Camshaft rotation adjusting device
By combining the connector of the camshaft rotation adjustment device with the phase adjustment structure, the problem of inaccurate camshaft position adjustment is solved, enabling convenient camshaft rotation and high-pressure oil pump installation, and improving the engine's structural compactness and maintenance efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING CHEHEJIA AUTOMOBILE TECH CO LTD
- Filing Date
- 2025-05-30
- Publication Date
- 2026-06-23
AI Technical Summary
During engine overhaul, it is difficult to accurately adjust the position of the oil pump cam on the camshaft to the zero-lift position, resulting in unstable installation or false torque. Furthermore, existing technology requires a large rotational operating space, which affects the layout and compact design of engine parts.
The camshaft rotation adjustment device is adopted, which is detachably connected to the phase adjustment structure through the connector. The rotation drive component drives the camshaft to rotate, reducing the need for modification of the engine cover, providing ample operating space, and realizing convenient adjustment of the camshaft.
The camshaft rotation operation is simplified, ensuring that the oil pump cam is accurately aligned with the zero-lift position, facilitating the installation of the high-pressure oil pump, reducing the space requirements and parts costs of the engine, and improving the overall structural compactness.
Smart Images
Figure CN224391045U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of engine maintenance technology, and in particular to a camshaft rotation adjustment device. Background Technology
[0002] During engine shutdown, the camshaft will be in a random position after stopping rotation. When the high-pressure oil pump needs to be repaired, before reinstalling the high-pressure oil pump and tightening its bolts, the oil pump cam on the camshaft must be in the zero-lift position to prevent the oil pump cam from compressing the plunger spring of the high-pressure oil pump, which could lead to unstable installation or false torque. False torque refers to the situation where, during bolt tightening, certain influencing factors prevent the tightening torque applied to the bolt from being fully converted into clamping force, resulting in a clamping force lower than the theoretical value. Therefore, during repair, the camshaft needs to be manually rotated and its oil pump cam position observed, and rotated to the zero-lift base circle position.
[0003] In related technologies, to meet the requirements of rotating the camshaft, two or six clamping points are usually designed around the camshaft circumference. The camshaft is rotated after being clamped by a clamping tool. At the same time, a large tooling window needs to be reserved on the camshaft cover above the camshaft. The clamping tool needs to be inserted through the tooling window and rotated at the tooling window to drive the camshaft to rotate. The clamping tool requires a large rotation space, and the tooling window area is large. The design of the clamping tool and the tooling window on the cover also places high demands on the space for the arrangement of parts on the engine, which is not conducive to the compact design of parts. Utility Model Content
[0004] The purpose of this utility model is to provide a camshaft rotation adjustment device to solve the problem in the related technology where a tooling window is opened on the camshaft cover, and a clamping tool is inserted into the tooling window to clamp the camshaft circumferentially to drive the camshaft to rotate, which requires a large rotation operation space.
[0005] To achieve this objective, the present invention adopts the following technical solution:
[0006] This utility model provides a camshaft rotation adjustment device, which includes:
[0007] A connector having a camshaft axial connection structure, wherein the camshaft axial connection structure is detachably connected to the phase adjustment structure;
[0008] A rotation drive component, wherein the rotation drive component is connected to the connector head in a transmission manner;
[0009] When the camshaft rotation adjustment device rotates to adjust the camshaft, the rotation drive drives the connector to rotate, and the connector drives the camshaft to rotate through the camshaft axial connection structure and the phase adjustment structure in the connected state.
[0010] In one embodiment, the camshaft axial connection structure includes a first connecting hole, and the phase adjustment structure has a first fixing pin. When the camshaft rotation adjustment device rotates to adjust the camshaft, the connector is inserted into the first fixing pin through the first connecting hole, and the connector drives the first fixing pin to rotate around the axis of the camshaft; and / or,
[0011] The camshaft axial connection structure includes a second fixing pin, and the phase adjustment structure has a second connecting hole. When the camshaft rotation adjustment device rotates to adjust the camshaft, the phase adjustment structure is inserted into the second fixing pin through the second connecting hole, and the connector drives the second fixing pin to rotate around the axis of the camshaft.
[0012] In one embodiment, the first connecting hole is provided in one or more sets, with each pair of first connecting holes forming a set. In each set, one of the two first connecting holes is a plug hole, and the other is an elongated hole. The length extension direction of the elongated hole intersects the axis of the camshaft. The plug hole is correspondingly configured with a first fixing pin, and the plug hole is inserted into the correspondingly configured first fixing pin. The elongated hole is correspondingly configured with a first fixing pin, and the elongated hole is inserted into the correspondingly configured first fixing pin, and the first fixing pin can be inserted into different length positions of the elongated hole.
