JPS643847Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is applicable to cylinder blocks, balancer cases,
A lubricating oil seal in a lubricating oil supply mechanism in which a rotating shaft is supported via a bush in a case-like member such as a gear case, and lubricating oil is supplied to the bush through a passage provided within the wall thickness of the case-like member. Regarding structure.

(Prior Art) Conventionally, in this type of lubricating oil supply mechanism, a long lubricating oil supply passage (hole) extending approximately the entire vertical or horizontal length of the case-like member is formed within the wall thickness of the case-like member. A support hole whose center line is substantially perpendicular to the center line of the passage is provided in the middle of the passage, and the rotary shaft is supported in the support hole via a bush. An annular groove is provided on the outer periphery of the rotating shaft in the bush, and a pair of holes are formed in the bush to communicate the annular groove with passages on both sides of the rotating shaft, and the terminal end of the passage, that is, the opening of the passage is formed in the bush. A blind plug was fitted to prevent lubricating oil from leaking.

However, in that case, a blind plug is required at each end of the passage, increasing the number of blind plugs.
Further, the mechanism of the blind plug requires time and effort, and when the blind plug protrudes from the case-like member, there is a problem that it interferes with an adjacent member.

(Purpose of the invention) As described above, the present invention aims to reduce the number of blind plugs and the number of machining steps for installing the blind plugs in a lubricating oil supply mechanism.

(Structure of the invention) The present invention includes a plurality of shaft support holes 41 and 42 parallel to each other within the wall thickness of the case, and supports the shafts 10 and 11 in each shaft support hole 41 and 42 via bushes 7 and 8, 1 that passes through all the shaft support holes 41 and 42 at right angles.
The tip of the book passage 24 is connected to the lubricating oil supply passage 26 in the case within the thickness of the case, and each bush 7,
8 are provided with radial holes 32, 37, 38 that connect the passage 24 and the annular grooves 31, 36 on the shaft. This lubricating oil seal structure is characterized in that by not providing a radial hole, the bush in that part also serves as a blind plug at the end of the passage.

(Example) The present invention will be explained by taking a lubricating oil supply mechanism in a balancer case as an example. FIG. 1 is a partially cutaway front view of an engine including a balancer device. In the figure, a cylinder block 1 supports a crankshaft 2 via a bush (not shown). The crankshaft 2 is provided with a crank pin 4 parallel to the shaft 2 via a disc-shaped crank arm 3.
A drive gear 5 is provided on the outer periphery of the crank arm 3. 6 is a balancer case, and the case 6 is fixed to the lower surface of the cylinder block 1 with bolts 9. Buttons 7 and 8 are in the balancer case 6.
A pair of balancer shafts 10 and 11 are supported via a (metal bearing) and another pair of bushes to be described later. A driven gear 14 is fixed to the small diameter end 12 of the balancer shaft 10 by a nut 13, and the driven gear 14 meshes with the drive gear 5. A vertical lubricating oil supply passage 15 is provided within the wall thickness of the balun case 6, and the passage 15 communicates with a passage 16 within the wall thickness of the cylinder block 1. 1
Reference numeral 7 denotes an oil pan, and the oil pan 17 is fixed to the lower surface of the cylinder block 1 from the outside of the balancer case 6 with bolts 18. oil pan 17
A lid 19 is attached to the. 21 is a strainer.

In FIG. 2, which is a bottom view of the balancer case 6 including the - cross section of FIG.
A further pair of bushings 22, 23 are provided for supporting the balancer shafts 10, 11. A pair of lubricating oil supply passages 24 and 25 parallel to each other are provided within the wall thickness of the case 6 from the left side of FIG. Support holes 41, 42, 4
3 and 44 respectively, three parts 24a and 2
It is divided into 4b, 24c and 25a, 25b, 25c. The center line of each support hole is the passage 24, 25
The bushes 7, 8, 22, 23 are supported by these support holes. Further, within the wall thickness of the case 6, there is a lubricating oil supply passage 2 which is perpendicular to both the passages 24 and 25 and which communicates with the passages 24 and 25.
6 is provided from the bottom side in FIG. 2, and this passage 26 communicates with the aforementioned passage 15 at right angles. As shown in the enlarged partial view, a blind plug 28 is fitted in the terminal end of the passage 26, that is, the large diameter opening 27, as in the prior art.

In FIG. 2, the large diameter portion 30 of the balancer shaft 10 is provided with an annular groove 31, and the bush 7 is provided with a radial hole 32 for communicating the annular groove 31 with the portion 24b of the passage 24. On the other hand, the annular groove 31 and the portion 24a of the passage 24, that is, the terminal end (opening) of the passage 24 are blocked by the bush 7 and do not communicate with each other. This also applies to the annular groove 34 provided in the large diameter portion 33 of the balancer shaft 10 in the bush 22 and the portion 25a of the passage 25. This point is the key point in this invention.

