KR0128261B1 - Chain driving system - Google Patents

Abstract

A first shoe 24 of a first chain tensioner device 21 in a chain drive device of an internal engine having a first chain 11 and a body 2 chain 12 to transmit the rotational force of the crankshaft to the camshaft. The sliding surface 25 is formed into a curved surface where the tangential velocity of the first chain 11 faces the lubricating oil supply portion 12a of the second chain 12.

Description

Chain drive

1 is an overall front view of a chain drive showing an embodiment of the present invention.

2 is an overall front view of the chain drive showing another embodiment.

3 is an enlarged front view of a part of the chain drive.

4 is a side view of the chain drive viewed from the direction of arrow A in FIG.

5 is a sectional view of the chain tensioner device.

6 is a rear view of the body of the chain tensioner device.

7 is a front elevational view of a chain lighting device showing another embodiment.

* Explanation of symbols for main parts of the drawings

1: crank sprocket, 2: 1st intake cam sprocket,

3: second intake cam sprocket, 4: exhaust cam sprocket,

11,12: chain, 1la, 12a: lubricant supply,

21,22: chain tensioner device, 23,24: shoe

Industrial use

The present invention relates to a lubrication structure of a chain drive installed in an internal combustion engine. '

Conventional technology

Chain lubricant, which transmits the rotational force of the crankshaft of the internal combustion engine to the camshaft on the cylinder head, is supplied with sufficient lubricating oil, such as a shoe of the chain tensioner device or an engagement portion with a sprocket, thereby reducing the wear of each part and simultaneously Can reduce the noise generated in the air (see Japanese Patent Application Laid-Open No. Hei 2-57750).

As a conventional chain drive of an internal combustion engine, there are some shown in FIG. 8, for example.

This will be described. In the front part of the internal combustion engine, a crank sprocket 1 connected to the crankshaft, a first intake cam sprocket 2 and a second intake cam sprocket 3 connected to the intake cam shaft, And an exhaust cam sprocket 4 connected to the exhaust cam shaft, the first chain 11 being rotated by the crank sprocket 1 and the first intake cam sprocket 2, and the second intake cam sprocket. (3) and a second chain 12 which is caught and rotated by the exhaust cam sprocket, the rotational force of the crankshaft is transmitted to each camshaft.

Each sprocket 1, 2, 3, 4 is rotated in the direction indicated by the arrow in the drawing, and the tension of each chain 11, 12 is hydraulically applied to the relaxed side of the first chain 11 and the second chain 12. The tensioner apparatuses 21 and 22 which are the 1st and 2nd chains to adjust to each other are provided, respectively.

As the lubricating oil supply part requiring the supply of lubricating oil in the first and second chains 11 and 12, the first and second shoes 24 and 23 of the first and second chain tensioner devices 21 and 22 enter. There are lubricating oil supply parts 1la and 12a on the side, and as shown by arrows in the figure, two oil jets 33 and 32 are respectively provided for injecting lubricating oil toward the respective lubricating oil supply parts 1la and 12a.

Problems to be Solved by the Invention

However, in the conventional chain drive device of an internal combustion engine, since two cucumber jets 33 and 32 are provided for the first and second shoes 24 and 23, respectively, the components provided in the engine chain chamber. In addition to increasing the number of pumps, there is a problem that the flow path structure for guiding the lubricating oil from the engine oil pump to each of the oil sets 33 and 32 is complicated, and at the same time, the capacity of the oil pump needs to be increased. .

It is an object of the present invention to simplify the lubrication structure provided in the chain drive of an internal combustion engine in view of the above problems.

Means to solve the problem

The invention according to claim 1 comprises a crank sprocket connected to a crankshaft, a first chain rotated by a crank sprocket, a cam sprocket connected to a cam shaft, and a second chain rotated by a cam sprocket. In a chain drive of an internal combustion engine that transmits the rotational force of the crankshaft to the camshaft, a chain tensioner device for suppressing the shoe is provided in one chain, and the sliding surface of the shoe is supplied with lubricating oil of the chain on the other side of the chain. It is formed into a curved surface facing the wealth.

The invention according to claim 2 is provided with a first chain tensioner device for suppressing the first shoe in the first chain, and at the same time a second chain tensioner device for suppressing the second shoe in the second chain. The sliding surface of the first shoe is circulated to face the crank sprocket, and the first chain is circulated against the sliding surface of the second shoe, and the tangential velocity of the first chain is the second shoe of the second chain. It is formed into a curved surface facing the lubricating oil supply portion on the entry side with respect to the.

