High-pressure oil pump drive device and engine

Abstract

The application provides a high-pressure oil pump driving device and an engine, and relates to the technical field of engines. The high-pressure oil pump driving device comprises a cylinder cover and a tappet barrel. The cylinder cover is provided with an oil channel and a mounting cavity. The oil channel is in communication with the mounting cavity. The tappet barrel is mounted in the mounting cavity and can move along the axial direction of the mounting cavity. The gap between the inner wall of the mounting cavity and the outer peripheral wall of the tappet barrel constitutes an oil supply part. The oil supply part is used for supplying oil flow. The width of the oil supply part gradually increases from one side to the other side in the radial direction of the tappet barrel. Through the arrangement, an oil film is formed on the outer peripheral wall of the tappet barrel, the tappet barrel is actively lubricated, and the cooling and lubrication effects on the tappet barrel are improved. The oil film formed on the outer peripheral wall of the tappet barrel is more stable, sufficient and uniform. The supporting area of the oil film is improved. The problem of uneven stress on the outer peripheral wall of the tappet barrel is improved. The problem of NVH sound quality of the high-pressure oil pump driving device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the engine technical field, and particularly relates to a high-pressure oil pump driving device and an engine. BACKGROUND

[0002] With the improvement of the light weight of the whole vehicle and the demand of the engine power, economy and emission performance, the high-pressure direct injection engine gradually becomes the mainstream of the conventional internal combustion engine. Compared with the conventional naturally aspirated engine, the high-pressure direct injection engine needs to increase a set of high-pressure oil pump driving device to increase the fuel injection pressure of the high-pressure oil pump from the original 4-5 bar to 200-350 bar.

[0003] The conventional high-pressure oil pump driving device is generally arranged above the cylinder head oil pool and is driven by a special cam on the camshaft to reciprocate the tappet barrel, so that the high-pressure oil pump obtains power and pressurizes the fuel to the required high pressure. How to obtain good and uniform lubrication, comprehensive cooling and heat dissipation, and surface self-cleaning of the tappet barrel friction pair is a difficulty in the design.

[0004] The arrangement mode of the conventional high-pressure oil pump can only adopt splash lubrication for lubrication because the tappet barrel friction pair is relatively far away from the cylinder head oil passage, and cannot form a long-term stable and uniform oil film, which will cause poor lubrication, untimely heat dissipation, poor self-cleaning and other defects, and often causes irregular abnormal knocking sound of the tappet barrel friction pair, which affects the NVH performance of the engine. SUMMARY

[0005] In view of this, the present application provides a high-pressure oil pump driving device and an engine to improve the lubrication effect of the tappet barrel.

[0006] Specifically, the technical scheme comprises the following:

[0007] In a first aspect, the present application provides a high-pressure oil pump driving device for driving a high-pressure oil pump, comprising a cylinder head and a tappet barrel, the cylinder head is provided with an oil passage and a mounting cavity, the oil passage is in communication with the mounting cavity, the tappet barrel is mounted in the mounting cavity and can move along the axial direction of the mounting cavity, the gap between the inner wall of the mounting cavity and the outer peripheral wall of the tappet barrel constitutes an oil supply part, the oil supply part is used for flowing oil, and the width of the oil supply part gradually increases from one side to the other side of the radial direction of the tappet barrel.

[0008] In the embodiment, the oil supply part is arranged on the tappet to provide a forced lubrication channel, so that the oil in the oil channel of the cylinder head can fully contact the tappet, which is conducive to forming a stable and effective oil film and improving the lubrication effect of the tappet; the width of the oil supply part gradually increases from one side to the other side in the radial direction of the tappet, which increases the accommodation space of the oil and provides a force relief and pressure relief space for the oil, prevents the tappet from being unevenly stressed due to relatively large oil pressure in some areas, improves the abnormal knocking of the tappet, and is conducive to improving the sound quality of the engine.

[0009] In an optional embodiment, in the orthographic projection of the high-pressure oil pump driving device along the axial direction of the tappet, the profile of the oil supply part is crescent-shaped.

