CN222376573U - Oil circuit of lubrication system of engine balance shaft - Google Patents

Abstract

An oil circuit for an engine balance shaft lubrication system belongs to the field of engine technology. Aiming at the potential risk of abnormal noise during cold start of the engine, an oil circuit for an engine balance shaft lubrication system is provided. The engine balance shaft is supported by bearings and pressure lubricated. During cold start, the gears are immersed in lubrication. The balance block cavity is provided with oil holes in 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. The oil circuit is opened on the upper shell, the lower shell and the bearings. The balance shaft is supported by bearings. There are four groups of bearings, which are respectively assembled at the bearing mounting holes of the upper shell and the lower shell. The lubrication system of the utility model has a compact structure and cleverly utilizes the internal space of each shaft system. Forced lubrication is designed on each shaft system, which can 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.

Description

Oil circuit of engine balance shaft lubricating system

Technical Field

The utility model belongs to the technical field of engines, and particularly relates to an oil way of an engine balance shaft lubricating system.

Background

The balance shaft technology is an engine technology which is simple in structure and very practical, can effectively slow down the vibration of the whole vehicle, improves the driving comfort, and ensures that the engine works more stably and smoothly. When the engine is in operation, the piston moves very rapidly and at a very uneven rate. When the piston is at the top and bottom dead center positions, the speed is zero, but the speed at the middle position of the top and bottom dead center positions is highest. Because the piston makes repeated high-speed linear motion in the cylinder, a large inertial force is necessarily generated on the piston, the piston pin and the connecting rod. While the counterweight on the connecting rod can effectively balance these inertial forces, only a portion of the moving mass participates in linear motion and another portion participates in rotation. Therefore, other inertial forces except the top dead center and the bottom dead center cannot reach the balanced state completely, and the engine generates second-order vibration. The balance shaft is an eccentric mass block with the rotating speed being 2 times of that of the crankshaft, and the second-order vibration of the engine caused by the reciprocating motion of the piston-connecting rod mechanism is counteracted when the balance shaft rotates. The vibration of the engine is reduced by the reverse vibration force generated by the eccentric weight, so that the engine obtains a good balance effect.

If lubrication is poor during cold start of the balance shaft, abnormal noise of the gear can be caused, and the balance shaft bearing or the bearing bush is ablated or fails. In order to solve the above problems and improve the balance effect of the balance shaft, a balance shaft lubrication system with stable and good lubrication structure needs to be developed.

Disclosure of utility model

Aiming at the potential risk of abnormal sound during cold start of an engine, the utility model further provides an oil way of an engine balance shaft lubricating system, an engine balance shaft adopts bearing bush support and pressure lubrication, gears are immersed and lubricated during cold start, oil holes are distributed in an upper shell and a lower shell of a balance block cavity, damping is improved, the state of the balance shaft is improved, the abnormal sound problem during cold start is further improved, and the bottom hole is more beneficial to smooth lubrication and clean oil change.

The technical scheme adopted by the utility model is as follows:

The utility model provides an engine balance shaft lubricating system oil circuit, the oil circuit is offered on last casing, lower casing and axle bush, by the axle bush prop the balance shaft, including setting up the unilateral oil duct at last casing and lower casing, pass the bolt hole through the oil duct and reach on each axle bush, four groups are altogether assembled respectively in the axle bush mounting hole department of last casing and lower casing.

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

The lubricating system disclosed by the utility model is compact in structure and skillfully utilizes the internal space of each shafting. The forced lubrication is designed on each shaft system, so that the 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 lubrication effect is stable

The utility model adopts the bearing bush support, the pressure lubrication and the gear as the immersion lubrication during the cold start, thus enhancing the lubrication effect and avoiding the potential risk of abnormal sound during the cold start under the condition of not influencing the integral rigidity. The balance block cavity is provided with oil holes in the upper shell and the lower shell, so that damping is improved, the balance shaft state is improved, the abnormal sound problem during cold start is further improved, and the bottom opening is more beneficial to smooth lubrication and clean oil change.

