Crankshaft

Abstract

The utility model belongs to the technical field of crankshafts, and particularly relates to a crankshaft which comprises a crankshaft main journal and at least one connecting arm connected with the crankshaft main journal, the connecting arm is detachably connected with a crank through a connecting rod assembly, and the connecting rod assembly comprises a crankshaft main journal and a crankshaft main journal, the first connecting part is fixedly connected to the connecting arm, and the first connecting part is provided with a positioning hole; the second connecting part is fixedly connected to the crank, the second connecting part is provided with a positioning convex block capable of extending into the positioning hole, and a threaded hole is formed in the positioning convex block; the connecting arm is provided with a mounting hole communicated with the positioning hole, the bolt sequentially penetrates through the mounting hole and the positioning hole to be in threaded connection with the positioning convex block, and during disassembly and replacement, the first connecting part and the second connecting part are disconnected by loosening the bolt, so that the crank or the connecting arm can be replaced, and the whole crankshaft does not need to be replaced; the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of crankshafts, and in particular relates to a crankshaft. Background Art

[0002] The crankshaft is one of the most important parts in the engine. Its function is to convert the linear reciprocating motion of the piston into rotary motion and output torque to drive the external working device connected to it. Usually, one side of the engine's crankshaft is the flywheel end shaft section, which is mainly connected to the engine flywheel.

[0003] In order to ensure the working strength and rigidity of the crankshaft, the crankshaft usually has a considerable weight, which invisibly increases the weight of the engine and makes the engine fuel economy poor. In addition, based on the working principle of the crankshaft, the connecting rod neck of the crankshaft has to bear huge and repeated impact loads, so the crankshaft connecting rod wears quickly and has a short life. The traditional crankshaft is a whole, and each part cannot be disassembled and replaced. When the crankshaft connecting rod is damaged, the entire crankshaft needs to be replaced, which has a high maintenance cost. For this reason, an improved crankshaft is designed. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the utility model provides a crankshaft to solve the above-mentioned problems in the background technology.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A crankshaft comprises a crankshaft main journal and at least one connecting arm connected to the crankshaft main journal, wherein the connecting arm is detachably connected to a crank via a connecting rod assembly, wherein the connecting rod assembly comprises:

[0007] A first connecting portion, wherein the first connecting portion is fixedly connected to the connecting arm, and the first connecting portion has a positioning hole;

[0008] A second connecting portion, the second connecting portion is fixedly connected to the crank, the second connecting portion has a positioning protrusion that can be inserted into the positioning hole, and the positioning protrusion is provided with a threaded hole;

[0009] The bolt is provided on the connecting arm with a mounting hole connected with the positioning hole, and the bolt passes through the mounting hole and the positioning hole in sequence and is threadedly connected with the positioning protrusion.

[0010] By adopting the above-mentioned structural design, the crankshaft is designed as an assembled structure formed by combining and connecting multiple sections, including a crankshaft main journal and multiple cranks, wherein two cranks are connected to both ends of the crankshaft main journal, and the crank on the crankshaft main journal is detachably connected to other cranks through a connecting arm and a connecting rod assembly, and the connecting rod assembly includes a first connecting portion and a second connecting portion respectively arranged at the end of the connecting arm and the end of the crank, and the first connecting portion and the second connecting portion are connected by bolts. When disassembling and replacing, the first connecting portion and the second connecting portion are disconnected by loosening the bolts, and the crank or the connecting arm can be replaced without replacing the entire crankshaft, thereby reducing maintenance costs.

[0011] Furthermore, the first connecting portion includes a circular first connecting block connected to the end of the connecting arm, the positioning hole is coaxially arranged with the first connecting block, and a plurality of outwardly protruding plug posts are arranged in a circular array on the edge of the first connecting block.

[0012] Furthermore, the second connecting portion includes a circular second connecting block connected to the end of the crank, the positioning protrusion and the second connecting block are coaxially arranged and protrude outward, and a plurality of sockets are arranged in a ring array on the edge of the second connecting block.

[0013] By adopting the above structure, a plug post is provided on the first connection block, and a corresponding plug hole is provided on the second connection block. When connecting, the plug post is inserted into the plug hole, which can enhance the torque resistance of the connection between the crank and the connecting arm.

[0014] Furthermore, two cranks are connected to both ends of the crankshaft main journal, the middle portion of the crank is fixedly connected to the crankshaft main journal, and the ends of the crank are connected to a connecting arm via a connecting rod assembly.

