KR101725718B1 - Transmission - Google Patents

Abstract

An object of the present invention is to efficiently supply lubricating oil to a bearing which supports a disc-shaped rotating body when the temperature is low at the initial stage of starting or when the environmental temperature is low.
A transmission apparatus (13) in which a transmission mechanism (30) including a disk-shaped rotating body (44) for transmitting power is housed in a casing (70) is disclosed. A lubricating oil 66 is stored in the bottom of the case. The disk rotating body is rotatably supported by the case by a shaft 31 and a bearing 52 for supporting the shaft. A gap 77 and a gap enlarging portion 95 in which the size of the gap is enlarged are formed between the inner surface 75a of the side wall 75 of the case and the side surface 44a of the disk rotating body. The gap is set to such a size as to enable the lubricant to be gradually lifted up between the inner surface of the side wall of the case and the side surface of the disk-shaped rotary body by rotating the disk-shaped rotary body. The gap enlarging section is located above the oil level of the lubricating oil stored in the case and communicates with the oil passage 81 when the transmission device is in the used state.

Description

TRANSMISSION

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a transmission apparatus in which an inner lubrication structure of a case is improved.

In the transmission apparatus, a transmission mechanism including a disk-shaped rotating body (for example, a spur gear) for transmitting power is housed inside the case. The power transmission device having such a configuration is known, for example, from Patent Document 1.

The transmission device known in Patent Document 1 is adopted as a transmission of a management machine, which is a kind of a working machine. A transmission mechanism including a spur gear for transmitting power, that is, a disk-shaped rotary body, is accommodated in an elongated case body that is slanting upward in the rear side. The upper end of the case body is opened and is generally covered by a lid. The flat gear or the sprocket is rotatably supported on the case body by a horizontal shaft and a bearing supporting the shaft.

In such a transmission apparatus, lubricating oil is often stored in the bottom portion of the case body. However, the case body is slender up and down. Therefore, a part of the spur gear located at the upper portion of the case body may be completely exposed from the lubricating oil. Care must be taken to efficiently supply the lubricating oil to the bearing supporting the spur gear exposed from the lubricating oil. On the contrary, it is considered to provide an oil passage for guiding the lubricating oil stored in the case body to the bearing. The transmission device having such a configuration is known from Patent Document 2.

A transmission device known in Patent Document 2 is employed in a transmission of a vehicle. A transmission mechanism including a plurality of gears (disc-shaped rotors) that transmit power is housed in a case body. The plurality of gears are rotatably supported on the case body by a horizontal shaft and a bearing for supporting the shaft. Both ends of the case body in the horizontal direction are closed so as to be removable by separate members. Lubricating oil is stored in the bottom portion of the case body. Of the plurality of gears, a part of the large diameter gear is immersed in the lubricating oil. As the large diameter gear rotates, the lubricating oil is scratched and scattered inside the case body. Inside the case body, a receiver (oil receiving portion) formed of a member separate from the case body is provided. The receiver collects the scattered lubricating oil and guides it to the lubrication position.

Generally, however, at the initial stage of starting the transmission, the temperature of the lubricating oil stored in the case is about room temperature, which is lower than during the operation. Therefore, the viscosity of the lubricating oil at the initial stage of starting is large. The fluidity of the lubricating oil is lowered during operation. Even if lubricating oil having low fluidity is scattered, there remains a problem of efficiently supplying a necessary amount of lubricating oil to a position requiring lubrication. Therefore, even in this case, care must be taken to efficiently supply the lubricating oil to the bearing. The same applies to the case where the temperature of the environment in which the power transmission apparatus is used is low.

Patent Document 1: JP-A-63-82827 Patent Document 2: Japanese Patent Laid-Open Publication No. 2011-7208

SUMMARY OF THE INVENTION It is an object of the present invention to provide a technique capable of efficiently supplying lubricating oil to bearings that support a disc-shaped rotating body when the temperature is low or the environmental temperature is low in the initial stage of starting.