[0010] In the embodiment, the orthographic projection profile of the oil supply part is crescent-shaped, which facilitates the machining of the mounting cavity of the cylinder head, and the inner wall surface of the mounting cavity is smooth and continuous, which helps to avoid stress concentration and reduce the resistance of the oil.

[0011] In an optional embodiment, in the orthographic projection of the high-pressure oil pump driving device along the axial direction of the tappet, the circumferential angle of the oil supply part is greater than or equal to 270°.

[0012] In the embodiment, the circumferential angle of the oil supply part is greater than or equal to 270°, so that the oil supply part covers at least three-quarters of the outer wall surface of the tappet, which fully ensures the contact area between the oil in the oil supply part and the outer wall surface of the tappet, and helps to form a sufficient and stable oil film.

[0013] In an optional embodiment, the ratio of the width of the oil supply part to the diameter of the tappet is 3% to 7%.

[0014] In the embodiment, the maximum width of the oil supply part is 3% to 7% of the diameter of the tappet, which improves the lubrication effect of the oil on the tappet while ensuring moderate flow and pressure of the oil, preventing the temperature of the oil from rising, increasing the resistance of the tappet, and affecting the sealing performance of the high-pressure oil pump driving device.

[0015] In an optional embodiment, the cylinder head is provided with an oil inlet hole, the oil channel is connected to the mounting cavity through the oil inlet hole, and the oil inlet hole is located at the maximum width of the oil supply part in the cylinder head.

[0016] In the embodiment, the oil inlet hole is arranged at the maximum width of the oil supply part in the cylinder head, so that the upstream area of the oil supply part corresponds to a larger flow space, which helps to balance the oil pressure upstream and downstream of the oil supply part and improve the uniformity of stress on the outer peripheral surface of the tappet.

[0017] In an optional embodiment, the maximum width of the oil supply part is smaller than the hole diameter of the oil inlet hole.

[0018] In this embodiment, by setting the maximum width of the oil supply part to be less than the hole diameter of the oil inlet hole, the pressure in the oil supply part is facilitated to be established, the oil is pumped from the upstream of the oil supply part to the downstream of the oil supply end, the residence time of the oil in the oil supply part is increased, the lubrication effect is enhanced, and the air is prevented from entering the oil supply part to avoid causing unstable movement of the tappet and noise.

[0019] In an alternative embodiment, the oil discharge hole is used to receive the oil flowing from the mounting cavity, and the extension line of the central axis of the oil discharge hole is parallel to the extension line of the central axis of the oil inlet hole.

[0020] In this embodiment, in the case where the extension direction of the oil inlet hole is inclined to the horizontal plane, by setting the extension line of the central axis of the oil discharge hole to be parallel to the extension line of the central axis of the oil inlet hole, the oil discharge effect of the oil discharge hole is ensured, and the oil amount flowing into the oil discharge hole per unit time is slightly reduced, the oil discharge rate of the oil discharge hole is less than the oil inlet rate of the oil inlet hole, and the residence time of the oil in the oil supply part is increased to provide sufficient and stable cooling and lubrication for the tappet.

[0021] In an alternative embodiment, the hole diameter of the oil discharge hole is less than the hole diameter of the oil inlet hole, and the hole diameter of the oil inlet hole is less than the diameter of the oil channel.

[0022] In this embodiment, by the above setting, the residence time of the oil in the mounting cavity is increased, and a stable and uniform oil film is provided to provide sufficient and stable cooling and lubrication for the tappet.

[0023] In an alternative embodiment, the outer peripheral wall of the tappet is provided with a limiting part extending in the axial direction of the tappet, the mounting cavity is recessed with a limiting groove matched with the limiting part, and the limiting part is movably embedded in the limiting groove.

[0024] In this embodiment, under the cooperation of the limiting part and the limiting groove, the tappet can only move in the axial direction and cannot rotate, and the cooperation of the limiting part and the limiting groove plays a role of preventing the tappet from rotating.

[0025] In the second aspect, the embodiments of the present application provide an engine comprising a high-pressure oil pump and a high-pressure oil pump driving device provided by any one of the embodiments of the first aspect, and the high-pressure oil pump driving device is used to drive the high-pressure oil pump.

