CN208006118U - A kind of pressure injection assembling die of automobile BSG engine crankshaft damper pulleys - Google Patents

Abstract

An injection combination mold for the crankshaft damping pulley of an automobile BSG engine, including two parts: the crankshaft damping pulley and the injection combination mold. The crankshaft damping pulley is composed of a hub, rubber and a pulley. It is composed of a guide block and a lower template. The hub part is provided with four mounting bolt holes D and a positioning pin hole C for fixing and positioning on the timing belt pulley. The lower template is provided with stepped grooves. The side of the middle boss of the lower template has a There is a draft angle, and the hub and the pulley are arranged on the lower template, and the rubber is installed into the hub and the pulley through the outer guide block and the inner guide block. The production of the crankshaft damping pulley of the utility model can save costs in mass production, save manpower and material costs, reduce its torsional moment and bending moment to the crankshaft system, reduce engine vibration, and increase the service life of the crankshaft, which is applied to automobiles in the field of engine technology.

Description

A pressure injection combination mold for crankshaft damping pulley of automobile BSG engine

technical field

The utility model relates to a press-injection combination mold for a crankshaft damping belt pulley of an automobile BSG engine in the technical field of automobile BSG engines.

Background technique

BSG (Belt-driven Starter Generator) is a belt-driven starter generator. When the engine is working, the periodically changing torque of each cylinder makes the rotation speed of each crank throw change periodically, that is, the torsional vibration of the crankshaft. In order to prevent the resonance phenomenon and reduce the vibration noise during the normal operation of the engine, it is necessary to install the crankshaft damping pulley. At present, the production method of the crankshaft damping pulley is often the ordinary vulcanization bonding type, that is, the rubber is softened and then vulcanized. The pulley and the center hub are used as a mold, and the rubber after high temperature vulcanization is injected into it and two flat templates are pressed on both sides. until cooled. Although this method can save the mold when the rubber is cooled alone, but due to the poor thermal conductivity of the rubber itself, it takes a long time for the heat to dissipate from the pulley and the hub to the air, which will have an adverse effect on the two itself, and will also affect the overall production cycle of the part. . In addition, this process has high requirements on the surface roughness of the pulley and the hub. In order to prevent defects in the bonding between the rubber and the hub and affect the transmission, it is often necessary to install a smooth steel bushing on the outside of the hub, which reduces the production cost. A substantial increase. In the prior art, the outer groove of the pulley is connected to the BSG motor, and the inner groove is connected to other accessories.

With the continuous reduction of energy storage capacity, energy conservation and emission reduction has become an issue that cannot be ignored in today's development. BSG is a mild hybrid technology, and the fuel-saving effect of the actual vehicle test is about 5%, which is conducive to the conservation of vehicle fuel and environmental protection. Due to the spatial arrangement of the front-end auxiliary gear train of the engine, the pulley is often designed as a multi-PK structure. The existing installation method of aligning the BSG motor with the outer tank will make the force application point far away from the center of the base point, which will increase the torsional deformation and bending deformation of the crankshaft, which is not conducive to the service life of the crankshaft system. Therefore research and develop a kind of pressure-injection composite mold of crankshaft damping belt pulley of novel automobile BSG engine and be the problem waiting to be solved urgently always.

Utility model content

The purpose of this utility model is to provide a pressure-injection combined mold for the crankshaft damping pulley of an automobile BSG engine. The utility model is made by a new technology, which reduces the cost of parts and the production cycle, and at the same time alleviates the excessive force on the crankshaft system and unstable dynamic balance. status.

The purpose of this utility model is achieved like this: a kind of pressure injection combination mold of automobile BSG engine crankshaft damping belt pulley, comprises two parts of crankshaft damping belt pulley and pressure injection combination mold, crankshaft damping belt pulley is made up of wheel hub, rubber, belt pulley, The injection combination mold is composed of outer guide block, inner guide block and lower template. The hub part is provided with four mounting bolt holes D and one positioning pin hole C for fixing and positioning on the timing belt pulley. The lower template is provided with a step The side of the boss in the middle of the lower formwork has a draft slope, the hub and the pulley are set on the lower formwork, the inner guide block is set on the hub, the outer guide block is set on the pulley, and the rubber is passed through the outer guide block and the inner guide block. The block fits into the hub and pulley.

