Chain guide mechanism frame

Abstract

To provide a frame of a chain guide mechanism which can efficiently collect oil adhering to each constitution of the chain guide mechanism with a simple constitution, can guide the collected oil to a prescribed position, and can efficiently reuse the oil.SOLUTION: In a frame 100 of a chain guide mechanism, a main body part 110 has driven sprocket holding parts 120, 121, a fixed chain guide 111, and an oscillation chain guide holding part 114. A drive sprocket holding part 122 is arranged below the driven sprocket holding parts 120, 121. At the main body part 110, a recessed and / or protruded oil path extending from the upper side to the lower side and guiding oil EL to above the drive sprocket holding part 122 is arranged.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a frame for a chain guide mechanism used in an engine timing system or the like. [Background technology]

[0002] BACKGROUND ART Conventionally, a tensioner lever such as that disclosed in Patent Document 1 is known as a configuration for effectively utilizing lubricating oil in a chain guide mechanism used in an engine timing system or the like.

[0003] The oscillating chain guide (tensioner lever 100) described in Patent Document 1 is attached to the engine inner wall E by an oscillating shaft (shoulder bolt SB) inserted into the pivot boss portion 130, and an oil guide groove 131 that guides oil (engine oil O) that has aggregated and adhered to the lever body 120 to the bolt insertion area 132 of the pivot boss portion 130 is formed by cutting out a portion of the pivot boss portion 130 from the outer periphery toward the inner periphery.

[0004] As a result, when the lever is attached to the engine inner wall E with the tip end of the lever in the longitudinal direction facing upward and the pivot support boss portion 130, which is the base end of the lever in the longitudinal direction, facing downward, whether the pivot support boss portion 130 is in close contact with the engine inner wall E or the flange portion Sf of the oscillating shaft (shoulder bolt SB), the oil (engine oil O) that has aggregated and adhered inside the engine inner wall E flows and penetrates thoroughly into the bolt insertion area 132 of the pivot support boss portion 130 from both the front and back of the lever body 120, making maximum use of the oil (engine oil O) inside the engine inner wall E as a lubricant, suppressing the galling, seizure, uneven wear, and friction loss that tend to occur on the oscillating shaft (shoulder bolt SB), thereby demonstrating excellent durability and allowing the traditional chain C to oscillate smoothly in cooperation with the tensioner T and apply appropriate tension to the traditional chain C. Furthermore, since the oil communication passage 123 is integrally molded with the lever body 120 and is formed at the base portion of each of the reinforcing ribs 122 arranged at an angle, the flow of oil (engine oil O) that has aggregated and adhered to the entire surface of the lever body 120 is not blocked by the reinforcing ribs 122 and continues smoothly from the tip end side to the base end side, thereby enabling the oil (engine oil O) that has aggregated and adhered to the entire surface of the lever body 120 to be supplied into the oil guide groove 131 on the base end side with good yield. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-036723 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the structure of the swing chain guide disclosed in Patent Document 1 that effectively utilizes lubricating oil still leaves room for improvement. In other words, the oscillating chain guide described in Patent Document 1 can prevent galling, seizure, uneven wear, friction loss, etc. on the oscillating shaft by collecting oil adhering to the lever body and guiding it to the oscillating shaft, but it cannot collect and guide oil adhering to components of the chain guide mechanism other than the oscillating chain guide.For example, if there is not enough oil applied to the chain, the fixed chain guide on which the chain slides, or the drive sprocket around which the chain is wound, the oil cannot be used efficiently in areas other than the oscillating chain guide, and there is a risk that the amount of oil used will increase.

