A camshaft structure and engine

Abstract

The utility model discloses a cam shaft structure and engine, include: cam shaft, extend a certain length along the axial direction, combination cam, combination cam is equipped with cam shaft hole, combination cam is sleeved in cam shaft through cam shaft hole, combination cam includes a plurality of cam components along the circumferential split setting of cam shaft hole, and cam component is equipped with axle hole groove, and a plurality of cam components can detachable connection, and the axle hole groove of a plurality of cam components defines the cam shaft hole together, and the outer circular arc surface of a plurality of cam components defines the outer profile surface of combination cam together. After a plurality of cam components detachable connection, the original cam profile restores and is firmly installed on cam shaft. The combination cam of a plurality of cam components combination connection, keep the original cam profile, when cam wear, can through the disassembly combination cam of a plurality of cam components, realize individual replacement, need not to disassemble other accessories. Cam replacement is convenient, has great application value in the maintenance of real ship, especially the process of first-aid repair.

Description

Technical Field

[0001] This invention relates to the field of camshafts, and in particular to a camshaft structure and an engine. Background Technology

[0002] The fuel injection cam is one of the important components of a diesel engine. The fuel injection cam, which rotates around its center, drives the fuel injection pump through rollers to provide high-pressure fuel. The fuel is then injected into the combustion chamber through the injector nozzle, atomized, and burned, enabling the diesel engine to operate normally.

[0003] The existing fuel injection camshaft and camshaft are machined as a single unit, which is a complicated process. When the camshaft is damaged, the entire camshaft needs to be replaced, increasing maintenance costs and making it inconvenient to use.

[0004] To address the aforementioned issues, existing technologies have proposed modular camshafts. This approach involves separately molding the cam and camshaft, further creating a camshaft hole on the cam, and then inserting the camshaft into the camshaft hole, thus axially mounting the cam onto the camshaft. However, when multiple cams are mounted on a single camshaft, they must be installed sequentially onto the camshaft. Furthermore, since cams are wear parts and require periodic replacement, this modular design necessitates removing all other cams from the camshaft before replacing a single cam, making cam installation and removal extremely inconvenient.

[0005] In summary, the problems existing in the relevant technologies urgently need to be solved. Utility Model Content

[0006] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a camshaft structure and an engine.

[0007] The technical solution adopted by this utility model to solve its technical problem is:

[0008] In a first aspect, a camshaft structure includes:

[0009] A camshaft that extends a certain length axially.

[0010] A composite cam is provided with a camshaft hole. The composite cam is fitted onto a camshaft through the camshaft hole. The composite cam includes multiple cam components that are circumferentially separated along the camshaft hole. Each cam component has a shaft hole groove. The multiple cam components are detachably connected. The shaft hole grooves of the multiple cam components together define the camshaft hole. The outer arc surfaces of the multiple cam components together define the outer contour surface of the composite cam.

[0011] In conjunction with the first aspect, in some implementations of the first aspect, the camshaft hole is a circular hole, the shaft hole groove of the cam component is an arc groove, and the arc of the arc groove of the plurality of cam components is not greater than π.

[0012] In combination with the first aspect and the above-described implementations, in some implementations of the first aspect, the combined cam is integrally machined according to the design contour, and then cut open along the diameter direction of the camshaft hole to form a first cam component and a second cam component, wherein the first cam component and the second cam component are detachably connected.

[0013] In combination with the first aspect and the above-described implementations, in some implementations of the first aspect, the first cam component has a first fastener mounting hole on the outer side of the arc groove, and the second cam component has a second fastener mounting hole on the outer side of the arc groove. After the first cam component and the second cam component are combined, the first fastener mounting hole and the second fastener mounting hole are aligned. The first cam component and the second cam component are connected by fasteners disposed in the first fastener mounting hole and the second fastener mounting hole.

