Oil way of engine balance shaft lubricating system

Abstract

An engine balance shaft lubricating system oil way belongs to the technical field of engines. Aiming at potential risks of abnormal sound during cold start of an engine, the engine balance shaft is supported by a bearing bush and lubricated by pressure, a gear is lubricated by immersion during cold start, oil holes are formed in an upper shell and a lower shell of a balance block cavity, damping is improved, the state of the balance shaft is improved, and the service life of the engine balance shaft is prolonged. And moreover, a hole is formed in the bottom, so that smooth lubrication is facilitated, and oil can be replaced cleanly. Oil ways are formed in the upper shell, the lower shell and the bearing bushes, and the four sets of bearing bush supporting balance shafts and the four sets of bearing bushes are assembled in bearing bush installation holes of the upper shell and the lower shell respectively. The lubricating system is compact in structure, and the internal space of each shaft system is ingeniously utilized. Forced lubrication is designed on each shaft system, lubricating oil can be conducted to each part, the potential risk of abnormal sound during cold start of the balance shaft is effectively reduced, and the lubricating effect is stable.

Description

Technical Field

[0001] The utility model belongs to the technical field of engines, and in particular relates to an oil circuit of a lubrication system of a balance shaft of an engine. Background Art

[0002] The balance shaft technology is a simple and very practical engine technology. It can effectively reduce the vibration of the whole vehicle, improve driving comfort, and make the engine work more smoothly and smoothly. When the engine is in operation, the movement speed of the piston is very fast and very uneven. When the piston is at the upper and lower dead points, its speed is zero, but the speed reaches the highest at the middle position of the upper and lower dead points. Since the piston makes repeated high-speed linear motion in the cylinder, it will inevitably generate a large inertial force on the piston, piston pin and connecting rod. Although the counterweight on the connecting rod can effectively balance these inertial forces, only part of the moving mass participates in the linear motion, and the other part participates in the rotation. Therefore, except for the upper and lower dead points, other inertial forces cannot be completely balanced, and the engine generates second-order vibration at this time. The balance shaft is an eccentric mass block with a rotation speed twice that of the crankshaft. When rotating, it offsets the second-order vibration of the engine caused by the reciprocating motion of the piston connecting rod mechanism. The reverse vibration force generated by the eccentric weight is used to reduce the vibration of the engine, so that the engine can obtain a good balance effect.

[0003] If the balance shaft is poorly lubricated during cold start, it will cause abnormal noise in the gears, erosion or failure of the balance shaft bearings or bushings, etc. In order to solve the above problems and improve the balancing effect of the balance shaft, it is necessary to develop a balance shaft lubrication system with a stable lubrication structure and good performance. Utility Model Content

[0004] The utility model aims at the potential risk of abnormal noise during cold start of the engine and further provides an oil circuit for the lubrication system of the engine balance shaft. The engine balance shaft adopts bearing support and pressure lubrication. The gears are immersed in lubrication during cold start. The balance block cavity is provided with oil holes on the upper shell and the lower shell to increase damping, improve the state of the balance shaft, and thus improve the problem of abnormal noise during cold start. The bottom opening is more conducive to smooth lubrication and clean oil change.

[0005] The technical solution adopted by the utility model is:

[0006] An oil circuit for a lubrication system of an engine balance shaft, wherein the oil circuit is opened on an upper housing, a lower housing and bearings, and the balance shaft is supported by the bearings. The oil circuit includes a single-side oil passage arranged on the upper housing and the lower housing, and the oil passage passes through bolt holes to reach each bearing. There are four groups of bearings, which are respectively assembled at the bearing mounting holes of the upper housing and the lower housing.

[0007] Compared with the prior art, the utility model has the following beneficial effects:

[0008] The lubrication system of this utility model has a compact structure and makes clever use of the internal space of each shaft system. Forced lubrication is designed on each shaft system to transmit the lubricating oil to each part, effectively reducing the potential risk of abnormal noise during cold start of the balance shaft, and the lubrication effect is stable.