[0026] The technical scheme provided by the embodiment of the application has at least the following beneficial effects: the gap between the inner wall of the mounting cavity and the outer peripheral wall of the tappet is used to form the oil supply part, so that the oil flows in the oil supply part to form an oil film on the outer peripheral wall of the tappet, thereby actively lubricating the tappet, improving the cooling and lubricating effect on the tappet, gradually increasing the width of the oil supply part from one side to the other side of the radial direction of the tappet, saving the space occupied by the oil supply part, and making the oil film formed on the outer peripheral wall of the tappet more stable, sufficient and uniform, improving the support area of the oil film, and improving the uneven stress problem of the outer peripheral wall of the tappet, which is helpful to improve the NVH sound quality problem of the high-pressure oil pump driving device. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0028] Figure 1 A partial schematic view of a high-pressure oil pump driving device provided by the embodiment of the application is shown in the figure.

[0029] Figure 2 A partial schematic view of a cylinder head of a high-pressure oil pump driving device provided by the embodiment of the application is shown in the figure.

[0030] Figure 3 A structural schematic view of a high-pressure oil pump driving device provided by the embodiment of the application is shown in the figure.

[0031] The reference signs in the figure respectively represent:

[0032] 1-cylinder head; 11-oil passage; 12-mounting cavity; 13-oil inlet hole; 14-oil outlet hole; 15-limiting groove; 16-first sealing plug; 17-second sealing plug; 2-tappet; 21-limiting part; 3-oil supply part; 31-first wall surface; 32-second wall surface; 4-driving cam; 5-camshaft; 6-pulley; 7-tappet rod; 8-high-pressure oil pump; 9-return spring.

[0033] The above drawings have shown the specific embodiments of the application, and more detailed description will be given hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the application by any means, but to illustrate the concept of the application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0034] With reference to the drawings and the embodiments described herein, it will be understood that the drawings are diagrammatic and are not drawn to scale, and that the embodiments are examples of the principles of the application and should not be construed as limiting the scope of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the application pertains. The materials used to practice the application are presently as described herein, but can be altered in various ways by one skilled in the art without departing from the spirit and scope of the application. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting since the scope of the application will be limited only by the appended claims.

[0035] It should be noted that when a component is referred to as being "on" another component, it can be directly on the other component or intervening components can also be present. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or intervening components can also be present.

[0036] In the present application, unless otherwise explicitly defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or communicated with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the application pertains. The terminology used in the specification of the present application is only for the purpose of describing specific embodiments and is not intended to limit the present application. The term "and / or" used in the present application includes any and all combinations of one or more related listed items.

[0038] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "vertical", "horizontal", "inner", "outer" and the like refer to the orientation or positional relationship described based on the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0039] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] Some embodiments of the present application will be described in detail with reference to the drawings. The following embodiments and features of the embodiments described below can be combined with each other in the case of no conflict.

[0041] As shown in Figures 1 to 3 , the embodiment of the present application provides a high-pressure oil pump driving device for driving a high-pressure oil pump 8, the high-pressure oil pump driving device comprising a cylinder head 1 and a tappet 2, the cylinder head 1 being provided with an oil channel 11 and a mounting cavity 12, the oil channel 11 being in communication with the mounting cavity 12, the tappet 2 being mounted in the mounting cavity 12 and being capable of moving along the axial direction of the mounting cavity 12, the gap between the inner wall of the mounting cavity 12 and the outer peripheral wall of the tappet 2 constituting an oil supply part 3, the oil supply part 3 being used for the flow of oil, the width of the oil supply part 3 gradually increasing from one side to the other side in the radial direction of the tappet 2.

[0042] It can be understood that the axial direction of the mounting cavity 12 is parallel to the axial direction of the tappet 2.

[0043] Specifically, the high-pressure oil pump driving device further comprises a camshaft 5, a roller 6 and a tappet rod 7.