[0014] In combination with the first aspect and the above-described implementations, in some implementations of the first aspect, the first fastener mounting hole includes a screw hole perpendicular to the cross-section, the second fastener mounting hole includes a threaded hole perpendicular to the cross-section, and the first cam component and the second cam component are connected to the threaded hole by a screw passing through the screw hole.

[0015] In combination with the first aspect and the above-described implementations, in some implementations of the first aspect, the first cam component has a countersunk hole at the outer end of the screw hole, and the head of the screw is recessed into the countersunk hole.

[0016] In combination with the first aspect and the above-described implementations, in some implementations of the first aspect, the combined cam has a first axial end face and a second axial end face on both sides of the outer contour surface, a first chamfered slope is provided between the outer contour surface and the first axial end face, a second chamfered slope is provided between the outer contour surface and the second axial end face, the first fastener mounting hole is disposed on the first chamfered slope and the second chamfered slope, and the second fastener mounting hole is disposed on the first chamfered slope and the second chamfered slope corresponding to the first fastener mounting hole.

[0017] In combination with the first aspect and the above-described implementations, in some implementations of the first aspect, the first cam component is provided with axial insertion teeth in the cross-section, and the second cam component is provided with axial insertion grooves in the cross-section. The axial insertion teeth of the first cam component are axially inserted into the axial insertion grooves of the second cam component, and the first cam component and the second cam component are connected by the cooperation of the axial insertion teeth and the axial insertion grooves.

[0018] In combination with the first aspect and the above-described implementations, in some implementations of the first aspect, the camshaft is provided with a radial pin hole, and the combined cam is provided with a pin that is inserted into the radial pin hole.

[0019] The second aspect is an engine comprising the camshaft structure described in any implementation of the first aspect.

[0020] One of the above technical solutions has at least one of the following advantages or beneficial effects: In the technical solution of this utility model, the combined cam includes multiple cam components, which are separately arranged circumferentially along the camshaft hole. After the multiple cam components are detachably connected, the original cam profile is restored and firmly installed on the camshaft. The combined cam, after the multiple cam components are combined and connected, maintains the original cam profile and works reliably. When the cam is worn, it can be replaced individually by disassembling the multiple cam components of the combined cam without disassembling other accessories. The processing technology of the combined cam is mature and easy to manufacture; the cam replacement is convenient, and it has great application value in actual ship maintenance, especially in emergency repairs.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is a schematic diagram of one embodiment of the camshaft structure of this utility model;

[0024] Figure 2 yes Figure 1 Cross-sectional view at point AA. Detailed Implementation

[0025] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0026] In this utility model, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this utility model, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0027] In this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the stated number; "above," "below," "within," "not greater than," "not less than," etc. are understood to include the stated number. In the description of this utility model, if "first" or "second" is used, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0028] In this utility model, unless otherwise explicitly defined, terms such as "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model based on the specific content of the technical solution.

[0029] See Figure 1 , Figure 2 This utility model provides a camshaft structure, including a camshaft 100 and a combined cam 200. The camshaft 100 extends axially for a certain length. The combined cam 200 has a camshaft hole and is fitted onto the camshaft 100 through the camshaft hole, allowing it to rotate with the camshaft 100. The cross-sectional shapes of the camshaft hole and the camshaft 100 are matched and can be circular, square, or other shapes. The combined cam 200 includes multiple cam components circumferentially separated along the camshaft hole. Each cam component is an incomplete cam, and each cam component has a shaft hole groove 201. The multiple cam components are detachably connected, and the shaft hole grooves 201 of the multiple cam components collectively define the camshaft hole. The outer arc surfaces of the multiple cam components collectively define the outer contour surface 209 of the combined cam 200.

[0030] Combination Figure 1 , Figure 2 In this invention, the combined cam 200 comprises multiple cam components, which are separately arranged circumferentially along the camshaft hole. After the multiple cam components are detachably connected, the original cam profile is restored and securely mounted on the camshaft 100. The combined cam 200, after the multiple cam components are combined and connected, maintains the original cam profile and operates reliably. When the cam wears, it can be replaced individually by disassembling the multiple cam components of the combined cam 200 without disassembling other accessories. The combined cam 200 has a mature processing technology and is easy to manufacture; cam replacement is convenient, making it extremely valuable in actual ship repair, especially in emergency repairs.