According to the present invention, a transmission mechanism including a disk-shaped rotating body for transmitting power is housed in a casing, and lubricating oil is stored in a bottom portion of the casing. The disk- Wherein a gap is formed between the inner surface of the side wall of the case and the side surface of the disk-shaped rotating body, and a gap enlarging portion enlarged in size of the gap is formed, Wherein the gap is set such that the lubricating oil can be gradually raised from between the inner surface of the side wall of the case and the side surface of the disk rotating body by rotating the disk rotating body, (Oil surface) of the lubricating oil stored in the case at the time of the posture of the lubricating oil, The power transmission device, characterized in that the barrel is provided.

Therefore, the lubricating oil having a high viscosity and low fluidity due to the low temperature or low environmental temperature at the initial stage of startup is gradually raised (washed away) from the gap between the inner surface of the side wall of the case and the side surface of the disk- . Since the lubricating oil gradually enters the gap enlarging portion, the lubricating oil does not gradually rise above it. The lubricating oil gradually raised in this way flows into the oil passage from the gap enlarged portion and is guided to the bearing. Therefore, the lubricating oil stored in the case body can be efficiently supplied to the bearing supporting the disk-shaped rotating body. Moreover, since only the size of the clearance is set to the optimal one, the configuration for supplying the lubricant can be simplified and no new member is required.

Preferably, the case includes a case body having an open top surface and a lead covering the top surface. The gap enlarging portion is formed in the lead. It is only necessary to form the gap enlarged portion on the lead, so that the configuration for supplying the lubricating oil can be simplified and no new member is required.

Preferably, the disc-shaped rotating body is constituted by an upper gear located higher than the oil level of the lubricating oil stored in the case when the transmission is in the used state. In the case, a lower gear which is positioned lower than the upper gear and engages with the upper gear is accommodated. At least a part of the teeth of the lower gear is immersed in the lubricating oil stored in the case.

Therefore, the lubricating oil stored in the case can be scraped by the teeth of the lower gear. Part of the scraped lubricant remains in the tooth groove. The remaining lubricating oil can be transmitted from the lower gear teeth to the upper gear teeth by engaging the teeth of the upper and lower gears with each other. A part of the lubricating oil delivered to the tooth groove of the upper gear flows in the tooth width direction and flows out to the gap between the inner surface of the side wall of the case and the side surface of the tooth of the upper gear. The lubricating oil that has flowed into the gap gradually rises (rises) as the upper gear rotates. In this way, the lubricating oil stored in the case can be efficiently supplied to the bearing.

Preferably, the flow path is opened upward. The gap enlarging portion is located just above the flow path. Therefore, it is possible to surely and efficiently receive the lubricating oil that has gradually entered the gap enlarging portion through the oil passage immediately below the gap increasing portion.

According to the present invention, lubricating oil can be efficiently supplied to bearings that support the disk-shaped rotating body when the temperature is low or the environmental temperature is low at the initial stage of starting.

1 is a side view of a working machine according to the present invention.
2 is a cross-sectional view of the transmission shown in Fig.
Fig. 3 is a schematic view showing the power transmission system and the case shown in Fig. 1, viewed from the rear side of the working machine.
4 is a cross-sectional view of the transmission shown in Fig. 2 as seen from the rear.
5 is a view in the direction of the line of sight of the arrow 5 in Fig.
Fig. 6 is an exploded perspective view of an upper end portion of the case body and the lid shown in Fig. 5;
7 is a top view of the case body shown in Fig. 6 viewed from above.
Fig. 8 is an enlarged view of the fourth gear shown in Fig. 4;
9 is a sectional view taken along the line 9-9 in Fig.
Fig. 10 is a perspective view of the transmission shown in Fig. 4, with the leads omitted and the rear side viewed from above; Fig.
11 is a bottom view of the lead shown in Fig.
12 is an operational view of the transmission shown in Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

Example

The power transmission apparatus according to the embodiment will be described with reference to the drawings. Hereinafter, a working machine will be described as an example of a device equipped with a transmission device. The working machine is constituted by, for example, a walking tiller. Further, according to the direction seen from the operator who controls the cultivator, "forward", "after", "left", "right", " Le indicates left side, and Ri indicates right side.

