and the exhaust port are arranged so that the air is discharged from the vicinity of the outer peripheral portion, and the intake port and the exhaust port are located on the opposite sides with respect to both the support shafts of the drive and driven pulleys. By configuring
The distance between the intake and exhaust ports can be made sufficiently large, and the air taken in from the intake port exchanges sufficient heat, and the heat generated by the belt-type continuously variable transmission can be efficiently removed from the case. As a result, the belt-type continuously variable transmission mechanism can be prevented from lowering in durability due to heat.

According to the feature of the first aspect, the four support shafts of both the intake and exhaust ports, the drive and driven pulleys are not aligned (virtual line), and the center of the flow of air from the intake port to the exhaust port. By arranging at least one of the drive shafts of the drive and driven pulleys at a position away from the support shaft, both of the drive shafts of the drive and driven pulleys are supported with respect to the flow of air from the intake port to the exhaust port. There is no large resistance, the air flows smoothly from the intake port to the exhaust port, and the heat generated by the belt-type continuously variable transmission mechanism can be efficiently discharged from the case. It was possible to prevent the durability of the belt-type continuously variable transmission mechanism from decreasing.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 shows a riding type rice transplanter as an example of a paddy field working vehicle. In the riding type rice transplanter, a seedling planting device 3 is connected to a rear portion of a wheel-type traveling machine 1 via a link mechanism 2 which can swing up and down so as to be able to ascend and descend, and an engine 4 provided at a front portion of the traveling machine 1. Is transmitted to a transmission 5 provided at a rear portion of the traveling body 1 and the transmission 5
From the rear wheel 6 and the seedling planting device 3.

As shown in FIGS. 1, 2, and 4, a transmission 5 is disposed between a pair of left and right forward-facing body frames 7, and a belt-type continuously variable transmission mechanism 8 is provided at a position where transmission of the transmission 5 is excellent. In addition, a gear transmission mechanism 9 is provided at a position below the transmission. The belt-type continuously variable transmission mechanism 8 is covered with an outer case 10 of the transmission 5, and an input shaft 11 of the outer case 10 of the transmission 5 is provided with a draft fan 12 that rotates integrally with the input shaft 11.
Is provided.

As shown in FIG. 1 and FIG.
Accordingly, air is guided from the guide path 13 having a tapered passage in a fan shroud shape to the case 10A that covers the belt-type continuously variable transmission mechanism 8. The guide path 13 is arranged so as to guide the air near the outer peripheral portion of the drive pulley 8a in the belt-type continuously variable transmission mechanism 8, and the support shaft 8c of the driven pulley 8b and the support shaft 8d of the driven pulley 8b. Are arranged on opposite sides.

As shown in FIGS. 1 and 2, the case 10A
An exhaust port 14 for exhausting air from is provided. The exhaust port 14 is provided with a valve element capable of exhausting and preventing dust and the like from entering the case 10A. The exhaust port 14 is arranged to discharge the air in the case 10A from the vicinity of the outer peripheral portion of the driven pulley 8b in the belt-type continuously variable transmission mechanism 8, and supports the driving pulley 8a with respect to the support shaft 8d of the driven pulley 8b. It is arranged so as to be located on the opposite side to the shaft 8c. In this case, the driving and driven pulleys 8a,
The guide path 13 and the exhaust port 14 are arranged at positions away from the imaginary line extending over both the support shafts 8c and 8d of 8b.
With the above configuration, air is sucked into the case 10A through the guide path 13 by the draft fan 12, and heat generated by the belt-type continuously variable transmission mechanism 8 and the like is discharged from the exhaust port 14, whereby the case 10A There is no heat.

As shown in FIGS. 1 and 3, an intermediate shaft 9a of a gear transmission mechanism 9 in the transmission 5 extends outward from the outer case 10, and an output bevel gear 15 is provided at an end of the intermediate shaft 9a. The power take-out bevel gear 16 is engaged with the output bevel gear 15. The power take-off bevel gear 16 is supported by a rotating case 17, and the power take-off shaft 1 meshes with the power take-off bevel gear 16.
8 extends outward from the rotating case 17. The rotation case 17 is configured to be freely changeable in posture so as to swing around the axis of the intermediate shaft 9a along the lateral direction of the machine body. Accordingly, when the work is performed by mounting a control device, a car wash pump, or the like on the traveling machine body 1 in addition to the planting operation, the power take-out shaft 1 can be taken out according to the installation state of the control device or the like.
8 posture can be changed.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view showing a belt-type continuously variable transmission mechanism.

FIG. 2 is a longitudinal sectional side view showing a belt-type continuously variable transmission mechanism.

FIG. 3 is a side view of the vicinity of a power take-off shaft in the transmission.

FIG. 4 is an overall side view of a riding rice transplanter.

[Explanation of symbols]

 Reference Signs List 8 belt-type continuously variable transmission mechanism 8a drive pulley 8b driven pulley 8c, 8d support shaft 10A case 12 drafting means 13 intake port 14 exhaust port

Claims (1)

(57) [Claims] 1. A driving pulley (8a) and a driven pulley
(8b) A belt-type continuously variable transmission mechanism comprising:
(8), covered with a case (10A), the drive and slave to suck in the air casing (10A)
Moving pulley (8a), while the outer peripheral portion near the guide to the intake port to the the (8b) and (13), the air the drive and driven pulleys of the case (10A)
An exhaust port (14) for discharging air from the vicinity of the other outer periphery of (8a) and (8b) ; air is sucked into the case (10A) from the air inlet (13) and discharged from the exhaust port (14). together and a Okoshifu means (12) to said inlet (13), said drive and driven pulley (8
a) and (8b) with respect to one support shaft (8c).
The other support of the driving and driven pulleys (8a) and (8b)
On the side opposite to the axis (8d), and
(8a) and (8b) both support shafts (8c), (8
d), and the exhaust port (14) is connected to the drive and driven pulley (8).
a) and (8b) with respect to the other support shaft (8d).
Supporting one of the driving and driven pulleys (8a) and (8b)
On the side opposite to the shaft (8c), and
(8a) and (8b) both support shafts (8c), (8
a belt positioned away from the imaginary line over d)
Type continuously variable transmission mechanism.