JPH0533703Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an engine having a balancer shaft, and the balancer shaft is disposed within a lubricating oil chamber to make the engine more compact.

<Prerequisite structure> The engine having the balancer shaft of the present invention has the following prerequisite structure, as shown in FIGS. 1, 2, 5, or 6 and 7, for example. set to target.

That is, the balancer shafts 7 and 8 are arranged in a lubricating oil chamber 6 formed in the lower part of the crank room 2, and a partition wall 12 is used to partition a balancer rotation space 10 in the lubricating oil chamber 6 and a space 11 around it. It has been set up and configured.

This prerequisite structure has the following advantages.

The overall height of the engine can be reduced by raising the lubricating oil chamber 6 to the height of the balancer rotation space 10.

Moreover, the lubricating oil in the lubricating oil chamber 6 is prevented from being violently hit by the balancer shafts 7 and 8, and early deterioration due to an increase in oil temperature can be prevented.

<Prior Art> In the above-mentioned prerequisite structure, the structure of the partition wall 12 is as follows in the prior art.

◎Prior art 1 See Fig. 5 Japanese Utility Model Application No. 57-127942 Front rotation space 10 of front weight 7a of balancer shaft 7
Only part a is covered with the partition wall 12, but its rear weight 7b
The rear rotating space portion 10b of the vehicle is not covered at all.

Between the balancer gear 51 fixed to the balancer shaft 7 and the partition wall 12, there is a gap 52 for avoiding friction. The upper surface of the front rotating space 10a is closed to the crank room 2 by the upper half of the partition wall 12.

◎Prior art 2 See Fig. 6 and Fig. 7 Japanese Utility Model Application Publication No. 116739/1983 Front and rear end walls 62, 6 of the crankcase 61
3, the front and rear opening edges 64 and 65 of the partition wall 12 are brought into close contact to prevent the lubricating oil in the lubricating oil chamber 6 from entering the balancer rotation space 10.

The upper surface of the balancer rotation space 10 is open toward the crank room 2.

〈Problem that the idea aims to solve〉 The above conventional technology has the following problems.

◎Prior art 1 See Fig. 5 (a) Early deterioration of lubricating oil The lubricating oil in the lubricating oil chamber 6 is violently hit in large quantities by the rear weight 7b, so the oil temperature rises abnormally and deteriorates early.

Note that the lubricating oil that has entered the front rotating space 10a from the sliding gap 52 for preventing sliding contact is only struck by the front weight 7a and rotates within the closed front rotating space 10a. The oil is not smoothly supplied into the crank room 2 in the form of oil droplets.

◎Prior art 2 See Figures 6 and 7 (b) Oil droplet lubrication in the crank room is not possible The lubricating oil in the lubricating oil chamber 6 is contained in the balancer rotation space 1.
Since the oil does not flow into zero, it is not hit by the balancer shafts 7 and 8 and turned into oil droplets, and the inside of the crank room 2 cannot be smoothly lubricated with this oil droplet.

The present invention aims to eliminate early deterioration of lubricating oil and provide oil droplet lubrication inside the crank room.

<Means for Solving the Problems> In order to solve the above problems in the above-mentioned premise structure, the present invention combines the following characteristic structures as shown in FIGS. 1 and 2, for example. shall be.

That is, the partition wall 12 is provided with a communication passage 17 that communicates the balancer rotation space 10 with the surrounding space 11, and the upper surface of the balancer rotation space 10 is opened toward the crank room 2. shall be.

<Effect> The present invention works as follows.

Since the lubricating oil in the lubricating oil chamber 6 flows little by little into the balancer rotation space 10 from the communication passage 17, it is beaten by the balancer shafts 7 and 8 and becomes fine oil droplets, which flow smoothly into the crank room 2. The rotation of the balancer shafts 7 and 8 is used to properly lubricate each lubricating part in the crank room 2 with oil droplets.

<Effects of the invention> Since the present invention is constructed and operates as described above, it is possible to achieve both the following effects (a) and (b).

(b) Eliminate early deterioration of lubricating oil Since the lubricating oil in the lubricating oil chamber only flows into the balancer rotation space from the communication path little by little, it will not be hit violently by the balancer shaft in large quantities, and the oil temperature will not rise abnormally. This can eliminate the problem of premature deterioration.

(b) The balancer shaft enables oil droplet lubrication of the crank room.The lubricating oil in the lubricating oil chamber flows little by little into the balancer rotation space from the communication path, so it is beaten by the balancer shaft and finely turned into oil droplets. The oil is smoothly supplied into the crank room, and by using the rotation of the balancer shaft, each lubricating part in the crank room can be well lubricated with oil droplets.

<Example 1> Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2.

FIG. 1 is a longitudinal sectional front view showing the main parts of an engine according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional side view thereof.

A crank room 3 is located inside the crank case 2, which is integrally cast with the engine's cylinder block 1.
is formed. A crankshaft 4 and a valve drive camshaft 5 are disposed in the upper part of the crank room 3, and a lubricating oil chamber 6 is formed in the lower part of the crank room 3. A pair of balancer shafts 7 and 8 are arranged side by side in the lubricating oil chamber 6. Each balancer shaft 7, 8 is connected to the crankshaft 4 via a gear device 9 (only the pitch circle of each gear is shown) disposed in the crank room 3.
is linked to.

