Transmission crankshaft

Abstract

The utility model relates to a transmission crankshaft which is internally provided with an oil way, the transmission crankshaft comprises a crank and a connecting rod journal which are detachably connected, one end, facing the connecting rod journal, of the crank is provided with a sealing groove surrounding the outside of the oil way, and the end face, facing the crank, of the connecting rod journal is provided with a sealing ring corresponding to the sealing groove. And the sealing ring is inserted into the sealing groove to form annular sealing for the oil path. Through the arrangement of the sealing groove and the sealing ring, an annular sealing structure can be formed outside the oil way, so that the sealing performance of the joint of the sealing groove and the sealing ring is guaranteed, and the stability of oil pressure is guaranteed.

Description

Technical Field

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

[0002] The transmission crankshaft is an important transmission component in the engine, which can convert the reciprocating linear motion in the piston cavity into uninterrupted rotational motion, thereby driving the tire to move. The crankshaft is generally composed of a crankshaft journal, a crank and an eccentrically set connecting rod journal connected in sequence. A connecting rod journal and the cranks at both ends and the crankshaft journal can form a crank, which is the simplest crankshaft, generally used in single-cylinder engines.

[0003] With the development of science and technology, more powerful multi-cylinder engines have been developed, which are generally composed of multiple cranks axially connected in series. As the axial length increases, the probability of failure during operation also increases. In order to reduce costs, the existing technology improves the traditional integrated crankshaft so that the crankshaft can also be disassembled along the connecting rod journal.

[0004] For example, the Chinese patent with application number "201910693518.0" and name "A Crankshaft" can reduce the parts that need to be replaced when the crankshaft is damaged by disassembling the connecting rod journal, thereby achieving the purpose of reducing costs.

[0005] However, there is often an oil circuit inside the crankshaft, such as the oblique hole oil circuit of the Japanese Honda engine, which passes through at least one main shaft, one crank and one connecting rod journal in sequence through the oil circuit in one direction. Therefore, when the connecting rod journal changes from an integrated type to a detachable type, it will inevitably interfere with the oil circuit, causing oil leakage at the connection and affecting the oil pressure. Utility Model Content

[0006] The utility model aims at solving the problems of the prior art and provides a transmission crankshaft. The specific technical solution is as follows:

[0007] A transmission crankshaft has an oil circuit inside. The transmission crankshaft includes a crank and a connecting rod journal that are detachably connected. A sealing groove surrounding the oil circuit is provided at one end of the crank facing the connecting rod journal. A sealing ring corresponding to the sealing groove is provided on the end surface of the connecting rod journal facing the crank. In the installed state, the sealing ring is inserted into the sealing groove to form an annular seal for the oil circuit.

[0008] As a further technical solution of the utility model, the sealing groove is filled with lubricating oil, and in the installed state, the gap between the sealing groove and the sealing ring is filled with the lubricating oil.

[0009] As a further technical solution of the utility model, a flare is expanded at the entrance of the sealing groove, and the flare cooperates with the sealing groove to form a stepped structure, and an O-ring corresponding to the flare is ring-covered on the sealing ring. In the installed state, the O-ring is inserted into the flare to deform and seal the lubricating oil.

[0010] As a further technical solution of the utility model, the opening trajectory of the sealing groove matches the moving trajectory of the oil circuit.

[0011] The beneficial effects of the utility model are as follows:

[0012] (1) In the present application, by providing the sealing groove and the sealing ring, an annular sealing structure can be formed outside the oil circuit, thereby ensuring the sealing performance of the connection between the sealing groove and the sealing ring and ensuring the stability of the oil pressure.

[0013] (2) In the present application, the sealing medium is filled in the sealing groove at the same time, and the expansion and the O-ring are arranged so that the O-ring is deformed in the installed state to ensure the sealing of the medium and the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the structure of a crankshaft is shown;

[0015] Figure 2 The schematic diagram of the oil circuit structure is shown;

[0016] Figure 3 A schematic diagram of the structure of the crank and connecting rod journal in a disassembled state is shown;

[0017] Figure 4 The overall structural diagram of the connecting rod journal is shown;

[0018] Figure 5 Shows Figure 3 A is an enlarged structural diagram;

[0019] Figure 6 A locking method of the crank and the connecting rod journal is shown.

[0020] Legend:

[0021] 110, main shaft journal; 120, crank; 130, connecting rod journal; 200, oil circuit; 210, sealing groove; 220, sealing ring; 230, flaring; 240, O-ring. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution of the present utility model will be clearly and completely described below in conjunction with the embodiments.

