Roller tappet for engine and engine

Abstract

The invention relates to the technical field of diesel engines, and discloses a roller tappet for an engine and the engine, the roller tappet comprises a tappet body, the bottom end of the tappet body is connected with a wheel shaft through two groups of connecting parts, the outer side of the wheel shaft is sequentially sleeved with an inner roller and an outer roller, and the distances from the two groups of connecting parts to the outer side surface of the tappet body are different; the inner cavity of the tappet body is communicated with the outer side space of the outer roller through a first oil duct; an annular groove is formed in the outer side of the tappet body, a roller lubricating oil channel is inwards formed in the position, at the annular groove, of the tappet body and extends into the wheel shaft, the roller lubricating oil channel extends towards the two sides in the wheel shaft to penetrate through the wheel shaft, and penetrating channels are formed in the corresponding positions of the inner roller, so that forced lubrication of all contact faces is achieved, and the lubricating condition is guaranteed. Friction pair abrasion is reduced, the performance requirement of part materials is lowered, and the reliability and stability of the whole part are improved; and one group of positioning brackets positions two groups of roller tappets, so that every two cylinders share one group of positioning brackets, the inner side surfaces of tappet holes do not need to be processed, and the processing difficulty is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of diesel engines, in particular to a roller tappet for an engine and an engine. Background Art

[0002] The tappet is a key part in the engine valve train. It is divided into flat-bottomed tappets and roller tappets according to the structural type. The flat-bottomed tappet contacts the cam through the bottom plane, which is sliding friction; the roller tappet contacts the cam through the roller, which is rolling friction. The inventor found that some roller tappets have rollers including double rollers (inner roller and outer roller) to improve the stability of roller operation, but in terms of lubrication and friction and wear, splash lubrication or partial forced lubrication is mostly used, which cannot ensure good lubrication of each friction pair, and the friction effect is poor, resulting in problems such as excessively high material performance requirements and poor reliability. In addition, the existing roller tappet will set a guide key on the outside of the tappet body to achieve the positioning of the roller tappet, but this method requires the corresponding machining of the guide groove on the inner side of each tappet hole, making the body difficult to process. Summary of the invention

[0003] In view of the deficiencies in the prior art, an object of the present invention is to provide a roller tappet for an engine.

[0004] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0005] A roller tappet for an engine comprises a tappet body, the bottom end of the tappet body is connected to a wheel axle via two groups of connecting parts, an inner roller and an outer roller are sequentially sleeved on the outside of the wheel axle, and the distances from the two groups of connecting parts to the outer side surface of the tappet body are different; the inner cavity of the tappet body is connected to the outer space of the outer roller via a first oil channel; an annular groove is arranged on the outside of the tappet body, a roller lubrication oil channel is opened inwardly at the annular groove of the tappet body, the roller lubrication oil channel extends to the inside of the wheel axle, the roller lubrication oil channel extends to both sides inside the wheel axle to penetrate the wheel axle, and a through channel is arranged at a corresponding position on the inner roller to realize forced lubrication of each contact surface.

[0006] As a further implementation method, the bottom of the inner cavity of the push rod is funnel-shaped, and its top is connected to the upper push rod oil channel hole. The first oil channel is vertically arranged and the top is connected to the bottom of the inner cavity of the push rod; the first oil channel is arranged near the bottom end and near the middle position of the outer side of the outer roller.

[0007] As a further implementation method, a second oil channel and a third oil channel are vertically arranged on both sides of the first oil channel. The top ends of the second oil channel and the third oil channel are connected to the conical surface of the inner cavity of the push rod, and the diameter is larger than the diameter of the first oil channel. The bottom ends are connected to the outer edge of the outer roller.

[0008] As a further implementation, a plane structure is processed on the outer side of the tappet body, the annular groove passes through the plane structure, and the oil channel hole of the roller lubrication oil channel is located at the intersection of the plane structure and the annular groove.