1, the tiller 10 (working machine 10) includes a machine body 11, a power source 12 attached to a front upper portion of the machine body 11, A working unit 14 attached to the lower portion of the transmission unit 13 and an operation handle 15 extending upward from the transmission unit 13 in the rear side, do. A center portion in the height direction of the transmission device 13 is attached to the rear portion of the base body 11. [

As shown in Figs. 1 and 2, the transmission 13 is slanted downward from the upper end toward the front side, and is configured to be elongated. That is, as shown in Fig. 1, in the use condition of the tiller 10, the transmission 13 is inclined downward from the upper end to the front side.

As shown in Figs. 1 and 3, the power source 12 is constituted by, for example, an engine or an electric motor. The power generated by the power source 12 is transmitted to the transmission device 13 by the belt transmission mechanism 20 and is transmitted from the transmission device 13 to the working portion 14. [

The belt transmission mechanism 20 includes a drive pulley 21 attached to the output shaft 12a of the power source 12 and a driven pulley 21 attached to the input shaft 31 (first shaft 31) A pulley 22 and a belt 23 sandwiched between the pulleys 21 and 22. The output shaft 12a of the power source 12 horizontally extends from the power source 12 to the left or right. The input shaft 31 extends horizontally in the width direction of the base 11. [ One end portion 31a of the input shaft 31 on which the driven pulley 22 is installed is directed in the same direction as the output shaft 12a of the power source 12. [ The belt transmission mechanism (20) is covered by a cover (24). The belt transmission mechanism 20 is provided with a belt tensioner type clutch 25. The belt tensioner type clutch 25 is operated by the clutch lever 26 provided on the operation handle 15. [

The working unit 14 is a so-called tillage working unit comprising a plurality of tillage claws 14a provided on the output shaft 33 (tiller shaft 33) of the transmission 13. The output shaft (33) extends horizontally in the width direction of the base (11). The cultivator 10 having such a configuration is a walking type self cultivator of the type in which soil such as agricultural land is tilled by rotation of a plurality of tillage claws 14a and further traveled by a plurality of tillage claws 14a.

As shown in Figs. 2 to 4, the transmission device 13 has a structure in which the transmission mechanism 30 is housed in a case 70. Fig. The case 70 includes a case body 71 and a lead 91. The case body 71 is an elongated, bottomed casting that is inclined forwardly downward from the top. In the case body 71, basically, only the upper end surface 72 is opened except for the portion through which various shafts pass. The top surface 72 is covered by a lead 91.

The transmission mechanism 30 includes an input shaft 31 (first shaft 31), a counter shaft 32 (second shaft 32), an output shaft 33 (a third shaft 33, The second gear 42 of the large diameter and the third gear 43 of the small diameter (the counter gear 43 (the shaft 33)), the first gear 41 (the input gear 41) Diameter sprocket 45 (drive sprocket 45), and a large-diameter sprocket 46 (a driven sprocket 46). The large-diameter fourth gear 44, the small-

The outer diameter of the first gear 41 is smaller than the outer diameter of the second gear 42 and larger than the outer diameter of the third gear 43. The outer diameter of the second gear 42 is larger than the outer diameter of the third gear 43 and smaller than the outer diameter of the fourth gear 44.

The input shaft 31 is located near the front upper portion of the inside of the case body 71, that is, near the side wall 73 in front of the case body 71 (see Fig. 2). Both ends of the input shaft 31 are rotatably supported by the left and right side walls 74 and 75 of the case body 71 by the left and right bearings 51 and 52. The bearing 51 located on the left side wall 74 is referred to as a first bearing first bearing 51. The bearing 52 located on the right side wall 75 is referred to as a second bearing second bearing 52 for the first axis. The axially inner end surfaces of the first bearing 51 for the first axis and the second bearing 52 for the first axis face the inside of the case body 71.

One end portion 31a of the input shaft 31 on which the driven pulley 22 (see Fig. 3) is provided is formed to extend through the left side wall 74 of the case body 71 to the outside in the width direction of the base body 11 Extended. The portion of the input shaft 31 penetrating through the left side wall 74 is sealed by the seal member 53. [ With respect to the input shaft 31, the counter shaft 32 and the output shaft 33 are parallel.