According to claim 3, the invention comprises a crank sprocket connected to a crankshaft, a first chain rotated by a crank sprocket, a cam sprocket connected to a cam shaft, and a second chain rotated by a cam sprocket. In the chain drive mechanism of an internal combustion engine that transmits the rotational force of the crankshaft to the camshaft, a chain valve device for hydraulically adjusting the tension of the chain is provided, and a hydraulic supply system for supplying hydraulic pressure to the chain valve device and the chain are provided. An air exhaust port interlocking with the chain chamber to be accommodated is provided, and the air exhaust port is formed to face the lubricating oil supply portion of the chain.

Action

In the invention according to claim 1, the chain slides on the sliding surface of the curved shoe, and lubricating oil splashing out of the chain scatters in the tangential velocity direction of the chain by its inertia force. The sliding surface of the shoe is formed in a curved function in which the tangential speed of the chain is directed to the lubricating oil supply part of the other chain, so that a large amount of lubricating oil that is lifted off the chain sliding the shoe is supplied to the lubricating oil supply part of the other chain. This reduces the wear on the chain and reduces the noise generated by the chain.

In the invention as set forth in claim 2, the lubricating oil splashing in the first chain that slides the sliding surface of the first shoe is transferred to the second shoe of the second chain located in the tangential velocity direction of the first chain by its inertia force. To the lubricating oil supply portion on the entry side. Accordingly, the sliding parts of the second chain and the second shoe are lubricated by the lubricating oil that rises away from the first chain that slides the first shoe.

In the invention according to claim 3, the air supply port communicating with the hydraulic supply system for supplying hydraulic pressure to the chain tensioner device and the chain chamber accommodating the chain is open at the ceiling wall of the distribution passage or the oil storage chamber, and is contained in the lubricating oil. When the air is sent to the chain chamber, a part of the lubricating oil which is sent to the chain tensioner unit together with the air is ejected to the chain chamber.

By forming the air exhaust port toward the lubricating oil supply part on the suppression side with respect to the chain sprocket or shoe, the lubricating oil ejected from the air exhaust port is supplied to the lubricating oil supply part of the chain, reducing the wear of each part and at the same time reducing the noise generated in the chain.

Example

Best Mode for Carrying Out the Invention Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, in the front part of the internal engine, the crank sprocket 1 connected to the crank shaft 9, for example, the first intake cam sprocket 2 and the second intake connected to the intake cam shaft. A first chain 11 having a cam sprocket 3, an exhaust cam sprocket 4 connected to the exhaust cam shaft, and rotating over the crank sprocket 1 and the sieve 1 intake cam sprocket 2; The second intake cam sprocket 3 and the second chain 12 which are caught and rotated by the exhaust cam sprocket 4 are provided to transmit the rotational force of the crankshaft to each cam shaft.

Each sprocket 1, 2, 3, 4 is rotated in the direction indicated by the arrow in the figure, and the tension of each chain 11, 12 is adjusted on the relaxed side of the first chain 11 and the second chain 12. The first chain tensioner device 21 and the second chain tensioner device 22 are respectively provided.

The first chain tensioner device 21 includes a first shoe 24 having a sliding surface 25 in sliding contact with the first chain 11, a cylindrical sleeve 17 to which the first shoe 24 is connected, The body 16 which accommodates the sleeve 17, the hydraulic chamber comprised between both, and the spring fitted in both are provided. The sleeve 17 is pushed out of the body 16 by the hydraulic force guided by the hydraulic chamber and the pressing force of the spring, presses the first shoe 24 into the first chain 11, and is prescribed by the first chain 11. It is intended to give a tension of.

The second chain tensioner device 22 has the same structure, presses the second shoe 23 with the second chain 12, and imparts a predetermined tension to the second chain 12.

The second engagement tensioner device 22 is disposed between the second intake cam sprocket 3 and the exhaust cam sprocket 4, and a sliding surface for sliding contact of the second chain 12 of the second shoe 23 ( A sliding surface 26 for sliding contact of the crank second chain 12 to the crank sprocket 1 is arranged so that the sliding surface 26 is positioned on each cam sprocket 3,4 of the second chain 12. Press this side down on the bottom side.