[0009] As a further implementation, the roller lubrication oil channel includes a fourth oil channel, a fifth oil channel and a sixth oil channel which are connected in sequence, the fourth oil channel is arranged obliquely, and the sixth oil channel is arranged vertically and located inside the wheel axle.

[0010] As a further implementation, the bottom end of the sixth oil channel is vertically connected to the seventh oil channel, both ends of the seventh oil channel penetrate the wheel axle, and the through channel is arranged on the inner roller at a position corresponding to the seventh oil channel.

[0011] In the second aspect, an engine is a V-type engine, including a body, on which are processed a plurality of tappet holes for installing a roller tappet for an engine as described above, wherein every two tappet holes are adapted to work with a group of oil cylinders, and a positioning hole is processed at the lower end surface between each group of tappet holes, and a group of positioning brackets are fixed between the corresponding positioning holes at the two cylinders, and positioning blocks are provided at both ends of the positioning brackets, and the angle between the two groups of positioning blocks is V-shaped, and the side surfaces of the positioning blocks are used to abut against the outer side surfaces of the connecting part of the roller tappet to guide the sliding of the roller tappet in the tappet hole.

[0012] As a further implementation, the positioning bracket includes a connecting rod, and fixing parts are provided at both ends of the connecting rod. Positioning blocks are provided outside the fixing parts, and the shape of the fixing parts is adapted to the positioning holes.

[0013] As a further implementation, the positioning hole includes a countersunk hole, a thread hole is further processed in the middle of the countersunk hole, the fixing part abuts against the countersunk hole, and the fixing part and the positioning hole are fixed by a connecting piece and the thread hole.

[0014] As a further implementation method, the outer side surfaces of the two sets of connecting parts of each roller tappet are respectively positioning surfaces and non-positioning surfaces. The distance between the positioning surfaces and the rotation center of the tappet body is greater than the distance between the non-positioning surfaces and the rotation center of the tappet body. The positioning surfaces are used to abut the side surfaces of the positioning block.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. The inner cavity of the tappet body of the present invention is connected with the outer space of the outer roller through the first oil channel; an annular groove is provided on the outer side of the tappet body, and a roller lubrication oil channel is opened inwardly from the annular groove of the tappet body, and the roller lubrication oil channel extends to the inside of the wheel axle, and the roller lubrication oil channel extends to both sides inside the wheel axle to penetrate the wheel axle, and a through channel is provided at the corresponding position on the inner roller, so as to realize forced lubrication of each contact surface, ensure lubrication conditions, reduce friction pair wear, reduce part material performance requirements, and improve the reliability and stability of the overall components.

[0017] 2. The present invention adopts a group of positioning brackets to position two groups of roller tappets, so that every two cylinders share one group of positioning brackets. The positioning bracket adapter hole is located on the lower end surface of the tappet hole in a vertical direction, which is easy to process. There is no need to process the inner side surface of the tappet hole, thereby reducing the processing difficulty.

[0018] 3. The annular groove and the plane structure of the present invention are arranged. The annular groove allows the lubricating oil to be retained here, which can meet the lubrication conditions of the circumference of the tappet body and the tappet hole bracket; at the same time, a certain amount of lubricating oil can be stored to ensure that it continuously enters the outer side of the tappet body and the inner side of the tappet body for lubrication; with the arrangement of the plane structure, the lubricating oil supply hole of the body and the plane form a cavity within the up and down movement of the tappet, ensuring smooth oil supply; at the same time, it can effectively improve the processing technology of the fourth oil channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0020] Figure 1 is a front view of a roller tappet in an embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of the internal structure of the roller tappet in an embodiment of the present invention;

[0022] Figure 3 is a schematic diagram of a partial structure of a roller tappet in an embodiment of the present invention;

[0023] Figure 4 1 is a schematic structural diagram of a roller portion of a roller tappet in an embodiment of the present invention;

[0024] Figure 5 is a schematic diagram of the structure of the cooperation between the positioning bracket and the roller tappet in an embodiment of the present invention;

[0025] Figure 6 It is a schematic diagram of the local structure of the machine body in an embodiment of the present invention;

[0026] Figure 7 It is a schematic diagram of the structure of the positioning bracket in an embodiment of the present invention.