[0007] The present invention aims to solve these problems by providing a simple structure for a chain guide mechanism frame that can efficiently collect oil adhering to each component of the chain guide mechanism, and that can guide the collected oil to a predetermined position, allowing for efficient use of the oil. [Means for solving the problem]

[0008] The frame of the chain guide mechanism of the present invention has a main body and a driven sprocket holding part that holds a driven sprocket above the main body, the main body having a fixed chain guide and a swinging chain guide holding part to which a swinging chain guide can be attached, the driven sprocket holding part having a fixed side sprocket holding part provided on the fixed chain guide side and a swinging side sprocket holding part provided on the swinging chain guide holding part side, a drive sprocket holding part that holds a drive sprocket is provided below the driven sprocket holding part on the main body, and the main body has concave and / or convex oil passages that extend from above downward to guide oil to above the drive sprocket holding part The lower end of the oil passage on the drive sprocket holding portion side branches into a fixed-side oil passage formed toward the fixed chain guide side and a swing-side oil passage formed toward the swing-side chain guide holding portion side. This solves the above problem. The frame of the chain guide mechanism of the present invention is a frame for a chain guide mechanism having a main body and a driven sprocket holding part that sandwiches a driven sprocket above the main body, wherein the main body has a fixed chain guide and a swinging chain guide holding part to which a swinging chain guide can be attached, the driven sprocket holding part has a fixed sprocket holding part provided on the fixed chain guide side and a swinging sprocket holding part provided on the swinging chain guide holding part side, a drive sprocket holding part that holds a drive sprocket is provided below the driven sprocket holding part on the main body, and the main body has a concave and / or convex oil passage that extends from above downward to guide oil to above the drive sprocket holding part, and the main body has a top guide provided at the top, and the oil passage has an upper oil passage formed from the top guide to between the fixed sprocket holding part and the swinging sprocket holding part, and a lower oil passage formed below the upper oil passage, thereby solving the above problem. [Effects of the Invention]

[0009] The frame of the chain guide mechanism of claim 1 has a concave and / or convex oil passage in the main body that extends from top to bottom and guides oil to above the drive sprocket holding part, so that oil adhering to the top of the main body can be collected in the oil passage and reliably guided to the drive sprocket holding part below the main body, and the drive sprocket can be sufficiently lubricated with a smaller amount of oil than if there was no oil passage. In addition, the lower end of the oil passage on the drive sprocket holding section side branches into a fixed side oil passage formed toward the fixed chain guide side, and a swinging side oil passage formed toward the swinging chain guide holding section side, so that oil adhering to the upper part of the main body can be guided not only to the drive sprocket, but also to the fixed chain guide and swinging chain guide holding section that come into sliding contact with the chain, allowing oil to be supplied to each part more efficiently and sufficient lubrication can be achieved with a smaller amount of oil than if there were no oil passage.

[0010] Claim 2 The frame of such a chain guide mechanism has a concave and / or convex oil passage in the main body that extends from top to bottom and guides oil to above the drive sprocket holding part, so that oil adhering to the top of the main body can be collected in the oil passage and reliably guided to the drive sprocket holding part below the main body, and the drive sprocket can be sufficiently lubricated with a smaller amount of oil than if there were no oil passage. Also,The main body has a top guide, and the oil passage has an upper oil passage formed from the top guide to between the fixed side sprocket holding part and the oscillating side sprocket holding part, and a lower oil passage formed below the upper oil passage.Therefore, oil adhering near the top guide can be reliably collected by the upper oil passage and guided to between the fixed side sprocket holding part and the oscillating side sprocket holding part, and by guiding the oil guided from the upper oil passage to each part from the lower oil passage, oil can be supplied to each part more efficiently.

[0011] Claim 3 According to the configuration described above, the lower end of the upper oil passage is formed to be located directly above the top of the lower oil passage, so even if the lower oil passage branches off along the way, oil is guided directly from the upper oil passage to the lower oil passage before branching, so oil can be reliably and sufficiently guided from the upper oil passage to any of the branch destinations of the lower oil passage. Claim 4 According to the configuration described above, the lower end of the upper oil passage branches so as to be located directly above the fixed-side lower oil passage and directly above the swing-side lower oil passage, so that oil can be reliably and sufficiently guided from the upper oil passage to both the fixed-side lower oil passage and the swing-side lower oil passage.

