JPH0649968Y2 - Winding transmission device - Google Patents

Description

[Detailed Description of the Invention] A. Purpose of the Invention (1) Field of Industrial Application The present invention is a portion of a rotary shaft rotatably supported by a cylindrical support provided on a support, the part protruding from the support. A pulley is fixed to the pulley, an endless belt is wound around the pulley, and a seal member for sealing the lubricating oil supplied between the support portion and the rotation shaft between the tip of the support portion and the rotation shaft. The present invention relates to a winding transmission device in which is installed.

(2) Conventional Technology Conventionally, such a winding transmission device is disclosed in, for example, Japanese Utility Model No. 61-36731
It is known from the official gazette.

(3) Problems to be Solved by the Invention In such an apparatus, in order to prevent the lubricating oil supplied between the support portion and the rotating shaft from leaking to the outside between the support portion distal end of the support and the rotating shaft. However, if the lubricating oil leaks from the sealing member, the scattered lubricating oil adheres and the belt deteriorates. However, there is no conventional one having a structure that takes into consideration such leakage and scattering of lubricating oil.

The present invention has been made in view of the above circumstances, and provides a winding transmission device capable of avoiding the adhesion of the lubricating oil to the belt even if the lubricating oil leaks from the seal member. With the goal.

B. Configuration of the Invention (1) Means for Solving the Problems According to the present invention, the guide member that covers the axially inner end of the pulley is fixed to the support.

(2) Operation According to the above configuration, even if the lubricating oil leaks from the seal member, the guiding member covering the inner end of the pulley guides the lubricating oil, and the adhesion of the lubricating oil to the belt is avoided.

(3) Embodiment An embodiment in which the present invention is applied to a balancer shaft driving winding transmission device for an internal combustion engine will be described below with reference to the drawings. First, in FIG. The cylinder block 2 is connected to the upper part, the oil pan 3 is connected to the lower part of the cylinder block 1, and the head cover 4 is connected to the upper part of the cylinder head 2.

Referring also to FIG. 2 and FIG. 3, a vertical plane passing through the axis of the crankshaft 5 is located above the crankshaft 5 rotatably supported by the cylinder block 1 while having a substantially horizontal axis. The first balancer shaft 6 and the second balancer shaft 7 are rotatably arranged parallel to the crankshaft 5 at positions substantially symmetrical with respect to. These balancer shafts 6 and 7 suppress secondary vibrations of the engine, and are inserted and arranged in the cylinder block 1 with one axial end thereof protruding from the outer surface of the side wall of the cylinder block 1. Thus, both balancer shafts 6 and 7 have eccentric weight parts (not shown) spaced apart in the axial direction thereof.

A pump case 8 is fixed to one side wall of the cylinder block 1 to form a housing of an oil pump (not shown) having the crank shaft 5 as a drive shaft between the side wall and the side wall. Is projected from the pump case 8. Then, the first drive pulley 9 of the first winding transmission device T1 is fixed to the projecting end of the crankshaft 5 from the pump case 8 and is further away from the cylinder block 1 than the first drive pulley 9. On the side of the second winding transmission device T2 second
The drive pulley 10 is fixed, the first and second drive pulleys 9,
10 is rotationally driven in the direction shown by the arrow in FIG.

The first winding transmission device T1 includes a valve camshaft 11 that is rotatably supported by the cylinder head 2 in parallel with the crankshaft 5 to drive the valve mechanism, and a water mounted on the outer surface of the side wall of the cylinder block 1. A timing transmission device for driving the pump 12, which is fixed to the first drive pulley 9, a driven cam shaft driving pulley 13 fixed to the valve operating cam shaft 11, and a pump shaft 12a of the water pump 12. The driven pulley 14 for driving the water pump and the first timing belt 15 suspended by the pulleys 9, 13, 14 are provided.

The second winding transmission device T2 includes the first and second balancer shafts 6,7.
It is a timing transmission device for driving. The second winding transmission device T2 includes a second drive pulley 10, a reverse drive driven pulley 16 that is interlocked with and coupled to the first balancer shaft 6, and a forward drive driven pulley that is provided on the second balancer shaft 7. 17 and a second timing belt 18 suspended on each pulley 10, 16, 17.

