Engine water pump belt pulley press fitting device

Abstract

The utility model discloses an engine water pump belt pulley press fitting device which comprises a base, a supporting plate, floating devices and a distance measuring sensor, a vertical pump shaft can be supported in the middle of the base, the supporting plate can float up and down on the base through the floating devices arranged in a matrix mode, the supporting plate is used for positioning a pump shell, and the distance measuring sensor is fixed on the base. The distance measuring sensor is used for determining whether the supporting plate moves to a stop position; according to the utility model, a fixed reference surface in a traditional scheme is changed into a floating reference surface, and a movable supporting mechanism is changed into a fixed supporting mechanism; the floating reference surface is adopted, the actual position of the measurement reference is used as the relative reference of the servo system, and the press-fitting size of a product is directly used as a press-fitting increment displacement value by the press-fitting machine control system, so that the mounting size is ensured, and the problem of damage to a bearing is eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile water pump installation equipment, in particular to a press-fit device for an engine water pump pulley. Background Art

[0002] like Figure 1 As shown, the water pump is mainly composed of a pump housing 1, a pump shaft 2, a bearing 3, a water seal 4, an impeller 5 and a pulley 6. The pump shaft is installed in the shaft cavity of the pump housing through the bearing and the water seal. One end of the pump shaft is connected to the impeller, and the pulley is assembled to the other end of the pump shaft. The existing press-fitting method of the pulley adopts the cooperation mode of the pressure head 7 + the inclined wedge mechanism 8, and the self-locking characteristics of the inclined wedge mechanism are used to ensure that the inner ring of the bearing is subjected to force during the press-fitting process, and the inner and outer rings of the bearing are not subjected to shear force during the press-fitting process. The self-locking principle of the inclined wedge mechanism is that the component force along the inclined surface direction is less than the static friction force, that is, it can maintain self-locking when subjected to static pressure. However, there will generally be vibration during the press-fitting process, and the self-locking function will fail in the vibrating state. When the press-fitting force is large and the roughness and roundness of the parts change greatly, the vibration generated is large, resulting in self-locking failure, displacement of the inclined wedge mechanism, and shear force on the inner and outer rings of the bearing, thereby causing damage to the bearing raceway. This damage is not easy to detect during the assembly process, and the life of the bearing will be greatly reduced during use, leading to after-sales compensation problems. Utility Model Content

[0003] The utility model provides a press-fit device for an engine water pump pulley, aiming to solve the technical problem of bearing damage in the existing press-fit method.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: an engine water pump pulley press-fitting device, characterized in that it includes a base, a support plate, a floater and a distance sensor, the middle part of the base can support the vertical pump shaft, the support plate can float up and down on the base through the floater arranged in a matrix, the support plate is used to position the pump casing, the distance sensor is fixed on the base, and the distance sensor is used to determine whether the support plate has moved to the stop position.

[0005] The above technical solution is further limited in that the structure of the base includes a bottom plate, and a support block is provided at the center of the bottom plate.

[0006] The above technical solution is further limited in that the structure of the support plate includes a plate body, and a pump casing positioning hole is provided at the center of the plate body.

[0007] The above technical solution is further limited. The structure of the floater includes a guide column and a spring. The lower end of the guide column is fixedly connected to the edge of the base plate. The spring is mounted on the guide column. The upper end of the guide column passes through the guide hole on the edge of the support plate and is connected to the locking nut. The guide column can guide the support plate for sliding.

[0008] The above technical solution is further limited in that the distance measuring sensor is a displacement sensor.

[0009] The above technical solution is further improved in that a slot is provided on the support block of the base corresponding to the pump shaft, and an FSR thin film pressure sensor is provided in the slot.

[0010] Beneficial effects: The utility model changes the fixed reference plane in the traditional solution into a floating reference plane, and changes the movable support mechanism into a fixed support mechanism; the floating reference plane is adopted, and the actual position of the reference is measured as the relative reference of the servo system, and the press control system directly uses the product press size as the press incremental displacement value to ensure the installation size; the fixed support is used as the force point of the press to solve the common displacement problem of the auxiliary support; the utility model has a simple and reliable structure, which ensures the press quality and protects the bearing from damage during the press process. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the existing press-fitting method in the background technology.

[0012] Figure 2 It is the front view of the utility model.

[0013] Figure 3 yes Figure 2 Top view of the .

[0014] Figure 4 It is a press-fitting schematic diagram of the utility model.