[0012] Claim 5 According to the configuration described above, the upper oil passage has a fixed-side upper oil passage formed on the fixed-side sprocket holding portion side and a swinging-side upper oil passage formed on the swinging-side sprocket holding portion side, so when a top guide is formed over a wide area above the fixed-side sprocket holding portion and the swinging-side sprocket holding portion, oil adhering over a wide area of the top guide can be sufficiently recovered, and even more oil can be guided to each part via the oil passages. Claim 6According to the configuration described above, the lower end of the fixed-side upper oil passage is formed to be located directly above the fixed-side lower oil passage, and the lower end of the swing-side upper oil passage is formed to be located directly above the swing-side lower oil passage.Therefore, by changing the positions and shapes of the upper ends of the fixed-side upper oil passage and the swing-side upper oil passage and adjusting the amount that each recovers from near the top guide, it is possible to adjust the ratio of oil supplied to the fixed-side lower oil passage and the swing-side lower oil passage, and to guide an amount of oil that is more suitable for lubrication to each part.

[0013] Claim 7 According to the configuration described above, the lower end of the swing-side oil passage is formed to be located directly above the drive sprocket holding portion, so that oil can be reliably guided from the upper part of the main body portion to the drive sprocket holding portion. Claim 8 According to the configuration described above, the oil passage is formed in a bead shape, so that a concave or convex oil passage can be formed on either the front or back of the main body portion in a single machining operation. Furthermore, by forming a bead-shaped oil passage on the surface of the main body, the strength of the main body itself can be improved. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is an overall view of a frame 100 of a chain guide mechanism according to an embodiment of the present invention. [Figure 2] 1 is an overall view of a state in which a frame 100 of a chain guide mechanism according to an embodiment of the present invention is attached to an engine. DETAILED DESCRIPTION OF THE INVENTION

[0015] A frame 100 of a chain guide mechanism according to one embodiment of the present invention will be described below with reference to the drawings. For the sake of explanation, the engine and the members connecting the engine to the frame 100 are not shown in FIG.

[0016] As shown in Figure 1, the frame 100 of the chain guide mechanism has a main body 110, a top guide 115 provided on the top surface of the main body 110, a fixed chain guide 111 provided on one side of the main body 110, and a swinging chain guide holding part 114 to which a swinging chain guide 112 can be attached on the side of the main body 110 opposite the fixed chain guide 111.A fixed side sprocket holding part 120 is provided on the fixed chain guide 111 side of the top of the main body 110, a swinging side sprocket holding part 121 is provided on the swinging chain guide holding part 114 side of the top of the main body 110, and a drive sprocket holding part 122 capable of holding a drive sprocket DS is provided on the bottom of the main body 110.

[0017] The main body 110 is provided at various locations with mounting holes H1, H2, and H3 for fixing to an engine (not shown). The fixed side upper oil passage 130 and the oscillating side upper oil passage 131 are bead-shaped oil passages that extend vertically from near the top guide 115 of the main body 110 to between the fixed side sprocket holding portion 120 and the oscillating side sprocket holding portion 121, respectively, to near the mounting hole H2, i.e., they are formed convexly from one side of the main body 110 and concavely from the other side.

[0018] In addition, below the mounting hole H2 are provided a fixed side lower oil passage 132, which is an oil passage that gradually extends downward from near the mounting hole H2 and toward the fixed chain guide 111 side, and a swinging side lower oil passage 133, which is an oil passage that gradually extends downward from near the mounting hole H2, passing through the swinging chain guide holding portion 114 side of the main body portion 110, to near the drive sprocket holding portion 122, and the fixed side lower oil passage 132 and the swinging side lower oil passage 133 are connected at their uppermost points near the mounting hole H2. Furthermore, below the mounting hole H3, an auxiliary oil passage 134, which is an oil passage aligned with the lower part of the swing-side lower oil passage 133, is formed. The fixed-side lower oil passage 132, the swing-side lower oil passage 133, and the auxiliary oil passage 134 are also formed in a bead shape, similar to the fixed-side upper oil passage 130 and the swing-side upper oil passage 131. As described above, the fixed side upper oil passage 130, the swing side upper oil passage 131, the fixed side lower oil passage 132, the swing side lower oil passage 133, and the auxiliary oil passage 134 are formed in a bead shape, which suppresses distortion of the main body portion 110 and improves its strength.