[0044] The camshaft 5 is fixedly provided with a driving cam 4, the driving cam 4 being provided with one or more protrusions. Exemplarily, Figure 3 for a schematic view formed by cutting along the direction perpendicular to the length direction of the camshaft 5, please refer to Figure 3 , the driving cam 4 is coaxially arranged with the camshaft 5 and can rotate with the camshaft 5, the cross-sectional profile of the driving cam 4 is a rounded rectangle, the driving cam 4 has four protrusions, and the driving cam 4 can push the tappet 2 to reciprocate four times in one rotation.

[0045] The roller 6 is mounted on the tappet 2 and abuts against the driving cam 4, one end of the tappet rod 7 is connected with the tappet 2, and the other end is connected with the high-pressure oil pump 8. A return spring 9 is further arranged between the tappet 2 and the high-pressure oil pump 8, for realizing the reset and reciprocation of the tappet 2. The length direction of the tappet rod 7 is parallel to the axial direction of the mounting cavity 12, so that the tappet 2 and the tappet rod 7 move in the same direction.

[0046] Optionally, the central axis of the roller 6 is parallel to the central axis of the camshaft 5, the roller 6 can rotate around its own central axis, realize the rolling contact with the driving cam 4, reduce the friction between the roller 6 and the driving cam 4, and reduce the resistance when the tappet 2 moves.

[0047] Exemplarily, the working process of the high-pressure oil pump driving device is as follows:

[0048] The camshaft 5 rotates around its own central axis, driving the driving cam 4 to rotate;

[0049] As the drive cam 4 rotates and the roller 6 gradually approaches the protrusion, the drive cam 4 pushes the roller 6 and the tappet 2 to move along the axial direction of the mounting cavity 12 and gradually approach the high-pressure oil pump 8. At the same time, it drives the tappet 7 to move towards the side closer to the high-pressure oil pump 8, thereby driving the high-pressure oil pump 8 to pressurize the fuel supply system. During this process, the return spring 9 is compressed.

[0050] As the drive cam 4 rotates and the roller 6 gradually moves away from the protrusion, the return spring 9 generates a restoring force, pushing the roller 6, tappet 2, and tappet 7 to move away from the high-pressure oil pump 8, thereby resetting the tappet 2 and completing one reciprocating motion of the tappet 2, ensuring that the roller 6 is always in contact with the drive cam 4.

[0051] In the high-pressure drive device provided in this application embodiment, the oil passage 11 of the cylinder head 1 is used to deliver lubricating oil to the mounting cavity 12 to lubricate the tappet 2 in the mounting cavity 12. At the same time, the flowing oil reduces the temperature of the tappet 2, thereby achieving cooling and heat dissipation during the movement of the tappet 2.

[0052] A gap exists between the inner wall of the mounting cavity 12 and the outer peripheral wall of the tappet 2, forming an oil supply section 3. The oil supply section 3 provides an oil flow channel for the mounting cavity 12, allowing the oil to fully contact the tappet 2. The oil supply section 3 is distributed around the outer peripheral side of the tappet 2 to improve the circumferential lubrication effect of the tappet 2.

[0053] In existing technology, oil holes are usually opened on the cylinder head 1. The splashed oil comes into contact with the surface of the tappet 2 through the oil holes, making it difficult to form a stable and uniform oil film. This makes it difficult to provide sufficient cooling and lubrication for the tappet 2, which can easily lead to problems such as poor lubrication, untimely heat dissipation, and poor self-cleaning effect. This causes irregular and abnormal knocking sounds, which affect the NVH (Noise, Vibration, Harshness) sound quality of the engine.

[0054] In the high-pressure oil pump drive device provided in the embodiments of this application, the oil supply part 3 is configured to provide a forced lubrication channel for the tappet 2, so that the oil in the oil passage 11 of the cylinder head 1 can make sufficient contact with the tappet 2, which is conducive to forming a stable and effective oil film and improving the lubrication effect of the tappet 2.

[0055] In actual engine use, to save space, the high-pressure oil pump drive unit is usually arranged at an angle to the horizontal plane, for example... Figure 3 As shown, both the length direction of the high-pressure oil pump drive device and the length direction of the high-pressure oil pump 8 are inclined to the horizontal direction. Due to this configuration, the tappet in the prior art is prone to uneven stress on its outer peripheral wall, uneven oil film distribution on the tappet surface, and asymmetrical frictional force of the tappet.

