JPS6321312A - Lubricating device for engine with balance shaft - Google Patents

Abstract

PURPOSE:To make an engine in a compact size by offsetting the bearing portion of a balance shaft having an auxiliary equipment attached thereto, in the longitudinal inward direction of an engine, opposite to the other side balance shaft and by providing a passage for lubricating chains at the portion of lubricating oil passage connected to both bearing portions. CONSTITUTION:Balance shafts 3, 4 driven by a crank shaft through sprockets 9, 10 and chains are provided at both side of a cylinder block 1. The bearing portion 3a of the balance shaft 3 having an auxiliary equipment 14 such as an oil pump arranged thereto is offset in the longitudinal inward direction of an engine in comparison the other bearing portion 4a of the balance shaft 4. Passages 26a, 26b for supplying oil to each of bearing portion 3a, 4a cross the longitudinal direction of an engine at right-angles so as to be connected thereto, by an offset amount, in the longitudinal direction of the engine and an oil jet nozzle 30 for lubricating the chains is connected to the tip end of the connecting portion.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an engine lubricating device in which balancer shafts are disposed on both sides of a cylinder block, and one of the balancer shafts is provided with an operating part of an auxiliary machine. It is something.

(Prior Art) Conventionally, as shown in, for example, Japanese Utility Model Publication No. 58-13166, in order to balance the inertia force of the engine, a cylinder cylinder [1 cylinder block] is constructed of a chain or the like on each side on each side. A balancer shaft is provided that is interlocked with the crankshaft via a drive mechanism, and an operating part of an auxiliary machine is provided at the end of one of the balancer shafts on the drive mechanism side, for example, one of the oil pumps is provided. Accordingly, there is a known engine in which the balancer shaft is also used as a gear shaft of an oil pump to simplify the structure.

In such engines, auxiliary equipment such as an oil pump is attached to the outside of the bearing that supports one of the balun shafts 1 to 1 on one end of the cylinder block. Since the engine protrudes from the engine and the drive mechanism is installed outside of this, the total length of the engine including the cylinder block, the auxiliary equipment, and the drive mechanism increases.

Therefore, in order to shorten the overall length of one engine, it is desirable to reduce the amount of protrusion of the auxiliary equipment from the cylinder bush. To do this, it is possible to recess the end of the cylinder block in the part where the auxiliary equipment can be accessed, but in this case, the bearing part on one end side that weighs against one balancer shaft and It is necessary to change the positional relationship with the bearing part on the one end side.

However, the above bearing parts need to be lubricated with oil, and as a lubrication system, a passage for supplying oil to both bearing parts is formed in a white line shape in a direction perpendicular to the longitudinal direction of the engine. Since this passage must correspond to each bearing part, the arrangement of the bearing parts is restricted. For this reason, conventionally it has been difficult to shorten the engine as described above while keeping the lubrication system relatively simple in structure.

(Object 1-1 of the invention) In view of the above circumstances, the present invention secures the lubricity of each bearing part for both balun υ shafts, and relatively easily connects the oil passage to ILI. To provide an 811 sliding ring for an engine with a balancer shaft, which can shorten the overall length of the engine by reducing the amount of protrusion of auxiliary equipment from one cylinder tab.

(Structure of the Invention) In the present invention, balancer shafts are arranged on both sides of the cylinder block, and a chain is used outside one end of the cylinder tab 171 to interlock each balancer shaft with the crankshaft. Equipped with a drive mechanism and one balancer shaft with a balancer shaft 1? In the first engine, set the bearing part for the balancer shaft of the drive mechanism side end of the cylinder tab [1] inward in the longitudinal direction of the engine than the bearing part for the other balancer shaft. In the passage for supplying oil to each of the above-mentioned bearing parts, a passage part leading to one bearing part and a passage part leading to the other bearing part are arranged so as to be perpendicular to the longitudinal direction of the engine and A chain lubrication passage is provided which is offset in the longitudinal direction of the engine by the amount of the offlet, and which is perpendicular to both passages and whose tip is open toward the chain.

In other words, the bearing parts are arranged so that the amount of protrusion from the cylinder block of the auxiliary equipment located outside of one bearing part is small, and both passages are formed to correspond to the arrangement P1 of each bearing part. In addition, the passage that connects both passage portions is used as a chain lubrication passage.

(Example) Figures 1 to 3 show specific examples of an engine with a balancer shaft equipped with the lubricating device of the present invention. The crankshaft 2 is attached to the center of the width, and balancer shafts 3.4 are attached to both sides. Each of the balancer shafts 3.4 has journal portions 38 to 3c, 4a to 4C at a plurality of locations, as well as eaves and eccentric portions 3d, 4d, and each of the journal portions 3a to 3C 14a to 4c has It is supported by bearing portions 5a to 5c and 6a to 6C formed in the cylinder block 1 via pushers 17, respectively. - A transmission mechanism for interlocking the balancer shafts 3 and 4 with the crankshaft 17 is provided outside one end (front end) of the cock 1 of the cylinder valve 1.