[0019] Next, the guidance of oil EL by the frame 100 of the chain guide mechanism according to one embodiment of the present invention will be described with reference to FIG.

[0020] First, as shown in Figure 2, the frame 100 of the chain guide mechanism holds the driven sprocket S1 in the fixed sprocket holding portion 120, the driven sprocket S2 in the swinging sprocket holding portion 121, and the drive sprocket DS in the drive sprocket holding portion 122, and the chain CH is wound around the driven sprockets S1, S2 and the drive sprocket DS. The swingable chain guide 112 is swingably connected to a swingable chain guide holder 114 via a swing shaft 113, and presses against the chain CH to generate a predetermined tension in the chain CH. The chain CH is passed around a fixed chain guide 111, a swingable chain guide 112, and a top guide 115 so as to slide. In this state, the frame 100 of the chain guide mechanism is attached to the engine (not shown) via the attachment holes H1, H2, and H3.

[0021] The chain guide mechanism attached to the engine (not shown) is supplied with oil EL to lubricate the chain CH and various parts of the chain guide mechanism, and some of the oil EL is splashed and adheres directly to the main body 110 due to the force of the spray when it is supplied to the chain guide mechanism, the rotation of the driven sprockets S1, S2 and drive sprocket DS, and the sliding of the chain CH against the fixed chain guide 111, oscillating chain guide 112 and top guide 115, and some of the oil EL floating in a mist around the frame 100 of the chain guide mechanism also adheres to the main body 110. Although it depends on the supply position of the oil EL, the oil EL adheres mostly to the upper part of the main body 110 and gradually flows downward along the main body 110 due to gravity.

[0022] At this time, since the fixed side upper oil passage 130 and the swinging side upper oil passage 131 are provided at the top of the main body 110, oil EL1 adhering near the fixed side sprocket holding portion 120 of the top guide 115 is collected in the fixed side upper oil passage 130, and oil EL2 adhering near the swinging side sprocket holding portion 121 of the top guide 115 is collected in the swinging side upper oil passage 131, and oil EL1 and EL2 reach the lower end along the bead shapes of the fixed side upper oil passage 130 and the swinging side upper oil passage 131, respectively, and then flow downward in their respective oil passages. Furthermore, the fixed side upper oil passage 130 and the oscillating side upper oil passage 131 are formed so that their upper ends are closer to the fixed side sprocket holding portion 120 and the oscillating side sprocket holding portion 121, respectively, and their lower ends are closer to the center of the main body portion 110, so that oil EL1 and EL2 adhering to the main body portion 110 located above the fixed side upper oil passage 130 and the oscillating side upper oil passage 131 can also be efficiently collected over a wide area.

[0023] Oil EL1 and EL2 that flow downward from the lower ends of the fixed side upper oil passage 130 and the swing side upper oil passage 131 are collected in the fixed side lower oil passage 132 and the swing side lower oil passage 133, respectively, and flow downward from the lower ends along the bead shapes of the fixed side lower oil passage 132 and the swing side lower oil passage 133. Since the lower end of the fixed side lower oil passage 132 is located above the fixed chain guide 111, the oil EL1 collected near the top guide 115 is supplied to the fixed chain guide 111, further improving the sliding performance between the chain CH and the fixed chain guide 111. In addition, since the lower end of the swing-side lower oil passage 133 is located directly above the drive sprocket holding portion 122, the oil EL2 collected near the top guide 115 is supplied to the drive sprocket DS, allowing the drive sprocket DS to be efficiently lubricated and oil EL2 to be supplied to the chain CH via the drive sprocket DS.