Drawings

FIG. 1 is a schematic view of an oil circuit according to the present utility model;

FIG. 2 is a schematic diagram of a balance shaft belt housing;

FIG. 3 is a schematic view of the upper and lower shells and bearing shell structure;

FIG. 4 is a schematic view of the oil passages of the present utility model distributed in the upper housing;

FIG. 5 is a schematic view of the oil passages of the present utility model distributed in the lower housing;

FIG. 6 is a schematic view of an oil path on a bearing shell according to the present utility model;

wherein 1, an upper shell; 2, a lower shell, 3, a balance shaft, 4, a balance shaft gear, 5, a bearing bush, 101, an oil inlet hole, 102, a main oil duct, 103, an upper shell bearing bush oil duct, 104, an upper shell gear oil hole, 105, an upper shell balance block oil hole, 201, a lower shell bearing bush oil duct, 202, a lower shell balance block oil hole, 203, a lower shell gear oil hole, 204, a timing pin hole, 501, a bearing bush oil hole, 502, a bearing bush oil groove, 503 and a positioning block.

Detailed Description

For a better understanding of the objects, structures and functions of the present utility model, reference should be made to the following detailed description of the utility model with reference to the accompanying drawings.

As shown in fig. 1 to 6, the utility model provides an oil circuit of an engine balance shaft lubricating system, the oil circuit is arranged on an upper shell 1, a lower shell 2 and bearing bushes 5, the bearing bushes 5 support a balance shaft 3, the engine balance shaft lubricating system comprises single-side oil channels arranged on the upper shell 1 and the lower shell 2, the single-side oil channels penetrate through bolt holes through the oil channels to reach each bearing bush 5, and the bearing bushes 5 are respectively assembled at bearing bush mounting holes of the upper shell 1 and the lower shell 2 in four groups.

The upper shell 1 is provided with an oil inlet hole 101, a main oil duct 102, an upper shell bearing bush oil duct 103, an upper shell gear oil hole 104 and an upper shell balance weight oil hole 105, as shown in fig. 4.

The main oil duct 102 is arranged on one side of the upper casing 1, the oil inlet hole 101 is arranged on the same side as the main oil duct 102 and is used for communicating an engine oil duct with the main oil duct 102, the main oil duct 102 is communicated with a lower casing bearing bush oil duct 201 of the lower casing 2, the four upper casing bearing bush oil ducts 103 are respectively arranged at corresponding positions of the bearing bushes 5 and are used for communicating the lower casing bearing bush oil duct 201 and the bearing bush oil holes 501, the upper casing gear oil holes 104 are arranged at a gear cavity of the upper casing 1, and the upper casing balance block oil holes 105 are arranged at a balance cavity of the upper casing 1.

The right side of the upper shell 1 is provided with an oil inlet hole 101, lubricating oil enters the oil inlet hole 101 of the upper shell 1 of the balance shaft through an engine oil passage, and pressure lubrication is carried out on each balance shaft along the main oil passage 102, the lower shell bearing oil passage 201, the upper shell bearing oil passage 103, the bearing oil hole 501 and the bearing oil groove 502 in sequence.

The lower housing 2 is provided with a lower housing bush oil passage 201, a lower housing balancing weight oil hole 202, a lower housing gear oil hole 203 and a timing pin hole 204, as shown in fig. 5.

One end of each lower shell bearing bush oil duct 201 is correspondingly arranged at two ends of the main oil duct 102, the other end of each lower shell bearing bush oil duct 201 is communicated with the corresponding upper shell bearing bush oil duct 103 through a bolt hole, each lower shell balancing block oil hole 202 is arranged at the lower end of a balancing block cavity of the lower shell 2,

When the engine is at rest, oil enters the cavity through the lower shell balance weight oil hole 202, and when the engine is started in a cold mode, the oil increases balance weight damping in the balance weight cavity, and vibration is reduced. When the balance weight runs stably, the oil level of the oil collecting disc of the engine descends, and oil in the cavity of the balance weight can be thrown out through the oil hole 105 of the upper shell and the oil hole 202 of the lower shell along with centrifugal force.