A gear case 20 is attached to the pump case 8 at a portion corresponding to the first balancer shaft 6 to cover a part of the pump case 8. That is, the gear case 20 is
It is attached to the cylinder block 1 together with the pump case 8 with bolts 21. The gear case 20 is provided with a cylindrical supporting portion 22 projecting outward with an axis line parallel to the first balancer shaft 6, and a cylindrical bearing metal 23 is interposed in the supporting portion 22. The rotary shaft 24 is rotatably supported.
Moreover, the reverse drive driven pulley 16 is fixed to the protruding end of the rotary shaft 24 from the support portion 22. That is, the reverse drive driven pulley 16 is formed in a cup shape that covers the support portion 22, and the reverse drive driven pulley is formed at a portion corresponding to the bottom of the cup.
16 is fixed to the tip of the rotary shaft 24 protruding from the support portion 22. A winding portion 16a for winding the second timing belt 18 is provided on the outer periphery of the reverse drive driven pulley 16, and the side edge of the second timing belt 18 wound around the winding portion 16a is regulated. The control collar 19 for the winding part 16a
Is fixed to the axially inner end of the.

Further, one end of the first balancer shaft 6 is rotatably supported by the pump case 8 and projects into the gear case 20. Thus, between the pump case 8 and the gear case 20, the gear 25 fixed to the end portion of the first balancer shaft 6 and the gear 26 integrally provided at the inner end of the rotary shaft 24 mesh with each other. .
Therefore, the power from the reverse drive driven pulley 16 is transmitted to the first balancer shaft 6 through the gears 25 and 26 meshing with each other. That is, both balancer shafts 6 and 7 are rotationally driven in mutually opposite directions.

Lubricating oil is supplied between the bearing metal 23 and the rotating shaft 24 from an oil supply passage 27 formed in the cylinder block 1, the pump case 8 and the gear case 20, and flows out between the rotating shaft 24 and the bearing metal 23. In order to prevent the lubricating oil from leaking from the outer end of the gear case 20 in the axial direction, the gear case 20 and the rotary shaft are located at a position axially outward from the bearing metal 23.
A seal member 28 is interposed between 24. In addition, the lubricating oil flowing out between the rotary shaft 24 and the bearing metal 23 to the seal member 28 side,
A discharge path 29 for returning between the gear case 20 and the pump case 8 is formed in the support portion 22 of the gear case 20.

Even if the sealing member 28 is provided, it is difficult to completely prevent the lubricating oil from leaking from the gear case 20 to the inner side of the driven pulley 16 for reverse drive, and the lubricating oil leaked is the first.
Also, it is necessary to avoid getting on the second timing belts 15 and 18. Therefore, the gear case 20 has a seal member.
The lubricating oil leaked from 28 is the first and second timing belts.
The guide member 30 for preventing the adhesion to the 15, 18 is fixed.

As shown in FIG. 4, the guide member 30 is formed in an arc shape surrounding the support portion 22, and the inner peripheral portion of the guide member 30 covers the axially inner end of the driven pulley 16 for reverse rotation drive. Is provided. Moreover, the guide member 30 is provided with, for example, three through holes 31 through which the bolts 21 are inserted, and the bolts 21 inserted into the through holes 31 are fixed to the gear case 20. The guide member 30 has a temporary support hole.
32 is provided in the gear case 20.
The boss portion 33 projecting from the is inserted.

By the way, on the side edge of the gear case 20, a wall portion 20a projecting outward along the axial direction of the rotating shaft 24 is projectingly provided, and a part of the wall portion 20a is an inner end of the reverse drive driven pulley 16. The guide member 30 is formed in an arc shape so as to cover the inner end of the reverse rotation drive driven pulley 16 except for the portion surrounded by the wall portion 20a. .

Referring also to FIG. 5, a support shaft 35 parallel to the crankshaft 5 is planted in the cylinder block 1 above the crankshaft 5. The spindle 35 has a first winding transmission device T1.
The first tensioner 36 for adjusting the tension of the first timing belt 15 is supported, and the second timing belt 18 of the second winding transmission device T2 is provided on the outer side in the axial direction with respect to the first tensioner 36. A second tensioner 37 for adjusting the tension is mounted.

The first tensioner 36 has a plurality of balls 40 interposed between an inner ring 38 supported by a support shaft 35 and an outer ring 39 slidingly contacting the outer surface of the first timing belt 15. The ring-shaped support member 41, which is press-fitted and fixed to the outer surface of the base end portion, is swingably supported by a shaft 42 that has an axis parallel to the support shaft 35 and that is fixed to the cylinder block 1. Thus, the inner ring 38 is provided with an arc-shaped elongated hole 43 centered on the shaft 42, and the support shaft 35 is inserted into the elongated hole 43. The support member 41 is engaged with the other end of the first tension spring 44 whose one end is engaged with the cylinder block 1, and the spring force of the first tension spring 44 causes the outer ring 39 of the first tensioner 36 to move to the first The timing belt 15 is pressed against the outside from its outside, whereby a constant tension is applied to the first timing belt 15.