The counter shaft 32 is located at the rear upper portion of the inside of the case body 71, that is, below the rear side of the input shaft 31. In other words, the counter shaft 32 is located near the side wall 76 on the rear side of the case body 71 (see Fig. 2). Both ends of the counter shaft 32 are rotatably supported by the left and right side walls 74 and 75 of the case body 71 by the left and right bearings 54 and 55, respectively. The bearing 54 located on the left side wall 74 is referred to as a first bearing 54 for the second shaft. The bearing 55 located on the right side wall 75 is referred to as a second bearing second bearing 55. The axially inner end surfaces of the first bearing (54) for the second axis and the second bearing (55) for the second axis face the inside of the case body (71).

As is apparent from the above description, the input shaft 31 is positioned higher than the counter shaft 32. Hereinafter, the input shaft 31 is referred to as the " upper axis 31 ", and the counter shaft 32 is referred to as the " lower axis 32 "

As shown in Fig. 4, a through hole 75b is formed in the right and left side walls 74, 75 on the side where the counter shaft 32 is inserted into the case body 71. The through hole 75b is closed by the cap 56 after the counter shaft 32 is inserted into the case body 71. [

As shown in Figs. 2 to 4, the output shaft 33 is located in the lower portion of the inside of the case main body 71. Fig. The output shaft 33 is rotatably supported by the left and right side walls 74 and 75 of the case body 71 by left and right bearings 57 and 58 and is rotatably supported by the left and right side walls 74 and 75, 11 in the width direction. Portions of the output shaft 33 passing through the right and left side walls 74 and 75 are sealed by a seal member (not shown).

The types of the gears 41 to 44 may be of any type capable of transmitting power between shafts 31 and 32 which are parallel to each other. For example, each of the gears 41 to 44 is constituted by a spur gear. Each of the gears 41 to 44 and the sprockets 45 and 46 is a disk-shaped rotating member and therefore is a kind of disk-shaped rotating body. That is, the transmission mechanism (30) includes disk-shaped rotors (41 to 46) for transmitting power. Each of the disk-shaped rotors 41 to 46 is supported by the bearings 51, 52, 54, 55, 57 and 58 supporting the axles 31 to 33 and the axles 31 to 33 And is rotatably supported by the case body 71. Each of the bearings 51, 52, 54, 55, 57 and 58 is constituted by a rolling bearing such as a ball bearing.

The first gear 41 is coupled to the first shaft 31 by serration. The second gear 42 engaged with the first gear 41 is coupled to the second shaft 32 by serration. The third gear 43 is integrally formed on the second shaft 32, that is, is fixed to the second shaft 32. The fourth gear 44 engaged with the third gear 43 is supported on the first shaft 31 so as to be relatively rotatable by the needle bearing 61.

The drive sprocket 45 is integrally rotatable with the fourth gear 44 and is supported on the first shaft 31 so as to be relatively rotatable by the needle bearing 62. [ In other words, the drive sprocket 45 is integrally formed with the fourth gear 44.

The driven sprocket (46) is coupled to the third shaft (33). The drive sprocket 45 and the driven sprocket 46 are connected by a chain 47.

1 and 2, the working portion 14, the third axis 33 and the driven sprocket 46 are moved in the advancing direction Ruf (counterclockwise when the tiller 10 is viewed from the left side room) . Therefore, the first shaft 31, the first gear 41, the fourth gear 44 and the drive sprocket 45 rotate in the same direction as the forward rotation direction R1, that is, the driven sprocket 46 . On the other hand, the second shaft 32, the second gear 42 and the third gear 43 rotate in the reverse rotation direction R2 (the reverse direction R2 with respect to the first shaft 31). The first gear 41 and the second gear 42 are engaged with each other from below to above. The third gear 43 and the fourth gear 44 are engaged with each other from below to above.

4, the arrangement of the first gear 41, the fourth gear 44, and the drive sprocket 45 with respect to the first shaft 31 is as follows. The first gear 41 is adjacent to the inner surface of the left side wall 74 near the one end 31a of the input shaft 31 of the case body 71 and is also disposed adjacent to the inner surface of the first side bearing 51, As shown in Fig. The fourth gear 44 is adjacent to the inner surface 75a of the right side wall 75 of the case body 71 and adjacent to the side surface of the inner ring of the second shaft 52 for the first axis.