A partition wall 12 is provided in the lubricating oil chamber 6 to partition a balancer rotation space 10 in which the balancer shafts 7 and 8 rotate and a space 11 around the balancer rotation space 10 . This partition wall 12 extends from the end wall 13 of the crankcase 2 on the side opposite to the side where the gear device 9 is disposed to the vicinity of the end face of each gear 14, 15 fixed to the balancer shafts 7, 8 of the gear device 9. A communication passage 17 is formed between the end edge 16 of the partition wall 12 and each of the gears 14 and 15 to communicate the balancer rotation space 10 with the space 11 around it. The upper surface of the balancer rotation space 10 is open toward the crank room 2.

An oil strainer 18 of a main lubricating device (not shown) is disposed at the bottom of the lubricating oil chamber 6, and the lubricating oil 19 in the lubricating oil chamber 6 is passed through this oil strainer 18 by an oil pump (not shown). It is pumped up and supplied to various parts of the engine under pressure.

In the engine having the balancer shaft configured as described above, the balancer rotation space 10 is connected to the partition wall 12.
Since the lubricating oil stored in the space 11 around the balancer rotation space 10 is separated from the surrounding space 11 by Compared to an engine having a conventional balancer shaft without a bulkhead 12, the lubricating oil stirring effect caused by the rotation of the balancer shafts 7 and 8 is significantly attenuated, and the temperature rise of the lubricating oil is reduced. In this way, as a result of being able to reduce the increase in oil temperature due to the rotation of the balancer shafts 7 and 8,
8 in the lubricating oil chamber 6, the engine can be made compact.

On the other hand, the lubricating oil that has flowed into the balancer rotation space 10 through the communication passage 17 is splashed up into the crank room 3 by the rotation of the balancer shafts 7 and 8, and is splashed up into the crank room 3, such as the crank shaft 4, the cam shaft 5, the lower part of the cylinder, etc. Since it adheres to and lubricates these parts, insufficient lubrication of these parts can be more reliably prevented.

In the above embodiment, a pressure feed type lubrication device is provided as the main lubrication device, but instead of such a main lubrication device, droplets of lubricant splashed up by the balancer shafts 7 and 8 lubricate various parts of the engine. It is also possible for the lubricating device to be the main lubricating device.

<Embodiment 2> In another embodiment of the present invention shown in FIG. 3, the balancer shafts 7, 8 of the gear device 9 in the above embodiment
A communication path 1 is provided on the end face of each gear 14, 15 fixed to the
A plate-shaped opening limiter 20 that limits the opening area of the opening 7 is provided. The rest of the structure is similar to that of the above embodiment.

In this embodiment, the opening area of the communication path 17 is restricted by the opening limiter 20, and the balancer rotation space 10 is
It is possible to limit the amount of lubricating oil flowing into the As a result, it becomes possible to reduce the amount of oil stirred by the balancer shafts 7, 8 and further reduce the temperature rise of the lubricating oil.

<Example 3> In another example of the present invention shown in FIG.
The partition wall 12 is divided into three parts. That is, the partition wall 12 is a fixed partition wall 1 extending toward the gear device 9 from an end wall 13 of the crankcase 2 on the opposite side to the side where the gear device 9 is disposed.
2a and each gear 1 fixed to the balancer shafts 7 and 8
Balancer shafts 7, 8 fixed to the end faces of 4, 15
and a pair of movable partition walls 12b coaxially in the shape of a rotating body, and the communication path 17 is connected to the fixed partition wall 1.
2a and the movable partition wall 12b. The rest of the structure is similar to each of the above embodiments.

In this case, the movable partition wall 12b is connected to the balancer shaft 7,
Since the movable partition wall 12b is formed in the shape of a rotating body coaxial with the partition wall 8, the lubricating oil agitation effect due to the rotation of the movable partition wall 12b is very small and has almost no effect on the rise in oil temperature, and the oil temperature rise due to the installation of the partition wall 12 is very small. The prevention function is not impaired.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing the main parts of an engine according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional side view thereof,
FIG. 3 is a longitudinal sectional side view showing the main parts of an engine according to another embodiment of the present invention, and FIG. 4 is a longitudinal sectional side view showing the main parts of an engine according to another embodiment of the invention. FIG. 5 is a longitudinal sectional side view of the main part inside the crankcase according to Prior Art 1, FIG. 6 is a longitudinal sectional front view inside the crankcase according to Prior Art 2, and FIG.
FIG. 2 is a vertical sectional side view of the main part of the figure. 2... Crank room, 6... Lubricating oil room, 7,
8... Balancer axis, 10... Balancer rotation space,
11... Space around the balancer rotation space 10, 1
2... Bulkhead, 17... Communication passage.

Claims (1)

[Claim for Utility Model Registration] Balancer shafts 7 and 8 are arranged in a lubricating oil chamber 6 formed in the lower part of the crank room 2, and a balancer rotation space 10 in the lubricating oil chamber 6 and a space 11 around it. In an engine having a balancer shaft configured by providing a partition wall 12 for partitioning the space, the partition wall 12 is provided with a communication passage 17 that communicates the balancer rotation space 10 with the surrounding space 11, and the upper surface of the balancer rotation space 10 is provided. An engine having a balancer shaft, characterized in that the balancer shaft is configured to be open towards a crank room 2.