[0009] The utility model adopts bearing support, pressure lubrication, and immersion lubrication of gears during cold start, which enhances the lubrication effect without affecting the overall rigidity and avoids the potential risk of abnormal noise during cold start. The balance block cavity is equipped with oil holes on both the upper and lower shells to increase damping, improve the state of the balance shaft, and thus improve the problem of abnormal noise during cold start. The bottom opening is more conducive to smooth lubrication and clean oil change. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the oil circuit of the utility model;

[0011] Figure 2 It is a schematic diagram of the structure of the balance shaft with housing;

[0012] Figure 3 It is a schematic diagram of the upper and lower shells and the bearing structure;

[0013] Figure 4 It is a schematic diagram of the oil circuit distributed on the upper housing of the utility model;

[0014] Figure 5 It is a schematic diagram of the oil circuit distributed in the lower housing of the utility model;

[0015] Figure 6 It is a schematic diagram of the oil circuit on the bearing bush of the utility model;

[0016] Among them: 1. upper housing; 2. lower housing; 3. balance shaft; 4. balance shaft gear; 5. bearing; 101. oil inlet hole; 102. main oil channel; 103. upper housing bearing oil channel; 104. upper housing gear oil hole; 105. upper housing balance block oil hole; 201. lower housing bearing oil channel; 202. lower housing balance block oil hole; 203. lower housing gear oil hole; 204. timing pin hole; 501. bearing oil hole; 502. bearing oil groove; 503. positioning block. DETAILED DESCRIPTION

[0017] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0018] like Figure 1 to Figure 6As shown, the utility model provides an oil circuit of an engine balance shaft lubrication system, wherein the oil circuit is opened on an upper housing 1, a lower housing 2 and a bearing 5, and a balance shaft 3 is supported by the bearing 5, and includes a single-side oil passage arranged on the upper housing 1 and the lower housing 2, and the oil passage passes through bolt holes to reach each bearing 5. There are four groups of bearings 5, which are respectively assembled at the bearing mounting holes of the upper housing 1 and the lower housing 2.

[0019] The upper housing 1 has an oil inlet hole 101, a main oil passage 102, an upper housing bearing oil passage 103, an upper housing gear oil hole 104 and an upper housing balance block oil hole 105; see Figure 4 .

[0020] The main oil channel 102 is opened on one side of the upper shell 1, and the oil inlet hole 101 is on the same side as the main oil channel 102, which is used to connect the engine oil channel and the main oil channel 102. The main oil channel 102 is connected to the lower shell bearing oil channel 201 of the lower shell 2. The four upper shell bearing oil channels 103 are respectively arranged at the corresponding positions of the bearing 5, which are used to connect the lower shell bearing oil channel 201 and the bearing oil hole 501. The upper shell gear oil hole 104 is arranged at the gear cavity of the upper shell 1, and the upper shell balance block oil hole 105 is arranged at the balance cavity of the upper shell 1.

[0021] An oil inlet hole 101 is provided on the right side of the upper shell 1. The lubricating oil enters the oil inlet hole 101 of the upper shell 1 of the balance shaft through the engine oil channel, and is pressure-lubricated to each balance shaft along the main oil channel 102, the lower shell bearing oil channel 201, the upper shell bearing oil channel 103, the bearing oil hole 501, and the bearing oil groove 502 in sequence.

[0022] The lower housing 2 has a lower housing bearing oil passage 201, a lower housing balance block oil hole 202, a lower housing gear oil hole 203 and a timing pin hole 204. Figure 5 .

[0023] One end of the two lower housing bearing oil passages 201 is respectively arranged at the two ends of the main oil passage 102, and the other ends of the two lower housing bearing oil passages 201 are respectively connected to the upper housing bearing oil passage 103 through bolt holes. The two lower housing balance block oil holes 202 are arranged at the lower end of the balance block cavity of the lower housing 2.