Main point of the present utility model is its structure. The principle of its structural design is to align the BSG motor with the inner groove of the crankshaft damping pulley. Since the BSG motor is a heavy-duty device, if it is placed in an outer groove with a larger radius, the torsional moment and bending moment of the crankshaft system will increase, the engine vibration will increase, and the noise will be louder. If it is changed to an inner groove with a smaller radius and closer to the center of the crankshaft system, the torsional moment and bending moment will be reduced accordingly, which helps to improve the service life of the crankshaft and the damping pulley. To optimize the structure of this situation, the BSG motor starts to use the inner groove drive with a smaller radius. Therefore, the inner groove is widened and the outer groove is narrowed. Its production method is to vulcanize the rubber on the rubber forming mold, and then press the rubber forming body between the pulley and the hub by using the injection combination mold. Compared with the traditional vulcanization bonding method, the press-in type has an independent rubber molding mold, which does not need to indirectly heat the rubber liquid by heating the pulley and the hub, which simplifies the processing process. At the same time, the press-in type cancels the steel shaft sleeve structure, which reduces the cost in mass production. After the crankshaft shock-absorbing pulley has been tested and assessed, its natural vibration frequency changes from -5% to 20%, the pulling load of the press-fit part is 16.2KN, and the rubber residual rate on the bonding surface is ≥50 when the rubber breaks and the bonding breaks. %, other parameters also meet the requirements of the complete engine test.

Compared with the prior art, an injection combined mold for the crankshaft damping pulley of an automobile BSG engine has a production method of the crankshaft damping pulley, which is changed from the traditional ordinary vulcanization and bonding type to the technology of heating vulcanization and press-in molding in advance, eliminating the need for Steel bushings can save costs in mass production. At the same time, the method of preheating the rubber material in advance and then vulcanizing and injecting pressure also greatly shortens the part production cycle, saves manpower and material costs, and moves the BSG motor belt to the inner tank. It also shortens the distance between the force point and the base point, reduces its torsional moment and bending moment to the crankshaft system, reduces engine vibration, and improves the service life of the crankshaft. It will be widely used in the field of automotive engine technology.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is described in detail.

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a structural schematic diagram of the crankshaft damping pulley part of the utility model.

Fig. 3 is a sectional view rotated along line A-A of Fig. 2 .

Fig. 4 is a structural schematic diagram of the crankshaft damping pulley in the prior art.

Detailed ways

With reference to the accompanying drawings, an injection combination mold for a crankshaft damping pulley of an automobile BSG engine includes two parts, a crankshaft damping pulley 1 and an injection combination mold 2. The crankshaft damping pulley 1 consists of a hub 1-1, rubber 1-2, The belt pulley 1-3 is composed, the injection combined mold 2 is composed of the outer guide block 2-1, the inner guide block 2-2, and the lower template 2-3, and the wheel hub 1-1 is provided with a part for fixing and positioning on the timing tooth pulley Four mounting bolt holes D and one positioning pin hole C, the lower template 2-3 is provided with a stepped groove, the side of the middle boss of the lower template 2-3 has a draft slope, and the hub 1 is set on the lower template 2-3 -1 and belt pulley 1-3, inner guide block 2-2 is set on wheel hub 1-1, outer guide block 2-1 is set on belt pulley 1-3, rubber 1-2 is passed through outer guide block 2-1, Inner guide block 2-2 is packed in the wheel hub 1-1 and the belt pulley 1-3.

The structural design principle of the pressure injection combined mold of the crankshaft damping pulley of a kind of automobile BSG engine is that the inner groove of the BSG motor and the crankshaft damping pulley is collinear. Since the BSG motor is a heavy-duty device, if it is placed in an outer groove with a larger radius, the torsional moment and bending moment of the crankshaft system will increase, the engine vibration will increase, and the noise will be louder. If it is changed to an inner groove with a smaller radius and closer to the center of the crankshaft system, the torsional moment and bending moment will be reduced accordingly, which helps to improve the service life of the crankshaft and the damping pulley. To optimize the structure of this situation, the BSG motor starts to use the inner groove drive with a smaller radius. Therefore, the inner groove is widened and the outer groove is narrowed. Its production method is to vulcanize the rubber on the rubber forming mold, and then press the rubber forming body between the pulley and the hub by using the injection combination mold. Compared with the traditional vulcanization bonding method, the press-in type has an independent rubber molding mold, and does not need to indirectly heat the rubber liquid by heating the pulley and the hub, which simplifies the processing process. At the same time, the press-in type cancels the steel shaft sleeve structure, which reduces the cost in mass production. After the crankshaft shock-absorbing pulley has been tested and assessed, its natural vibration frequency changes from -5% to 20%, the pulling load of the press-fit part is 16.2KN, and the rubber residual rate on the bonding surface is ≥50 when the rubber breaks and the bonding breaks. %, other parameters also meet the requirements of the complete engine test.

