JPH0634564Y2 - Engine lubricator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a lubricating device for lubricating a bearing surface of a balancer shaft or a cam shaft of an engine.

[Prior Art] Conventionally, as a lubricating device of this type, the lubricating oil accumulated in the lower part of the engine is splashed upward by the rotation of a gear or the like to generate an oil mist, and the oil mist is used to generate the oil mist. It is known to lubricate the bearing surface of the balancer shaft or the cam shaft located at the upper part (for example, in Japanese Utility Model Laid-Open No. 55-6
See 9106). An example of this type of lubricating device is shown in FIG.

In FIG. 4, reference numeral 1 is a vertical shaft type engine, and a crankshaft 2
The axial direction S of the balancer shaft 3 is set up and down. The crankcase 4 that houses the crankshaft 2 and the balancer shaft 3 is composed of a crankcase body 5 through which the crankshaft 2 penetrates and a cover 6. The journal portion 2a of the crankshaft 2 is pivotally supported by the bearing portion 5a of the crankcase body 5, while the journal portion of the balancer shaft 3 is supported.
3a is pivotally supported by a bearing portion 5b of the crankcase body 5.

Inside the crankshaft 2, there are a journal portion 2a and a bearing portion.
An oil passage 13 communicating with the first bearing surface 10 is formed between the first and second bearing surfaces 5a, and lubricating oil from an oil pump (not shown) is pumped to the first bearing surface 10 through the oil passage 13. On the other hand, a groove 8 extending in the axial direction S is formed in the bearing portion 5b of the balancer shaft 3, and a crank chamber 9 is formed through the groove 8.
The oil mist therein enters the second bearing surface 11 between the journal portion 3a and the bearing portion 5b, whereby the bearing surface 11 of the balancer shaft 3 is lubricated. 14 is an oil seal,
15 is a balancer shaft weight.

[Problems to be Solved by the Invention] However, in the above-described splash type lubrication device, for example, the bearing surface 11 of the balancer shaft 3 located above the vertical shaft type engine 1 cannot be forcibly lubricated, Therefore, it cannot be lubricated sufficiently.

Therefore, it is possible to insert a bearing member such as a bearing between the balancer shaft 3 and the bearing portion 5b.
In this case, the number of parts increases and the cost increases.

Such inconvenience occurs not only in the balancer shaft 3 but also in the cam shaft (not shown). It should be noted that the balancer shaft 3 has a larger load because the weight 15 is formed integrally with the balancer shaft 3 as compared with the cam shaft, and thus requires more sufficient lubrication.

The present invention has been made in view of the above problems, and an object thereof is to provide an engine lubrication device capable of forcibly lubricating the bearing surface of the balancer shaft or the cam shaft without increasing the number of parts.

[Means for Solving the Problems] In order to achieve the above object, the present invention extends the balancer from a first bearing surface of a crankshaft to a second bearing surface on which a balancer shaft or a camshaft is axially supported. An oil groove that guides lubricating oil to the shaft or cam shaft is provided on the mating surface between the crankcase body and the cover.

[Operation] According to the present invention, the mating surface between the crankcase body and the cover is provided with an oil groove extending from the first bearing surface of the crankshaft to the second bearing surface of the balancer shaft or the camshaft. Part of the lubricating oil pumped to the bearing surface of
It is guided to the second bearing surface of the balancer shaft or the cam shaft through the oil groove and is forcibly lubricated.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view showing an embodiment of the present invention, in which a crankcase 4 is joined to the crankcase body 5 which pivotally supports the crankshaft 2 and the crankshaft. Cover 6 through which 2 penetrates
And an oil pan 50. A trochoidal type oil pump 20 for pumping lubricating oil to an oil passage 13 in the crankshaft 2 is arranged below the vertical shaft type engine 1.

The discharge port 27 of the oil pump 20 communicates with a first oil passage (not shown) formed in the oil pan 50. The first oil passage is provided with a crank pin 6 through a second oil passage 13a in the crankshaft 2 and an oil hole 51.
Communicating with the sliding part between 0 and the controller (not shown),
Further, the fifth and third oil passages 13b and 13c communicate with a fifth oil passage 13d formed in an annular shape in the bearing portion 5a of the crankcase body 5. Through the fifth oil passage 13d, the lubricating oil is pressure-fed to the first bearing surface 10 between the crankshaft main body 5 that supports the crankshaft 2 and the crankshaft 2.

On the other hand, the mating surface 30 between the crankcase body 5 and the cover 6 extends from the first bearing surface 10 of the crankshaft 2 to the second bearing surface 11 of the balancer shaft 3 as shown in FIG. An oil groove 31 for guiding lubricating oil is linearly provided on the second bearing surface 11. The inlet end 31a of the oil groove 31 of FIG. 3 and the fifth oil passage 13d are formed so as to be separated from each other in the axial direction S,
The first bearing surfaces 10 communicate with each other.

Further, the outlet end 31b of the oil groove 31 communicates with the circular recess 52 for escape. The recess 52 is a first portion extending in the axial direction S formed in the bearing portion 5b of the crankcase body 5.
Through the oil discharge groove 33 and the second oil discharge groove 34 formed in the flange surface 5c of the bearing portion 5b and extending in the radial direction R. The arrows indicate the flow of oil. The balancer shaft 3 has a driven gear 40 integrally formed as shown in FIG.
It is linked to the crankshaft 2 via 41. The weight 15 of the balancer shaft 3 is rotated by the balancer shaft 3 in the same cycle as that of the crankshaft 2, and the centrifugal force of the weight 15 causes the engine 1 to rotate.
Plays a role of eliminating the inertial force (primary vibration) of.