[0027] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0028] Wherein: 1. Machine body, 2. Push rod body, 3. Positioning bracket, 11. Countersunk hole, 12. Threaded hole, 13. Push rod hole, 21. Positioning surface, 22. Non-positioning surface, 23. Wheel axle, 24. Inner roller, 25. Outer roller, 26. Plane structure, 27. Annular groove; 31. Connecting rod, 32. Fixing part, 33. Positioning block; 4. First oil passage, 5. Second oil passage, 6. Third oil passage, 7. Fourth oil passage, 8. Fifth oil passage, 9. Sixth oil passage, 10. Seventh oil passage; 41. First oil hole, 51. Second oil hole, 61. Third oil hole, 71. Fourth oil hole, 81. Fifth oil hole, 91. Sixth oil hole, 101. Seventh oil hole. DETAILED DESCRIPTION

[0029] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0030] Embodiment 1

[0031] In a typical embodiment of the present invention, reference is made to Figure 1-Figure 4 As shown, a roller tappet for an engine comprises a tappet body 2 and a wheel axle 23, and a double roller is arranged on the outer side of the wheel axle 23.

[0032] like Figure 2 As shown, the tappet body 2 is cylindrical in shape, and its bottom end is connected to the axle 23 through two sets of connecting parts. The double rollers are an inner roller 24 and an outer roller 25 which are sequentially sleeved on the outer side of the axle. The inner roller 24 can rotate on the axle, and the outer roller 25 can rotate relative to the inner roller 24. Figure 1 As shown, the two groups of connecting parts are in the form of ear plate structures, and the axle 23 is installed between the connecting parts through the axle hole, and the axle 23 does not extend beyond the outer side surface of the connecting parts.

[0033] like Figure 2 As shown, an inner cavity is provided inside the tappet body 2, the bottom of the inner cavity of the tappet body 2 is funnel-shaped, and the top end thereof is connected to the upper tappet oil passage hole, so that the oil in the upper tappet oil passage hole can enter the inner cavity.

[0034] In order to perform forced lubrication on each friction pair of the tappet body 2, the inner cavity of the tappet body 2 is connected to the outer space of the outer roller 25 through the first oil passage 4. Figure 2 As shown, the first oil passage 4 is provided in the tappet body 2 and is located below the inner cavity. The first oil passage 4 is vertically arranged and communicates with the bottom end of the funnel-shaped inner cavity to form a first oil hole 41. The through hole at the lower end of the first oil passage 4 is located on the tappet body 2 between the two sets of connecting plates, so that the lubricating oil can lubricate the outer side surface of the outer roller 25. The first oil passage 4 is arranged near the bottom end and near the middle position of the outer side of the outer roller 25, so that the lubricating oil first flows to the middle position of the outer side of the outer roller 25.

[0035] like Figure 2 As shown, a second oil passage 5 and a third oil passage 6 are vertically provided on both sides of the first oil passage 4. The second oil passage 5 and the third oil passage 6 are also vertically arranged. The top ends of the second oil passage 5 and the third oil passage 6 are connected to the conical surface of the inner cavity of the tappet body 2, and the bottom ends are connected to the outer edge position of the outer roller 25. Specifically, the second oil passage is connected to the inner cavity through the second oil hole 51, and the third oil passage 6 is connected to the inner cavity through the third oil hole 61.

