UA68413C2 - Steering gear with built-in amplifier - Google Patents

Abstract

Steering gear of a vehicle with a mounted amplifier contains housing, in which the piston is mounted, one part of which has axial opening and divides the interior of housing into two working chambers connected through the distributor with the source of pressure of fluid. The toothed rack is located on another part of the piston, the initial plane of this rack is placed on the same level with the axis of piston, which enters into engagement with the gear quadrant of the shaft of the drop arm. Screw is mounted coaxially with the piston and it is cinematically connected with it with by a ball-and-screw transmission. Cross-section profile of the part of the piston, on which is located the toothed rack, is made in the form of annular segment, in which the nut is motionlessly mounted relative to the piston. Nut has, at least, two return channels of balls made in the shaped inserts, which are mounted in the cuts of the nut. The axial opening of piston is stepped, in this case the opening of larger diameter is placed from the side of the toothed rack. The end part of the nut is made in the form of a bushing and is fixed in the opening of piston with the help of the taper keys. Piston is made with an inclined surface between the part dividing the cavity of housing into two working chambers and the surface of the points of teeth of the rack.

Description

Description of the invention

The invention relates to transport engineering, in particular to steering mechanisms with a built-in hydraulic amplifier.

The closest technical solution, chosen as a prototype, is a steering mechanism of a vehicle with a built-in amplifier, containing a housing in which a piston is installed, one part of which divides the cavity of the housing into two working chambers, which are connected through a distributor with a source of fluid pressure, and has axial hole, and on the other part there is a toothed rail, which forms an engagement with the toothed 70 sector of the bipod shaft, a screw installed coaxially with the piston and connected to it by a ball screw transmission.

A feature of the design is that the axes of the piston and the screw are located at the same level as the initial plane of the toothed rack, while the teeth of the rack and the sector of the bipod shaft have grooves for the passage of the screw /see application

Mo. 99102113/28, according to which a decision was made to issue a patent of the Russian Federation.

A disadvantage of the known steering mechanism is the placement of the ball screw gear and rack on different 72 parts of the piston. This leads to deterioration of the compactness of the steering mechanism, especially in the direction of the piston axis.

The basis of the invention is the task of creating such a steering mechanism in which the ball screw gear and the gear rack are located in the axial direction on one part of the piston, which leads to increased compactness, as a result of which the dimensions of the steering mechanism are reduced.

The task is solved by the fact that in the steering mechanism of a vehicle with a built-in amplifier, which contains a housing in which a piston is installed, one part of which has an axial hole and divides the housing cavity into two working chambers, which are connected through a distributor with a source of fluid pressure, and on on the other, there is a toothed rail, the initial plane of which is placed at the same level as the axis of the piston, which engages with the toothed sector of the bipod shaft, a screw installed coaxially with the piston and kinematically connected with it by a ball screw transmission, according to the invention, cross-sectional profile part of the piston, on which the toothed rack is located, is made in the form of an annular segment, in which a nut is installed stationary relative to the piston, the screw groove of which interacts with the balls of the ball screw transmission, and a groove is made in the toothed sector of the bipod shaft for placing the nut.

The nut has at least two return channels of balls made in profile inserts installed in the nut slots, while the outer surface of the profile inserts is in contact with the inner surface of the ring segment.

The axial hole of the piston is stepped, while the hole with a larger diameter is located on the side of the toothed Z rail. Gee)

The nut is endowed with an end part made in the form of a sleeve, which is located in the hole of the piston of the larger

From the diameter, while the outer diameter of the end part exceeds the outer diameter of the nut. at

The end part of the nut is fixed in the hole of the piston with the help of wedge keys installed in the grooves of the piston and the end part of the nut.

Wedge keys are fixed with threaded plugs. The piston is made with an inclined surface between the part that divides the body cavity into two working chambers -o and the surface of the tops of the rack teeth. c The angle of inclination of the surface to the vertical axis does not exceed half of the full angle of rotation of the bipod shaft. :z» Making the profile of the cross section of the part of the piston, on which the gear rack is located, in the form of an annular segment, in which a nut is installed stationary relative to the piston, the screw groove of which interacts with the balls of the ball screw gear, allows you to place the ball screw gear and the gear rack on the same b» 395 area of the piston, which increases compactness, ensuring a reduction in the dimensions of the steering mechanism.

Making return channels in profile inserts installed in the slots of the nut, the outer surface of which is in contact with the inner surface of the ring segment, allows you to significantly reduce the labor cost of manufacturing and assembling the ball screw transmission, to eliminate the possibility of reducing the strength and rigidity of the toothed rack, because there is no need to make a return channel in the body of the piston in the area of placement - 70 toothed rack and manufacture of a special reflector; reduce friction losses and significantly facilitate the circulation of balls, because the insert connects adjacent screw grooves, which leads to increased reliability of the ball screw transmission; reducing the radial size of the nut; increase the reliability of the ball screw transmission by eliminating the radial movement of the profile inserts.

Making the axial hole of the piston stepped and placing a hole with a larger diameter on the side of the toothed rack, in which the end part of the nut is installed and fixed, allows you to fix the nut outside the area

GF) a piston on which a toothed rack is placed, which excludes the possibility of reducing the strength and rigidity of the rack. 7 Exceeding the outer diameter of the end part of the nut of the outer diameter of the nut allows accurate processing of only the outer surface of the end part, which is located in the piston hole, which ensures a reduction in the complexity of manufacturing the nut. because fixing the end part of the nut with the help of wedge keys, fixed with threaded plugs, placed in the grooves of the piston and the end part allows you to fix the nut immovably relative to the piston.

