CN201392272Y - Accurate positioning system for cylinder head and simulated cylinder liner for airway test bench - Google Patents

Abstract

The utility model belongs to the detecting technology for performance parameters of internal-combustion engines, and relates to a system for accurately positioning a testing cylinder cover and a simulation cylinder sleeve of an air passage testing board. The top part of a driving cylinder is in threaded connection with a top block; the central part of a supporting plate is hollowed, so as to allow the top part of the driving cylinder to pass through the supporting plate; a connecting plate is hung on the top block; a guide column is welded on the lower end surface of the connecting plate, and a bracket is welded on the upper end surface of the connecting plate; supporting shafts are assembled on the bracket; a linear bearing is assembled in a hole passage on the supporting plate; rollers are sleeved with the supporting shafts; a plurality of supporting shafts and a plurality of rollers form a roller way; a bearing plate can roll on the roller way; and all components driven by the pressure in the driving cylinder to be connected with the end surfaces of the connecting plate into a whole move up and down along the linear bearing. The utility model has the characteristics that the system is suitable for testing the parameters of the air passages of various engines, thereby accurately positioning and rapidly mounting the cylinder cover; and the time is saved, and the positioning accuracy of the cylinder cover is improved.

Description

Accurate positioning system for cylinder head and simulated cylinder liner for airway test bench

The utility model belongs to the detection technology of performance parameters of an internal combustion engine, in particular to a device for accurately positioning a simulated cylinder liner arranged on a test cylinder head and a test workbench.

Background technique

The stable flow test bench for airway flow performance of internal combustion engine is a special equipment for testing engine airway parameters. When carrying out the steady flow test of the gas channel of the internal combustion engine, it is required to accurately position the test cylinder head and the simulated cylinder liner set on the test bench. The accuracy of this positioning is crucial for testing airway parameters such as flow coefficient and swirl ratio, which are closely related to engine power, economy and emission characteristics. For example: for a 4-valve diesel engine, the deviation between the cylinder centerline of the cylinder head and the simulated cylinder liner is 0.5mm, and the airway swirl ratio parameter changes by 25%, which has a very significant impact. Due to the wide variety of engine cylinder heads, and many cylinder heads are 6-cylinder heads with a weight of 150kg and a length of 1.2m, it is very difficult to accurately and quickly locate each cylinder of such length and weight. In addition, the positioning dimensions of different cylinder heads are also different. To realize the measurement of the flow characteristics of various cylinder heads on a set of steady flow test bench for the flow performance of the internal combustion engine, it is necessary to have universality for the positioning requirements of the cylinder head, so as to be able to Improve test bench testing efficiency and quality requirements.

At present, the positioning methods of the cylinder head mainly include: (1) marking method. Draw the centerline directly on the workbench of the airway flow performance steady flow test bench, and draw the centerline on each cylinder of the cylinder head at the same time, and then rely on the centerline to align the cylinder to ensure the simulation of the cylinder centerline and the workbench Liner centerlines are aligned. This way of working is time-consuming and laborious, and it is very inaccurate. The error may reach 0.2mm by eyes. It is especially difficult for large cylinder heads. The movement is done by manpower, and the efficiency is extremely low. (2) The way of positioning the flower plate. Such as "Cylinder head positioning flower plate for internal combustion engine air passage flow performance steady flow test bench" (ZL 200520025783.5). The biggest problem with this method is that the positioning accuracy cannot be guaranteed. There is no problem with the processing accuracy of the positioning plate itself. The main reason is that during the production and processing of the cylinder head, the maximum deviation of the side can reach ±0.5mm. The measurement of the airway characteristics of the valve engine is unacceptable, because the distance between the valve and the cylinder wall is sometimes only about 2mm, and this deviation can completely cause the deviation of the swirl ratio of the airway measurement by 1 time. In addition, this method does not take into account the movement of the cylinder head. It is also manually moved from one cylinder to another after testing, and at the same time re-moves and locks the positioning flower plate. At present, the engines that meet the Euro 3 and Euro 4 emission regulations all have a 4-valve cylinder head structure. The above two types of cylinder head cylinder center positioning methods and cylinder head movement methods are far from meeting the requirements, so there is an urgent need for an accurate Cylinder head positioning and movement methods meet the needs of engine flat engine production with strict emission requirements.

Contents of the invention

The purpose of the utility model is to provide a device for testing the accurate positioning of the cylinder head and the simulated cylinder liner set on the test workbench.