A spacer 63 is interposed between the side surface 44a of the fourth gear 44 and the side surface of the inner ring of the second bearing 52 for the first axis. A clearance 77 is formed between the side face 44a of the fourth gear 44 and the inner face 75a of the right side wall 75 of the case body 71. [ The right side wall 75 is hereinafter referred to as " side wall 75 on the exposed bearing side, " as appropriate.

The drive sprocket 45 is located between the first gear 41 and the fourth gear 44, that is, substantially at the center in the width direction of the case body 71. A spacer 64 is interposed between the first gear 41 and the drive sprocket 45.

2 and 4, the outer peripheral surface of the fourth gear 44 protrudes upward from the upper end surface 72 of the case body 71. As shown in Fig. On the other hand, the first gear 41, the drive sprocket 45, and the chain 47 do not protrude upward from the upper end surface 72 of the case body 71. The outer peripheral surface of the second gear 42 is slightly lower than the upper end surface 72 of the case body 71.

As apparent from the above description, when the tiller 10 (see Fig. 1) is in use, that is, when the transmission 13 is in the used state, the input shaft 31 is positioned higher than the counter shaft 32 have. Hereinafter, the input shaft 31 is referred to as the " upper axis 31 ", and the counter shaft 32 is referred to as the " lower axis 32 ".

The first gear 41 fixed to the upper shaft 31 is appropriately referred to as the " upper gear 41 ". The second gear 42 positioned below the first gear 41 and meshing with the first gear 41 is appropriately referred to as a "lower gear 42". The fourth gear 44 supported on the upper shaft 31 is appropriately referred to as the " upper gear 44 ". The third gear 43 positioned below the fourth gear 44 and engaged with the fourth gear 44 is appropriately referred to as a "lower gear 43". As described above, the gears 41 to 44 are accommodated in the case 70.

2 and 4, a lubricating oil 66 is stored in the bottom portion of the case body 71. As shown in Fig. The upper limit level Lu of the oil level 66a of the lubricating oil 66, that is, the upper limit storage level Lu is a preset constant level. The retention upper limit level Lu is set such that the lower portion of the third gear 43 (the counter gear 43) of the small diameter is slightly immersed in the lubricating oil 66 in the stopped state of the transmission 13, It is preferable that the second axis 32 is set to a degree that the second shaft 32 is slightly exposed from the lubricant oil 66. This is because if the storage upper limit level Lu is excessively high, the rolling resistance becomes excessively large when the transmission 13 is operated.

More specifically, the first gear 41 and the fourth gear 44 (the upper gears 41 and 44) are stored in the case 70 when the transmission device 13 is in the used state Which is higher than the oil level 66a of the lubricating oil 66 having the lubricating oil. On the other hand, at least some of the teeth of the second gear 42 and the third gear 43 (the lower gears 42 and 43) are immersed in the lubricating oil 66 stored in the case 70.

When the upper limit level Lu is set as described above, the lubrication of the first bearing 54 for the second shaft and the second bearing 55 for the second shaft is sufficient. The lubrication of the teeth of the first gear 41 and the second gear 42 and the lubrication of the tooth surfaces of the third gear 43 and the fourth gear 44 and the lubrication of the sprockets 45, Lubrication of the chain 47 is sufficient.

However, the first gear 41, the fourth gear 44, and the drive sprocket 45, which are disposed on the first shaft 31 and the first shaft 31, Is positioned higher than the level (Lu), that is, is completely exposed from the lubricant oil (66). By setting the outer diameter of the first gear 41 to be smaller than the inner diameter of the outer ring of the first-shaft first bearing 51, the lubrication of the first-shaft first bearing 51 is sufficient. However, in order to sufficiently lubricate the second bearing 52 for the first axis, there is room for further improvement.

In contrast, in the present invention, the lubricating structure inside the case 70 is improved in order to sufficiently lubricate the second bearing 52 for the first axis. Hereinafter, the case 70 will be described in detail.