[0024] The oscillating side lower oil passage 133 is formed along the oscillating chain guide holding portion 114 side of the main body portion 110 up to just above the drive sprocket holding portion 122, and therefore cannot recover oil EL3 that has adhered above the mounting hole H3 of the main body portion 110. However, since an auxiliary oil passage 134 is formed below the mounting hole H3, the oil EL3 can be recovered in the auxiliary oil passage 134. Furthermore, since the lower end of the auxiliary oil passage 134 is located directly above the drive sprocket holding portion 122, oil EL3 can also be supplied to the drive sprocket DS, allowing the drive sprocket DS to be lubricated even more efficiently.

[0025] As described above, by collecting the oil EL adhering to the main body 110 through the fixed side upper oil passage 130, the oscillating side upper oil passage 131, the fixed side lower oil passage 132, the oscillating side lower oil passage 133, and the auxiliary oil passage 134 and guiding it to a predetermined location, each component such as the chain CH and the drive sprocket DS can be efficiently lubricated with a smaller amount of oil EL than if each oil passage were not provided.

[0026] Although one embodiment of the present invention has been described in detail above, the present invention is not limited to the above embodiment, and various design modifications can be made without departing from the present invention as set forth in the claims.

[0027] In the above-described embodiment, it was explained that the fixed side upper oil passage and the swinging side upper oil passage are formed in the upper part of the main body, but the configuration of the oil passages provided in the upper part of the main body is not limited to this, and for example, the fixed side upper oil passage and the swinging side upper oil passage may be configured to merge along the way, or a single oil passage may be configured to branch off to the fixed side sprocket holding part side and the swinging side sprocket holding part side as it moves downward from the top of the main body, or only one oil passage may be formed in the main body. Furthermore, in the above-described embodiment, it has been described that a fixed-side lower oil passage and a swing-side lower oil passage are formed below the fixed-side upper oil passage and the swing-side upper oil passage, and that the upper end of the fixed-side lower oil passage and the upper end of the swing-side lower oil passage are connected, but the configuration of the fixed-side lower oil passage and the swing-side lower oil passage is not limited to this, and for example, the fixed-side lower oil passage and the swing-side lower oil passage do not have to be connected, or the fixed-side lower oil passage and the swing-side lower oil passage do not have to be formed, and the lower end of the fixed-side upper oil passage and the upper end of the fixed-side lower oil passage may be connected.

[0028] In addition, in the above-described embodiment, the lower end of the fixed-side lower oil passage is described as being located at the top of the fixed chain guide, but the position of the lower end of the fixed-side lower oil passage is not limited to this, and for example, it may be located at the bottom of the fixed chain guide or directly above the mounting hole H3. Furthermore, in the above-described embodiment, the lower end of the swing-side lower oil passage is described as being located directly above the drive sprocket holding portion, but the position of the lower end of the swing-side lower oil passage is not limited to this, and for example, it may be located directly above the swing chain guide holding portion, or it may branch off midway and be located both directly above the swing chain guide holding portion and directly above the drive sprocket holding portion.

[0029] Furthermore, in the above-described embodiment, it has been described that an auxiliary oil passage is formed below the mounting hole H3, but the configuration of the auxiliary oil passage is not limited to this. For example, there may be no auxiliary oil passage, and the auxiliary oil passage may be formed above the mounting hole H3, with the lower end of the auxiliary oil passage connected to merge with the swing-side lower oil passage. In addition, in the above-described embodiment, a top guide is provided on the upper surface of the main body, but the configuration of the frame of the chain guide mechanism is not limited to this, and for example, the top guide may not be provided.

[0030] Furthermore, in the above-described embodiment, each oil passage is described as being formed in a bead shape, but the configuration of each oil passage is not limited to this, and for example, each oil passage may be formed in a concave groove shape on both sides of the main body portion, or in a convex shape protruding from both sides of the main body portion, or each oil passage may be formed on only one side of the main body portion. [Explanation of symbols]