The technical structure and principle of the present invention will be described below with reference to FIGS. 1 to 3 . The system is mainly composed of a lifting component and a horizontal moving component. The lifting component is used to adjust the degree of freedom in the vertical direction; the horizontal moving component is used to adjust the degree of freedom in the horizontal direction. The functions of the two parts are mainly completed by connecting plates and brackets. The lifting components mainly include: driving cylinder, linear bearing, support plate, top block, connecting plate and guide column; the horizontal moving components are installed on the connecting plate, including supporting shaft, supporting plate, bracket, roller and baffle, etc. (as shown in the figure 1). Its structure is that the driving cylinder and the support plate are fixed as a whole, and the top block is connected with the top of the driving cylinder with threads. The central part of the support plate is hollowed out, and the top of the driving cylinder passes through the support plate. A guide post is welded on the lower end of the connecting plate, the connecting plate is suspended on the top block, the linear bearing is assembled in the channel on the supporting plate, and the bracket is welded on the end of the connecting plate. The support shaft is assembled on the bracket, the support shaft is covered with rollers, and the limit baffle is fixed on the side of the support shaft. The pallet used to test the positioning of the cylinder head is placed on the rollers, and the roller table is composed of several support shafts and several rollers. The pallet can be rolled on the roller table or on the roller table. Driven by the pressure in the driving cylinder, the support shaft, supporting plate, bracket, roller, stopper and guide post that are integrated with the end surface of the connecting plate can be displaced up and down along the linear bearing. The lower end of the supporting plate is provided with fine positioning pins; the desktop of the airway test bench is respectively provided with coarse positioning pins, horizontal pin holes, and vertical pin holes for the positioning of the supporting plate. The supporting plate passes through the positioning hole of the cylinder head and the positioning method of the cylinder head.

The working principle of the lifting assembly is: because the top of the driving cylinder is connected with the top block, the connection plate is suspended on the top block, and the supporting plate for testing the positioning of the cylinder head is placed on the support shaft and rollers on the connection plate. So the actuation of the drive cylinder (pressure-generated) allows the adjustment of the vertical position of the test cylinder head. In order to ensure that there is no deflection when the connecting plate moves up and down, it is necessary to ensure the parallelism between the connecting plate and the surface of the support plate (where the driving cylinder is fixed). For this reason, guide posts are welded on the connecting plate, and the guide posts pass through the support plate. The upper channel produces up and down displacement along the linear bearing.

The working principle of the horizontal moving component is: the supporting plate rolls on the roller table on the connecting plate bracket, and the test cylinder head placed on the supporting plate can easily move and adjust the horizontal position, and use the fine positioning pin provided on the lower end of the supporting plate Accurate positioning with the pin holes on the test bench.

If you want to test the air passage of a certain type of cylinder head, fix the cylinder head to be tested on the supporting plate, send the cylinder head to be tested to the top of the air passage test table through the lifting component, and adjust and control the vertical direction by the driving cylinder. height, and then adjust the position in the horizontal direction by the horizontal moving component, and the cylinder head for testing can be accurately positioned on the airway test bench. When other types of cylinder heads are to be tested, due to changes in cylinder center distance and cylinder bore size, the corresponding supporting plates for cylinder head positioning also need to be replaced, and one type of cylinder head corresponds to one type of supporting plate.

Description of drawings

Accompanying drawing 1 is the schematic diagram of the technical structure of the utility model system.

Accompanying drawing 2 planar schematic diagrams of pallets.

Accompanying drawing 3 is a schematic diagram of the three-dimensional structure of the pallet. The side with the pin in the figure is the lower end face of the supporting plate.

Accompanying drawing 4 is the schematic diagram of the desktop of the airway test bench.

Detailed ways

The structure and principle of the present utility model will be further described below through the embodiments in conjunction with the accompanying drawings.

Airway test bench test cylinder head and simulated cylinder liner accurate positioning system (as shown in Figure 1), with drive cylinder 1, linear bearing 2, support plate 3, jack block 4, connecting plate 5, guide column 6, support shaft 7, support Board 8, bracket 9, roller 10, block 11 and corresponding test bench table top etc. In the table top of the test bench: there is a round hole in the center of the table top of the air passage test bench, and the upper end of the simulated cylinder liner on the air passage test bench can just pass through this hole. A cylinder in the cylinder head of the internal combustion engine is docked with the simulated cylinder liner, and the O-ring is compressed under the gravity of the cylinder head to achieve the purpose of sealing. There are also two rectangular grooves hollowed out on the table top of the airway test bench. When the roller table moves in the vertical direction, it can just pass through the two rectangular grooves on the table top. The distance between the horizontal pin holes is the cylinder center distance of the measured cylinder head.