2, 5 and 6, the case body 71 is formed in a substantially rectangular cross-section that is elongated in the front-rear direction when viewed in plan, and has a front side wall 73 and a left side wall 74, A right side wall 75 and a rear side wall 76. [ The upper end surface 72 of the case body 71 is a flat surface orthogonal to the vertical center line CL of the case body 71. As described above, since the case body 71 is inclined from the upper end to the front side downward, the upper end surface 72 is inclined from the front end to the rear side downward.

The upper end surface 72 of the case body 71 is open. A flange 79 is integrally formed around the entire periphery of the opening 78 of the upper end surface 72 of the case body 71.

6 to 9, a flow path 81 is formed at the periphery of the upper surface of the case 70, that is, the opening 78 of the upper end surface 72 of the case body 71. The flow path 81 is formed directly on the peripheral edge of the opening 78. 10, the oil passage 81 can receive the scattered lubricating oil 66b that is splashed by the disk-shaped rotors 41 and 42, that is, the first gear 41 and the second gear 42 The top is open.

6 and 7, the flow path 81 is continuous with the upper end surface of the front side wall 73 and the upper end surface of the right side wall 75 among the peripheral edges of the opening 78, And is formed in a substantially L-shape in plan view. The lower end face 72 of the case body 71 is formed with a lower stepped surface 82 between the inside of the case body 71 and the flow path 81. Therefore, the scattered lubricating oil 66b is likely to enter the oil passage 81 from the inside of the case body 71.

7 to 9, the oil passage 81 is formed in such a manner that the received scattered lubricating oil 66b is supplied to the lubricating portion 52 (see FIG. 8) in the use state of the tiller 10 (The second bearing 52 for the first axis). That is, the upstream end 81a of the flow path 81 is located at the corner between the upper end face of the left side wall 74 and the upper end face of the front side wall 73. The downstream end 81b of the flow path 81 is located directly above the second bearing 52 for the first axis in the upper surface of the right side wall 75 (the side wall 75 on the exposed bearing side). Therefore, the flow path 81 is formed with a downward slope from the upstream end 81a toward the downstream end 81b. This makes it possible to easily supply the scattered lubricating oil 66b from the oil passage 81 to the lubricating portion 52 in the state of use of the tiller 10.

8 and 9, an oil block 83 and an oil hole 84 are formed in the right side wall 75 below the downstream end 81b of the oil passage 81 . The oil blocking portion 83 is adjacent to the axial outer surface 52a of the first shaft second bearing 52. [ The oil hole 84 communicates the downstream end 81b and the oil block 83 with each other. As a result, the oil passage 81 is communicated with the oil block 83.

6, 8, 9 and 11, the lead 91 includes a cover portion 92 covering the opening 78, a flange 93 formed at the periphery of the cover portion 92 ). ≪ / RTI > The cover portion 92 is formed in a cup shape which is opened at the lower end and has an upwardly bulged bottom. The flange 93 is bolted to the flange 79 of the case body 71 so as to overlap the peripheral edge of the opening 78.

The lead 91 covers the upper end surface 72 of the case body 71 while maintaining the open state above the flow path 81. The lead 91 is positioned such that at least a part of the boundary between the cover portion 92 and the flange 93 is located just above the flow path 81. [

The top plate 94 of the cover portion 92 is formed in a substantially flat plate shape inclined from the left end toward the right end. Therefore, the lubricating oil adhered to the lower surface of the upper plate 94 can be guided toward the oil line 81.

The inner surface 75a of the right side wall 75 and the side surface 44a of the fourth gear 44 of the case body 71 of the case 70, as shown in Figs. 4, 6, 8 and 9, An enlarged gap portion 95 is formed in which the size of the gap 77 is enlarged. The gap enlarging portion 95 is positioned higher than the oil level 66a of the lubricating oil 66 stored in the case 70 and communicates with the oil passage 81 when the transmission device 13 is in the used state .

The clearance enlarging portion 95 is located directly above the flow path 81 and is integrally formed with the lead 91. [ Therefore, the configuration for supplying the lubricating oil 66 can be simplified and no new member is required.