[0056] In the high-pressure oil pump driving device provided in the embodiment of the present application, the width of the oil supply part 3 gradually increases from one side to the other side in the radial direction of the tappet barrel 2, the accommodation space of the oil is increased, the force relief and pressure relief space is provided for the oil, the uneven force on the tappet barrel 2 caused by the large oil pressure in some areas is prevented, the abnormal knocking of the tappet barrel 2 is improved, and the sound quality of the engine is improved.

[0057] It can be understood that, as shown in Figure 1 the region surrounded by the inner wall of the mounting cavity 12 and defined as the oil supply part 3 is defined as the first wall surface 31, and the region surrounded by the outer wall surface of the tappet barrel 2 and defined as the oil supply part 3 is defined as the second wall surface 32, the width of the oil supply part 3 is the distance between the first wall surface 31 and the second wall surface 32 in the radial direction of the tappet barrel 2 in the sectional view obtained by cutting the high-pressure oil pump driving device with a plane perpendicular to the central axis of the tappet barrel 2.

[0058] Exemplarily, the sectional view obtained by cutting the region where the mounting cavity 12 is located in the high-pressure oil pump driving device at any position in the axial direction of the tappet barrel 2 with a plane perpendicular to the central axis of the tappet barrel 2 is the same.

[0059] The high-pressure oil pump driving device provided in the embodiment of the present application forms the oil supply part 3 by setting the gap between the inner wall of the mounting cavity 12 and the outer peripheral wall of the tappet barrel 2, and makes the oil flow in the oil supply part 3 to form an oil film on the outer peripheral wall of the tappet barrel 2 to actively lubricate the tappet barrel 2, thereby improving the cooling and lubrication effect on the tappet barrel 2; the width of the oil supply part 3 gradually increases from one side to the other side in the radial direction of the tappet barrel 2, which saves the space occupied by the oil supply part 3 while making the oil film formed on the outer peripheral wall of the tappet barrel 2 more stable, sufficient and uniform, thereby improving the support area of the oil film and improving the uneven force on the outer peripheral wall of the tappet barrel 2, which helps to improve the NVH sound quality problem of the high-pressure oil pump driving device.

[0060] In the orthographic projection of the high-pressure oil pump driving device in the axial direction of the tappet barrel 2, the inner contour line of the mounting cavity 12 can be an ellipse, a rhombus, a triangle or other irregular shapes, which can achieve the gradual increase of the width of the oil supply part 3 from one side to the other side in the radial direction of the tappet barrel 2.

[0061] In an optional embodiment, in the orthographic projection of the high-pressure oil pump driving device in the axial direction of the tappet barrel 2, the contour line of the oil supply part 3 is crescent-shaped.

[0062] Figure 1 and Figure 2 It is shown that the sectional view obtained by cutting the high-pressure oil pump driving device with a plane perpendicular to the central axis of the tappet barrel 2 is the same as the orthographic projection of the high-pressure oil pump driving device in the axial direction of the tappet barrel 2, as shown in Figure 1As shown, the profile lines of the first wall surface 31 and the second wall surface 32 are both arc-shaped, and the profile line of the oil supply part 3 formed by the first wall surface 31 and the second wall surface 32 is crescent-shaped. The width of the oil supply part 3 gradually increases along the direction from bottom to top, and reaches the maximum at the highest position.

[0063] Specifically, the orthographic projection profile line of the mounting cavity 12 is elliptical, or the orthographic projection profile line of the mounting cavity 12 is circular and has a diameter greater than that of the tappet 2, so that the inner wall surface of the mounting cavity 12 and the outer wall surface of the tappet 2 form a crescent-shaped oil supply part 3 with narrow ends and a wide middle part in the orthographic projection profile line.

[0064] In this embodiment, by setting the orthographic projection profile line of the oil supply part 3 to be crescent-shaped, the machining of the mounting cavity 12 of the cylinder head 1 is facilitated, and the inner wall surface of the mounting cavity 12 is smooth and continuous, which helps to avoid stress concentration and reduce the resistance of the oil.