The driving cylinder 1 and the support plate 3 are fixed as a whole, the top of the driving cylinder 1 has external threads, and the top block 4 is connected to the top of the driving cylinder through internal threads. The central part of the support plate 3 is hollowed out so that the top of the driving cylinder 1 passes through the support plate 3 . The lower end surface of the connecting plate 5 is welded with a guide post 6 . The connecting plate 5 is suspended on the top block 4 . In order to reduce the frictional resistance caused by the guide post passing through the hole on the support plate, the linear bearing 2 is assembled in the hole on the support plate 3 with bolts. The upper end face of the connecting plate 5 is welded to the support 9, the support shaft 7 is assembled on the support 9, the support shaft 7 is equipped with rollers 10, and the limit baffle 11 is fixed on the side of the support shaft 7 to limit the left and right direction ( From the perspective of Figure 1) the displacement. A pallet 8 for testing cylinder head positioning is placed on rollers 10 . The roller table is formed by 22 supporting shafts 7 and 22 rollers 10, and the supporting plate 8 can be rolled on the roller table. Since the support plate 3 is fixed, the pressure in the driving cylinder can make the support shaft 7, the supporting plate 8, the bracket 9, the roller 10, the stopper 11 and the guide post 6 connected with the end surface of the connecting plate 5 to move along the linear bearing. 2 produces up and down displacement.

Adjust the pressure in the driving cylinder 1 so that the bottom surface of the supporting plate 8 is 40mm higher than the table top of the airway test bench. The cylinder head to be tested is positioned on the supporting plate by means of the cylinder head positioning hole 16 on the supporting plate, and two fine positioning pins 13 are installed on the lower end surface of the supporting plate. For example, if one of the cylinder air passages of the cylinder head to be tested is intended to be tested, the coarse positioning pin 12 is installed in the horizontal row pin hole 14 on the table top of the air passage test bench (Fig. 4). Push the supporting plate, when the front side of the supporting plate hits the coarse positioning pin 14 on the table top of the airway test bench, due to the blocking effect of the coarse positioning pin, the supporting plate stops moving, adjust the pressure in the driving cylinder, and the supporting plate slowly falls, so that the two Two fine positioning pins 13 are inserted in the corresponding vertical row pin holes 15 (Fig. 4) on the airway test bench desktop. The front end of the fine positioning pin 13 is tapered, and the position of the supporting plate can be adjusted in a small range under the action of the gravity of the cylinder head during the falling process. The pin holes 15 are vertically arranged, thus completing the positioning and installation of the cylinder head. If other cylinder air ducts of the cylinder head to be tested are to be tested, then the positions of the coarse positioning pin 12 and the fine positioning pin 13 are adjusted accordingly, and the above process can be repeated to achieve the purpose. In this embodiment, 22 supporting shafts and 22 rollers are used to form 2 rows of roller tables.

The beneficial effects and advantages of the utility model are: when testing the air passage of a multi-cylinder engine, the mass of the cylinder head itself is greater than 50kg, and the air passage of each cylinder must be tested separately, and must be positioned and installed separately. The system of the invention can realize accurate positioning and fast installation of the cylinder head. It not only saves time, but also improves the positioning accuracy of the cylinder head. Simultaneously, the lifting mechanism of the utility model can also be used for conveying, installing, cleaning and other work of medium and large objects.

Claims (3)

1. Accurate positioning system for testing the cylinder head and the simulated cylinder liner of the airway test bench, with the drive cylinder (1), linear bearing (2), support plate (3), top block (4), connecting plate (5), and guide column (6), support shaft (7), supporting plate (8), bracket (9), roller (10), stopper (11), coarse positioning pin (12), fine positioning pin (13) and the table top of the test bench, It is characterized in that the drive cylinder (1) and the support plate (3) are fixed as a whole, the top block (4) is connected with the top of the drive cylinder (1) with threads, the center part of the support plate (3) is hollowed out, and the drive cylinder (1) The top passes through the supporting plate (3), the lower end of the connecting plate (5) is welded with a guide column (6), the connecting plate (5) is suspended on the top block (4), and the linear bearing (2) is assembled on the supporting plate (3 ), the bracket (9) is welded on the upper end of the connecting plate (5), the support shaft (7) is assembled on the bracket (9), the support shaft (7) is set with the roller (10), and the limit baffle (11) Fixed on the side of the support shaft (7), the pallet (8) used to test the positioning of the cylinder head is placed on the roller (10), and the roller table is composed of several support shafts (7) and several rollers (10). (8) Can roll on the roller table, driven by the pressure in the drive cylinder, the support shaft (7), supporting plate (8), support (9), The roller (10), the stopper (11) and the guide column (6) generate vertical displacement along the linear bearing (2). 2. According to the airway test bench test cylinder head and the simulated cylinder liner accurate positioning system according to claim 1, it is characterized in that the lower end surface of the supporting plate (8) is provided with fine positioning pins (13); The desktop is respectively provided with coarse positioning pins (12), horizontal pin holes (14), and vertical pin holes (15) for positioning the supporting plate (8). 3. According to the airway test bench test cylinder head and simulated cylinder liner accurate positioning system according to claim 1 or 2, it is characterized in that the supporting plate (8) is positioned through the cylinder head positioning hole (16) and the cylinder head.

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