[0015] Furthermore, the connecting arm is arranged in an inclined state, and the connecting rod assembly is arranged parallel to the crankshaft main journal.

[0016] Furthermore, it also includes a flywheel end shaft section and an output end shaft section arranged at both ends of the crankshaft.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1. The crankshaft is designed as an assembled structure formed by combining and connecting multiple parts, including a crankshaft main journal and multiple cranks, wherein two cranks are connected to the two ends of the crankshaft main journal, and the crank on the crankshaft main journal is detachably connected to other cranks through a connecting arm and a connecting rod assembly, and the connecting rod assembly includes a first connecting part and a second connecting part respectively arranged at the end of the connecting arm and the end of the crank, and the first connecting part and the second connecting part are connected by bolts. When disassembling and replacing, the first connecting part and the second connecting part are disconnected by loosening the bolts, and the crank or the connecting arm can be replaced without replacing the entire crankshaft, thereby reducing maintenance costs;

[0019] 2. The first connection block is provided with a plug post, and the second connection block is correspondingly provided with a socket. When connecting, the plug post is inserted into the socket, which can enhance the torque resistance of the connection between the crank and the connecting arm. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a crankshaft embodiment of the utility model;

[0021] Figure 2 This is a schematic structural diagram of a crank and a connecting arm in a crankshaft embodiment of the utility model;

[0022] Figure 3 It is a three-dimensional structural schematic diagram of a connecting rod assembly in a crankshaft embodiment of the utility model;

[0023] The reference numerals in the drawings of the specification include:

[0024] A crankshaft main journal (1), a crank (2), a connecting rod assembly (3), a bolt (31), a first connecting portion (32), a first connecting block (321), a positioning hole (322), a plug column (323), a second connecting portion (33), a second connecting block (331), a positioning protrusion (332), a plug hole (333), a connecting arm (4), a mounting hole (41), a flywheel end shaft section (5), and an output end shaft section (6). DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on this patent; in order to better illustrate the embodiments of the utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0027] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0028] In the description of the present invention, unless otherwise clearly specified and limited, if the term "connection" or the like appears to indicate the connection relationship between components, the term should be understood in a broad sense, for example, it 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 an indirect connection through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Embodiment 1:

[0030] like Figure 1-3 Specifically, a crankshaft includes a crankshaft main journal 1 and at least one connecting arm 4 connected to the crankshaft main journal 1, the connecting arm 4 is detachably connected to the crank 2 through a connecting rod assembly 3, and the connecting rod assembly 3 includes: a first connecting portion 32, the first connecting portion 32 is fixedly connected to the connecting arm 4, and the first connecting portion 32 has a positioning hole 322; a second connecting portion 33, the second connecting portion 33 is fixedly connected to the crank 2, the second connecting portion 33 has a positioning protrusion 332 that can be inserted into the positioning hole 322, and the positioning protrusion 332 is provided with a threaded hole; a bolt 31, the connecting arm 4 is provided with a mounting hole 41 that is connected to the positioning hole 322, and the bolt 31 passes through the mounting hole 41 and the positioning hole 322 in sequence and is threadedly connected to the positioning protrusion 332. The crankshaft is designed as an assembled structure formed by combining and connecting multiple parts, including a crankshaft main journal 1 and multiple cranks 2, wherein two cranks 2 are connected to both ends of the crankshaft main journal 1, and the crank 2 on the crankshaft main journal 1 is detachably connected to the other cranks 2 through a connecting arm 4 and a connecting rod assembly 3, and the connecting rod assembly 3 includes a first connecting portion 32 and a second connecting portion 33 respectively arranged at the end of the connecting arm 4 and the end of the crank 2, and the first connecting portion 32 and the second connecting portion 33 are connected by a bolt 31. When disassembling and replacing, the first connecting portion 32 and the second connecting portion 33 are disconnected by loosening the bolt 31, and the crank 2 or the connecting arm 4 can be replaced without replacing the entire crankshaft, thereby reducing maintenance costs.