[0013] In one embodiment, when there is one camshaft axial connection structure, the camshaft axial connection structure has a first rotation limiting surface in the circumferential direction, and the phase adjustment structure has a second rotation limiting surface in the circumferential direction. When the camshaft axial connection structure is inserted into the phase adjustment structure, the first rotation limiting surface and the second rotation limiting surface fit and abut against each other. Alternatively, there are multiple camshaft axial connection structures, and the multiple camshaft axial connection structures are spaced apart on the connector head and are all inserted into the phase adjustment structure.
[0014] In one embodiment, the camshaft axial connection structure is provided in multiple sets, with each set consisting of two camshaft axial connection structures. The cross-sectional dimensions of the camshaft axial connection structures in different sets are different, and / or the shapes of the camshaft axial connection structures in different sets are different, and / or the spacing of the camshaft axial connection structures in different sets is different.
[0015] In one embodiment, the connector is a ring-shaped structure with a weight-reducing hole in the middle. The camshaft axial connection structure extends along the axial direction of the ring-shaped structure and is located on the outer periphery of the weight-reducing hole.
[0016] In one embodiment, the rotation drive includes a transition rod and a gripping rod connected together. The transition rod is connected to the connector and is arranged axially along the camshaft. The extension direction of the gripping rod intersects the extension direction of the transition rod.
[0017] In one embodiment, the rotation drive further includes a torsion-fixed structure, the transition rod is disposed at the center of the connector, and the gripping rod is rotatably connected to the transition rod through the torsion-fixed structure.
[0018] In one embodiment, the torque range of the constant torque structure is less than or equal to 0.4 N·m.
[0019] In one embodiment, the connector is integrally formed with the rotation drive component, or the connector is detachably connected to the rotation drive component.
[0020] The beneficial effects of this utility model are as follows:
[0021] This utility model provides a camshaft rotation adjustment device. The connector of the camshaft rotation adjustment device can be connected to the phase adjustment structure at the end of the camshaft through the camshaft axial connection structure. The rotation drive drives the connector to rotate, so that the connector can drive the camshaft to rotate around its own axis through the camshaft axial connection structure and the phase adjustment structure in the connected state. The rotation drive can be located outside the engine housing and connected to the phase adjustment structure through the connector. The rotation drive has sufficient operating space. During engine shutdown and repair, when the high-pressure oil pump is reinstalled, the rotation drive can easily push the camshaft to rotate through the connector, so that the oil pump cam on the camshaft can rotate to the zero-lift base circle position, so that the zero-lift base circle position is aligned with the installation position of the high-pressure oil pump, so that the high-pressure oil pump can be installed smoothly. This reduces the size requirement of opening a large tooling window on the cover above the camshaft, which is conducive to the compact design of the engine top parts and saves parts costs. The rotary drive component is installed in conjunction with the phase adjustment structure via a connector, allowing it to operate within ample space. This reduces the need for excessive modifications to the engine camshaft cover and the design requirements for avoiding obstructions to other circumferential components within the engine camshaft, thus improving the overall structural compactness of the engine components. Once the high-pressure oil pump is installed, the camshaft axial connection structure and phase adjustment structure of the connector are disassembled, and the external drive device can be reinstalled and fitted onto the camshaft. The maintenance process is simple and convenient, minimizing the disassembly and reassembly of numerous external parts. Attached Figure Description
[0022] Figure 1 This is a schematic diagram showing the positional relationship between the camshaft rotation adjustment device and the camshaft in an embodiment of this utility model;
[0023] Figure 2 This is a schematic diagram of the camshaft rotation adjustment device in an embodiment of the present invention;
[0024] Figure 3 This is a schematic diagram showing the positional relationship between the camshaft and the external drive device in an embodiment of this utility model.
[0025] In the picture:
[0026] 1. Connector; 11. Camshaft axial connection structure; 12. Weight reduction hole;
[0027] 2. Rotation drive component; 21. Transition rod; 22. Holding rod;
[0028] 3. Camshaft; 31. Oil pump cam; 311. Base circle wall;
[0029] 4. Phase adjustment structure; 41. First fixing pin; 42. Phase adjuster; 421. Sprocket;
[0030] 5. High-pressure oil pump; 51. Oil pump tappet;
[0031] 6. External drive device. Detailed Implementation
[0032] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.
[0033] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0035] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0036] like Figures 1 to 3As shown, an embodiment of this utility model provides a camshaft rotation adjustment device, which includes a connector 1 and a rotation drive 2. A phase adjustment structure 4 is provided at the end of the camshaft 3. The connector 1 has a camshaft axial connection structure 11, which is detachably connected to the phase adjustment structure 4. The rotation drive 2 is drively connected to the connector 1. When the camshaft rotation adjustment device rotates to adjust the camshaft 3, the rotation drive 2 can drive the connector 1 to rotate. The connector 1 drives the camshaft 3 to rotate through the camshaft axial connection structure 11 and the phase adjustment structure 4 in the connected state. That is, when the camshaft axial connection structure 11 and the phase adjustment structure 4 are connected, the rotation drive 2 can drive the connector 1 to rotate, and the connector 1 can drive the camshaft 3 to rotate through the camshaft axial connection structure 11 and the phase adjustment structure 4.