In the case of this embodiment, the cover 6 shown in FIG. 1 seals the coolant for cooling the cylinder 70 of the engine 1 and the crankcase body 5 with the crankcase body 5. Further, 42 is a cooling fin integrally formed on the crankcase 4, and 43 in FIG. 2 is a rotary plate having a large number of air holes 44, which are rotated integrally with the crankshaft 2. Other configurations are the same as in the example of FIG. 4, and the same portions or corresponding portions will be denoted by the same reference numerals and detailed description thereof will be omitted.

Next, the operation of the above configuration will be described.

The lubricating oil from the discharge port 27 of the oil pump 20 shown in FIG. 1 is supplied to the first oil passage in the oil pan 50 and the crankshaft 2.
It is pumped to the sliding portion between the crank pin 60 and the rotor through the second oil passage 13a and the oil hole 51, and also through the third to fifth oil passages 13b.13c.13d. Then, it is pressure-fed to the first bearing surface 10 and the bearing surface 10 is lubricated over the entire circumference.

The remainder of the lubricating oil pumped to the first bearing surface 10 is
As shown by the arrow A in the figure, the oil groove from the first bearing surface 10
It passes through the inside of 31 and is pumped to the second bearing surface 11, and this bearing surface
11 is forcibly lubricated. After that, the lubricating oil in the second bearing surface 11 returns to the crank chamber 9 from the recess 52 in FIG. 3 through the first and second oil discharge grooves 33, 34. In this way, the bearing surface 11 of the balancer shaft 3 can be forcibly lubricated,
The lubricity of the balancer shaft 3 is significantly improved as compared with the conventional lubrication with oil mist.

Here, the mating surface 30 between the crankcase body 5 and the cover 6
In addition, since the oil groove 31 extending from the first bearing surface 10 to the second bearing surface 11 is provided, it is not necessary to separately provide a bearing member such as a ball bearing on the balancer shaft 3, so that the number of parts is increased. Therefore, the cost can be reduced.

By the way, in a crankcase not having the cover 6, if a hole corresponding to the oil groove 31 is to be machined, a deep hole is formed from the outside of the crankcase using a tool such as a drill, and It is necessary to close one end of the deep hole. On the other hand, in the present invention, since the oil groove 31 is formed in the mating surface 30 between the crankcase body 5 and the cover 6, there is no need for machining or the above-mentioned deep hole machining. Is easy.

By the way, in this embodiment, the annular fourth oil passage 13
Since d is separated from the inlet end 31a of the oil groove 31 in the axial direction S, it is possible to prevent a large amount of the lubricating oil supplied into the fourth bearing surface 13d from flowing into the oil groove 31. . Therefore, there is no possibility of impairing the lubricity of the first bearing surface 10 of the crankshaft 2.

Further, the bearing portion 5b of the balancer shaft 3 is formed with the first and second oil discharge grooves 33, 34 which are continuous with the recess 52, so that the lubricating oil can be easily discharged, and the second bearing surface 11 can be easily discharged. The forced lubrication is smooth.

Although the balancer shaft 3 has been described in the above embodiment, the oil groove 31 (FIG. 1) may be communicated with the bearing surface of the cam shaft (not shown) instead of the balancer shaft 3.

Although the oil groove 31 is formed in the crankcase body 5, the oil groove 31 may be formed in the cover 6 or the gasket 55 between the both 5, instead of this.

Further, the lubricating oil from the discharge port 27 of the oil pump 20 first lubricates the first bearing surface 10 through the oil passage and then flows into the oil passages 13c, 13b, 13a. A structure in which the oil flow is different may be used.

[Effects of the Invention] As described above, according to the present invention, an oil groove is provided on the mating surface between the crankcase body and the cover to forcibly lubricate the bearing surface of the balancer shaft or the camshaft. The lubricity of the camshaft is improved, and since it is not necessary to separately provide a bearing member as in the related art, the number of parts can be reduced and the cost can be reduced.

[Brief description of drawings]

1 is a sectional view showing an engine to which a lubricating device according to an embodiment of the present invention is applied, FIG. 2 is a partially sectional plan view taken along line II-II of FIG. 1, and FIG. FIG. 4 is a sectional view taken along line III-III in FIG. 4, and FIG. 4 is a sectional view showing an example of a lubricating device not included in the present invention. 2 ... Crank shaft, 3 ... Balancer shaft, 4 ... Crank case, 5 ... Crank case body, 5b ... Bearing part, 6
...... Cover, 10 ...... First bearing surface, 11 ...... Second bearing surface, 13 ...... Oil passage, 20 ...... Oil pump, 30 ...... Mating surface, 31 ...... Oil groove

Claims (1)

[Scope of utility model registration request] 1. A cover, which is joined to a crankcase body that pivotally supports a crankshaft and through which the crankshaft penetrates, and a cover between the bearing and the crankshaft in the crankcase body that pivotally supports the crankshaft. An oil passage for guiding lubricating oil to the first bearing surface, a second bearing surface for supporting a balancer shaft or a cam shaft, and an oil pump for pumping lubricating oil to the oil passage, and the cover and crankcase. A lubricating device for an engine, wherein an oil groove extending from the first bearing surface to the second bearing surface and guiding lubricating oil to the balancer shaft or the cam shaft is provided on a mating surface with the main body.