The design of the piston with an inclined surface between the part that divides the body cavity into two working chambers and the surface of the tops of the teeth of the rack allows to bring the attachment points as close as possible to the working area of the nut, which increases the compactness of the mechanism, because it is not necessary to increase the longitudinal size of the piston to accommodate the attachment points.

Placing the inclined surface relative to the vertical axis at an angle that does not exceed half of the full angle of rotation of the bipod shaft makes it possible to exclude the possibility of piston contact with the bipod shaft at the extreme right position of the piston.

The essence of the invention is explained by the drawings, where Fig. 1 shows the steering mechanism, a longitudinal section: in Fig. 2 - steering mechanism, cross section, in fig. C - steering mechanism, when the piston is in the extreme right position; in fig. 4 - piston; in fig. 5 - section along line A-A in Fig. 3; in fig. 6 - section along the line B-B in fig. 5.

The steering mechanism of a vehicle with a built-in amplifier contains a housing 1 in which a piston 2 is installed 70, part C of which divides the cavity of the housing 1 into working chambers 4 and 5, which are connected to a source of fluid pressure through a distributor (not shown in the drawings). On the part 7 of the piston 2 there is a toothed rack 8, the initial plane 9 of which is placed at the same level as the axis 10 of the piston 2. The teeth of the rack 8 are engaged with the toothed sector 11, made together with the shaft 12 of the bipod.

Axial holes 13 and 14 are made in piston 2. The profile of the cross section of part 7 of piston 2 has the form /5 of the ring segment 15, on the flat surface 16 of which the tops of the teeth of the rack 8 are located. The center of the parts of the concentric circles that form the ring segment 15 is located on the axis 10 .

Between part C of the piston 2 and the flat surface 16, an inclined surface 17 is made, the angle of inclination of which to the vertical axis does not exceed half of the full angle of rotation of the shaft 12 of the bipod. A nut 18 with a screw groove 19 is installed in the annular segment 15, the end part 20 of which is made in the form of a bushing, while the outer diameter of the end part 20 is greater than the outer diameter of the nut 18. The end part 20 is placed without a gap in the hole 14 of the piston 2 and fixed immovably relative to the piston 2 by wedge keys 21, which are fixed by threaded plugs 22 located in the grooves 23 of the piston 2 and the grooves 24 of the end part 20 of the nut 18.

Screw 25 with an external screw groove 26 is installed in housing 1 coaxially with piston 2 and passes through holes 13 and 14.

The screw grooves 19 of the nut 18, the screw grooves 26 of the screw 25 and the balls 27 located in them form a ball screw gear that kinematically connects the piston 2 and the screw 25. i)

Slots are made in the nut 18 in which profile inserts 28 with return channels 29 of balls 27 are placed.

The outer surface of the liners 28 is in contact with the inner surface 30 of the ring segment 15.

In the toothed sector 11, a groove 31 is made for placing the nut 18. с зо The steering mechanism works as follows.

When the steering wheel of the vehicle rotates, the steering shaft is turned by the coil 25 and 0007 of the rotor of the distributor 6 relative to the stationary wheels of the vehicle under the force of turning resistance. Angular "K movement of the rotor of the distributor b determines the direction of movement of the working fluid, which is fed into chamber 4 or chamber 5 of piston 2. As a result, piston 2 moves in one direction or another and, therefore, with 5 Angular movement of the toothed sector 11, which, rotating shaft 12 bipod, controls the rotation of the wheels of the vehicle.

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Claims (8)

The formula of the invention (ee) ve 1. Steering mechanism of a vehicle with a built-in amplifier, containing a housing in which -kd 70 a piston is installed, one part of which has an axial hole and divides the cavity of the housing into two working chambers, which are connected through a distributor to a pressure source liquid, and on the other is a toothed rail, the initial plane of which is placed at the same level as the axis of the piston, which engages with the toothed sector of the bipod shaft, a screw installed coaxially with the piston and kinematically connected to it by a ball screw gear, which is distinguished by that the profile of the cross-section of the part of the piston on which the toothed rack is located is made in the form of an annular segment, in which a nut is installed stationary relative to the piston, the screw groove of which has the possibility of interaction with the balls of the ball screw transmission, and in the toothed sector of the bipod shaft, a groove is made for placing the nut . 2. The steering mechanism according to claim 1, which is characterized by the fact that the nut has at least two return channels of balls made in profile inserts installed in the slots of the nut, while the outer surface of the profile inserts 60 is in contact with the inner surface of the ring segment. 3. The steering mechanism according to claim 1, which is characterized by the fact that the axial hole of the piston is stepped, while the hole with a larger diameter is located on the side of the toothed rack. 4. The steering mechanism according to claims 1 and 3, which is characterized by the fact that the nut is equipped with an end part made in the form of a sleeve, which is located in the piston hole of a larger diameter, while the outer diameter of the end part 65 exceeds the outer diameter of the nut. 5. The steering mechanism according to claim 4, which is characterized by the fact that the end part of the nut is fixed in the hole of the piston with the help of wedge keys installed in the grooves of the piston and the end part of the nut. 6. The steering mechanism according to claim 5, which differs in that the wedge keys are fixed with threaded plugs. 7. The steering mechanism according to claim 1, which is characterized by the fact that the piston is made with an inclined surface between the part that divides the body cavity into two working chambers and the surface of the tops of the rack teeth. 8. The steering mechanism according to claim 7, which is characterized by the fact that the angle of inclination of the surface to the vertical axis does not exceed half of the full angle of rotation of the bipod shaft. Official bulletin "Industrial Property". Book 1 "Inventions, useful models, topographies of integrated microcircuits", 2004, M 8, 15.08.2004. State Department of Intellectual Property of the Ministry of Education and Science of Ukraine. 6) (ze) «- « (ee) (Se) - and? (o) (ee) sh» - 70 syu» ime) 60 b5