[0031] 100 ··· Chain guide mechanism frame 110 Main body 111 Fixed chain guide 112 Swinging chain guide 113 ··· Oscillating shaft 114 Swinging chain guide holder 115 ··· Top Guide 120 Fixed sprocket holder 121 ··· Oscillating side sprocket holding portion 122 Drive sprocket holder 130 ... Fixed side upper oil passage (oil passage) 131 ··· Upper oil passage on swing side (oil passage) 132 ... Fixed side lower oil passage (oil passage) 133 ··· Lower oil passage on swing side (oil passage) 134 ... Auxiliary oilway (oilway) S1, S2... Driven sprockets DS ··· Drive sprocket CH Chain H1, H2, H3... Mounting holes EL1, EL2, EL3... Oil

Claims

1. A frame of a chain guide mechanism having a main body and a driven sprocket holding portion that holds a driven sprocket above the main body, The main body portion has a fixed chain guide and a swinging chain guide holding portion to which a swinging chain guide can be attached, The driven sprocket holding portion has a fixed-side sprocket holding portion provided on the fixed chain guide side and a swinging-side sprocket holding portion provided on the swinging chain guide holding portion side, a drive sprocket holding portion for holding a drive sprocket is provided below the driven sprocket holding portion of the main body, The main body portion has a concave and / or convex oil passage extending downward to guide oil to above the drive sprocket holding portion, A frame for a chain guide mechanism, characterized in that the lower end of the oil passage on the drive sprocket holding portion side branches into a fixed side oil passage formed toward the fixed chain guide side and a swinging side oil passage formed toward the swinging chain guide holding portion side.

2. A frame of a chain guide mechanism having a main body and a driven sprocket holding portion that clamps a driven sprocket above the main body, The main body portion has a fixed chain guide and a swinging chain guide holding portion to which a swinging chain guide can be attached, The driven sprocket holding portion has a fixed-side sprocket holding portion provided on the fixed chain guide side and a swinging-side sprocket holding portion provided on the swinging chain guide holding portion side, a drive sprocket holding portion for holding a drive sprocket is provided below the driven sprocket holding portion of the main body, The main body portion has a concave and / or convex oil passage extending downward to guide oil to above the drive sprocket holding portion, The main body has a top guide provided at an upper portion thereof, A frame for a chain guide mechanism, characterized in that the oil passage has an upper oil passage formed from the top guide to between the fixed side sprocket holding portion and the oscillating side sprocket holding portion, and a lower oil passage formed below the upper oil passage.

3. 3. The frame of a chain guide mechanism according to claim 2, wherein the lower end of the upper oil passage is formed so as to be located immediately above the uppermost portion of the lower oil passage.

4. The lower oil passage has a fixed-side lower oil passage formed toward the fixed chain guide side and a swing-side lower oil passage formed toward the swing-side chain guide holding portion side, 3. The frame of claim 2, wherein the lower end of the upper oil passage is branched so as to be located immediately above the fixed-side lower oil passage and immediately above the swing-side lower oil passage.

5. A frame for a chain guide mechanism as described in any one of claims 2 to 4, characterized in that the upper oil passage has a fixed-side upper oil passage formed on the fixed-side sprocket holding portion side and a swing-side upper oil passage formed on the swing-side sprocket holding portion side.

6. The lower oil passage has a fixed-side lower oil passage formed toward the fixed chain guide side and a swing-side lower oil passage formed toward the swing-side chain guide holding part side, The lower end of the upper oil passage branches so as to be located immediately above the fixed-side lower oil passage and immediately above the swing-side lower oil passage, a lower end of the fixed-side upper oil passage is formed to be located directly above the fixed-side lower oil passage, 6. The frame of a chain guide mechanism according to claim 5, wherein the lower end of the upper pivot-side oil passage is formed so as to be positioned directly above the lower pivot-side oil passage.

7. The lower end of the oil passage on the drive sprocket holding portion side branches into a fixed side oil passage formed toward the fixed chain guide side and a swinging side oil passage formed toward the swinging chain guide holding portion side.

7. The frame for a chain guide mechanism according to claim 1, wherein a lower end of the pivot-side oil passage is formed so as to be positioned directly above the drive sprocket holding portion.

8. 8. The frame for a chain guide mechanism according to claim 1, wherein the oil passage is formed in a bead shape.

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