[0037] The provision of a phase adjustment structure 4 at the end of the camshaft 3 refers to the presence of a phase adjustment structure 4 at the end of the camshaft 3 that is compatible with the camshaft rotation adjustment device for connection by the connector 1. The phase adjustment structure 4 can be mounted on the camshaft 3 body or on other structures at the end of the camshaft 3, as long as it can drive the camshaft 3 to rotate as a whole. The phase adjustment structure 4 may include, but is not limited to, one or more of the following: a phase adjuster 42, a pin, and a connecting hole.
[0038] For example, the phase adjustment structure 4 can be selected as a phase adjuster 42. The phase adjuster 42 is a device used to adjust the phase relationship between the camshaft 3 and the engine crankshaft, and is one of the core components of the engine's variable valve timing system. The phase adjuster 42 has a power input structure and a power output structure with transmission connection. The connector 1 is transmissionally connected to the power input structure through the camshaft axial connection structure 11, and the power output structure is transmissionally connected to the camshaft 3. The rotating drive component 2 drives the connector 1 to rotate, which in turn drives the camshaft 3 to rotate through the phase adjuster 42. The power input structure and the power output structure refer to two transmission structures on the phase adjuster 42. The power input structure can be transmissionally connected to the external drive device 6 or the connector 1 as the power input of the phase adjuster 42, and the power output structure can be transmissionally connected to the camshaft 3 as the power output of the phase adjuster 42. The structure of the power input structure and the power output structure can also be different depending on the type of phase adjuster 42. For example, the phase adjuster 42 can be, but is not limited to, an electric phase adjuster 42 or a hydraulic phase adjuster 42. The phase adjuster 42 is located at the end of the camshaft 3 and is connected to the crankshaft of the engine. Specifically, the phase adjuster 42 can be fixedly connected to the sprocket 421 as a whole. For example, the sprocket 421 can be connected to the power input structure, and the crankshaft can drive the sprocket 421 to rotate via the timing chain. External drive devices 6, such as the phase adjustment motor at the front of the engine, can be detached from the phase adjuster 42. The phase adjuster 42 is exposed to the operator's field of vision, and there is ample operating space at the phase adjuster 42.
[0039] It should be noted that the external drive device 6 can be, but is not limited to, a phase adjustment motor. In the engine structure, external drive devices 6 such as phase adjustment motors are usually installed on the engine housing and exposed in the external space of the engine housing. The phase adjuster 42 can be detachably connected to the external drive device 6. By detaching the external drive device 6 from the phase adjuster 42, the phase adjuster 42 can be exposed to the operator's field of vision. The rotating drive component 2 is connected to the phase adjuster 42 through the connector 1, which can drive the camshaft 3 to rotate, thereby adjusting the base circle position of the oil pump cam 31.
[0040] If the phase adjustment structure 4 is a fixed pin or connecting hole set on the body of the camshaft 3, a small hole can be directly opened on the engine housing for the connector 1 to pass through. The connector 1 passes through the engine housing and connects to the phase adjustment structure 4, which can also smoothly drive the camshaft 3 to rotate. Moreover, the rotation drive component 2 is located outside the engine housing, with sufficient rotation operation space. Compared with the tooling window set in the circumference of the camshaft 3 in related technologies, the area of the small hole for the connector 1 to pass through is much smaller than the area of the tooling window, reducing the space required for the arrangement of parts on the engine.
[0041] The camshaft axial connection structure 11 refers to a structure that can be provided at least in the axial direction of the camshaft 3 and can be detachably connected to the phase adjustment structure 4 so that torque can be transmitted in the circumferential direction of the camshaft 3 after the camshaft axial connection structure 11 is connected to the phase adjustment structure 4. The detachable connection method between the camshaft axial connection structure 11 and the phase adjustment structure 4 may include, but is not limited to, one or more of the following: plug-in, snap-fit, bolt connection, and magnetic connection.
[0042] Rotary drive component 2 refers to a structure that can drive the power input structure to rotate through connector 1 when the engine is stopped. Rotary drive component 2 may be, but is not limited to, a rotary cylinder, a rotary hydraulic cylinder, or a wrench-type manual drive component.