The second tensioner device 21 is arranged such that the first shoe 24 is positioned below the second shoe 23. The first chain 11 which slides the first shoe 24 rises from the crank sprocket 1 to the first intake cam sprocket 2 and faces the sliding surface 26 of the second shoe 23. Circulate

As a lubricating oil supply part which requires supply of lubricating oil to the 1st chain 11, there is the lubricating oil supply part 11a of the entry side with respect to the 1st shoe 24, and each lubricating oil supply part as shown by the arrow in the figure is shown. The oil jet 33 which sprays toward 11a is provided.

As a lubricating oil supply part which requires supply of lubricating oil to the 2nd chain 12, there is the lubricating oil supply part 12a of the entry side with respect to the 2nd shoe 23. As shown in FIG.

The surface 25 is formed as a curved surface where the tangential velocity of the first chain 11 is directed toward the lubricating oil supply portion 12a of the second chain 12. Where the tangential velocity is the instantaneous linear velocity of the object traveling in a nonlinear trajectory.

In the front view of FIG. 1, the sliding surface 25 of the first shoe 24 is formed into a solid surface that curves symmetrically with respect to the centerline 0 of the sleeve 7. As a result, since there is a vector of the tangential velocity of the first chain 11 that slides the sliding surface 25 on the line segment C that intersects the center line 0 and the first chain 11 orthogonal to the center line 0, the line segment C is the second. It is set as the positional relationship which intersects with the lubricating oil supply part 12a of the chain 12. As shown in FIG. That is, the shape of the sliding surface 25 of the first shoe 24 serving as the trajectory of the first chain 11 has its tangent (a line segment extending in a direction perpendicular to the radius of the curvature circle) of the second chain 12. It is formed to pass through the vicinity of the lubricating oil supply part 12a.

The following will be described.

The first chain 11 slides on the sliding surface 25 of the first shoe 24 on the curved surface, and the lubricating oil scattered in the first chain 11 scatters in the tangential velocity direction of the first chain by its inertia force. do. The sliding surface 25 is formed by forming the sliding surface 25 of the first shoe 24 into a curved surface in which the tangential velocity of the first chain 11 is directed toward the lubricating oil supply part 12a of the second chain 12. The lubricating oil scattered by the moving first chain 11 is directed to the lubricating oil supply part 12a of the second chain 12.

The first chain 11 and the second chain 12 are offset from each other in the front-rear direction of the engine, and lubricating oil splashed from the first chain 12 is discharged from the chain chamber according to the circulation of the first chain 12. It diffuses by the generated air flow and reaches the second chain 11 located behind the engine than the first chain 11.

As a result, a large amount of lubricating oil that is separated from the first chain 11 that slides the sliding surface 25 is supplied to the lubricating oil supply part 12a of the second chain 12, and the second chain 12 or the second chain While reducing the wear of the second shoe 23 of the tensioner device 22, the noise generated in the second chain 12 is reduced.

As a result, it becomes possible to close the oil jet which injects the lubricating oil toward the lubricating oil supply part 12a of the entry side with respect to the 2nd shoe 23 of the 2nd chain 12, and removes the parts set provided in a chain chamber. It becomes possible to abolish, not only reduce the number of parts provided in the chain chamber, but also simplify the structure of the flow path for supplying lubricant to each of the chains 11 and 12, and at the same time, reduce the capacity of the oil pump.

Next, another embodiment shown in FIG. 2 will be described.

In front of the V-shaped engine, a crank sprocket 1 connected to the crank shaft 9 and a first intake cam sprocket 2 and a second intake cam sprocket connected to each intake cam shaft of the right bank. (2) having a first chain (11) to rotate and a second intake cam sprocket (3) in the left and right banks and a second chain (12) to be rotated by the exhaust cam sprocket and the crankshaft (9) It is adapted to transmit rotational force to each camshaft.

Each sprocket 1, 2 is rotated in the direction indicated by the arrow in the drawing, the first chain tensioner device for adjusting the tension of the first chain 11 on the relaxed side of the first human body 11 located in the right bank 21 is provided. In the first chain tensioner device 21, a first shoe 24 having a sliding surface 25 in sliding contact with the first chain 11 is rotatably supported with respect to the engine block via an axis 18. In the figure, reference numeral l4 denotes an idler sprocket, and reference numerals 15, 19, and 20 respectively denote chain guides.

Each sprocket 3, 4 of the left and right banks rotates in the direction indicated by the arrow in the figure, and the second chain tensioner device 22 adjusts the tension of the second chain 12 on the relaxed side of the second chain 12. Is installed.