[0036] The inner diameters of the second oil passage 5 and the third oil passage 6 are the same and both are larger than the inner diameter of the first oil passage 4. The oil from the tappet is supplied to the middle position of the outer roller 25 through the first oil passage 4 to ensure that the heavy-load area is supplied with oil in advance; when the oil supply accumulates to a certain extent, the first oil passage 4 is filled with lubricating oil, and the lubricating oil remains at the bottom of the inner cavity. The lubricating oil covers the second oil hole 51 and the third oil hole 61, and flows to the two sides of the outer roller through the second oil passage 5 and the third oil passage 6 respectively, and the excess lubricating oil flows to the oil pan through the third oil passage 6 and the second oil passage 5. By setting the first oil passage 4, the second oil passage 5, and the third oil passage 6, the outer side of the outer roller 25 can be fully lubricated to ensure the stability of the fit between the outer roller 25 and the cam.

[0037] like Figure 2 and Figure 3 As shown, an annular groove 27 is provided on the outer side of the tappet body 2, and a roller lubrication oil channel is opened inwardly at the annular groove 27 of the tappet body 2, and the roller lubrication oil channel extends to the inside of the wheel axle 23. The roller lubrication oil channel extends to both sides inside the wheel axle 23 to penetrate the wheel axle 23, and a through channel is provided at a corresponding position on the inner roller 24 to realize forced lubrication of each contact surface.

[0038] The annular groove 27 is arranged in the middle position of the outer side of the tappet body 2. A rectangular plane structure 26 is processed on the outer side of the tappet body 2. The rectangular plane structure 26 is arranged along the length direction of the tappet body 2 and is arranged perpendicular to the annular groove 27. The annular groove 27 passes through the plane structure 26, and the oil channel hole of the roller lubrication oil channel is located at the intersection of the plane structure and the annular groove.

[0039] The plane structure 26 and the annular groove 27 form a cavity with the body tappet hole 13 to ensure that the lubricating oil in the body oil passage smoothly enters the roller lubricating oil passage. The lubricating oil entering between the tappet hole 13 and the tappet body 2 can be retained in the annular groove 27. As the tappet body 2 slides in the tappet hole 13, the lubricating oil can be forced to lubricate the friction pair between the tappet body 2 and the tappet hole 13.

[0040] like Figure 3As shown, the roller lubrication oil passage includes a fourth oil passage 7, a fifth oil passage 8 and a sixth oil passage 9 which are connected in sequence. The fourth oil passage 7 is arranged obliquely, and a fourth oil hole 71 is formed at the intersection of the plane structure 26 and the annular groove 27. The fifth oil passage is arranged vertically and is located below the inner cavity inside the tappet body 2. The sixth oil passage 9 is arranged vertically and is located inside the wheel axle. The lower end of the fifth oil passage 8 extends into the connecting portion and is connected to the sixth oil passage inside the wheel axle 23 through the fifth oil hole 81. The upper end of the sixth oil passage 9 is the sixth oil hole 91. The lubricating oil entering the annular groove passes through the fourth oil hole 71, the fourth oil passage 7, the fifth oil passage 8, the fifth oil hole 81, the sixth oil hole 91, and the sixth oil passage 9 in sequence and enters the wheel axle. The bottom end of the sixth oil passage 9 is close to the axis of the wheel axle and is vertically connected to the seventh oil passage 10. The seventh oil passage 10 and the sixth oil passage 9 are in an inverted T shape. Both ends of the seventh oil passage penetrate the axle and are distributed along the diameter line of the axle 23, so that the lubricating oil entering the seventh oil passage 10 enters the friction contact surface between the axle and the inner roller through the seventh oil holes 101 at both ends thereof for lubrication.

[0041] like Figure 4 As shown, in order to achieve lubrication between the inner roller 24 and the outer roller 25, the through channel is set on the inner roller 24 at the position corresponding to the seventh oil channel 10, and the length of the through channel is the wheel thickness of the outer roller 25, so that the lubricating oil in the seventh oil channel 10 can enter the friction contact surface between the inner roller 24 and the outer roller 25 through the through channel.