The large diameter portion 35 of the balancer shaft 11 is provided with an annular groove 36, and the bush 8 is provided with a pair of radial holes 37, 38 for communicating the annular groove 36 with the portions 24b, 24c of the passage 24, as in the conventional case. ing. Large diameter part of balancer shaft 11 and bush 2
The structure of No. 3 is also similar. Note that gears 39 and 40 are attached to the ends of both balancer shafts 10 and 11, and the gears 39 and 40 are in mesh with each other.

When the crankshaft 2 in FIG. 1 rotates, its rotational force is transferred to the balancer shaft 10 via the gears 5 and 14, and the rotational force of the balancer shaft 10 is transferred to the balancer shaft 11 via the gears 39 and 40 in FIG. communicated. In FIG. 1, an oil pump (not shown) sucks up lubricating oil (not shown) in an oil pan 17 through a strainer 21,
The lubricating oil is supplied to each part of the engine. A portion of it descends within passages 16, 15 and reaches passage 26 in FIG. A portion of the lubricating oil in passage 26 is transferred to passage 2.
4 through the annular groove 3 and the radial hole 37.
6, and further reaches the annular groove 31 from the annular groove 36 via the radial hole 38, the portion 24b, and the radial hole 32. The lubricating oil in the annular groove 31 is blocked (sealed) by the bush 7 and does not leak toward the terminal end 24a of the passage 24. Further, the remaining part of the lubricating oil in the passage 26 reaches the annular groove 34 in the same manner as described above.
The lubricating oil in the annular groove 34 is reliably blocked by the bush 22.

The present invention can be applied to any case-like member such as a gear case in which a rotating shaft is supported via a bush.

(Effect of the invention) According to the invention, a rotating shaft (for example, balancer shaft 10, 11) is installed in the middle of a lubricating oil passage (for example, passage 24, 25) provided in a case-like member (for example, balancer case 6 in FIG. 2). If there is a bearing part, the end part of the passage (for example, the end part 24a, 2
In 5a), there is no need to fit a blind plug, and the number of blind plugs can be reduced. This saves the effort of installing the blind plug, and prevents the blind plug from protruding from the case-like member and interfering with adjacent members (for example, the oil pan 17).

Furthermore, in the present invention, a plurality of parallel support holes 4 are provided.
Lubricating oil can be supplied to the sliding surfaces between the bushes 7, 8 and the shafts 10, 11 in the shafts 1, 42 through one passage 24 perpendicular to the support holes 41, 42. That is, the passage 24 can be formed by a cut hole opened from the left side in FIG. and annular grooves 31, 3 on the shafts 10, 11
6 are radius holes 32, 37 provided in the bushes 7, 8;
38, so lubricating oil can be supplied to two or more bearing parts with one oil hole 24, simplifying the man-hours for drilling holes and the passage structure, and the passages 24 are formed by drilling holes. At this time, if the tip of the passage 24 is connected to the passage 26 within the wall thickness of the case 6, a blind plug can be omitted on the side where it connects to the passage 26. Since the part of the bushing 7 facing the remote passage section 24a is not provided with a radial hole, the bushing 7 plays the role of a blind plug, and if the passage 24 is drilled, the part of the bushing 7 that is open to the atmosphere (part 24a), the bush 7 can also be used as a blind plug, which was conventionally required. Furthermore, according to the present invention, even if there are three or more bearing parts, one long passage 2
By simply drilling a hole in 4 and not providing a radius hole in the bush 7 facing the atmosphere open side portion 24a, the passage 2
The blind plugs at both ends of 4 are omitted, and passage portions 24b, 24c, radial holes 32, 37, 3 are provided in the middle of each bearing.
8. There is an advantage that lubricating oil can be smoothly supplied through the annular grooves 31 and 36.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of an engine employing the present invention, and FIG. 2 is a bottom view including the cross-section shown in FIG. 6... Balancer shaft case (an example of a case-like member), 7, 8, 22, 23... Bush, 10,
11... Balancer shaft (an example of a rotating shaft), 24,
25...Aisle.

Claims (1)

[Scope of utility model registration request] A plurality of shaft support holes 41, 4 parallel to the case wall thickness
2, and a bush 7, in each shaft support hole 41, 42.
One passage 2 that supports the shafts 10, 11 through the shafts 8 and passes through all the shaft support holes 41, 42 at right angles.
4 is connected to the lubricating oil supply passage 26 inside the case within the wall thickness of the case, and the passage 2 is connected to each bush 7, 8.
4 and the radial hole 3 connecting the annular grooves 31 and 36 on the shaft.
2, 37, and 38 are provided, and the lubricating oil supply passage 2
The end portion 24a of the air-opening side passage farthest from 6
A seal structure for lubricating oil characterized in that by not providing a radial hole only in the bushing part facing the passage, the bushing in that part also serves as a blind plug at the end of the passage.