[0023] Figure 1 A schematic diagram of the structure of a crankshaft is shown; Figure 2 The schematic diagram of the oil circuit structure is shown; Figure 1 and Figure 2 In the invention, a transmission crankshaft comprises a connecting rod journal 130, a crank 120 symmetrically connected to the two ends of the connecting rod journal 130, and two groups of main shaft journals 110 respectively connected to the ends of the two cranks 120 away from the connecting rod journal 130, wherein an oil circuit is provided inside the main shaft journal 110, and the oil circuit passes through at least one group of the main shaft journal 110, the crank 120 and the connecting rod journal 130 in one direction, and the oil circuit is in an inclined direction. When the connecting rod journal 130 is separated from the crank 120, the oil circuit is exposed, and when the crank 120 and the connecting rod journal 130 are in an installed state, the connection between the crank 120 and the connecting rod journal 130 will leak oil, affecting the oil pressure in the oil circuit. The above-mentioned are all existing There is technology, and the present application does not impose too many restrictions here; it should be noted that the oil circuit structure targeted by this embodiment is based on the oblique hole oil circuit of the Japanese Honda model engine, which mainly penetrates at least one group of main shaft journals 110, cranks 120 and connecting rod journals 130 through a drill shaft, saving the process required for oil circuit formation, but in some other embodiments, the oil circuit can also be other structures, such as some other oil circuits that can only penetrate the crank 120 and the connecting rod journal 130 in one oil circuit direction due to technical limitations, but essentially leakage will still occur at the connection between the crank 120 and the connecting rod journal 130, which is still a practical problem.

[0024] Figure 3 A schematic diagram of the structure of the crank 120 and the connecting rod journal 130 in a disassembled state is shown; Figure 4 shows a schematic diagram of the overall structure of the connecting rod journal 130; Figure 5 Shows Figure 3 A is an enlarged structural diagram; Figure 3-Figure 5In the embodiment, a sealing groove 210 surrounding the oil passage 200 is provided at one end of the crank 120 facing the connecting rod journal 130, and a sealing ring 220 corresponding to the sealing groove 210 is provided on the end surface of the connecting rod journal 130 facing the crank 120. The corresponding means that the size is matched. In the installed state, the sealing ring 220 is inserted into the sealing groove 210 to form an annular seal on the oil passage 200, so as to ensure the sealing effect of the crank 120 and the connecting rod journal 130 in the installed state after the detachable connection. Furthermore, the sealing groove 210 is filled with lubricating oil. In the installed state, due to the sealing groove 210 and the sealing ring 220, the sealing groove 210 and the sealing ring 220 are connected. 0 is a clearance fit, and there is inevitably a gap between the two. The gap between the two is filled with lubricating oil to fill the gap and increase the sealing performance. A flare 230 is expanded at the entrance of the sealing groove 210. The flare 230 cooperates with the sealing groove 210 to form a stepped structure, and an O-ring 240 corresponding to the flare 230 is sleeved on the sealing ring 220. In the installed state, the O-ring 240 is inserted into the flare 230 and deformed by extrusion to seal the lubricating oil filled in the sealing groove 210, further improving the sealing effect. The trajectory of the sealing groove 210 matches the trajectory of the oil circuit 200. Figure 5 As shown, the oil circuit 200 is designed to be inclined, and the sealing groove 210 is inclined to match the trajectory of the oil circuit 200. In addition, in the installed state, since the sealing rings 220 on the left and right sides of the connecting rod journal 130 are designed to be symmetrically inclined, they can limit the connecting rod journal 130 to avoid radial loosening of the connecting rod journal 130. However, in some other embodiments, when the trajectory of the oil circuit 200 is parallel to the axis, the sealing groove 210 is also changed accordingly to match the oil circuit 200.

[0025] Figure 6 A locking method of the crank 120 and the connecting rod journal 130 is shown; Figure 6 In the figure, a bolt passes through the crank 120 and is connected to the connecting rod journal 130, which can ensure the fixing effect of the crank 120 and the connecting rod journal 130 after being connected. It should be emphasized that the present application is an oil circuit protection structure designed after the crank 120 and the connecting rod journal 130 can be firmly connected. As for the fixing method between the crank 120 and the connecting rod journal 130, it does not belong to the protection scope of the present application, and the present application will not elaborate on it, and it should not be a limitation to the present application.

[0026] The above embodiments are only used to illustrate the technical solution of the present invention, but not to limit it.

Claims

1. A transmission crankshaft having an oil passage (200) inside, the transmission crankshaft comprising a detachably connected crank (120) and a connecting rod journal (130), characterized in that: A sealing groove (210) surrounding the outside of the oil circuit (200) is formed at one end of the crank (120) facing the connecting rod journal (130), and a sealing ring (220) corresponding to the sealing groove (210) is formed on the end surface of the connecting rod journal (130) facing the crank (120). In the installed state, the sealing ring (220) is inserted into the sealing groove (210) to form an annular seal for the oil circuit (200).

2. A transmission crankshaft according to claim 1, characterized in that: The sealing groove (210) is filled with a sealing medium, and in an installed state, the gap between the sealing groove (210) and the sealing ring (220) is filled with the sealing medium.

3. A transmission crankshaft according to claim 1 or 2, characterized in that: The entrance of the sealing groove (210) is expanded with a flared opening (230), the flared opening (230) cooperates with the sealing groove (210) to form a stepped structure, and an O-type sealing ring (240) corresponding to the flared opening (230) is sleeved on the sealing ring (220), and in the installed state, the O-type sealing ring (240) is inserted into the flared opening (230) to deform and seal the lubricating oil.

4. A transmission crankshaft according to claim 3, characterized in that: The opening trajectory of the sealing groove (210) matches the running trajectory of the oil circuit (200).

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