[0042] The arrangement of the planar structure 26 in this embodiment can better improve the processing technology of the fourth oil channel 7 .

[0043] like Figure 2 As shown, the distances between the two sets of connection parts and the outer side of the tappet body 2 are different, so that the outer side of one set of connection parts is a positioning surface, and the outer side of the other set of connection parts is a non-positioning surface. To prevent the roller tappet from being assembled incorrectly, the positioning surface 21 is used to cooperate with the side of the end of the positioning bracket 3.

[0044] The roller tappet adopts forced lubrication of each contact surface to ensure lubrication conditions, reduce friction pair wear, lower part material performance requirements, and improve the reliability and stability of the overall components.

[0045] Embodiment 2

[0046] In a typical embodiment of the present invention, an engine is a V-type engine, comprising a body 1, on which a plurality of tappet holes 13 are processed for installing the roller tappet for the engine as described in the first embodiment.

[0047] like Figure 5 and Figure 6As shown, every two tappet holes 13 are adapted to work with a group of oil cylinders, and a positioning hole is processed at the lower end surface of the body between each group of tappet holes 13, and the end surface of the tappet hole 13 is in the same plane as the end surface of the positioning hole. A group of positioning brackets is fixed between the corresponding positioning holes of the two cylinders, and positioning blocks 33 are provided at both ends of the positioning brackets. The angle between the two groups of positioning blocks 33 is V-shaped, and the two side surfaces of the positioning blocks 33 are used to abut against the outer side surface of the connecting part of the roller tappet to guide the sliding of the roller tappet in the tappet hole.

[0048] like Figure 7 As shown, the positioning bracket 3 includes a connecting rod 31, and fixing parts 32 are provided at both ends of the connecting rod 31. A positioning block 33 is provided outside the fixing part 32, and the shape of the fixing part 32 is adapted to the positioning hole.

[0049] The fixing portion 32 is a cylindrical structure, and a positioning pin is provided at one end of the cylindrical structure away from the positioning block 33. Figure 6 As shown, the positioning hole includes a countersunk hole 11, and a threaded hole 12 is further processed in the middle position of the countersunk hole 11. The positioning pin on the fixing part abuts against the countersunk hole. The fixing part is provided with an internal thread throughout, and the fixing part and the positioning hole are fixed by a connecting piece and a threaded hole, so as to realize the installation of the positioning bracket 3 on the machine body.

[0050] The fixed block is a plate-like structure with two flat sides. The structure after the tappet body and positioning bracket are installed is shown in the figure below. Figure 5 As shown, the outer side surfaces of the two groups of connecting parts of each roller tappet are respectively a positioning surface 21 and a non-positioning surface 22. The distance between the positioning surface 21 and the rotation center of the tappet body is greater than the distance between the non-positioning surface 22 and the rotation center of the tappet body. The positioning surface is used to abut the side surface of the positioning block. The two side surfaces of the positioning block 33 at each end of the positioning bracket cooperate with the positioning surface 21 to realize a group of positioning brackets 3 and simultaneously position four groups of roller tappets, thereby realizing that each two cylinders share a group of positioning brackets 3, and the positioning brackets 3 and the body are positioned by clearance fit. The positioning hole is in the vertical direction, which is convenient for clamping and precision assurance during the body processing process.

[0051] By providing the positioning bracket 3 , there is no need to process the inner side surface of the tappet hole 13 , thereby reducing the processing difficulty.

