WO2012096508A2 - Oil supply structure of a multi-cylinder engine - Google Patents

Abstract

The present invention relates to an oil supply structure of a multi-cylinder engine. In the oil supply structure of the multi-cylinder engine including a balance shaft and a cam shaft, each of the balance shafts and the cam shafts having an oil passage extending lengthwise along an axial direction in the center of each of the shafts. Also, a plurality of journals connected to a cylinder block are disposed on an outer circumference part of each of the balance shaft and the cam shaft. An intake passage connected to the oil passage is formed in the outer circumference part of the journal, which is disposed on the foremost end of each of the shafts, from among the plurality of journals. Also, discharge passages connected from the oil passage to outer circumference parts of the corresponding journals are formed in the journals except for the foremost end journal, respectively. A supply passage extending from a lower portion of the cylinder block to an upper portion via a periphery of the foremost end journal of the balance shaft and the foremost end of the cam shaft is formed in a front surface of the cylinder block. Thus, lubricating oil may be continuously supplied into the cam shaft and the balance shaft using one supply passage.

Description

 【Specification】

 [Name of invention]

 Oil supply structure of multi-cylinder engine

Technical Field

 The present invention relates to an oil supply structure of a multi-cylinder engine, and more particularly, to an oil supply structure of a multi-cylinder engine having a pair of balance shafts for implementing a vibration canceling function of the engine.

 <2>

 Background Art

 <3> The structure of the engine, which is the core of the vehicle driving force generation, is roughly described. The cylinder block, the cylinder head mounted on the cylinder block and installed with a hop, an exhaust valve and an opening / closing mechanism, is mounted on the lower part of the cylinder block. It comprises an oil pan in which engine oil is stored.

 <4> The cylinder block has several cylinders, for example four cylinders for four-cylinder engines and six cylinders for six-cylinder engines, each of which compresses and explodes a mixture of mixed air mixed with fuel. The piston is equipped to reciprocate.

 Each piston is connected to a connecting rod, and a lower end of the connecting rod is connected to a crank shaft for converting a linear movement of the piston into a rotational movement. And the rotational force of the tank tank shaft can be transmitted to the transmission to change the rotational speed through the clutch.

 The crankshaft is rotated by the movement of the lowering piston when the mixed air explodes in the cylinder, that is, by the force transmitted to the lowering of the piston in the explosion stroke, rather than during the other strokes of suction, compression and exhaust stroke. The force that tries to stop is working.

<7> Therefore, one end of the crankshaft is equipped with a flywheel to induce rotational inertia and restrain the force to stop the crankshaft as much as possible. It will be able to rotate.

 However, in the case of the general engine of the above-described configuration, since the piston moves up and down while the engine is driven, the crank shaft rotates up and down, so that the vertical upward force and the horizontal movement of the piston are moved upward. Due to power

The moment of inequality occurs in the two-dimensional direction, which causes the engine to tremble violently. There was a problem.

 <9> Balance shafts to counteract the above-mentioned engine vibrations due to inequality moment

Techniques for adopting a balance shaft are known. The balance shaft is an idle gear, which is electrically connected to the tank shaft, and is integrally equipped with a biased weight called 'weight'.

When the balance shaft is rotated by crank shaft rotation when the balance shaft is provided with a weight, a vibration force is generated by the rotation of the deflected weight, and the vibration force acts as a vibration to offset the aforementioned inequality moment. Vibrations are reduced. Korean Unexamined Utility Model Publication No. 1998-043076 discloses the balance axis configuration described above.

 <ιι> The balance shaft rotates at high speed in the cylinder block while generating the driving force necessary to offset the vibration caused by the rotation of the engine, specifically the crankshaft rotation, and smooth high-speed rotation to cancel the vibration. For this purpose, oil introduced into the cylinder block from the oil pan is used as a lubricant.

 In order to lubricate the balance shaft, an oil path, that is, a flow path, is formed in the cylinder block so that the oil stored in the oil pan can be provided toward the balance shaft side, so that the oil provided in the flow path of the cylinder block can flow. An oil path, that is, a flow path, is formed therein.

 In addition, the camshaft related to intermittent opening and closing of the hop and exhaust valves is also used as a lubricant by receiving oil from the cylinder block for smooth rotation in the cylinder block, and the cylinder block is provided so that oil can be supplied to the camshaft. The flow path is formed in a path different from the path through which the balance shaft oil is provided.