As shown in Fig. 3, this transmission mechanism consists of a sprocket 8 attached to the crankshaft 2, a sprocket 9 attached to the balancer shaft 3 at -'tJ (on the right side of the figure), The other (left side in the figure) balancer shaft 4
Installed on [Gear 10 that was broken, this one! This transmission mechanism consists of a sprocket 12 attached to a shaft 11 to the right of a gear A7 that meshes with Al10, and a chain 13 that is passed around each sprocket 8°9.11. The balancer shuts 3 and 7I are linked to the crankshaft 2 so that they rotate in the opposite direction at twice the number of revolutions of the crankshaft 20.
゜Also, the drive shaft side end of one of the balancer shuts 3 is provided with a shaft part of an auxiliary machine, and in this embodiment, an oil pump 14 with 7 pumps is provided as the auxiliary machine. Drive S of this oil pump 14! t 15 is the journal portion 3a at one end side of the balancer 1 foot 3
and sprocket 9 (by being pulled, 1-3 is attached to the part between oil pump 1 and sprocket 9)
It also serves as the 4th gear shaft.

On the front end side of the cylinder block 1 equipped with the drive mechanism and the oil pump 14, the bearing part 5ac supporting the journal part 3a of the balun 1 and throat 3 of ``]-h and the journal of the other balun 1 and the throat 4 of the other balun 1 are connected to each other. Part 4
The four parts 1a are offset inward in the longitudinal direction of the engine from the bearing part 6a that supports the bearing part 6a, and the curved surface of the cylinder block 1 at this part is formed with four parts 1a that are recessed by the offset amount. Since the oil pump 14 is attached to the location where the recess 1a is formed, the protrusion of the oil pump 14 from the front end of the cylinder tab 1 is made smaller by the offset.

As shown in FIGS. 4 and 6, the oil pump 14 is connected to the drive gear rt 15 and the drive l! The pump body 17 is made of aluminum 16, has a pump body 17 that accommodates both gears 15゜16, and a pump cover 18 that covers the front side of the pump body 17.
When the above-mentioned cylinder block 1 is formed, a regulator valve 21 for adjusting the discharge pressure is provided at the cylinder block 1, and a pump cover 18 is installed in front of the cylinder block 1. One end of the balancer shaft 3 is located inside the pump body 17 and a dry gear 15 is attached to it, and is further connected to the drive gear A715. A sprocket 9 is attached to a shaft 22 that protrudes outward from the pump cover 18.The sprocket 9 has a pin hinge on one end and a cylinder tab 1 on the other end. A chain guide 23 with a mounting number that can be adjusted in position is arranged, and this chain guide 23
In order to lay out the oil pump 14 compactly, the pump body 17 is located at the upper side of the oil pump 14.
A shaft portion 25 that pivotally supports a mounting piece 23a at one end of the chain guide 23 is integrally provided with a bolt 24 that fastens the bolt 24 and the pump cover 18 (see FIGS. 4 and 5). ).

1. In the 8VI slip system that lubricates the bearing parts of the above-mentioned balancer shuts 1 to 3 and 4, each bearing part 5a-5G, 5 for the balancer shut 3.4 is attached to the cylinder block 1.
) An oil supply passage 26 for supplying lubricating oil to each of 1 to 6C is provided. This oil supply passage 2
6 is connected to an oil passage 28 extending from the main oil gear gallery 27 toward the crankshaft supporting portion, and communicates with the main oil gear gallery 27 via this oil passage 28.

In particular, the bearing portion 5a on the front end side of the cylinder butt 1.

Oil supply passage 26 (first
As shown in the figure and FIG. 4, which is an enlarged view of the main part, there is a passage section 26a extending from a predetermined location of the cylinder block 1 to the bearing section E) of the balancer shaft 3 on one side and the other balancer shaft 4. A passage part 26b leading to the bearing part 6a is on the right, and both passage parts 26a.

26b are formed at positions perpendicular to the longitudinal direction of the engine and shifted in the longitudinal direction of the engine by the offset of both bearings 5a and 6a. In addition, the passage section 26
The diameter of a is set to be smaller than the diameter j of the passage portion 26b.

And both the bearing parts 5a.

6a is at a predetermined location of the cylinder block 1,
A cylinder button 1 is perpendicular to both bearing parts 5a and 6a.
The chain lubrication passages 29 are connected to each other by a chain lubrication passage 29 that extends toward the front end of the cylinder block 1, and an oil jet nozzle 30 that protrudes in the 111 direction of the cylinder block 1 is installed in the chain lubrication passage 29.

The tip of this oil jet nozzle 30 is directed toward the chain 13 of the drive mechanism. In this embodiment, since the diameter of the passage portion 26H is made smaller than the diameter of the passage portion 26b, the oil pressure to the oil jet nozzle 30 can be ensured. Further, an oil jet nozzle 30 is disposed near the bolt 24 which is commonly used for fastening the pump body 17 and pump cover 18 and for attaching the chain guide 23 as described in 077. Guide 23 mounting part and chain 1
The opening direction of the oil jet nozzle 30 is set so that oil is injected into a range extending over the range 3 (the range shown by the thin line A in FIG. 5). .