[0043] With this setup, after the engine is shut down, the high-pressure oil pump 5 can be removed. The connector 1 can be connected to the phase adjustment structure 4 at the end of the camshaft 3 via the camshaft axial connection structure 11. The rotating drive 2 drives the connector 1 to rotate, which in turn drives the camshaft 3 to rotate around its own axis through the camshaft axial connection structure 11 and the phase adjustment structure 4 in the connected state. The rotating drive 2 can be located outside the engine housing and connected to the phase adjustment structure 4 via the connector 1. The rotating drive 2 has sufficient operating space. During engine shutdown and repair, when the high-pressure oil pump 5 is reinstalled, the rotating drive 2 can easily push the camshaft 3 to rotate via the connector 1, so that the oil pump cam 31 on the camshaft 3 can rotate to the zero-lift base circle position, aligning the zero-lift base circle position with the installation position of the high-pressure oil pump 5, allowing the high-pressure oil pump 5 to be installed smoothly. This reduces the size requirement of opening a large tooling window on the cover above the camshaft 3, facilitating the compact design of the engine top components and saving parts costs. The rotary drive component 2 is installed in conjunction with the phase adjustment structure 4 via the connector 1, allowing it to operate within sufficient space. This reduces the need for excessive modifications to the cover above the engine camshaft 3 and the design requirements for avoiding other circumferential components of the camshaft 3 within the engine, thus improving the overall structural compactness of the engine components to some extent. After the high-pressure oil pump 5 is installed, the camshaft axial connection structure 11 of the connector 1 is disassembled from the phase adjustment structure 4, and the external drive device 6 is reinstalled and fitted to the camshaft 3. The maintenance process is simple and convenient, reducing the disassembly and assembly of too many external parts. This solves the problem of large operating space requirements in related technologies where a tooling window is opened on the camshaft 3 cover, and a clamping tool is inserted into the tooling window to clamp the camshaft 3 circumferentially to drive its rotation.
[0044] It should be noted that the inventors attempted to indirectly drive the camshaft 3 by rotating the crankshaft. However, for engines with built-in TVD (Torsion Vibration Damper), rotating the crankshaft requires opening the engine cover first, an operation that cannot be performed on the vehicle itself, necessitating the removal of the engine from the vehicle—a cumbersome and time-consuming process. This embodiment exposes the phase adjustment structure 4 by removing the external drive unit 6 or by creating a small opening in the engine housing for the connector 1 to pass through. Rotating the drive component 2 drives the connector 1 to rotate, which in turn drives the camshaft 3 to rotate through the camshaft axial connection structure 11 and the phase adjustment structure 4. This reduces the overall disassembly and reassembly of the engine and is applicable to various engine types. In this embodiment, the phase adjustment motor can be fixedly connected to the engine housing or phase adjuster 42 using only three bolts. Disassembly and reassembly of the phase adjustment motor only requires removing and installing these three bolts, making the process convenient.
[0045] In some other embodiments, the phase adjustment structure 4 can be a fixed pin structure. The fixed pin can be set on the phase adjuster 42, and the phase adjuster 42 can be connected to an external drive device 6 such as a phase adjustment motor through the fixed pin. The connector 1 and the external drive device 6 such as the phase adjustment motor can share the fixed pin for transmission connection with the phase adjuster 42, which reduces excessive modification to the structure of the phase adjuster 42 and reduces processing costs. Alternatively, the fixed pin can also be directly set on the camshaft 3 body.
[0046] Alternatively, the phase adjustment structure 4 can be a structure distinct from the one connected to the external drive device 6, such as the phase adjustment motor. That is, the phase adjustment structure 4 is not used for the transmission connection between the camshaft 3 and the external drive device 6, but is used separately for the transmission connection between the camshaft 3 and the connector 1 when the engine is stopped for maintenance. Compared with the drive of the camshaft 3 by the external drive device 6, the driving force required for the rotation drive component 2 to drive the camshaft 3 is smaller. The phase adjustment structure 4 can be designed to be smaller in size or can be designed to have various connection shapes, such as protrusions or recesses, which reduces the need for the external drive device 6 to drive the phase adjustment structure 4 during its design.
[0047] Optionally, one phase adjustment structure 4 may be provided, located at one end of the camshaft 3, or two phase adjustment structures 4 may be provided, located at both ends of the camshaft 3 respectively, so that both ends of the camshaft 3 can be rotated and adjusted together, reducing the situation where the camshaft 3 is subjected to excessive torque and deformation due to the long axial dimension of the camshaft 3.
[0048] like Figures 1 to 3As shown, in some embodiments, the camshaft axial connection structure 11 includes a first connecting hole, and the phase adjustment structure 4 has a first fixing pin 41. When the camshaft rotation adjustment device rotates to adjust the camshaft 3, the connector 1 is inserted into the first fixing pin 41 through the first connecting hole, and the connector 1 drives the first fixing pin 41 to rotate around the axis of the camshaft 3; and / or,
[0049] The camshaft axial connection structure 11 includes a second fixed pin, and the phase adjustment structure 4 has a second connecting hole. When the camshaft rotation adjustment device rotates to adjust the camshaft 3, the phase adjustment structure 4 is inserted into the second fixed pin through the second connecting hole, and the connector 1 drives the second fixed pin to rotate around the axis of the camshaft 3.
[0050] With this configuration, the camshaft axial connection structure 11 can be simply a first connecting hole, or it can be simply a second fixing pin, or it can be a combination of a first connecting hole and a second fixing pin. The phase adjustment structure 4 can be designed to match the camshaft axial connection structure 11. In use, the connector 1 can be inserted into the phase adjustment structure 4 along the axial direction of the camshaft 3, causing the phase adjustment structure 4 to rotate, thereby causing the camshaft 3 to rotate. After use, simply pull the connector 1 out of the phase adjustment structure 4. The structure is simple and the disassembly and assembly are convenient.
