Lead screw polishing device for ball screw electric power steering gear

Abstract

The utility model relates to a lead screw polishing device for a ball screw electric power steering gear. A main body comprises a servo motor, an eccentric shaft, an eccentric disc, a bearing seat, a connecting rod, an air cylinder, a swing shaft and the like, the main body part is connected with a rotating disc through a bolt, the rotating disc is connected with an integral support through a bolt, and the meshing angle between an oilstone and a roller path can be adjusted according to the lead angles of different lead screws. During use, a lead screw is installed on a three-jaw of a lathe, a tailstock of the lathe abuts against the lead screw, the lead screw polishing device is fixed to a small carriage of the lathe, an oilstone is manually aligned into a lead screw raceway, the oilstone compresses the lead screw raceway through an air cylinder, the oilstone swings in the lead screw raceway at high frequency, and a lead screw main shaft rotates to be matched with a middle carriage in a moving mode. The rotation speed of the main shaft multiplies the screw pitch of the lead screw by the moving speed of the middle dragging plate, and full-stroke raceway polishing of the lead screw is achieved. The oilstone swinging device has the advantages of wide application range, adjustable oilstone pressure, adjustable oilstone swinging speed and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the ball screw automobile electric power steering gear processing field, is a ball screw electric power steering gear with screw polishing device. BACKGROUND

[0002] In the automobile power steering system, due to the mechanical steering system, hydraulic steering system structure is complex, energy consumption is high, pollutes the environment, power steering feel is poor and other reasons, electric power steering gear can overcome many shortcomings, gradually become mainstream. Ball screw electric power steering gear screw polishing equipment also be needed by many companies.

[0003] The known ball screw electric power steering gear screw polishing equipment is mostly standard machine tool, and the surface roughness of the ground screw raceway cannot meet the requirements, and the screw raceway knife mark is single, causing the ball screw electric power steering gear to be noisy when running.

[0004] The device is simple in principle, easy to operate, accurate in adjustment, and the polishing operation frequency can be adjusted. SUMMARY

[0005] The utility model aims at solving the screw polishing problem of ball screw electric power steering gear by simple equipment.

[0006] The technical problem of the utility model is realized by the following technical scheme:

[0007] A ball screw electric power steering gear screw polishing device, the main components include servo motor, eccentric shaft, eccentric disc, bearing seat, connecting rod, oil stone pressing cylinder, swing shaft, etc., the main part is connected with the rotating disc through bolts, the rotating disc is connected with the overall support through bolts, and the meshing angle of the oil stone and the raceway can be adjusted according to the helix angle of different screws. In use, the screw is installed on the lathe three-jaw chuck, the tailstock of the lathe is pressed against the screw, the screw polishing device is fixed on the small drag plate of the lathe, the oil stone is manually put into the screw raceway, the oil stone is pressed against the screw raceway through the cylinder, the oil stone swings in the screw raceway at high frequency, and the rotation speed of the main shaft multiplied by the pitch of the screw is the moving speed of the middle drag plate, realizing the raceway polishing of the screw full stroke. The utility model has the advantages of wide application range, adjustable oil stone pressure, adjustable oil stone swing speed and the like.

[0008] Preferably, the servo motor, eccentric shaft, eccentric disc, bearing seat, connecting rod, cylinder and swing shaft form the swing polishing main body, the main part is connected with the rotating disc through bolts, the rotating disc is connected with the overall support through bolts, the meshing angle of the oil stone and the raceway is adjusted according to the helix angle of different screws, and the swing frequency of the oil stone is adjusted through the rotation speed of the servo motor

[0009] Preferably, the ball screw electric power steering gear for ball screw polishing device, characterized by: the ball screw is installed to the lathe three claws, the lathe tailstock is tightly pressed to the ball screw, the ball screw polishing device is fixed on the lathe small drag plate, the oil stone is high-frequency swing in the ball screw raceway, the rotation speed of the main shaft is multiplied by the pitch of the ball screw, and the moving speed of the middle drag plate can adapt to different types of ball screws

[0010] Preferably, the ball screw electric power steering gear for ball screw polishing device, characterized by: the oil stone is connected to the air cylinder and is pressed in the raceway through the air cylinder, and the pressure can be adjusted through the air source pressure

[0011] The application has the advantages and positive effects that:

[0012] The application has wide application range, adjustable oil stone pressure and adjustable oil stone swing speed BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a schematic view of the installation lathe of the utility model

[0014] 1 is a lathe, 2 is a mounting cushion block, 3 is a ball screw for electric power steering gear