[0065] In a further embodiment, in the orthographic projection of the high-pressure oil pump driving device along the axial direction of the tappet 2, the circumferential angle of the oil supply part 3 is greater than or equal to 270°.

[0066] It can be understood that, in the orthographic projection of the high-pressure oil pump driving device along the axial direction of the tappet 2, the circumferential angle of the oil supply part 3 is the angle of the circumferential angle corresponding to the second wall surface 32.

[0067] Exemplarily, the circumferential angle of the oil supply part 3 can be 270°, 290°, 300°, 360°, etc., and can be set according to actual needs.

[0068] By setting the circumferential angle of the oil supply part 3 to be greater than or equal to 270°, the oil supply part 3 covers at least three-quarters of the outer wall surface of the tappet 2, sufficiently ensuring the contact area of the oil in the oil supply part 3 with the outer wall surface of the tappet 2, and helping to form a sufficient and stable oil film.

[0069] In a specific embodiment, the maximum width of the oil supply part 3 is 3% to 7% of the diameter of the tappet 2.

[0070] Exemplarily, the maximum width of the oil supply part 3 can be 3%, 4%, 6%, 7%, etc. of the diameter of the tappet 2, and can be set according to actual needs.

[0071] Exemplarily, the diameter of the tappet 2 is 50 mm, and the maximum width of the oil supply part 3 is 1.5 mm, which is 3% of the diameter of the tappet 2.

[0072] Exemplarily, if the maximum width of the oil supply part 3 is less than 3% (not including 3%) of the diameter of the tappet 2, it is difficult to form a stable and sufficient oil film, which may cause uneven cooling and lubrication effects on different parts of the tappet 2, and may cause problems such as poor lubrication, delayed heat dissipation, and poor self-cleaning.

[0073] Exemplarily, if the maximum width of the oil supply part 3 is more than 7% (not including 7%) of the diameter of the tappet 2, it is easy to cause excessive oil, increase the friction resistance of the tappet 2, affect the cooling and heat dissipation effect of the tappet 2, cause energy loss and efficiency decline; it is also possible to form oil bubbles, affect the flow and lubrication effect of the oil in the oil supply part 3, increase the oil pressure, cause the loosening of the sealing element in the cylinder head 1, affect the sealing of the high-pressure oil pump driving device; it is also possible to carry more impurities such as sediments and dust, block the oil supply part 3, affect the flow and lubrication effect of the oil, cause oil pollution.

[0074] In this embodiment, by setting the maximum width of the oil supply part 3 to be 3% to 7% of the diameter of the tappet 2, the lubrication effect of the oil on the tappet 2 is improved, and the flow and pressure of the oil are moderate, preventing the oil temperature from rising, increasing the resistance of the tappet 2, and affecting the sealing of the high-pressure oil pump driving device.

[0075] In a further embodiment, the cylinder head 1 is provided with an oil inlet hole 13, and the oil gallery 11 is connected with the mounting cavity 12 through the oil inlet hole 13. The oil inlet hole 13 is located at the maximum width of the oil supply part 3 in the cylinder head 1.

[0076] As shown in Figure 2 , the oil gallery 11 of the cylinder head 1 extends along a first direction, and the oil inlet hole 13 extends along a second direction. The first direction is perpendicular to the second direction. A first sealing plug 16 is installed at the downstream end of the oil gallery 11, and a second sealing plug 17 is installed at the end of the oil inlet hole 13 away from the oil outlet. The first sealing plug 16 and the second sealing plug 17 play the role of plugging the flow channel.

[0077] The oil in the oil gallery 11 enters the oil inlet hole 13, flows into the mounting cavity 12 from the oil inlet hole 13, and flows along the oil supply part 3 to achieve cooling and lubrication of the tappet 2.

[0078] Since in the oil supply part 3, the upstream region has a relatively larger oil flow rate or oil pressure compared to the downstream region, by setting the oil inlet hole 13 at the maximum width of the oil supply part 3 in the cylinder head 1, the upstream region of the oil supply part 3 corresponds to a larger flow space, which helps to balance the oil pressure of the upstream and downstream of the oil supply part 3, and improve the uniformity of the stress on the outer circumferential surface of the tappet 2.

