Engine camshaft

Abstract

The utility model belongs to the technical field of engine accessories, and particularly relates to an engine cam shaft which comprises a shaft body and two cam assemblies, the two cam assemblies are detachably connected to the shaft body and installed on the left side and the right side of the shaft body respectively, and each cam assembly comprises a sleeve and a cam. The engine camshaft comprises a shaft body and a sleeve, the shaft body is sleeved with the sleeve in a positioning mode, the sleeve is fixedly connected with a cam, two bosses are arranged in the middle of the shaft body, and the end, close to the bosses, of the sleeve makes contact with the bosses. In the production process of the engine cam shaft, the shaft body and the cam assembly are independently machined, when a certain assembly is detected to be a defective product, the remaining part can still be used continuously, and when a certain part of the engine cam shaft is accidentally damaged, the part can be independently replaced through the structure.

Description

Technical Field

[0001] The utility model relates to the field of engine accessories, in particular to an engine camshaft. Background Art

[0002] The camshaft is an important component in the engine's valve train, used to drive the opening and closing of the valves, determine the valve lift variation pattern, and directly affect engine performance, fuel economy, and emissions.

[0003] Most of the existing engine camshafts are of an integrated structure. During mass production, if they are found to be defective after processing (such as due to processing size problems, cam position problems, etc.), the entire engine camshaft will be scrapped. Therefore, the utility model provides an engine camshaft. Utility Model Content

[0004] The purpose of the utility model is to provide an engine camshaft to solve the above problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an engine camshaft, comprising a shaft body and a cam assembly, the shaft body being detachably connected to a cam assembly, the number of the cam assemblies being two, the two cam assemblies being respectively mounted on the left and right sides of the shaft body, the cam assembly comprising a sleeve and a cam, the sleeve being positioned and sleeved on the shaft body, the sleeve being fixedly connected to the cam, two bosses being arranged in the middle of the shaft body, the end of the sleeve close to the boss being in contact with the boss, a fixing bolt being installed between the boss and the sleeve, a slot being provided on a side of the sleeve close to the boss, an insert block being adapted to the slot being provided on an end of the boss close to the sleeve, the insert block being inserted into the slot.

[0006] Preferably, there are two cams on the sleeve, and the angles between the two cams are different.

[0007] Preferably, there is a transition fit between the insert block and the slot.

[0008] Preferably, the sleeve has first threaded holes evenly formed at one end close to the boss, the fixing bolt passes through the boss and is screwed to the first threaded hole, and thread sealant is applied between the fixing bolt and the first threaded hole.

[0009] Preferably, a fastening bolt is installed at one end of the sleeve away from the boss, a second threaded hole is opened on the sleeve, the fastening bolt is screwed to the second threaded hole, and a receiving hole is opened on the outside of the second threaded hole, the head of the fastening bolt is located in the receiving hole, and thread sealant is applied between the fastening bolt and the second threaded hole.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] 1) The engine camshaft of the utility model is a combined structure, which is composed of a shaft body and a cam assembly. It is easy to assemble and has a stable structure. During the production process of the engine camshaft, the shaft body and the cam assembly are processed separately. When a component is found to be defective, the remaining parts can still be used. In addition, this structure can replace a part of the engine camshaft separately when it is accidentally damaged.

[0012] 2) The sleeve is limited by the boss, and the insert block is inserted into the slot, and then the boss and the sleeve are connected by the fixing bolts, so that the shaft can stably drive the cam to rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the first schematic diagram of the structure of the utility model;

[0014] Figure 2 This is the second schematic diagram of the structure of the utility model;

[0015] Figure 3 This is a schematic diagram of the structure of the cam assembly of the utility model;

[0016] Figure 4 This is a schematic diagram of the second threaded hole structure of the utility model.

[0017] In the figure: 1, shaft; 2, cam assembly; 3, sleeve; 4, cam; 5, boss; 6, fixing bolt; 7, slot; 8, first threaded hole; 9, storage hole; 10, fastening bolt; 11, second threaded hole. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0020] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0021] Example:

[0022] See also Figure 1-4 The utility model provides a technical solution: an engine camshaft, comprising a shaft body 1 and a cam assembly 2, the shaft body 1 is detachably connected with the cam assembly 2, the number of the cam assemblies 2 is two, and the two cam assemblies 2 are respectively installed on the left and right sides of the shaft body 1. The engine camshaft is used for a single-cylinder engine or a two-cylinder engine. If it is used for a single-cylinder engine, the number of the cam assembly 2 is one, and the cam assembly 2 comprises a sleeve 3 and a cam 4. The sleeve 3 is positioned and sleeved on the shaft body 1, and the cam 4 is fixedly connected to the sleeve 3. The opening and closing of the engine valve is driven by the cam 4. Two bosses 5 are arranged in the middle of the shaft body 1, and one end of the sleeve 3 close to the boss 5 contacts the boss 5. A fixing bolt 6 is installed between the boss 5 and the sleeve 3, and a slot 7 is opened on one side of the sleeve 3 close to the boss 5, and an insert block adapted to the slot 7 is arranged on the end of the boss 5 close to the sleeve 3 (not shown in the figure, attached Figure 3 The slot 7 is shown, and the structural appearance of the plug block can be known from the slot 7. The plug block is inserted into the slot 7, and the sleeve 3 is positioned and sleeved on the shaft body 1 through the cooperation between the plug block and the slot 7.

[0023] There are two cams 4 on the sleeve 3 , and the angles between the two cams 4 are different.

[0024] There is a transition fit between the insert block and the slot 7.

[0025] One end of the sleeve 3 close to the boss 5 is evenly provided with first threaded holes 8, and the fixing bolts 6 pass through the boss 5 and are screwed to the first threaded holes 8, and thread sealant is applied between the fixing bolts 6 and the first threaded holes 8, so the connection is convenient.

[0026] A fastening bolt 10 is installed at one end of the sleeve 3 away from the boss 5, and a second threaded hole 11 is opened on the sleeve 3. The fastening bolt 10 is screwed with the second threaded hole 11, and a receiving hole 9 is opened on the outer side of the second threaded hole 11. The head of the fastening bolt 10 is located in the receiving hole 9, and thread sealant is applied between the fastening bolt 10 and the second threaded hole 11. The fastening bolt 10 is used to further improve the stability of the cam assembly 2 fixed on the shaft body 1.

[0027] Working principle: The engine camshaft is a combined structure, which is composed of a shaft body 1 and a cam assembly 2. It is easy to assemble and has a stable structure. During the production process of the engine camshaft, the shaft body 1 and the cam assembly 2 are processed separately. When a component is found to be defective, the remaining parts can still be used. In addition, when a part of the engine camshaft is accidentally damaged, this structure can be replaced separately. The sleeve 3 is limited by the boss 5, and the insert block is inserted into the slot 7. The boss 5 and the sleeve 3 are then connected by the fixing bolt 6, so that the shaft body 1 can stably drive the cam 4 to rotate.

[0028] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the utility model, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0029] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An engine camshaft, comprising a shaft body (1) and a cam assembly (2), characterized in that: The shaft body (1) is detachably connected to a cam assembly (2). The number of the cam assemblies (2) is two. The two cam assemblies (2) are respectively mounted on the left and right sides of the shaft body (1). The cam assembly (2) comprises a sleeve (3) and a cam (4). The sleeve (3) is positioned and sleeved on the shaft body (1). The cam (4) is fixedly connected to the sleeve (3). Two bosses (5) are arranged in the middle of the shaft body (1). One end of the sleeve (3) close to the boss (5) contacts the boss (5). A fixing bolt (6) is installed between the boss (5) and the sleeve (3). A slot (7) is provided on one side of the sleeve (3) close to the boss (5). An insert block matched with the slot (7) is provided on one end of the boss (5) close to the sleeve (3). The insert block is inserted into the slot (7).

2. An engine camshaft according to claim 1, characterized in that: There are two cams (4) on the sleeve (3), and the angles between the two cams (4) are different.

3. The engine camshaft according to claim 1, characterized in that: There is a transition fit between the insert block and the slot (7).

4. The engine camshaft according to claim 1, characterized in that: The sleeve (3) is evenly provided with a first threaded hole (8) at one end close to the boss (5), the fixing bolt (6) passes through the boss (5) and is screwed to the first threaded hole (8), and thread sealant is applied between the fixing bolt (6) and the first threaded hole (8).

5. The engine camshaft according to claim 1, characterized in that: A fastening bolt (10) is installed at one end of the sleeve (3) away from the boss (5), and a second threaded hole (11) is provided on the sleeve (3). The fastening bolt (10) is threadedly connected to the second threaded hole (11), and a receiving hole (9) is provided on the outer side of the second threaded hole (11). The head of the fastening bolt (10) is located in the receiving hole (9), and thread sealant is applied between the fastening bolt (10) and the second threaded hole (11).

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