In the multi-cylinder engine known as described above, the oil path provided to the cam shaft and the path provided to the balance shaft are provided on the layout due to the arrangement of the cam shaft and the balance shaft installed in the cylinder block. As it is formed independently, there is a difficulty in designing a flow path for supplying oil independently to each other, and the designed flow path is also very complicated.

 <15> As the flow path becomes more complicated, a higher level of processing precision is required in the manufacture of the cylinder block, which leads to a problem in that the mass production of the product is inferior. In addition, the manufacturing cost of the product is also inevitably increased. It is disadvantageous in terms of competition.

<16> [Detailed Description of the Invention]

 [Technical problem]

 The technical problem to be solved by the present invention is a simple structure, multi-cylinder engine that can implement the lubrication for the cam shaft and the balance shaft at the same time effectively, and can simplify the processing of the cylinder block in forming the oil supply flow path It is to provide an oil supply structure.

 <18>

 Technical Solution

 As a means for solving the above-mentioned problems, the present invention provides a pair of balance shafts arranged transversely to cylinder blocks on both sides of a cylinder bore, and a cam shaft on a cylinder block immediately above the right balance shaft among the pair of balance shafts. In the multi-cylinder engine configured to be parallel to the right balance shaft, the balance shaft and the cam shaft have an oil passage formed along the axial direction at the center of the shaft while the outer diameter portion is connected to the cylinder block. A journal having a plurality of journals, the journal located at the top of each axis of the plurality of journals is formed with an inlet passage leading from the outer diameter portion of the journal to the oil passage, and the journal except for the top journal has a corresponding journal in the oil passage A back flow path is formed leading to the outer diameter portion of the journal, and the front end of the cylinder block has a front end of the balance shaft and the best of the cam shaft. However, the oil supply structure of the multi-cylinder engine is provided, wherein an oil supply passage extending from the lower portion of the cylinder block to the upper portion is formed around the journal.

In this embodiment, a bush that is connected to the journal and rotatably supports the balance shaft may be press-fitted to the cylinder block at the position facing the respective journals formed on the balance shaft.

 In addition, a hole is formed in the bush which is connected to the journal on the side of the balance shaft among the bushes so that the oil provided through the oil supply passage is introduced into the oil passage at the center of the shaft through the bush and the inlet passage. In the outermost portion of the journal on the outermost side of the balance shaft, the recess including the path via the inlet passage may be recessed.

In the present embodiment, the oil passage includes a straight flow path divided into three sections, and two curved grooves passing around the outer diameters of the front end journal of the balance axis and the front end journal of the cam shaft, respectively. groove), and the three linear flow paths and the two curved grooves preferably form one continuous flow path extending from the lower portion of the cylinder block to the upper portion thereof. <23>

 Advantageous Effects

 According to the oil supply structure of the multi-cylinder engine according to the embodiment of the present invention, the oil provided in the cylinder block can be smoothly provided to the cam shaft and the balance shaft with only one oil supply passage formed in the cylinder block. Can be implemented. That is, lubrication for the camshaft and the balance shaft can be implemented effectively at the same time as a simple flow path.

In addition, since a single oil supply passage for providing oil to each axis is unified, it is possible to simplify processing in forming an oil passage in a cylinder block, thus improving production yield of a product. In addition, the production cost can be lowered in proportion to the structure simplification, which is advantageous in terms of price competition.

 <26>

 [Brief Description of Drawings]

 1 is a perspective view schematically showing a cylinder block of a multi-cylinder engine employing an oil supply structure according to an embodiment of the present invention.

2 is a lateral cross-sectional view of a multi-cylinder engine cylinder block employing an oil supply structure according to an embodiment of the present invention.

 3 is an enlarged cross-sectional view showing main parts of the main part of the present invention shown in FIG. 2.

<30>

 [Best form for implementation of the invention]

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

 1 is a perspective view schematically showing a cylinder block of a multi-cylinder engine employing an oil supply structure according to an embodiment of the present invention. With reference to this, the overall configuration of the multi-cylinder engine to which the oil supply structure according to the present invention is applied will be described first.

 As shown in Fig. 1, a pair of balance shafts 3 for generating a vibration force are provided in the transverse direction in the cylinder block 1 on both sides of the cylinder bore 2 in which the piston is installed. Among the pair of balance shafts 3, a cam shaft 4 involved in hop-exhaust control is provided in the cylinder block 1 directly above the right balance shaft 3b in parallel with the right balance shaft 3b. .