[0015] Figure 5 yes Figure 4 Schematic diagram of the positioning and matching of the middle pump casing support plate. DETAILED DESCRIPTION

[0016] like Figure 2 and Figure 3 As shown, an engine water pump pulley press-fitting device comprises a base 9, a support plate 10, a floater 11 and a distance sensor 12. The middle part of the base can support a vertical pump shaft. The support plate can float up and down on the base through the floater arranged in a matrix. The support plate is used to position the pump housing. The distance sensor is fixed on the base and is used to measure the displacement of the support plate.

[0017] like Figure 2 and Figure 3 As shown, the structure of the base 9 includes a bottom plate 901, which can be fixedly connected to the working table of the press machine, and a support block 902 is welded at the center of the bottom plate; this structure is simple, low in production cost, long in service life, and strong in versatility;

[0018] like Figure 2 and Figure 3As shown, the structure of the support plate 10 includes a plate body 101, a pump housing positioning hole 102 is provided at the center of the plate body, and guide holes are distributed on the edge of the plate body; this structure is simple, low in production cost, long in service life, and strong in versatility;

[0019] like Figure 2 and Figure 3 As shown, the structure of the floater 11 includes a guide column 111 and a spring 112. The lower end of the guide column is fixedly connected to the edge of the bottom plate, the spring is sleeved on the guide column, and the upper end of the guide column passes through the guide hole on the edge of the support plate and is connected to the locking nut 113. The guide column can guide the support plate to slide. This structure is simple, low in production cost, easy to maintain, and has a long service life.

[0020] like Figure 2 and Figure 3 As shown, the distance sensor 12 is a displacement sensor, and the probe of the displacement sensor is in contact with the support plate; the displacement sensor has the advantages of easy digitization, high precision, strong anti-interference ability, no reading error, easy installation, and reliable use;

[0021] like Figure 2 and Figure 3 As shown, a slot is provided on the support block of the base 9 corresponding to the pump shaft, and an FSR film pressure sensor 13 is provided in the slot, so as to further determine the contact between the pump shaft and the support block, and further ensure the press-fitting quality;

[0022] In order to further ensure the positioning stability of the pump casing on the supporting plate, a positioning pin can be provided on the upper supporting plate, and the positioning pin matches the connecting hole on the flange surface of the pump casing.

[0023] Because the engine water pump is light and small, the press machine used is a servo press, and a rectangular pressure head is provided on the outer end of the cylinder piston rod; Figure 4 and Figure 5 As shown, after the pump casing, pump shaft, bearing, water seal and impeller are assembled together, the flange surface of the pump casing fits the support surface of the support plate, the impeller is located in the positioning hole, and the annular flange on the flange surface of the pump casing forms a positioning match with the positioning hole to form a stop structure. After the shaft hole on the pulley is aligned with the upper end of the pump shaft, the press is started, and the pressure head on the press pushes the pulley, pump casing and support plate downward together. When the lower end of the pump shaft contacts the support block of the base, the displacement sensor reads the displacement value of the support plate and transmits it to the servo system as the reference value of the press size. The servo system controls the pressure head to continue to move downward according to the incremental displacement value set by the program until the pulley is pressed to the target displacement value to ensure the assembly size; in order to further ensure the assembly quality, a pressure sensor is added, and the pressure sensor transmits the pressure signal to the servo system to further determine that the pump shaft and the support block are in contact; the diameter of the pressure sensor is smaller than the pump shaft, and the support block does not interfere with the impeller.

Claims

1. An engine water pump pulley press-fitting device, characterized in that: It includes a base, a pallet, a floater and a distance sensor. The middle part of the base can support the vertical pump shaft. The pallet can float up and down on the base through the floater arranged in a matrix. The pallet is used to position the pump casing. The distance sensor is fixed on the base. The distance sensor is used to determine whether the pallet has moved to the stop position.

2. The engine water pump pulley press-fitting device according to claim 1, characterized in that: The structure of the base comprises a bottom plate, and a support block is arranged at the center of the bottom plate.

3. An engine water pump pulley press-fitting device according to claim 1 or 2, characterized in that: The structure of the support plate comprises a plate body, and a pump casing positioning hole is arranged at the center of the plate body.

4. The engine water pump pulley press-fitting device according to claim 3, characterized in that: The structure of the floater includes a guide column and a spring. The lower end of the guide column is fixedly connected to the edge of the base plate. The spring is sleeved on the guide column. The upper end of the guide column passes through the guide hole on the edge of the support plate and is connected to the locking nut. The guide column can guide the support plate for sliding.

5. The engine water pump pulley press-fitting device according to claim 1, 2 or 4, characterized in that: The distance measuring sensor is a displacement sensor.

6. The engine water pump pulley press-fitting device according to claim 5, characterized in that: A slot is provided on the support block of the base corresponding to the pump shaft, and a FSR film pressure sensor is provided in the slot.

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