[0024] When the engine is stationary, the oil enters the cavity through the balance block oil hole 202 of the lower housing. When the engine is cold-started, the oil in the balance block cavity increases the balance block damping and reduces vibration. When the balance block runs smoothly, the oil level in the engine oil pan drops, and the oil in the balance block cavity is thrown out through the balance block oil hole 105 of the upper housing and the balance block oil hole 202 of the lower housing due to centrifugal force.

[0025] The lower housing gear oil hole 203 is arranged at the lower end of the gear cavity of the lower housing 2. The gear cavities of the upper housing 1 and the lower housing 2 are used to install the balance shaft gear 4.

[0026] When the engine is stationary, the oil enters the gear cavity through the lower housing gear oil hole 203, so that the balance shaft gear 4 is in an immersed lubricated state. When the engine is cold started, the balance shaft gear 4 is fully lubricated to avoid the whistling of the balance shaft gear 4 during cold start. When the engine is running smoothly, the splashing oil enters the gear cavity through the upper housing gear oil hole 104 for lubrication.

[0027] The bearing 5 has a bearing oil hole 501 and a bearing oil groove 502. The bearing oil groove 502 is arranged around the inner wall of the bearing 5. The bearing oil hole 501 passes through the bearing 5, connecting the bearing oil groove 502 and the bearing oil passage 103 of the upper housing. A positioning block 503 is embedded in the side wall of the bearing 5. Figure 6 .

[0028] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. An oil circuit of an engine balance shaft lubrication system, characterized in that: The oil circuit is opened on the upper housing (1), the lower housing (2) and the bearing (5), and the balance shaft (3) is supported by the bearing (5). It includes a single-side oil passage arranged on the upper housing (1) and the lower housing (2), and the oil passes through the bolt holes through the oil passage to reach each bearing (5). There are four groups of bearings (5) respectively assembled at the bearing mounting holes of the upper housing (1) and the lower housing (2).

2. The oil circuit of the engine balance shaft lubrication system according to claim 1, characterized in that: The upper housing (1) is provided with an oil inlet hole (101), a main oil passage (102), an upper housing bearing oil passage (103), an upper housing gear oil hole (104) and an upper housing balance block oil hole (105); The main oil passage (102) is opened on one side of the upper housing (1); the oil inlet hole (101) is on the same side as the main oil passage (102) and is used to connect the engine oil passage with the main oil passage (102); the main oil passage (102) is connected to the lower housing bearing oil passage (201) of the lower housing (2); the four upper housing bearing oil passages (103) are respectively arranged at corresponding positions of the bearing (5) and are used to connect the lower housing bearing oil passage (201) and the bearing oil hole (501); the upper housing gear oil hole (104) is arranged at the gear cavity of the upper housing (1); and the upper housing balance block oil hole (105) is arranged at the balance cavity of the upper housing (1).

3. The oil circuit of an engine balance shaft lubrication system according to claim 1, characterized in that: The lower housing (2) is provided with a lower housing bearing oil passage (201), a lower housing balance block oil hole (202), a lower housing gear oil hole (203) and a timing pin hole (204). One end of the two lower housing bearing oil passages (201) is respectively arranged at the two ends of the main oil passage (102), and the other end of the two lower housing bearing oil passages (201) is connected to the upper housing bearing oil passage (103) through bolt holes. The two lower housing balance block oil holes (202) are arranged at the lower end of the balance block cavity of the lower housing (2). The lower housing gear oil hole (203) is arranged at the lower end of the gear cavity of the lower housing (2).

4. The oil circuit of the engine balance shaft lubrication system according to claim 1, characterized in that: The bearing (5) is provided with a bearing oil hole (501) and a bearing oil groove (502); the bearing oil groove (502) is arranged around the inner wall of the bearing (5); the bearing oil hole (501) passes through the bearing (5) and connects the bearing oil groove (502) with the bearing oil passage (103) of the upper housing.

5. The oil circuit of the lubrication system of the engine balance shaft according to claim 4, characterized in that: A positioning block (503) is embedded in the side wall of the bearing bush (5).

Images