[0031] In some embodiments, see Figure 1 , Figure 2 The camshaft bore is a circular hole, and the cam component's shaft hole groove 201 is an arc-shaped groove. The curvature of the arc-shaped grooves of multiple cam components is no greater than π. In other words, the arc-shaped groove of each cam component is less than or equal to half a circumference, ensuring that each cam component can allow the camshaft 100 to be inserted into its arc-shaped groove from the side of the camshaft 100, thus facilitating disassembly. It is understood that when the cross-sectional shape of the camshaft bore and the camshaft 100 is not circular, the above requirements do not apply.

[0032] Further, see Figure 1 The combined cam 200 is integrally machined according to the design contour, and then cut open along the diameter direction of the camshaft hole to form a first cam component 202 and a second cam component 203. The first cam component 202 and the second cam component 203 are detachably connected. In this embodiment, the number of cam components is preferably set to two, which facilitates the machining and manufacturing of each cam component and the quick assembly and disassembly of the combined cam 200 on the camshaft 100.

[0033] In some embodiments, see Figure 2 The first cam component 202 has a first fastener mounting hole 204 on the outer side of the arc-shaped groove, and the second cam component 203 has a second fastener mounting hole 205 on the outer side of the arc-shaped groove. After the first cam component 202 and the second cam component 203 are combined, the first fastener mounting hole 204 and the second fastener mounting hole 205 are aligned. The first cam component 202 and the second cam component 203 are connected by fasteners 300 provided in the first fastener mounting hole 204 and the second fastener mounting hole 205. In this embodiment, the first cam component 202 and the second cam component 203 are detached and connected by fasteners 300, which is simple in structure and convenient for disassembly and assembly.

[0034] Further, see Figure 2 The first fastener mounting hole 204 includes a screw hole perpendicular to the cross-section, and the second fastener mounting hole 205 includes a threaded hole perpendicular to the cross-section. The first cam component 202 and the second cam component 203 are connected by a screw passing through the screw hole and connected to the threaded hole. In this embodiment, the fastener 300 is preferably a screw, and the locking direction of the fastener 300 is further set to be perpendicular to the cross-section, so that the force direction of the fastener 300 is along the length direction of the fastener 300, thereby optimizing the mechanical properties of the fastener 300.

[0035] Among them, see Figure 1 , Figure 2 The first cam component 202 has a countersunk hole 206 at the outer end of the screw hole. The head of the screw is recessed into the countersunk hole 206 to avoid exposure and ensure that the combined cam 200 can work normally without interference.

[0036] In some embodiments, see Figure 1 , Figure 2 The combined cam 200 has a first axial end face 207 and a second axial end face 208 on both sides of the outer contour surface 209. A first chamfered slope 210 is provided between the outer contour surface 209 and the first axial end face 207, and a second chamfered slope 211 is provided between the outer contour surface 209 and the second axial end face 208. A first fastener mounting hole 204 is disposed on the first chamfered slope 210 and the second chamfered slope 211, and a second fastener mounting hole 205 is disposed on the first chamfered slope 210 and the second chamfered slope 211 corresponding to the first fastener mounting hole 204. In this embodiment, the first fastener mounting hole 204 and the second fastener mounting hole 205 are disposed on the first chamfered slope 210 and the second chamfered slope 211, avoiding the outer contour surface 209 of the combined cam 200, maintaining the original cam profile, and the transition at the open edge joint is smooth, ensuring reliable operation.