[0051] In some embodiments, one or more sets of first connecting holes are provided, with each set consisting of two first connecting holes. In each set, one first connecting hole is an insertion hole, and the other is an elongated hole. The length of the elongated hole extends along the axis of the camshaft 3. A first fixing pin 41 is correspondingly configured in the insertion hole, and the insertion hole is inserted into the corresponding first fixing pin 41. Similarly, a first fixing pin 41 is correspondingly configured in the elongated hole, and the elongated hole is inserted into the corresponding first fixing pin 41, with the first fixing pin 41 capable of being inserted at different length positions within the elongated hole. When the connector 1 mates with the phase adjustment structure 4, the insertion hole is positioned by one first fixing pin 41, and the elongated hole allows the insertion of another first fixing pin 41. The elongated hole provides a certain range of engagement for the first fixing pin 41, reducing the machining accuracy requirements for the size of the first fixing pin 41 and the spacing between adjacent first fixing pins 41 in the same set. It is also applicable to the use of first fixing pins 41 with different spacings, reducing the need to replace camshaft rotation adjustment devices of different sizes and improving the applicability of the camshaft rotation adjustment device.
[0052] Optionally, the elongated hole can be provided to extend radially along the connector 1, which can form a longer effective mating length in the radial direction of the connector 1 and improve the utilization rate of the elongated hole.
[0053] In some embodiments, the number of camshaft axial connection structures 11 is one. The camshaft axial connection structure 11 has a first rotation limiting surface in the circumferential direction, and the phase adjustment structure 4 has a second rotation limiting surface in the circumferential direction. When the camshaft axial connection structure 11 and the phase adjustment structure 4 are inserted, the first rotation limiting surface and the second rotation limiting surface fit together and abut against each other, reducing the relative rotation between the connector 1 and the phase adjustment structure 4 during the rotation limiting component driving process, and avoiding slippage.
[0054] Alternatively, there may be multiple camshaft axial connection structures 11, which are spaced apart on the connector 1 and all are inserted into the phase adjustment structure 4. The camshaft axial connection structures 11 can be spaced apart on the connector 1, and the number and position of the camshaft axial connection structures 11 can correspond one-to-one with the number and position of the phase adjustment structure 4. Multiple camshaft axial connection structures 11 and phase adjustment structure 4 can form multiple connection and mating points, which can also reduce the relative rotation of the connector 1 and the phase adjustment structure 4 during the rotation limiter drive process, avoid slippage, and reduce the design requirements for the cross-sectional shape of the camshaft axial connection structure 11 itself.
[0055] Optionally, the cross-sectional shape of the camshaft axial connection structure 11 and the phase adjustment structure 4 can be, but is not limited to, circular or polygonal. For example, the sides of the polygon can serve as the first and second rotation limiting surfaces, playing a role in preventing rotation. When the cross-sectional shape of the camshaft axial connection structure 11 and the phase adjustment structure 4 is circular, multiple anti-rotation methods can be designed. Alternatively, a planar cross-section can be designed on the circular sidewall to form the first and second rotation limiting surfaces, both of which can meet the anti-rotation requirements. In this embodiment, two camshaft axial connection structures 11 can be designed. The two camshaft axial connection structures 11 can be symmetrically arranged about the central axis of the connector 1 to facilitate uniform force distribution. The cross-sectional shape of the camshaft axial connection structure 11 can be circular, facilitating alignment and connection operations.
[0056] In some embodiments, the camshaft axial connection structure 11 is provided in multiple groups, with each group consisting of two camshaft axial connection structures 11. The cross-sectional dimensions of the camshaft axial connection structures 11 in different groups are different, and / or the shapes of the camshaft axial connection structures 11 in different groups are different, and / or the spacing of the camshaft axial connection structures 11 in different groups is different, so that each group of camshaft axial connection structures 11 can be adapted to a phase adjustment structure 4, and different groups of camshaft axial connection structures 11 can be adapted to multiple phase adjustment structures 4. In use, the corresponding group of camshaft axial connection structures 11 can be selected and installed on the connector 1 according to the type of phase adjustment structure 4, thereby improving the applicability of the connector 1.
[0057] Optionally, the cross-sectional dimensions and shapes of the camshaft axial connection structures 11 in the same group can be identical, and the corresponding phase adjustment structures 4 of the camshaft axial connection structures 11 in the same group can be interchanged to facilitate changing the installation angle. The cross-sectional dimensions and shapes of the camshaft axial connection structures 11 in the same group can also be different to facilitate fixed-angle installation.