[0079] In a further embodiment, the maximum width of the oil supply part 3 is smaller than the hole diameter of the oil inlet hole 13.

[0080] Specifically, the maximum width of the oil supply part 3 is located at the downstream end of the oil inlet hole 13 and at the upstream end of the oil supply part 3. By setting the maximum width of the oil supply part 3 to be smaller than the hole diameter of the oil inlet hole 13, the pressure in the oil supply part 3 is facilitated to be established, the oil is pumped from the upstream of the oil supply part 3 to the downstream of the oil supply end, the residence time of the oil in the oil supply part 3 is increased, the lubrication effect is enhanced, and the air is prevented from entering the oil supply part 3 to avoid causing the unstable movement and noise of the tappet 2.

[0081] In a further embodiment, the cylinder head 1 is provided with an oil discharge hole 14 for receiving the oil flowing out of the mounting cavity 12, and the extension line of the central axis of the oil discharge hole 14 is parallel to the extension line of the central axis of the oil inlet hole 13.

[0082] In the normal working state of the high-pressure oil pump driving device, the central axes of the oil inlet hole 13 and the oil discharge hole 14 are both inclined to the horizontal direction, the tappet 2 and the oil discharge hole 14 are both located below the oil inlet hole 13 in the vertical direction, for example Figure 3 As shown, the oil discharge hole 14 is located below the oil inlet hole 13. The oil in the oil supply part 3 flows down from the surface of the tappet 2 under the action of gravity and flows into the oil discharge hole 14.

[0083] Optionally, the high-pressure oil pump driving device is provided with an oil pool located below the oil discharge hole 14, and the oil flowing out of the oil discharge hole 14 is transported to the oil pool to be sucked by the power element such as the driven pump for the next oil circulation.

[0084] In the case where the extension direction of the oil inlet hole 13 is inclined to the horizontal plane, by setting the extension line of the central axis of the oil discharge hole 14 to be parallel to the extension line of the central axis of the oil inlet hole 13, the oil discharge efficiency of the oil discharge hole 14 is ensured, and the oil amount flowing into the oil discharge hole 14 per unit time is slightly reduced, so that the oil discharge rate of the oil discharge hole 14 is smaller than the oil inlet rate of the oil inlet hole 13, thereby increasing the residence time of the oil in the oil supply part 3 to provide sufficient and stable cooling and lubrication for the tappet 2.

[0085] In a further embodiment, the hole diameter of the oil discharge hole 14 is smaller than the hole diameter of the oil inlet hole 13, and the hole diameter of the oil inlet hole 13 is smaller than the diameter of the oil gallery 11.

[0086] Specifically, the oil discharge hole 14 is located downstream of the oil inlet hole 13, and the oil inlet hole 13 is located downstream of the oil gallery 11. By the above setting, the residence time of the oil in the mounting cavity 12 is increased, and a stable and uniform oil film is provided to provide sufficient and stable cooling and lubrication for the tappet 2.

[0087] In an optional embodiment, the outer peripheral wall of the tappet 2 is provided with a limiting part 21 extending in the axial direction of the tappet 2, the mounting cavity 12 is concavely provided with a limiting groove 15 matched with the limiting part 21, and the limiting part 21 is movably embedded in the limiting groove 15.

[0088] As shown in Figure 1 The size and shape of the limiting groove 15 are matched with the size and shape of the limiting portion 21, and under the cooperation of the limiting portion 21 and the limiting groove 15, the tumbler 2 can only move along the axial direction of itself and cannot rotate, and the cooperation of the limiting portion 21 and the limiting groove 15 plays a role of preventing the tumbler 2 from rotating.

[0089] It can be understood that the above-mentioned size matching means that the size of the limiting groove 15 is slightly larger than the size of the limiting portion 21, so that the limiting portion 21 can move linearly along the limiting groove 15; and the above-mentioned shape matching means that the shape of the limiting groove 15 is slightly larger than the size of the limiting portion 21.

[0090] The embodiment of the present application also provides an engine comprising the high-pressure oil pump driving device provided by any of the above-mentioned embodiments, and the high-pressure oil pump driving device is used to drive the high-pressure oil pump 8, provide power for the high-pressure oil pump 8, and thus pressurize the fuel to a required high-pressure.