[0037] In addition to being detachably connected using fasteners 300, the first cam component 202 and the second cam component 203 can also be connected through a mutual engagement mechanism. For example, in some embodiments, the first cam component 202 has axial insertion teeth in its cross-section, and the second cam component 203 has axial insertion grooves in its cross-section. The axial insertion grooves can be trapezoidal or dovetail grooves. The axial insertion teeth of the first cam component 202 are inserted axially into the axial insertion grooves of the second cam component 203, and the first cam component 202 and the second cam component 203 are connected through the engagement of the axial insertion teeth and the axial insertion grooves. In this embodiment, there is no need to configure additional fasteners 300; the connection is achieved directly using the structure of the cam components themselves.

[0038] In some embodiments, see Figure 1 The camshaft 100 is provided with a radial pin hole, and the combined cam 200 is provided with a pin 400 that is inserted into the radial pin hole. The pin 400 can further limit the circumferential displacement between the camshaft 100 and the combined cam 200, thereby improving the integrity between the camshaft 100 and the combined cam 200.

[0039] An embodiment of this utility model also provides an engine, including the camshaft structure of any of the above embodiments, wherein the camshaft structure includes, but is not limited to, a fuel injection cam used as an engine.

[0040] In the description of this specification, references to terms such as "example," "embodiment," or "some embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] Of course, the present invention is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A camshaft structure, characterized in that, include: A camshaft that extends a certain length axially. A composite cam is provided with a camshaft hole. The composite cam is fitted onto a camshaft through the camshaft hole. The composite cam includes multiple cam components that are circumferentially separated along the camshaft hole. Each cam component has a shaft hole groove. The multiple cam components are detachably connected. The shaft hole grooves of the multiple cam components together define the camshaft hole. The outer arc surfaces of the multiple cam components together define the outer contour surface of the composite cam.

2. The camshaft structure according to claim 1, characterized in that, The camshaft hole is a round hole, and the shaft hole groove of the cam component is an arc-shaped groove, wherein the arc of the arc-shaped groove of the plurality of cam components is not greater than π.

3. The camshaft structure according to claim 2, characterized in that, The combined cam is integrally machined according to the design contour, and then cut open along the diameter direction of the camshaft hole to form a first cam component and a second cam component. The first cam component and the second cam component are detachably connected.

4. The camshaft structure according to claim 3, characterized in that, The first cam component has a first fastener mounting hole on the outside of the arc groove, and the second cam component has a second fastener mounting hole on the outside of the arc groove. After the first cam component and the second cam component are combined, the first fastener mounting hole and the second fastener mounting hole are aligned. The first cam component and the second cam component are connected by fasteners provided in the first fastener mounting hole and the second fastener mounting hole.

5. The camshaft structure according to claim 4, characterized in that, The first fastener mounting hole includes a screw hole perpendicular to the cross-section, and the second fastener mounting hole includes a threaded hole perpendicular to the cross-section. The first cam component and the second cam component are connected to the threaded hole by a screw passing through the screw hole.

6. The camshaft structure according to claim 5, characterized in that, The first cam component has a countersunk hole at the outer end of the screw hole, and the head of the screw is recessed into the countersunk hole.

7. The camshaft structure according to claim 4, characterized in that, The combined cam has a first axial end face and a second axial end face on both sides of the outer contour surface. A first chamfered slope is provided between the outer contour surface and the first axial end face, and a second chamfered slope is provided between the outer contour surface and the second axial end face. The first fastener mounting hole is provided on the first chamfered slope and the second chamfered slope, and the second fastener mounting hole is provided on the first chamfered slope and the second chamfered slope, corresponding to the first fastener mounting hole.

8. The camshaft structure according to claim 3, characterized in that, The first cam component has axial insertion teeth in the cross section, and the second cam component has axial insertion grooves in the cross section. The axial insertion teeth of the first cam component are inserted axially into the axial insertion grooves of the second cam component. The first cam component and the second cam component are connected by the cooperation of the axial insertion teeth and the axial insertion grooves.

9. The camshaft structure according to claim 1, characterized in that, The camshaft is provided with a radial pin hole, and the combined cam is provided with a pin that is inserted into the radial pin hole.

10. An engine, characterized in that, The camshaft structure includes any one of claims 1 to 9.

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