[0058] like Figures 1 to 2 As shown, in some embodiments, the connector 1 is a ring-shaped structure with a weight-reducing hole 12 in the center, enabling a lightweight design and reducing the overall weight of the connector 1. The camshaft axial connection structure 11 extends axially along the ring-shaped structure, facilitating an increase in the effective axial connection length between the camshaft axial connection structure 11 and the phase adjustment structure 4. The ring-shaped structure is coaxially arranged with the camshaft 3, and the axial direction of the ring-shaped structure is also the axial direction of the camshaft 3. The camshaft axial connection structure 11 is located on the outer periphery of the weight-reducing hole 12, increasing the distance between the camshaft axial connection structure 11 and the center of the connector 1, making the drive of the connector 1 more effortless.
[0059] like Figures 1 to 3 As shown, in some embodiments, the rotating drive component 2 includes a transition rod 21 and a gripping rod 22 connected to each other. The transition rod 21 is connected to the connector 1 and is arranged along the axial direction of the camshaft 3. The extension direction of the gripping rod 22 intersects the extension direction of the transition rod 21. The gripping rod 22 can rotate at multiple angles, including the vertical direction of the transition rod 21. The transition rod 21 can separate the rotation range of the gripping rod 22 from the inward position where the power input structure is located, and can also increase the rotation space of the gripping rod 22. It can also avoid the position of the engine housing, reduce the positional interference between the gripping rod 22 and the engine housing when rotating, and make the rotation operation of the wrench more continuous and smooth.
[0060] With this configuration, when the camshaft 3 needs to rotate, the transition rod 21 can be connected and fixed to the connector 1, and the grip rod 22 can be operated by the user for starting and driving, making operation convenient. Although the phase adjustment structure 4 can be exposed in the user's field of vision, after the external drive device 6 such as the phase adjustment motor is removed from the engine housing and separated from the camshaft 3, or after a small hole is provided on the engine housing for the connector 1 to be installed, if the phase adjustment structure 4 is recessed into the engine housing, the transition rod 21 can increase the axial fit distance, making it easier for the connector 1 and the phase adjustment structure 4 to connect smoothly, adapting to various connection types, and also reducing the positional interference between the grip rod 22 and the engine housing.
[0061] Optionally, the rotating drive component 2 can be a manual wrench such as an open-end wrench or a box wrench, or it can be a pneumatic wrench or an electric wrench. The wrench can be a torque wrench or a non-torque wrench, as long as it can drive the connector 1 to rotate.
[0062] Optionally, the extension direction of the transition rod 21 can be perpendicular to the extension direction of the gripping rod 22, so that most of the force applied to the gripping rod 22 can be converted into the rotation of the transition rod 21, which is convenient and efficient. The transition rod 21 and the gripping rod 22 can be integrally formed, and the joint between the two has good structural strength.
[0063] like Figures 1 to 3 As shown, in some embodiments, the rotary drive 2 further includes a torque-fixing structure. The transition rod 21 is located at the center of the connector 1. For example, the transition rod 21 can be fixedly connected to the center hole of the connector 1, or the connector 1 can be a disc-shaped structure, and the connector 1 can be integrally formed with the transition rod 21. The gripping rod 22 is rotatably connected to the transition rod 21 through the torque-fixing structure. The torque-fixing structure is a structure that can preset and precisely control the output torque value. By setting the torque-fixing structure, the rotary drive 2 can form a torque-fixed wrench structure. This ensures that the torque on the phase adjustment structure 4 and the torque on the camshaft 3 are within a certain torque range, avoiding excessive torque that could cause structural damage to the phase adjustment structure 4 and the camshaft 3, making the operation safer.
[0064] Specifically, the torque-controlled structure may include an elastic rod, a torque adjustment mechanism, and a release mechanism. The elastic rod transmits torque through bending or torsional deformation, and its deformation is proportional to the applied torque. One end of the elastic rod can be mounted on the transition rod 21, and the other end can be mounted on the grip rod 22. The preset torque-controlled structure allows the torque to be set by rotating the handle to change the spring compression. The digital torque-controlled structure monitors the torque in real time via electronic sensors and a display screen. When the preset torque is reached, the release mechanism triggers mechanical disengagement or an electrical signal to stop applying force. The torque-controlled structure is based on the lever principle and the spring compression principle. During operation, the elastic rod deforms under force to generate torque. When the actual torque exceeds the spring's set pressure, the release mechanism instantly disengages, achieving precise control. The torque-controlled structure and its principle are similar to related technologies and will not be elaborated further here.
[0065] The fixed torque structure has a preset torque range. The fixed torque structure can be connected to the phase adjustment structure 4 through the transition rod 21 and the connector 1. The gripping rod 22 rotates clockwise and drives the camshaft 3 to rotate until the zero lift position of the oil pump cam 31 is aligned with the installation position of the high pressure oil pump 5. If the gripping rod 22 rotates clockwise to the torque boundary value of the fixed torque structure before the zero lift position of the oil pump cam 31 is aligned with the installation position of the high pressure oil pump 5, the gripping rod 22 needs to stop and rotate counterclockwise until the zero lift position of the oil pump cam 31 is aligned with the installation position of the high pressure oil pump 5. This can effectively improve the safety of the rotation adjustment operation of the rotation drive 2 on the camshaft 3.
