JP2987351B2 - 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 configured with a drive pulley and a driven pulley is covered with a case, and a imaginary line extending over both support shafts of the drive and driven pulleys. An intake port for inhaling air into the case, and an exhaust port for discharging air from the case, and a blast means for sucking air from the intake port into the case and discharging the air from the exhaust port, and an intake port for a virtual line. And, on the existence side and the opposite side of the exhaust port, the interval between the inner surface of the case on the existence side and the outer peripheral portion of the drive and driven pulley is smaller than the interval between the inner surface of the case on the opposite side and the outer peripheral portion of the drive and driven pulley. It is set to a big one.

[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.

In this case, according to the first aspect of the present invention, the intake port and the exhaust port are disposed in the case portion on one and the same side with respect to an imaginary line extending over the support shafts of both the driving and driven pulleys. Therefore, the air passage from the intake port to the exhaust port is in a state along the above-mentioned imaginary line, and the transmission belt wound around the driving and driven pulleys moves along the air path from the intake port to the exhaust port. It will be located.

As described above, when the air passage from the intake port to the exhaust port is along the imaginary line, the support shaft of the driving and driven pulley is positioned in the air path from the intake port to the exhaust port. Therefore, the air sucked into the case from the intake port by the blast means reaches the exhaust port without being disturbed by the support shafts of the driving and driven pulleys, and is discharged. As a result, the air in the case is efficiently replaced with fresh air, and the state in which high-temperature air stays in the case is reduced.

[III] According to the feature of claim 1, on the existence side and the opposite side of the intake port and the exhaust port with respect to the imaginary line extending over the support shaft of both the driving and driven pulleys, the inner surface of the case on the existence side and the driving and The distance between the outer peripheral portion of the driven pulley and the outer peripheral portion of the driving and driven pulley is set larger than the distance between the inner surface of the case and the outer peripheral portion of the driven and driven pulley on the opposite side. As a result, the passage of the air from the intake port to the exhaust port described in the above item [II] becomes large, so that the air drawn into the case from the intake port by the blast means reaches the exhaust port smoothly and is discharged. Is done.

[0010]

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 durability of the belt-type continuously variable transmission mechanism can be improved, and the comfort for the operator can be improved.

According to the first aspect of the present invention, when the belt-type continuously variable transmission is covered with the case, the intake port and the exhaust port are arranged on the same side of the case, and the air passage from the intake port to the exhaust port is provided. By configuring it to be big,
The air sucked into the case from the air inlet by the drafting means,
Since the air smoothly reaches the exhaust port and is discharged, the air in the case is efficiently replaced with new air, and the heat generated by the belt-type continuously variable transmission mechanism can be efficiently discharged from the case. Thus, it was possible to prevent the durability of the belt-type continuously variable transmission mechanism from decreasing due to heat.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 shows a riding rice transplanter as an example of a working machine. In this riding type rice transplanter, a seedling planting device 3 is connected to a rear portion of a wheel-type traveling machine 1 via a vertically swingable link mechanism 2 so as to be movable up and down, and an engine provided at a front portion of the traveling machine 1 is provided. 4 is transmitted to a transmission 5 provided at the rear 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 well performed. 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 vicinity of the drive pulley 8a in the case 10A that covers the belt-type continuously variable transmission mechanism 8. An exhaust port 14 for exhausting air from the case 10A is provided near the driven pulley 8b, and a valve body that is capable of exhausting air and prevents dust and the like from entering the case 10A is provided in the exhaust port 14.

As shown in FIG. 1, with respect to an imaginary line extending over both the supporting shafts 8c and 8d of the driving pulley 8a and the driven pulley 8b, a guide path 13 and an exhaust port 14 are arranged. The distance L between the inner surface of the case 10A and the outer peripheral portions of the drive pulley 8a and the driven pulley 8b on the existence side and the opposite side of the guide path 13 and the exhaust port 14 with respect to the above imaginary line.
1 is set to be larger than the distance L2 between the inner surface of the case 10A and the outer peripheral portions of the driving pulley 8a and the driven pulley 8b on the opposite side. With the above configuration,
Air is drawn 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 exhausted from the exhaust port 14, whereby heat is not stored in the case 10A.

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 L1, L2 interval

Claims (1)

(57) [Claims] 1. A driving pulley (8a) and a driven pulley
(8b) A belt-type continuously variable transmission mechanism comprising:
(8) is covered with a case (10A), and the imaginary line extending over both the supporting shafts (8c) and (8d) of the driving and driven pulleys (8a) and (8b) is positioned on the same side on one side. An air inlet (13) for sucking air into the case (10A) and an air outlet (14) for discharging air from the case (10A) are arranged in a case (10A) portion. (13) The air inlet (13) and the air outlet (1 ) for sucking the air into the case (10A) and discharging the air from the air outlet (14) are provided.
4) On the existence side and the opposite side, the said on the existence side
Inner surface of case (10A) and said drive and driven pulley
The distance (L1) between the outer peripheral portion of (8a) and (8b) is reversed.
The inner surface of the case (10A) on the side and the drive and
The distance between the driven pulleys (8a) and (8b) and the outer periphery (L
Belt type stepless change set larger than 2)
Speed mechanism.