As the lubricating oil supply part that requires supply of lubricating oil to the first chain 11, there is a lubricating oil supply part 11a on the entry side with respect to the first shoe 24 of the first chain tensioner device 21, and the lubricating oil is shown in the drawings. As shown by the arrow in FIG. 3, oil jets 33 are provided to inject toward the respective lubricant supply parts 1la.

As the lubricating oil supply part of the 2nd chain 12, the lubricating oil supply part 12a of the entry side with respect to the 2nd shoe 23 of the 2nd chain tensioner apparatus 22 is shown in FIG. The first chain circulating the first shoe 24 is formed by forming the sliding surface 25 of the circumferential surface 25 of the circumferential surface of the first chain 11 toward the lubricating oil supply portion 12a of the second chain 12. The lubricating oil which rises away from (11) is configured to reach the lubricating oil supply part 12a as shown by arrow B in the figure.

The lubricating oil ejected from the air exhaust port 45 of the first chain tensioner device 21 is configured to reach the lubricating oil supply part 12a as shown by arrow D in the figure.

As shown in FIG. 5, the sleeve 17 is rotatably fitted in the cylinder portion 28 of the body 16, and a spring 46 is mounted between the sleeve 17 and the body 16 and both A hydraulic chamber 47 is defined therebetween, and the sleeve 17 is pushed out of the cylinder portion 28 by the hydraulic force guided by the hydraulic chamber 47 and the pressing force of the spring 46, and the shoe 24 is removed. The first chain 11 is pressed down to impart a predetermined tension to the first chain 11.

As shown in FIG. 4, the oil storage chamber 29 which stores lubricating oil is defined between the attachment sheet 27 and the body 16 of the tensor apparatus 21 which is the 1st body joined to an engine block. The lubricating oil discharged from the engine oil pump is sent to the oil storage chamber 29 through an unshown flow path formed in the engine block.

As shown in FIG. 6, an air exhaust port 45 communicating with the chain chamber 8 of the engine is formed in the ceiling wall portion of the oil storage chamber 29. As shown in FIG. The air exhaust port 45 is formed to a diameter of about 0.5mm. Air contained in the lubricating oil stored in the oil sump 47 exits the chain chamber 8 through the air exhaust port 45, and the air-removed lubricating oil passes through the through hole 35 and the check valve 34 to the hydraulic chamber. Flowing to 47, the amount of lubricant leaked from the gap around the sleeve 17 is to be replenished.

The air exhaust port 45 is not limited to the oil storage chamber 29 but may be formed in another hydraulic supply system such as a flow path communicating with the discharge side of the oil pump and the hydraulic chamber 47.

The air exhaust port 45 is formed toward the lubricating oil supply part 12a on the entry side with respect to the second shoe 23 of the second chain 12. That is, the center line of the air exhaust port 45 is set in the positional relationship which intersects the lubricating oil supply part 12a of the entry side with respect to the 2nd shoe 23 of the 2nd chain 12, and blows off from the air exhaust port 45 Lubricating oil is supplied to the lubricating oil supply part 12a on the entry side.

It is comprised as mentioned above, and action | movement to a dium is demonstrated.

A large amount of lubricating oil that rises away from the first chain 11 that slides the sliding surface 25 is supplied to the lubricating oil supply part 12a of the second chain 12 and at the same time, the lubricating oil that is ejected from the air exhaust port 45 enters the second chain. Noise supplied to the lubricating oil supply part 12a of (12), reducing wear of the second shoe 23 of the second chain 12 or the second chain tensioner device 22, and at the same time, the noise generated in the second chain 12. Reduce

As a result, it becomes possible to close the oil jet which injects the lubricating oil toward the lubricating oil supply part 12a of the entry side with respect to the 2nd shoe 23 of the 2nd chain 12, and is provided in the chain chamber B In addition to reducing the number of parts, it is possible to simplify the structure of the flow path for supplying lubricant to each of the chains 11 and 12, and at the same time, to reduce the capacity of the oil pump.

Next, another embodiment shown in FIG. 7 will be described.

The air exhaust port 45 of the first chain tensioner device 21 is formed toward the lubricating oil supply portion 12a on the entry side with respect to the second shoe 23 of the second chain 12, and at the same time, the second chain tensioner device ( The air exhaust port 36 of 22 is formed to face the lubricating oil supply part 12 on the entry side with respect to the second intake cam sprocket 3 of the second chain 12.