[0066] In some embodiments, the torque range of the fixed torque structure is less than or equal to 0.4 N·m. While meeting the rotation requirements of the phase adjustment structure 4, the fixed torque structure can be designed to have the smallest possible torque. The camshaft 3 is a precision component. It is necessary to avoid excessive torque on the end section of the camshaft 3 that is far from the phase adjustment structure 4 due to excessive torque applied by the fixed torque structure, which could cause the camshaft 3 to collide violently or deform with other components.
[0067] Optionally, the selectable torque of the fixed torque structure can be 0.4 N·m, allowing for a larger torque value to be selected within the safe torque range of the fixed torque structure, facilitating rapid adjustment of the camshaft 3 rotation and improving maintenance efficiency. Alternatively, the selectable torque of the fixed torque structure can be 0.3 N·m, allowing for a torque value slightly below the critical value to be selected within the safe torque range of the fixed torque wrench, reducing torque fluctuations caused by unstable force application during operation of the fixed torque structure, and improving the safety of the fixed torque structure in adjusting the rotation of the camshaft 3.
[0068] like Figures 1 to 3 As shown, in some embodiments, the connection between the connector 1 and the rotary drive component 2 can be, but is not limited to, an integral or detachable connection. For example, the connector 1 and the rotary drive component 2 can be integrally formed, reducing the risk of separation and improving the stability of the integrated structure. The joint between the two components has high structural strength and strong torque resistance. Alternatively, the connection between the connector 1 and the rotary drive component 2 can be a detachable connection in the form of threads, snap-fit, or plug-in. The connector 1 can be designed with various replaceable connection structures, requiring only the design of connectors 1 with different structural shapes or sizes, thus reducing the design requirements for the rotary drive component 2.
[0069] like Figures 1 to 3 As shown, in some embodiments, an oil pump cam 31 is fixedly mounted on the camshaft 3. The oil pump cam 31 has a base circle wall surface 311, which can rotate relative to the oil pump mounting position. The camshaft rotation adjustment device also includes a base circle position detection element, which is used to detect the relative position of the base circle wall surface 311 and the oil pump mounting position.
[0070] Here, the cam base circle refers to the smallest circular boundary used to define the cam size in cam design; that is, the base circle wall 311 is the wall surface where the smallest circular boundary of the oil pump cam 31 is located. The zero-lift position of the oil pump cam 31 means that when the oil pump cam 31 rotates to the point where the base circle wall 311 is aligned with the oil pump mounting position, the high-pressure oil pump 5, as the follower driven by the oil pump cam 31, does not undergo displacement on the base circle wall 311, and the lift is zero. The high-pressure oil pump 5 may have an oil pump tappet 51 as a power input, and the oil pump tappet 51 abuts against the base circle wall 311.
[0071] With this configuration, this embodiment can reduce the need for manual estimation of the position of the base circle wall 311 by setting a base circle position detection device. Since the oil pump cam 31 is located inside the engine housing, the accuracy of judging the relative position of the base circle wall 311 and the oil pump installation position can be improved by setting a base circle position detection device for detection.
[0072] Optionally, the base circle position detection component can be set at the base circle wall 311, the circumferential position of the oil pump cam 31, or the oil pump mounting position, and can be selected and installed according to the type of base circle position detection component.
[0073] In some embodiments, the base circle position detection component includes a position sensor, which is disposed at the base circle wall 311 and / or the oil pump mounting position. The position sensor detects the distance or rotation angle of the base circle wall 311 relative to the oil pump mounting position. When the actual detected value of the distance or rotation angle of the base circle wall 311 relative to the oil pump mounting position is equal to a preset range, it can be determined that the base circle wall 311 is aligned with the oil pump mounting position. Installing the high-pressure oil pump 5 at the oil pump mounting position will align the high-pressure oil pump 5 with the base circle wall 311.
[0074] And / or, the base circle position detection component includes a measuring scale, which is inserted at the oil pump mounting position and its end abuts against the surface of the oil pump cam 31. When the oil pump cam 31 rotates, the end of the measuring scale can abut against different positions on the surface of the oil pump cam 31. The measuring scale slides at the oil pump mounting position, and any reference position can be selected at the oil pump mounting position. The scale reading of the measuring scale at the reference position shows the distance from different positions of the oil pump cam 31 to the reference position. By reading and comparing the reading of the measuring scale at the same reference position at the oil pump mounting position, it can be determined whether the oil pump mounting position is aligned with the base circle wall 311. For example, when the scale reading of the measuring scale at the reference position is the minimum value, it can be determined that the oil pump mounting position is aligned with the base circle wall 311.