The rotational force for driving the balance shaft 3 and the camshaft 4 is transmitted from a crank shaft (not shown) which converts the linear movement of the piston into rotational movement. On the front of the tank shaft, the balance shaft 3, the cam shaft 4, and the cylinder block 1, the drive gear 6 and the driven gear 9K10 and a plurality of first and second idle gears as shown in FIG. (7) (8) are installed.

 Therefore, when the first idle gear 7 in the center rotates due to the rotation of the drive gear 6 according to the rotation of the crankshaft shaft, the left balance shaft 3a and the second children engaged with the first idle gear 7 are rotated. The gear 8 and the camshaft 4 are rotated in the same direction, and the right balance shaft 3b is rotated by the second idle gear 8 so as to be opposite to the rotation direction of the left balance shaft 3 described above. Rotates in the direction to generate an oscillating force against the inequality moment.

In the cylinder block 1 for lubrication of the balance shaft 3 and the cam shaft 4 which rotate at high speed, oil stored in an oil pan (not shown) may be provided to the balance shaft 3. An oil path, that is, a flow path is formed, and the balance shaft 3 and the cam shaft 4 are supplied with the oil provided in the flow path of the cylinder block 1 to the specific position to be connected and supported by the cylinder block 1. An oil path, that is, a flow path, is formed so that it can be supplied.

 The oil supply structure according to the present embodiment will be described in more detail with reference to FIG. 2.

FIG. 2 is a lateral cross-sectional view of a multi-cylinder engine cylinder block adopting an oil supply structure according to an exemplary embodiment of the present invention, and an oil passage 30X40 corresponds to a center of an axis of the balance shaft 3 and the cam shaft 4. It is formed long along the longitudinal direction of the shaft. Each shaft outer diameter portion has a plurality of journals (32 ₃ , 321), 32 (:) (423, 421), 42 (:) for projecting at equal intervals or unequal intervals for connection with the cylinder block (1). do.

 Among the many journals, the journals 32a and 42a located at the top of the balance shaft 3 and the cam shaft 4 have an oil passage in the center of the shaft at the outer diameter of the journal 32a and 42a. An inflow passage 34K44 is formed leading to 30) and 40, and the journals 32b and 32c and 42a and 42c except for the front end journals 32a and 42a correspond to the oil passages 30 and 40c. A drainage passage (36X46) is formed that leads to the outer diameter of the journal.

 In addition, an oil supply passage 5 extends from the lower portion of the cylinder block 1 to the upper portion of the cylinder block 1 in the form passing through the periphery of the uppermost journals 32a and 42a.

Accordingly, the oil provided to each of the shafts 3 and 4 through the oil supply passage 5 passes through the inlet passages 34 and 44 passing through the uppermost journals 32a and 42a of the respective shafts. The oil flowing into the oil passage 30X40 formed at the center of each axis, and the oil flowing through the oil passage 30X40, passes through the drain passage 36K46 formed in the other journals, and the journals 323, 32, 3, 32 (:) ( 423,421) and 42 (:) are provided between the cylinder block and the rotatable connection so that the journal does not squeeze during rotation. It is.

 FIG. 3 is an enlarged cross-sectional view showing main parts of the main part of the present invention shown in FIG. 2.

 Referring to Figure 3 in detail, the journal formed on the balance axis (3) of the journal

 Bushes 12a, 12b, 12c connected to the journals 32a, 32b, 32c to rotatably support the balance shaft 3 to the cylinder block 1 at the point where the 32a, 32b, 32c are connected. Is press-fitted.

 The front end journal 32a of the balance shaft 3 of the bush 12 so that oil can flow from the outside of the shaft to the oil passage 30 at the center of the shaft through the bush and the inlet passage 34. ), A through hole (see FIG. 1) is formed in the bush 12a for connection.

 A groove having an outer diameter portion of the journal 32a at the extreme end side of the balance shaft 3 at the position where the through hole 120 is formed, includes a path passing through the inlet passage 34 in the circumferential direction of the journal. 33 is formed recessed.

 Accordingly, the oil flowing through the oil supply passage 5 flows into the recess 33 through the through hole 120 of the bush 12a, and passes through the journal 32a. It may be provided to the above-described oil passage 30 formed in the center of the balance shaft (3) through).