Specifically, the gap enlarging portion 95 is adjacent to the upper end of the right side surface 44a of the fourth gear 44 and communicates with the upper end of the gap 77. 6 to 8, the gap enlarging portion 95 is constituted by an inclined member 96 inclined from the right end of the top plate 94 of the lead 91 toward the flange 93 . The inclined member 96 is positioned so as to form a space portion, that is, a gap enlarged portion 95, on the downstream end 81b of the flow path 81. [ That is, the inclined member 96 is inclined so as to guide the lubricant 66c, which has entered the gap enlarging portion 95, The lubricating oil 66c slowly rising from the gap 77 enters the gap enlarging portion 95 and rides on the inner surface of the inclined member 96 And can flow down to the downstream end 81b of the flow path 81. [

8, the clearance 77 is formed by the rotation of the fourth gear 44 from the gap between the inner surface 75a of the right side wall 75 and the side surface 44a of the fourth gear 44, It is set so that it is possible to gradually raise the upper portion 66c.

The above explanation is summarized as follows. 4 and 10, a flow path 81 having an open top is formed at the peripheral edge of the opening 78 of the upper end surface 72 of the case body 71. As shown in Fig. As shown in Fig. 10, the scattered lubricating oil 66b, which is splashed by the second gear 42, reaches the oil line 81. As shown in Fig. The oil passage 81 is capable of receiving the above-described arsenic lubricating oil 66b. 8 and 9, the scattered lubricating oil 66b flows from the oil passage 81 through the oil hole 84 to the oil blocker 83. As a result, The scattered lubricating oil 66b accumulated in the oil retaining portion 83 is supplied to the second shaft second bearing 52 for the first shaft. Therefore, the scattered lubricating oil 66b can be easily guided from the oil passage 81 to the second shaft second bearing 52 for the first shaft.

Further, as shown in Figs. 4, 9 and 10, the lid 91 covers the upper end surface 72 of the case main body 71 while maintaining the open state above the flow path 81. It is possible to efficiently supply a small amount of the lubricating oil 66 to the second bearing 52 for the first shaft which supports the fourth gear 44 exposed from the lubricating oil 66 stored in the case body 71 have.

Furthermore, the flow path 81 is formed directly on the peripheral edge of the opening 78. [ Therefore, it is not necessary to configure the flow path 81 as a separate member with respect to the case body 71. The flow path 81 can be made simple in comparison with the case where the flow path 81 is formed of a separate member with respect to the case body 71. [ The number of components of the case body 71 having the flow path 81 can be reduced. In addition, since the flow path 81 needs only to be formed directly on the peripheral edge of the opening 78 of the case body 71, the degree of freedom in arranging the flow path 81 can be increased. Since the power transmission device 13 having the improved configuration is mounted on a machine such as the working machine 10 (see Fig. 1), that is, a so-called practical machine, the weight, weight distribution, Can be reduced as much as possible.

Further, in the case body 71, an oil block 83 adjacent to the axial outer surface 52a of the first bearing second bearing 52 is formed. The oil passage 81 communicates with the oil block 83. For this reason, the scattered lubricating oil 66b is guided from the oil passage 81 to the oil block portion 83. The second shaft second bearing 52 can be easily and efficiently lubricated by the scattered lubricating oil 66b accumulated in the oil retainer 83. [

At least a part of the boundary between the cover portion 92 and the flange 93 of the lid 91 is located just above the flow path 81. In addition, Therefore, even if a part of the scattered lubricating oil 66b sprung up by the second gear 42 is attached to the cover portion 92, the cover portion 92 is moved from the boundary with the flange 93 to the oil passage 81 It flows down. Therefore, the lubricant oil 66b can be more efficiently recovered by the oil line 81. [

