JP3086199B2 - 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. [1] A belt-type continuously variable transmission configured with a driving pulley and a driven pulley is covered with a case, and an intake port for sucking air into the case, an exhaust port for discharging air from the case, and an air intake. Air blowing means for inhaling the air into the case from the mouth and discharging the air from the exhaust port. The mouth is arranged.

[2] In the configuration of the above [1], the direction of the exhaust port is set so as to be along a tangent line extending from one of the driving and driven pulleys.

[0006]

According to the first aspect of the present invention, the belt-type continuously variable transmission is covered by the case, and the case can prevent muddy water from adhering to the belt-type continuously variable transmission. Problems caused by muddy water or the like adhering to the belt-type continuously variable transmission mechanism (for example, slippage on the contact surface between the transmission belt and the driving and driven pulleys, and wear on the contact surface) can be prevented. Further, by covering the belt-type continuously variable transmission mechanism with the case, the noise generated from the belt-type continuously variable transmission mechanism can be hardly transmitted to the outside.

[II] When the belt-type continuously variable transmission mechanism is covered by the case as described in the preceding item [I], a structure for discharging heat generated from the belt-type continuously variable transmission mechanism from the case is required. According to the first aspect of the present invention, there is provided an intake port, an exhaust port, and a blast means. Air is sucked into the case from the intake port by the blast means, and the air is generated together with heat generated from the belt-type continuously variable transmission mechanism. Is discharged from the exhaust port.

In this case, since the driving and driven pulleys are rotating, air near the driving pulley (driven pulley) is rotated by the rotation of the driving pulley (driven pulley).
It flows along the radial direction of the driving pulley (driven pulley). According to the feature of claim 1, by rotating one of the drive and driven pulleys, by arranging the exhaust port on the peripheral wall portion of the case where the air flowing in the radial direction from one pulley hits, the drive and driven pulleys are driven. The air flowed in the radial direction by the rotation of one of the driven pulleys reaches the exhaust port and is discharged from the exhaust port.
As described above, according to the first aspect of the present invention, in addition to the intake port and the blast means, the rotation of one of the drive and driven pulleys causes the air to be positively discharged from the exhaust port. As a result, the air in the case is efficiently exchanged with new air, and the state in which high-temperature air stays in the case is reduced, and the air is exhausted together with the heat generated from the belt-type continuously variable transmission. Efficiently discharged from

[III] According to the feature of the second aspect, similar to the case of the first aspect, the "action" described in the above-mentioned [I] and [II] is provided, and in addition, the following "action" is provided. "Is provided. When the driving pulley (the driven pulley) rotates, the air near the driving pulley (the driven pulley) is rotated in the radial direction of the driving pulley (the driven pulley) by the rotation of the driving pulley (the driven pulley). Flow along the tangential direction of

According to a second aspect of the present invention, the direction of the exhaust port is set along a tangent line extending from one of the driving and driven pulleys. This allows
Due to the rotation of one of the driving and driven pulleys, the air flowing along the tangential direction in the radial direction of one of the driving and driven pulleys reaches the exhaust port and is smoothly discharged from the exhaust port. Therefore, the air is efficiently discharged from the exhaust port together with the heat generated from the belt-type continuously variable transmission.

[0011]

According to the first aspect of the present invention, by providing a case for covering the belt-type continuously variable transmission mechanism, it is possible to prevent muddy water and the like from adhering to the belt-type continuously variable transmission mechanism, and to provide a belt-type continuously variable transmission mechanism. (Eg, slip on the contact surface between the transmission belt and the driving and driven pulleys, and wear on the contact surface) can be prevented. The durability of the step transmission mechanism was improved. According to the first aspect of the present invention, since the belt-type continuously variable transmission mechanism is covered with the case, noise generated from the belt-type continuously variable transmission mechanism can be hardly transmitted to the outside. Could be improved.

According to the first aspect of the present invention, when the belt-type continuously variable transmission mechanism is covered with the case as described above, an intake port and a breeze unit are provided, and one of the driving and driven pulleys is rotated by rotation of one of the driving and driven pulleys. By arranging the exhaust port on the peripheral wall of the case where the air flowing in the radial direction from one pulley hits, the air in the case is efficiently replaced with new air, and the heat generated from the belt-type continuously variable transmission mechanism is exhausted. , And the durability of the belt-type continuously variable transmission mechanism can be prevented from lowering due to heat.

According to the features of the second aspect, the "effect of the invention" of the first aspect is provided similarly to the case of the first aspect, and in addition to the "effect of the invention", the following "invention" is provided. Of the effect. According to the feature of the second aspect, when the belt-type continuously variable transmission mechanism is covered with the case as described above, the air flowing in the radial direction from one pulley is hit by the rotation of one of the drive and driven pulleys. In addition to placing the exhaust port on the peripheral wall of the case,
By setting the direction of the exhaust port along the tangent line extended from one of the driving and driven pulleys, the air in the case can be smoothly discharged from the exhaust port, and the belt type The heat generated from the step-variable mechanism can be efficiently discharged from the case, and the durability of the belt-type continuously variable transmission mechanism can be prevented from being reduced due to the heat.

[0014]

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 able to move up and down, and an engine provided at a front portion of the traveling machine 1. 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, the 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 that prevents dust and the like from entering the case 10A is provided in the exhaust port 14.

As shown in FIGS. 1 and 2, an exhaust port 14 is disposed on a peripheral wall portion of a case 10A to which air flowing in a radial direction from the driven pulley 8b is applied by rotation of the driven pulley 8b. Is set along a tangent line extending from the driven pulley 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 10A case 12 drafting means 13 intake port 14 exhaust port

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B60K 17/06 F16H 9/04 F16H 57/04

Claims (2)

(57) [Claims] 1. A belt type continuously variable transmission (8) comprising a driving pulley (8a) and a driven pulley (8b) is covered with a case (10A), and air is sucked into the case (10A). Inlet (13)
And an exhaust port (1) for discharging air from the case (10A).
4) and air from the inlet (13) to the case (1).
0A) and an air blowing means (12) for inhaling the air from the exhaust port (14), and the driving and driven pulleys (8a) and (8b) .
By the rotation of one pulley (8a), (8b),
The radial flow from one pulley (8a), (8b)
To the peripheral wall of the case (10A),
A belt-type continuously variable transmission mechanism provided with the exhaust port (14). Wherein the orientation of the exhaust port (14), said drive and driven pulley (8a), one flop of (8b)
2. The belt-type continuously variable transmission mechanism according to claim 1, wherein the belt-type continuously variable transmission mechanism is set in a direction along a tangent line extending from the wheels (8a) and (8b) .