[0052] The roller tappet oil hole of this embodiment is designed asymmetrically. To ensure the correctness of installation, the main body design adopts a fool-proof design; the roller tappet positioning surface and non-positioning surface are at different distances from the rotation center of the tappet body, ensuring that the roller tappet positioning surface and non-positioning surface cannot be installed if they are reversed. The V-type machine roller tappet adopts the positioning bracket positioning method, which can reduce the difficulty of machine body processing and improve the positioning accuracy of parts.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A roller tappet for an engine, characterized in that: It includes a tappet body, the bottom end of which is connected to the wheel axle through two groups of connecting parts, and an inner roller and an outer roller are sequentially sleeved on the outside of the wheel axle, and the distances from the two groups of connecting parts to the outer side surface of the tappet body are different; the inner cavity of the tappet body is connected with the outer space of the outer roller through a first oil channel; an annular groove is provided on the outside of the tappet body, and a roller lubrication oil channel is opened inwardly at the annular groove of the tappet body, and the roller lubrication oil channel extends to the inside of the wheel axle, and the roller lubrication oil channel extends to both sides inside the wheel axle to penetrate the wheel axle, and a through channel is provided at a corresponding position on the inner roller to realize forced lubrication of each contact surface.

2. The roller tappet for an engine according to claim 1, characterized in that: The bottom of the inner cavity of the tappet body is funnel-shaped, and its top is connected to the upper tappet oil channel hole. The first oil channel is vertically arranged and the top is connected to the bottom of the inner cavity of the tappet body; the first oil channel is arranged near the bottom end and near the middle position of the outer side of the outer roller.

3. The roller tappet for an engine according to claim 2, characterized in that: The second oil channel and the third oil channel are vertically arranged on both sides of the first oil channel. The top ends of the second oil channel and the third oil channel are connected to the conical surface of the inner cavity of the tappet body, and the diameter is larger than the diameter of the first oil channel. The bottom ends are connected to the outer edge of the outer roller.

4. The roller tappet for an engine according to claim 1, characterized in that: A plane structure is processed on the outer side of the tappet body, the annular groove passes through the plane structure, and the oil channel hole of the roller lubrication oil channel is located at the intersection of the plane structure and the annular groove.

5. The roller tappet for an engine according to claim 4, characterized in that: The roller lubrication oil passage comprises a fourth oil passage, a fifth oil passage and a sixth oil passage which are connected in sequence, the fourth oil passage is arranged obliquely, and the sixth oil passage is arranged vertically and located inside the wheel axle.

6. The roller tappet for an engine according to claim 5, characterized in that: The bottom end of the sixth oil passage is vertically connected to the seventh oil passage, both ends of the seventh oil passage penetrate the wheel axle, and the through passage is arranged on the inner roller at a position corresponding to the seventh oil passage.

7. An engine, characterized in that: The engine is a V-type engine, including a body, on which are processed a plurality of tappet holes for installing the roller tappet for the engine as described in any one of claims 1-6, wherein every two tappet holes are adapted to work with a group of oil cylinders, and a positioning hole is processed at the lower end surface between each group of tappet holes, and a group of positioning brackets are fixed between the corresponding positioning holes at the two cylinders, and positioning blocks are provided at both ends of the positioning brackets, and the angle between the two groups of positioning blocks is V-shaped, and the two side surfaces of the positioning blocks are used to abut against the outer side surfaces of the connecting part of the roller tappet to guide the sliding of the roller tappet in the tappet hole.

8. An engine according to claim 7, characterized in that: The positioning bracket comprises a connecting rod, and fixing parts are arranged at both ends of the connecting rod. Positioning blocks are arranged outside the fixing parts, and the shape of the fixing parts is adapted to the positioning holes.

9. An engine according to claim 8, characterized in that: The positioning hole comprises a countersunk hole, a thread hole is further processed at the middle position of the countersunk hole, the fixing part abuts against the countersunk hole, and the fixing part and the positioning hole are fixed by the connecting piece and the thread hole.

10. An engine according to claim 9, characterized in that: The outer side surfaces of the two sets of connecting parts of each roller tappet are respectively a positioning surface and a non-positioning surface. The distance between the positioning surface and the rotation center of the tappet body is greater than the distance between the non-positioning surface and the rotation center of the tappet body. The positioning surface is used to abut the side surface of the positioning block.

Images