[0031] In this embodiment, the first connection part 32 includes a circular first connection block 321 connected to the end of the connection arm 4, the positioning hole 322 is coaxially arranged with the first connection block 321, and a plurality of outwardly protruding pins 323 are arranged in a circular array on the edge of the first connection block 321. The second connection part 33 includes a circular second connection block 331 connected to the end of the crank 2, the positioning protrusion 332 and the second connection block 331 are coaxially arranged and protrude outward, and a plurality of plug holes 333 are arranged in a circular array on the edge of the second connection block 331. By adopting the above structure, the first connection block 321 is provided with a plug column 323, and the second connection block 331 is correspondingly provided with a plug hole 333. When the connection is made, the plug column 323 is inserted into the plug hole 333, which can enhance the torque resistance of the connection between the crank 2 and the connection arm 4.

[0032] In this embodiment, two cranks 2 are connected to both ends of the crankshaft main journal 1, the middle of the crank 2 is fixedly connected to the crankshaft main journal 1, and the ends of the crank 2 are connected through a connecting rod assembly 3 and a connecting arm 4. The connecting arm 4 is arranged in an inclined state, and the connecting rod assembly 3 is arranged parallel to the crankshaft main journal 1.

[0033] A crankshaft also includes a flywheel end shaft section 5 and an output end shaft section 6 arranged at both ends of the crankshaft. The flywheel end shaft section 5 and the output end shaft section 6 are connected to a crank 2 located at the end of the crankshaft.

[0034] Working principle: During installation, the first connection part 32 on the connecting arm 4 and the second connection part 33 on the crank 2 are leveled, specifically, the plug column 323 of the first connection part 32 is inserted into the plug hole 333 of the second connection part 33, and the positioning protrusion 332 of the second connection part 33 is extended into the positioning hole 322 of the first connection part 32, and then the bolt 31 is passed through the installation hole 41 and the positioning hole 322 in sequence to connect with the threaded hole of the positioning protrusion 332. During disassembly and replacement, the first connection part 32 and the second connection part 33 are disconnected by loosening the bolt 31, and the crank 2 or the connecting arm 4 can be replaced without replacing the entire crankshaft, thereby reducing maintenance costs.

[0035] The above are only embodiments of the utility model, and the circuits, electronic components and modules involved are all prior art, which can be fully implemented by those skilled in the art. It is needless to say that the content protected by this application does not involve improvements to software and methods. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. Ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the utility model before the application date or priority date, can obtain all the prior art in the field, and have the ability to apply conventional experimental means before the date. Ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent.

Claims

1. A crankshaft comprising a crankshaft main journal (1) and at least one connecting arm (4) connected to the crankshaft main journal (1), characterized in that: The connecting arm (4) is detachably connected to the crank (2) via a connecting rod assembly (3), and the connecting rod assembly (3) comprises: A first connecting portion (32), the first connecting portion (32) being fixedly connected to the connecting arm (4), the first connecting portion (32) having a positioning hole (322); A second connecting portion (33), the second connecting portion (33) being fixedly connected to the crank (2), the second connecting portion (33) having a positioning protrusion (332) which can be inserted into the positioning hole (322), and the positioning protrusion (332) having a threaded hole; The bolt (31) is provided on the connecting arm (4) with a mounting hole (41) connected to the positioning hole (322); the bolt (31) passes through the mounting hole (41) and the positioning hole (322) in sequence and is threadedly connected to the positioning protrusion (332).

2. A crankshaft according to claim 1, characterized in that: The first connecting portion (32) comprises a circular first connecting block (321) connected to the end of the connecting arm (4); the positioning hole (322) is coaxially arranged with the first connecting block (321); and a plurality of outwardly protruding plug posts (323) are arranged in a circular array on the edge of the first connecting block (321).

3. A crankshaft according to claim 2, characterized in that: The second connecting portion (33) comprises a circular second connecting block (331) connected to the end of the crank (2); the positioning protrusion (332) and the second connecting block (331) are coaxially arranged and protrude outward; and a plurality of sockets (333) are arranged in a circular array on the edge of the second connecting block (331).

4. A crankshaft according to claim 1, characterized in that: Two cranks (2) are connected to the two ends of the crankshaft main journal (1); the middle of the crank (2) is fixedly connected to the crankshaft main journal (1); and the ends of the crank (2) are connected via a connecting rod assembly (3) and a connecting arm (4).

5. A crankshaft according to claim 4, characterized in that: The connecting arm (4) is arranged in an inclined state, and the connecting rod assembly (3) is arranged parallel to the crankshaft main journal (1).

6. A crankshaft according to claim 1, characterized in that: It also includes a flywheel end shaft section (5) and an output end shaft section (6) arranged at both ends of the crankshaft.

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