Further describe the utility model according to embodiment below:

In the utility model, the BSG motor is collinear with the inner groove with a smaller radius. Since the BSG motor is a heavy-duty device, if it is changed to be in line with the inner groove with a smaller radius and closer to the center of the crankshaft system, the torsional moment and bending moment will be reduced accordingly, which will help to improve the service life of the crankshaft and the damping pulley. The utility model optimizes the structure of this situation, and changes the original structure of wide outer groove and narrow inner groove into wide inner groove and narrow outer groove, and the BSG motor is driven by the inner groove. At the same time, as shown in Figures 1 and 2, the crankshaft damping pulley of the present invention also includes a timing mark B located on the edge of the inner groove, a positioning pin hole C located at the wheel hub 1-1, a mounting bolt hole D, and a crankshaft mounting hole E , Balance adjustment hole G. The crankshaft damping pulley is fitted on the crankshaft through the crankshaft mounting hole E, and its position on the timing belt pulley is determined through the positioning pin hole C, and fixed with bolts through four evenly distributed mounting bolt holes D. After its assembly is completed, turn it slowly so that the timing mark B is aligned with the timing line on the front cover of the timing belt, and the engine timing adjustment is completed. The timing mark B makes the engine adjustment timing visualized, which is convenient for quantitative adjustment of valve timing. In order to make the crankshaft damping pulley meet the dynamic balance requirements, it is necessary to drill some balance adjustment holes G on the pulley.

In addition, compared with the vulcanized bonding method used in the production of traditional pulleys, the utility model adopts press-in production. The press-in type has an independent rubber molding mold, which needs to be completed in advance when making the crankshaft damping pulley. The inside of the mold has resistance wires and thermocouples for heating and melting rubber and vulcanization reaction. During production, the rubber material and additives are poured into the rubber molding mold, mixed and heated to a molten state (about 190°C). Then slowly heat up to 220°C for vulcanization reaction. After cooling and forming, the injection combination mold of the utility model is used for assembly.

As shown in FIG. 3 , the combined injection mold includes an outer guide block A for pressing the pulley, an inner guide block 2-2 for pressing the hub, and a lower template 2-3. The lower template 2-3 has both the outer ring positioning function for the pulley positioning and the inner ring positioning function for the wheel hub positioning. There are stepped grooves on it, and the depth of each groove is close to the step of the pulley, so that the crankshaft can be placed smoothly for shock absorption. pulley. Simultaneously, the side of the boss in the middle of the lower template 2-3 has a draft slope, and its slope value is consistent with the inner side of the wheel hub to fix the wheel hub. The gap value between the inner and outer guide blocks is slightly larger than the reserved gap value of the rubber on the crankshaft damping pulley, so that the rubber can be pressed in with an interference fit. When assembling the crankshaft damping pulley, set the wheel hub 1-1 and the pulley 1-3 on the lower template 2-3, press the wheel hub 1-1 with the inner guide block 2-2, and press the pulley 1 with the outer guide block 2-1 -3. Apply a rated force to the rubber along the F direction in Figure 1, so that the rubber 1-2 is press-fitted between the hub 1-1 and the pulley 1-3 through the gap between the inner and outer guide blocks until it is completely filled without gaps. This production method is easy to operate, avoids the process of using the pulley and the hub as molds in the vulcanization bonding method, and requires additional heating for the pulley and the hub, reduces vulcanization molding time, saves energy consumption and production costs; saves the steel bushing , The net profit is very considerable in mass production; since the defective products can be repaired or eliminated after rubber molding, it is easier to produce high-quality products with stable dimensions and excellent physical and mechanical properties.

Claims (1)

1. An injection combination mold for the crankshaft damping pulley of an automobile BSG engine, including two parts: the crankshaft damping pulley and the injection combination mold. It consists of an outer guide block, an inner guide block, and a lower template. The hub part is provided with four mounting bolt holes D and one positioning pin hole C for fixing and positioning on the timing belt pulley. The lower template is provided with a stepped groove. The lower template The side of the middle boss has a draft angle, set the wheel hub and pulley on the lower template, set the inner guide block on the wheel hub, set the outer guide block on the pulley, and install the rubber through the outer guide block and the inner guide block to the wheel hub and pulley inside.