 Meanwhile, as shown in FIG. 3, the oil supply passage 5 includes straight flow passages 50a, 50b, and 50c divided into three sections, the front end journal 32a of the balance shaft 3 and the cam shaft ( It consists of two curved grooves (52a, 52b) passing through the periphery of the outermost portion of the frontmost journal (42a) of 4), and the three straight flow paths (50a, 50b, 50c) and two curved The grooves 52a and 52b form one continuous flow path extending from the bottom of the cylinder block 1 to the top.

 Accordingly, when oil is supplied from the oil pan located under the cylinder block 1, the supplied oil is curved groove at the point where the linear flow path 50a on the lower side of the cylinder meets the balance shaft 3 ( 52a), the linear flow path 50b between the balance shaft 3 and the camshaft 4, the curved groove 52b at the point of contact with the camshaft 4, and the other straight flow path 52c extending above the camshaft 4; Through it, it enters into another space in the cylinder block (1).

 In the above process, some oils are curved grooves where they meet the balance axis (3).

It passes through the through hole 120 formed in the bush 12a, the groove 33, and the inlet passage 34 while passing through the 52a, and flows into the balance balance shaft 3, and as a lubricant for lubrication of the balance shaft 3. Some other oil is passed through the curved groove 52b at the point of contact with the camshaft 4. In addition, it enters the camshaft 4 through the inflow path 44 in front of the camshaft 4, and functions as a lubricant for smooth rotation of the camshaft 4. As shown in FIG.

In the detailed description of the present invention, only specific embodiments thereof are described. It is to be understood, however, that the present invention is not limited to the specific forms referred to in the description, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. Should be.

 <51>

 <52> [Description of the Sign]

 1 ： Cylinder Block 2 ： Cylinder Bore

 3: Balance Shaft 4: Cam Shaft

 5 ： filial piety 12a, 12b, 12c ： bush

 30, 40 ： Oil passage 32a, 32b, 32c ： Journal (balance shaft)

 34 ： Inlet flow path (balance shaft) 36 ： Inlet flow path (balance shaft)

 <58> 42a, 42b, 42c ： Journal (camshaft) 44 ： Entrance channel (camshaft)

 46: drainage path (camshaft) 52a, 52b groove

 <60> 50a, 50b, 50c ： Straight flow path

Claims

[Range of request]  [Claim 11  In a multi-cylinder engine in which a pair of balance shafts are provided in the cylinder blocks on both sides of the cylinder bore, and a cam shaft is installed parallel to the right balance shaft in a cylinder block directly above the right balance shaft among the pair of balance shafts. ,  The balance shaft and the cam shaft has an oil passage formed along the axial direction at the center of the shaft, the outer diameter portion is provided with a plurality of journals for connection with the cylinder block,  The journal located at the top of each axis of the plurality of journals is formed with an inlet passage leading to the oil passage in the outer diameter of the journal,  Journals other than the foremost journal are formed in the oil passage from the oil passage to the outer diameter of the journal,  The oil supply structure of the multi-cylinder engine, characterized in that the front of the cylinder block is formed with an oil passage extending from the lower portion of the cylinder block to the upper portion via the uppermost journal of the balance shaft and the uppermost journal of the cam shaft. [Claim 2]  The method of claim 1,  And a bush which is connected to the journal and rotatably supports the balance shaft in a cylinder block at a position facing the respective journals formed on the balance shaft. [Claim 3]  The method of claim 2,  A through hole is formed in the bush which is connected to the journal on the side of the balance shaft of the bush so that the oil provided through the oil supply passage is introduced into the oil passage through the bush and the inlet passage.  An oil supply structure for a multi-cylinder engine, characterized in that a recess is formed in the outer diameter portion of the journal at the outermost side of the balance shaft corresponding to the hole formation position, the recess including a path passing through the inlet passage. [Claim 4] The method of claim 1,  The oil supply passage,  A straight flow path divided into three sections; And  And two curved grooves passing around the outer diameter portion of the front end journal of the balance shaft and the front end journal of the cam shaft, respectively.  The three straight flow passages and the two curved grooves form an oil supply structure of a multi-cylinder engine, characterized in that it forms one continuous flow passage extending from the lower portion of the cylinder block to the upper portion.