The lower housing gear oil hole 203 is provided at the lower end of the gear cavity of the lower housing 2. The gear cavities of the upper and lower housings 1 and 2 are used for mounting balance shaft gears 4.

When the engine is at rest, oil enters the gear cavity through the lower shell gear oil hole 203, so that the balance shaft gear 4 is in a dipping lubrication state, and when the engine is cold started, the balance shaft gear 4 is sufficiently lubricated, and the generation of squeal of the balance shaft gear 4 during cold start is avoided. When the engine runs stably, splash oil enters the gear cavity through the upper housing gear oil hole 104 for lubrication.

The bearing bush 5 is provided with a bearing bush oil hole 501 and a bearing bush oil groove 502, the bearing bush oil groove 502 is arranged around the inner wall of the bearing bush 5, and the bearing bush oil hole 501 penetrates through the bearing bush 5 and connects the bearing bush oil groove 502 with the upper shell bearing bush oil duct 103. A positioning block 503 is embedded in the side wall of the bearing bush 5. See fig. 6.

It will be understood that the utility model has been described in terms of several embodiments, and that various changes and equivalents may be made to these features and embodiments by those skilled in the art without departing from the spirit and scope of the utility model. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the utility model without departing from the essential scope thereof. Therefore, it is intended that the utility model not be limited to the particular embodiment disclosed, but that the utility model will include all embodiments falling within the scope of the appended claims.

Claims (5)

1. The engine balance shaft lubricating system oil way is characterized in that the oil way is arranged on an upper shell (1), a lower shell (2) and bearing bushes (5), the bearing bushes (5) support the balance shaft (3), the engine balance shaft lubricating system oil way comprises single-side oil channels arranged on the upper shell (1) and the lower shell (2), the single-side oil channels penetrate through bolt holes through the oil channels to reach the bearing bushes (5), and the bearing bushes (5) are assembled at bearing bush mounting holes of the upper shell (1) and the lower shell (2) respectively.

2. The oil way of the engine balance shaft lubricating system according to claim 1, wherein the upper shell (1) is provided with an oil inlet hole (101), a main oil duct (102), an upper shell bearing bush oil duct (103), an upper shell gear oil hole (104) and an upper shell balance block oil hole (105);

The oil inlet hole (101) is formed in one side of the upper shell (1) and is on the same side as the main oil duct (102) and is used for communicating an engine oil duct and the main oil duct (102), the main oil duct (102) is communicated with a lower shell bearing bush oil duct (201) of the lower shell (2), the four upper shell bearing bush oil ducts (103) are respectively arranged at corresponding positions of the bearing bushes (5) and are used for communicating the lower shell bearing bush oil duct (201) and the bearing bush oil hole (501), the upper shell gear oil hole (104) is formed in a gear cavity of the upper shell (1), and the upper shell balance weight oil hole (105) is formed in a balance cavity of the upper shell (1).

3. The oil circuit of the engine balance shaft lubricating system according to claim 1, wherein the lower housing (2) is provided with a lower housing bearing bush 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 each lower shell bearing bush oil duct (201) is correspondingly arranged at two ends of the main oil duct (102), the other end of each lower shell bearing bush oil duct (201) is communicated with the corresponding upper shell bearing bush oil duct (103) through a bolt hole, each lower shell balancing block oil hole (202) is arranged at the lower end of a balancing block cavity of the lower shell (2),

The lower shell gear oil hole (203) is arranged at the lower end of the gear cavity of the lower shell (2).

4. The oil way of the engine balance shaft lubricating system according to claim 1, wherein the bearing bush (5) is provided with a bearing bush oil hole (501) and a bearing bush oil groove (502), the bearing bush oil groove (502) is arranged around the inner wall of the bearing bush (5), the bearing bush oil hole (501) penetrates through the bearing bush (5), and the bearing bush oil groove (502) is connected with the upper shell bearing bush oil channel (103).

5. The oil circuit of the engine balance shaft lubricating system according to claim 4, wherein the side wall of the bearing bush (5) is embedded with a positioning block (503).