The second tensioner 37 includes an inner ring 45 and a second timing belt.
A plurality of balls 47 are interposed between the outer ring 46 slidably contacting the 18 and the balls 47. One end of a tension arm 48 is fixed to the outer end of the inner ring 45, and the central portion of the tension arm 48 is rotatably supported by a bolt 49 screwed to the boss portion 33. Moreover, an arcuate elongated hole 50 centered on the bolt 49 is formed in the center of the inner ring 45, and the support shaft 35 is inserted into the elongated hole 50. Further, a second tension spring 51 is provided between the other end of the tension arm 48 and the cylinder block 1.
The outer ring 46 is pressed against the outside of the second timing belt 18 by the spring force of the second tension spring 51, whereby a constant tension is applied to the second timing belt 18.

Next, the operation of this embodiment will be described. The rotation of the crankshaft 5 drives both the first and second winding transmission devices T1 and T2. As a result, in the first winding transmission device T1, the valve camshaft 11 is driven with a speed reduction ratio of 1/2 with respect to the crankshaft 5 and the water pump 12 is driven.
In the third winding transmission device T2, both balancer shafts 6 and 7 are driven in opposite directions with a speed increasing ratio of 2/1 with respect to the crankshaft 5.

Thus, the lubricating oil between the rotary shaft 24 and the support portion 22 is prevented from leaking to the outside by the seal member 28. However, if the lubricating oil leaks from the seal member 28, the lubricating oil will rotate. The centrifugal force generated by the rotation of the shaft 24 scatters radially outward. However, the support portion 22 is surrounded by the guide member 30 and the wall portion 20a of the gear case 20, and the scattered lubricating oil is received by the cover portion 30a and the wall portion 20a of the guide member 30.
Therefore, the lubricating oil flows down along the cover portion 30a and the wall portion 20a, and the second timing belt 18 wound around the driven pulley 16 for reverse drive and the first timing of the second winding transmission device T1. The adhesion of the lubricating oil to the belt 15 is avoided, and the belt 15, 18 due to the adhesion of the lubricating oil is prevented.
Is prevented from deteriorating.

By the way, the support portion 22 and the rotary shaft 24 have a substantially horizontal axis, and the guide member 30 is formed in an arc shape.
When the gear is attached to the gear case 20, the boss portion 33 is inserted into the temporary support hole 32 of the guide member 30. Then, the guide member 30 can be almost positioned, and the bolts 21 can be tightened with the hands separated from the guide member 30, and the mounting operation becomes extremely easy.

Moreover, the boss portion 33 is provided to support the tension arm 48 connected to the second tensioner 37 for adjusting the tension of the second timing belt 18, and the boss portion corresponding to the temporary support hole 32. It is possible to contribute to downsizing, since it is not necessary to provide specially.

C. Effect of the Invention As described above, according to the present invention, since the guide member that covers the inner end of the pulley in the axial direction is fixed to the support, even if the lubricating oil leaks from the seal member, It is possible to avoid adherence to the belt and prevent deterioration of the belt.

[Brief description of drawings]

The drawings show one embodiment of the present invention. Fig. 1 is a side view of an internal combustion engine, Fig. 2 is an enlarged sectional view taken along line II-II of Fig. 1, and Fig. 3 is III-III of Fig. 1. A line enlarged sectional view, FIG. 4 is a front view of the guide member, and FIG. 5 is an enlarged sectional view taken along line VV of FIG. 16 ... Pulley, 18 ... Belt, 20 ... Gear case as a support, 22 ... Supporting part, 24 ... Rotating shaft, 28 ... Seal member, 30 ... Induction member, T2 ... Wrapping transmission device

Claims (1)

[Scope of utility model registration request] 1. A pulley is fixed to a portion of a rotary shaft rotatably supported by a cylindrical support portion provided on a support member, the portion protruding from the support portion, and an endless belt is wound around the pulley. In a winding transmission device in which a seal member for sealing the lubricating oil supplied between the support portion and the rotation shaft is interposed between the tip of the support portion and the rotation shaft, the axial inner end of the pulley is covered. A winding transmission device characterized in that an induction member is fixed to a support.