In addition, bearing part 5a on one balancer shaft 3 side in -1
For this purpose, an oil outlet is provided on the outer side of the cylinder block 1 on the opposite side from the L closed passage part 26a, through which the oil lubricating the C bearing part 5a flows out by using the perforated part when machining the passage part 26a. A passage 31 is formed, and from this oil outlet passage 31, the front end of the cylinder block 1, the pump body 17 of the oil pump 14, and the pump cover 18 are connected.
The thrust plate 32 inside the oil pump 14
An oil passage 33 is formed to send oil to sliding parts such as the gear shaft and the like.

According to the lubricating device having the above structure, the block I-13
At one end of the cylinder block 1 where the drive mechanism consisting of the drive mechanism and the oil pump 14 are disposed, the oil sent from the main oil gear 17 lary 27 to the oil supply passage 26 flows through the passage section of the oil supply passage 26. 26a,
26b, each bearing portion 5a bears against the balance shaft 3.4 on both sides.

6a. In this case, in order to reduce the protrusion of the oil pump 14 from the cylinder block 1 as described above, the bearing portion 5a for one balancer shaft 3 is offset inwardly than the bearing portion 6a for the other balancer shaft 4. However, such bearing parts 5a, 6
With respect to the arrangement in a, the oil supply passage 26 is shifted by the offset indicated by L i! [By forming both the passage portions 26a, 2
6b are communicated with each other by a chain lubrication passage 29, so that oil can be effectively supplied to each bearing portion 5a, 6ak. Furthermore, from the oil supply passage 26, f, r'
- Oil is also sent to the chain lubrication passage 29, and the chain 13
It is also used for lubrication. In this case, in this embodiment, oil is injected from the oil jet nozzle 30 over the chain 13 and the bin hinge part on the one end side of the chain guide 23, so that the lubricity of the bin hinge part is also increased, and the lubricity of this part is improved. Vibration is prevented.

Further, each of the passage portions 26a, 26b and the two chain lubrication passages are easily formed by the following curvature T. That is, the passage portions 26a and 25b are connected to the bearing portions 5a and 6a from both sides of the cylinder block 1, respectively.
A blind plug 34 is installed at the front end of the perforated portion on the side surface of the cylinder block 1. Furthermore, since the passage portions 26a and 26b are slightly offset, it is necessary to form a passage that communicates them, but in the present invention, this passage is used as the chain lubrication passage 29. When this passage is bored from the front side of the cylinder block 1, an oil jet nozzle 30 is attached to it. Therefore, compared to the case where the passage communicating with the passage portions 26a, 26b and the passage supplying oil to the chain 13 are formed separately, the structure is simplified and the processing becomes easier.

(Effects of the Invention) As described in 1 above, the present invention provides a bearing part for the balancer shaft of h, in which the actuating part of the auxiliary equipment is provided at the drive mechanism side end of the cylinder block.
Since it is offset inward in the longitudinal direction of the engine from the bearing portion relative to the foot, the amount of protrusion of the auxiliary equipment from the cylinder block can be reduced and the overall length of the engine can be shortened.

Then, in the passage for supplying oil to the two wheel receivers, two passages are provided that are shifted by the offset, and both passages are connected to the chain lubrication passage, making it relatively easy to use. Despite the passage structure, the overall length of the engine can be shortened as described in -1- without interfering with the lubrication of various parts.

[Brief explanation of drawings]

Fig. 1 is a horizontal sectional view showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, Fig. 3 is a side view without showing the balancer shaft drive mechanism, and Fig. 4 5 is an enlarged horizontal sectional view of the main part, FIG. 5 is an enlarged side view of the vicinity of the chain attachment point in the drive mechanism, and FIG. 6 is a schematic diagram of the oil pump. 1... Cylinder knob [1 tsuk, 3.4... Balancer shaft, 3a to 3c, 4a-4cm... Journal part, 5 a" Ri C, 6a to 6C... Bearing part, 14
... Oil pump (auxiliary 1), 15... Drive gear (auxiliary equipment operating part), 26... Oil supply passage, 26a
, 26b... passage section, 29... chain lubrication passage.

Claims (1)

[Claims] 1. A balancer shaft is provided on each side of the cylinder block, and one end of the cylinder block is provided outwardly.
In an engine with a balancer shaft, which is equipped with a drive mechanism using a chain that links each balancer shaft with the crankshaft, and in which an auxiliary operating part is provided at the end of one balancer shaft on the drive mechanism side, the cylinder block The bearing portion for one of the balancer shafts at the drive mechanism side end is offset inward in the longitudinal direction of the engine from the bearing portion for the other balancer shaft, and one side is provided in the passage for supplying oil to each of the bearing portions. A passage leading to one bearing part and a passage part leading to the other bearing part are formed perpendicular to the longitudinal direction of the engine and shifted in the longitudinal direction of the engine by the above-mentioned offset, and a passage part leading to the other bearing part is formed so as to be perpendicular to the longitudinal direction of the engine. A lubricating device for an engine with a balancer shaft, characterized in that a chain lubrication passage whose tip end opens toward the chain is provided.