[0015] Figure 2 It is a front view of the utility model

[0016] 4 is a servo motor, 5 is a shaft coupling, 6 is a bearing seat, 7 is an eccentric shaft, 8 is a connecting rod, 9 is an eccentric disc, 10 is a swing shaft, and 11 is a rotating disc

[0017] Figure 3 It is a rear view of the utility model

[0018] 12 is a centering shaft, 13 is an integral support, and 14 is a mounting bottom plate

[0019] Figure 4 It is a sectional view of the utility model

[0020] 15 is an oil stone, 16 is an oil stone mounting block, 17 is a bearing seat cushion block, and 18 is an air cylinder DETAILED DESCRIPTION

[0021] As shown in the figure, a screw polishing device for electric power steering gear, mainly comprising lathe 1, mounting pad 2, screw for electric power steering gear 3, servo motor 4, shaft coupling 5, bearing seat 6, eccentric shaft 7, connecting rod 8, eccentric disc 9, swing shaft 10, rotating disc 11, aligning shaft 12, overall support 13, mounting bottom plate 14, oil stone 15, oil stone mounting block 16, bearing seat pad 17, air cylinder 18. When working, the screw polishing device is fixed on the small carriage plate of the lathe 1, and the height of the oil stone 15 and the lathe 1 is adjusted through the mounting pad 2. The screw for electric power steering gear 3 is fixed on the three-jaw chuck of the lathe 1 and the tailstock of the lathe is pressed against the screw for electric power steering gear 3. The angle between the overall support 13 and the rotating disc 11 support is adjusted to keep the helix angle of the oil stone 15 and the raceway of the screw for electric power steering gear 3 the same, the oil stone 15 is moved into the raceway of the screw for electric power steering gear 3 by moving the small carriage plate of the lathe 1, the air cylinder 18 is extended to keep the oil stone 15 and the raceway of the screw for electric power steering gear 3 fixed under pressure, the servo motor 4 is started, the servo motor 4 is connected to the shaft coupling 5, the shaft coupling 5 is connected to the eccentric shaft 7, the eccentric shaft 7 is connected to the connecting rod 8, the connecting rod 8 is connected to the eccentric disc 9, the eccentric disc 9 is connected to the swing shaft 10 to swing at high frequency, and the swing frequency is the rotation speed of the servo motor. The oil stone 15 is connected to the swing shaft 10 through the oil stone mounting block 16 and the air cylinder 18 and swings with the swing shaft 10. The lathe 1 is started to make the spindle and the middle carriage plate of the lathe move at the same time, the spindle rotation speed multiplied by the lead of the screw for electric power steering gear 3 is the moving speed of the middle carriage plate, and the moving direction of the middle carriage plate is the advancing direction of the raceway of the screw for electric power steering gear 3 when the spindle rotates. When the oil stone 15 reaches the limit position on one side of the raceway of the screw for electric power steering gear 3, the spindle and the middle carriage plate of the lathe move in the opposite direction at the same time, and the same action is repeated when reaching the limit position on the other side. The polishing cycle number is adjusted according to the actual effect. After polishing, the spindle of the lathe 1 stops rotating, the middle carriage plate stops moving, the servo motor 4 stops rotating, the air cylinder 18 retracts, the oil stone 15 is withdrawn from the raceway of the screw for electric power steering gear 3, and the polishing work is completed.

Claims

1. A ball screw polishing device for a ball screw electric power steering gear, characterized by: Servo motor, eccentric shaft, eccentric disc, bearing seat, connecting rod, cylinder, cylinder swing shaft composed of its swing polishing main body, main body and rotating disc through bolt connection, rotating disc and the overall support bolt connection, according to the different screw helix angle adjustment oil stone and the engagement angle of the raceway, through the servo motor speed regulation oil stone swing frequency, device installation to the lathe use.

2. The ball screw polishing device for electric power assisted steering gear according to claim 1, characterized in that: The screw is installed on the three-jaw of the lathe, the tailstock of the lathe is pressed against the screw, the screw polishing device is fixed on the small carriage of the lathe, the screw oil stone is high frequency swing in the screw raceway, the speed of the spindle multiplied by the pitch of the screw is the moving speed of the middle carriage, which can adapt to different types of screws.

3. The ball screw polishing device for electric power assisted steering gear according to claim 1, characterized in that: The oil stone connecting cylinder is pressed in the raceway by the cylinder, and the pressure can be adjusted by the gas source pressure.

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