In this case, the oil jet which injects lubricating oil into the lubricating oil supply part 12a of the entry side with respect to the 2nd hop cam sprocket 3 of the 2nd chain 12 to the air exhaust port 36 of the 2nd chain tensioner apparatus 22. In addition, the number of parts provided in the chain chamber 8 can be eliminated, and the structure of the flow path for supplying lubricating oil to each of the chains 11 and 12 can be simplified, and at the same time, the capacity of the oil pump can be increased. It can be made small.

As described above, the invention described in claim 1 includes a crank sprocket connected to a crankshaft, a first chain rotated by a crank sprocket, a cam sprocket connected to a camshaft, and a cam sprocket that rotates on a cam sprocket. In a chain drive of an internal combustion engine provided with two chains to transmit the rotational force of the crankshaft to the camshaft, a chain tensioner device for suppressing the shoe is provided on one chain, and the sliding surface of the shoe has a different tangential speed of the chain. Since it is formed as a curved surface facing the lubricating oil supply part of the convenience chain, a large amount of lubricating oil scattered from the chain is supplied to the lubricating oil supply part of the chain, thereby reducing the lubrication structure of the chain by cutting the oil jet and distribution to inject and supply the lubricating oil to the chain. At the same time, the capacity of the oil pump can be reduced.

The invention according to claim 2 is provided with a first chain tensioner device for suppressing a first shoe in a first chain, and a second tensioner device for suppressing a second shoe in a second chain. Of the first shoe is circulated to face the crank sprocket, and the first chain is circulated to face the sliding face of the second shoe, and the first chain is circulated to face the sliding surface of the second shoe. Since the sliding surface is formed into a curved surface in which the tangential velocity of the first chain is directed toward the lubricating oil supply part on the entry side with respect to the second shoe of the second chain, the second surface is lubricated by the lubricating oil that rises away from the sliding first chain. The sliding parts of the chain and the second shoe are lubricated.

According to claim 3, the invention comprises a crank sprocket connected to a crankshaft, a first chain rotated by a crank sprocket, a cam sprocket connected to a cam shaft, and a second chain rotated by a cam sprocket. In the chain drive device of an internal combustion engine which transmits the rotational force of a crankshaft to a camshaft, it installs the chain tensioner apparatus which hydraulically adjusts the chain tension, and accommodates the hydraulic supply system and chain which supply hydraulic pressure to a chain tensioner apparatus. Since an air exhaust port communicating with the chain chamber is provided, and the air exhaust port is formed toward the lubricating oil supply part of the chain, the lubricating oil ejected from the air exhaust port is supplied to the lubricating oil supply part of the chain, and thus, an oil jet and a distribution path for spraying and supplying lubricating oil to the chain Reduction, simplifying the lubrication structure of the chain and at the same time It can gehal.

Claims (3)

The crank sprocket connected to the crank shaft, the first chain rotated by the crank sprocket, the cam sprocket connected to the cam shaft, and the second chain rotated by the cam sprocket transmit the rotational force of the crank shaft to the cam shaft. In a chain drive device of an internal combustion engine, a chain tensioner device for suppressing a shoe is provided in one chain, and the sliding surface of the shoe is formed in a curved surface in which the tangential velocity of the chain is directed to the lubricating oil supply part of the other chain. Chain drive device. 2. The sliding surface of the second shoe according to claim 1, wherein the first chain tensioner device for suppressing the first shoe is installed in the first chain, and the second tensioner device for suppressing the second shoe is installed in the second chain. Is placed so as to face the crank sprocket, and the first chain is circulated against the sliding surface of the second shoe, and the sliding surface of the first shoe is tangential to the second shoe of the second chain. A chain drive device, characterized by being formed into a curved surface that faces the lubricating oil supply part on the entry side. The crank sprocket connected to the crank shaft, the first chain rotated by the crank sprocket, the cam sprocket connected to the cam shaft, and the second chain rotated by the cam sprocket transmit the rotational force of the crank shaft to the cam shaft. In the chain drive device of an internal combustion engine, a chain tensioner device for hydraulically adjusting the tension of the chain is installed, a hydraulic supply system for supplying hydraulic pressure to the chain tensioner device, and an air exhaust port communicating with a chain chamber accommodating the chain. And the air exhaust port is formed so as to face the lubricating oil supply part of the chain.