On the other hand, there may be a case where the viscosity of the lubricating oil 66 is high and the fluidity is low due to low temperature at the start of starting the transmission 13 or low environmental temperature when the transmission 13 is used. In this case, the lubricating oil 66 having low fluidity can be lubricated with the inner surface 75a of the side wall 75 of the case 70 by the rotation of the fourth gear 44 as shown in Figs. 4, 8, (Sweeps up) from the gap 77 between the side surfaces 44a of the fourth gear 44. As shown in Fig. Since the lubricating oil 66c gradually enters the gap increasing portion 95, the lubricating oil 66c does not gradually rise. The lubricating oil 66c gradually flows from the gap enlarging portion 95 to the oil passage 81 and is led to the first shaft second bearing 52 through the oil hole 84 and the oil cone portion 83 . Therefore, the lubricating oil 66 stored in the case body 71 can be efficiently supplied to the second bearing 52 for the first axis. Furthermore, since the size of the gap 77 is merely set to be optimum, the configuration for supplying the lubricant 66 can be simplified and no new member is required.

More specifically, the lubricating oil 66 stored in the case 70 can be scraped off by the teeth of the third gear 43. A part 66c of the scraped lubricating oil 66 remains in the tooth groove. The remaining lubricating oil 66c can be transmitted from the tooth groove of the third gear 43 to the tooth groove of the fourth gear 44 by engaging the teeth of the upper and lower third gear 43 and fourth gear 44 with each other have. A part 66c of the lubricating oil transferred to the toothed groove of the fourth gear 44 flows in the tooth width direction and the inner surface 75a of the right side wall 75 of the case 70 and the inner surface 75a of the fourth gear 44, To the gap 77 between the side surfaces 44a of the teeth. The lubricating oil 66c that has flowed into the clearance 77 gradually rises (rises) as the fourth gear 44 rotates. The lubricating oil 66c gradually flows from the gap enlarging portion 95 to the oil passage 81 and is led to the first shaft second bearing 52 through the oil hole 84 and the oil cone portion 83 . In this way, the lubricant 66c stored in the case 70 can be efficiently supplied to the second bearing 52 for the first shaft.

Furthermore, the flow path 81 is open at the top. The gap enlarging portion 95 is positioned just above the flow path 81. It is possible to surely and efficiently receive the lubricating oil 66 which has gradually entered the gap enlarging portion 95 through the oil passage 81 immediately below the gap increasing portion 95.

The transmission device (13) of the present invention is suitable for mounting on a walking tiller.

10: Working machines (cultivators)
13: Power transmission
14:
30: power transmission mechanism
31: 1st axis
43: Third gear (lower gear)
44: disk-shaped rotating body (lower gear, fourth gear)
44a: side surface of the disk-shaped rotating body (side surface of the fourth gear)
52: Bearing (second bearing for first shaft, lubrication part)
66: Lubricant
66a: Oil level
70: Case
71: Case body
72: Top surface
75a: the inner surface of the side wall of the case
77: Clearance
81: Euro
83: Oyster blocker
84: Oil hole
91: Lead
92:
93: Flange
95:

Claims (4)

A transmission mechanism including a disk-shaped rotating body for transmitting power is housed inside the case,
Lubricating oil is stored in the bottom of the case,
Wherein the disk rotating body is rotatably supported by the case by a shaft and a bearing for supporting the shaft,
Between the inner surface of the side wall of the case and the side surface of the disk-shaped rotating body, a gap and a gap enlarging portion enlarged in size of the gap are formed,
The gap is set to such a size as to enable the lubricant to be slowly lifted up between the inner surface of the side wall of the case and the side surface of the disk rotating body by rotating the disk rotating body,
Wherein the gap enlarging section is located higher than the oil level of the lubricating oil stored in the case and communicates with the oil passage when the transmission device is in the used state. The electronic apparatus according to claim 1,
A case body having an open top surface,
A lid covering the upper surface;
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And the gap enlarging portion is formed on the lead. 2. The automatic transmission according to claim 1, wherein the disk-like rotary body is constituted by an upper gear located higher than the oil level of the lubricating oil stored in the case when the transmission is in the used state,
The lower gear is housed in the case, the lower gear being located lower than the upper gear and meshing with the upper gear,
Wherein at least a part of the teeth of the lower gear is immersed in the lubricating oil stored in the case. 4. The air conditioner according to any one of claims 1 to 3,
And the gap enlarging portion is located directly above the oil passage.

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