[0075] In some embodiments, the phase adjustment structure 4 can be configured as a phase adjuster 42, which can be a harmonic reducer. The power input structure is a wave generator of the harmonic reducer, and the power output structure is a flexible wheel of the harmonic reducer. The multi-tooth meshing and error averaging characteristics of the harmonic reducer can achieve micron-level transmission accuracy. When the rotation drive 2 applies force to the harmonic reducer through the connector 1, it can achieve high-precision torque transmission, which facilitates high-precision rotation adjustment of the camshaft 3. It is also small in size and light in weight, making it easier to integrate in the limited space of the engine. The rotational inertia of the power input structure is small, making it easier to be driven by the small torque of the rotation drive 2.
[0076] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A camshaft rotational adjustment device, an end portion of a camshaft (3) being provided with a phase adjustment structure (4), characterized in that, The camshaft rotation adjustment device includes: Connector (1), the connector (1) has a camshaft axial connection structure (11), the camshaft axial connection structure (11) is detachably connected to the phase adjustment structure (4); Rotation drive (2), the rotation drive (2) is connected to the connector (1) in a transmission manner; When the camshaft rotation adjustment device rotates to adjust the camshaft (3), the rotation drive (2) drives the connector (1) to rotate, and the connector (1) drives the camshaft (3) to rotate through the camshaft axial connection structure (11) and the phase adjustment structure (4) in the connected state.
2. A camshaft rotational adjustment device as claimed in claim 1, characterised in that, The camshaft axial connection structure (11) includes a first connecting hole, and the phase adjustment structure (4) has a first fixing pin (41). When the camshaft rotation adjustment device rotates to adjust the camshaft (3), the connector (1) is inserted into the first fixing pin (41) through the first connecting hole, and the connector (1) drives the first fixing pin (41) to rotate around the axis of the camshaft (3); and / or, The camshaft axial connection structure (11) includes a second fixing pin, and the phase adjustment structure (4) has a second connecting hole. When the camshaft rotation adjustment device rotates to adjust the camshaft (3), the phase adjustment structure (4) is inserted into the second fixing pin through the second connecting hole, and the connector (1) drives the second fixing pin to rotate around the axis of the camshaft (3).
3. A camshaft rotational adjustment device as claimed in claim 2, characterised in that, The first connecting hole is provided in one or more sets, with each pair of first connecting holes forming a set. In each set, one of the two first connecting holes is a plug hole, and the other is an elongated hole. The length extension direction of the elongated hole intersects the axis of the camshaft (3). The plug hole is correspondingly configured with a first fixing pin (41). The plug hole is plugged into the corresponding first fixing pin (41). The elongated hole is correspondingly configured with a first fixing pin (41). The elongated hole is plugged into the corresponding first fixing pin (41), and the first fixing pin (41) can be plugged into different length positions of the elongated hole.
4. A camshaft rotational adjustment device as claimed in claim 2, characterised in that, The number of camshaft axial connection structures (11) is one. The camshaft axial connection structure (11) has a first rotation limiting surface in the circumferential direction, and the phase adjustment structure (4) has a second rotation limiting surface in the circumferential direction. When the camshaft axial connection structure (11) and the phase adjustment structure (4) are inserted, the first rotation limiting surface and the second rotation limiting surface fit and abut against each other. Alternatively, the number of camshaft axial connection structures (11) is multiple. Multiple camshaft axial connection structures (11) are spaced apart on the connector (1) and are all inserted into the phase adjustment structure (4).
5. Camshaft rotation adjusting device according to any of claims 1-4, characterized in that The camshaft axial connection structure (11) is provided in multiple sets, with each set consisting of two camshaft axial connection structures (11). The cross-sectional dimensions of the camshaft axial connection structures (11) in different sets are different, and / or the shapes of the camshaft axial connection structures (11) in different sets are different, and / or the spacing of the camshaft axial connection structures (11) in different sets is different.
6. Camshaft rotation adjusting device according to any of claims 1-4, characterized in that The connector (1) is a ring structure with a weight reduction hole (12) in the middle. The camshaft axial connection structure (11) extends along the axial direction of the ring structure and is located on the outer periphery of the weight reduction hole (12).
7. Camshaft rotation adjusting device according to any of claims 1-4, characterized in that The rotation drive (2) includes a transition rod (21) and a gripping rod (22) connected to each other. The transition rod (21) is connected to the connector (1). The transition rod (21) is arranged along the axial direction of the camshaft (3). The extension direction of the gripping rod (22) intersects the extension direction of the transition rod (21).
8. A camshaft rotational adjustment device as claimed in claim 7, characterised in that, The rotation drive (2) also includes a fixed torque structure. The transition rod (21) is located at the center of the connector (1). The gripping rod (22) is rotatably connected to the transition rod (21) through the fixed torque structure.
9. A camshaft rotational adjustment device according to claim 8, characterised in that, The torque range of the constant torque structure is less than or equal to 0.4 N·m.
10. Camshaft rotation adjusting device according to any of claims 1-4, characterized in that The connector (1) is integrally formed with the rotating drive (2), or the connector (1) and the rotating drive (2) are detachably connected.