[0091] In the description of the present specification, the description of the terms "embodiment", "specific embodiment", "example" or "specific example" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above-mentioned terms does not necessarily refer to the same embodiment or example.

[0092] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. The present application is intended to cover any variations, uses or adaptive changes of this application following the general principles thereof and including those expressly stated or implied herein. The specification and examples are to be regarded as exemplary only.

[0093] It should be understood that the present application is not limited to the precise construction that has been described and shown in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the present application is only limited by the appended claims.

Claims

1. A high-pressure oil pump drive device for driving a high-pressure oil pump (8), characterized by, The high-pressure oil pump driving device comprises a cylinder cover (1) and a tappet barrel (2), the cylinder cover (1) is provided with an oil channel (11) and a mounting cavity (12), the oil channel (11) is communicated with the mounting cavity (12), the tappet barrel (2) is mounted in the mounting cavity (12) and can move along the axial direction of the mounting cavity (12), the gap between the inner wall of the mounting cavity (12) and the outer peripheral wall of the tappet barrel (2) forms an oil supply part (3), the oil supply part (3) is used for flowing oil, the width of the oil supply part (3) gradually increases from bottom to top, and the inner contour line of the mounting cavity (12) is in an elliptical shape, wherein the region of the inner wall in the mounting cavity (12) which surrounds the oil supply part (3) is defined as a first wall surface (31), the region of the outer wall surface of the tappet barrel (2) which surrounds the oil supply part (3) is defined as a second wall surface (32), and the width of the oil supply part (3) is the distance between the first wall surface (31) and the second wall surface (32) along the radial direction of the tappet barrel (2) in the sectional view obtained by cutting the high-pressure oil pump driving device with a plane perpendicular to the central axis of the tappet barrel (2).

2. The high-pressure oil pump drive device according to claim 1, characterized by In the orthographic projection of the high-pressure oil pump driving device along the axial direction of the tappet barrel (2), the contour line of the oil supply part (3) is in a crescent shape.

3. The high-pressure oil pump drive apparatus according to claim 2, characterized by In the orthographic projection of the high-pressure oil pump driving device along the axial direction of the tappet barrel (2), the circumferential angle of the oil supply part (3) is greater than or equal to 270°.

4. The high-pressure oil pump drive device according to claim 2, characterized by The maximum width of the oil supply part (3) is 3% to 7% of the diameter of the tappet barrel (2).

5. The high-pressure oil pump drive apparatus according to claim 2, characterized by The cylinder cover (1) is provided with an oil inlet hole (13), the oil channel (11) is communicated with the mounting cavity (12) through the oil inlet hole (13), and the oil inlet hole (13) is located at the maximum width of the oil supply part (3) in the cylinder cover (1).

6. The high-pressure oil pump drive device according to claim 5, characterized by The maximum width of the oil supply part (3) is less than the hole diameter of the oil inlet hole (13).

7. The high-pressure oil pump drive apparatus according to claim 5, characterized by The cylinder cover (1) is provided with an oil outlet hole (14), the oil outlet hole (14) is used for receiving the oil flowing out of the mounting cavity (12), and the extension line of the central axis of the oil outlet hole (14) is parallel to the extension line of the central axis of the oil inlet hole (13).

8. The high-pressure oil pump drive apparatus according to claim 7, characterized by The hole diameter of the oil outlet hole (14) is less than the hole diameter of the oil inlet hole (13), and the hole diameter of the oil inlet hole (13) is less than the diameter of the oil channel (11).

9. The high-pressure oil pump drive apparatus according to claim 1, characterized by The outer peripheral wall of the tappet barrel (2) is provided with a limiting part (21) extending along the axial direction of the tappet barrel (2), the mounting cavity (12) is concavely provided with a limiting groove (15) matched with the limiting part (21), and the limiting part (21) is movably embedded in the limiting groove (15).

10. An engine characterized by, The high-pressure oil pump driving device according to any one of claims 1 to 9 is used for driving a high-pressure oil pump (8).

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