DE102015201695A1 - Transmission device for controlling the displacement movement of an organ and brake system, which is equipped with such a transmission device which forms a brake booster - Google Patents

Abstract

A transmission device for controlling displacement movement of an organ (1) comprising a stationary housing (110) comprising an outer planetary gear (120) internally provided with teeth (122) and an inner planetary gear (140) associated with said planetary gear controlled organ (1), receives, and a rack (141) in the displacement direction (xx) carries. A satellite carrier (130) provided with helical-toothed satellite wheels (131) which mesh with the inner teeth (122) and the rack (141) allows the displacement movement of the inner planetary gear (140) to be controlled. The transmission device is driven by a motor (2) having a transmission (3) which acts on either the outer planetary gear (120) or the satellite carrier (130).

Description

THE iNVENTION field

The present invention has for its object a transmission device for controlling the displacement movement of an organ and a brake system equipped with such a transmission device forming a brake booster.

State of the art

There are numerous actuators or actuators and in particular in the field of brake systems. These actuators, also called brake boosters, amplify the force exerted on the primary piston of the master cylinder in response to actuation on the brake pedal. These brake booster work either with vacuum or with electric or hydraulic assistance.

These pneumatic brakes may not be suitable for vehicles with electric or hybrid drive. The brake booster electrical type require a lot of space.

Object of the invention

The present invention has the object, in general, of a transmission device which allows to convert a rotational movement into a displacement movement of a controlled object and, in particular, a transmission device which can be applied as a brake booster to a brake system.

Presentation and advantages of the invention

• – ein stationäres Gehäuse, das Folgendes aufnimmt: • ein externes Planetenrad in Hülsenform, das innen mit einer inneren Schraubenverzahnung versehen ist, • ein inneres Planetenrad, das drehfest und in Verschiebung frei ist, das mit dem Organ verbunden ist und eine Zahnstange in die Verschiebungsrichtung (xx) des Organs trägt, • einen Satellitenträger, • wobei das äußere Planetenrad oder der Satellitenträger in Drehung angetrieben wird, während der Satellitenträger oder das äußere Planetenrad in Bezug auf das Gehäuse stationär ist, dadurch gekennzeichnet, dass • der Satellitenträger mit mindestens einem Satellitenrad mit Schrägverzahnung versehen ist, das in die innere Schraubenverzahnung und in die Zahnstange eingreift.

For this purpose, the present invention has a transmission device for controlling the displacement movement of an organ, which has the following:

• A stationary housing which accommodates: an external planetary gear in sleeve form internally provided with internal helical splines; an inner planetary wheel which is non-rotatable and free in displacement connected to the organ and a rack in the direction of displacement (xx) of the organ, • a satellite carrier, • wherein the outer planetary gear or the satellite carrier is driven in rotation while the satellite carrier or the outer planet gear is stationary with respect to the housing, characterized in that • the satellite carrier with at least one satellite wheel is provided with helical teeth, which engages in the inner helical teeth and in the rack.

This transfer device has the advantage that it takes up very little space, consists of a greatly reduced number of components, and efficiently converts a rotary motion into a translational movement, either a pushing motion or a pulling motion, or even resisting the reaction exerted by a spring on the shaft controlled organ is exercised.

According to another advantageous feature, the satellite wheel is barrel-shaped and the rack has a curved toothing. The domed shape of both the satellite wheel or the satellite wheels and the rack or racks permits linear contact at the point of tangency of the gears, which improves the efficiency of the transmission and allows transmission of substantially greater forces compared to straight point contact gears, so that Conditions of use transmission can perform with plastic satellite wheels, which considerably simplifies the production and the costs or lowers.

According to another advantageous feature, the satellite carrier is provided with groups of three circumferentially spaced apart satellite wheels, and the inner planetary gear is provided with at least three racks aligned according to the translation axis (xx) to interact with the satellite wheels.

By multiplying the sets of satellite wheels, and in particular by three satellite wheels per group, the forces exerted on each satellite wheel can be reduced, and thus the manufacture can be simplified by the use of plastics to realize the satellite wheels and possibly the satellite carrier.

In the simplest case, the satellite carrier has only one satellite wheel or a paired satellite wheel. In general, however, it is advantageous for reasons of symmetry to have a satellite support provided with at least three satellite wheels or three pairs of satellite wheels co-operating with a rack of one or more parts made on the inner planetary gear.

According to another advantageous feature, the satellite carrier is provided with paired satellite wheels.

According to another feature, the crown of the outer planetary gear is provided with a drive toothing, which allows to have a large diameter pinion, in which engages the output of the motor which drives the transmission device, and therefore forms a reduction gear directly in the region of the transmission device ,

According to another feature, the inner planet gear has at least one rack on a flattened longitudinal band. The cross section of the inner planetary gear, which is preferably tubular, has a polygonal cross-section on the outside, of which certain segments correspond to a flattened longitudinal band in which a rack is made. The number of flattened longitudinal belts with a rack advantageously corresponds to the number of satellite wheels of the satellite carrier.

However, the rack may also be made on the entire circumferential surface of the inner planetary gear, and in this case, this peripheral surface is cylindrical with a circular cross-section so that the satellite wheels can rotate about the inner planetary gear, with the input of the movement therefore being made by the satellite carrier while the outer planetary gear remains stationary under these circumstances.

• – ein stationäres Gehäuse, das Folgendes aufnimmt: • ein externes Planetenrad in Hülsenform, das innen mit einer inneren Schraubenverzahnung versehen ist, • ein inneres Planetenrad, das drehfest und in Verschiebung frei ist, das mit dem Organ verbunden ist und eine Zahnstange in die Verschiebungsrichtung (xx) des Organs trägt, – einen Satellitenträger, der mit mindestens einem Satellitenrad mit Schrägverzahnung versehen ist, das in die innere Schraubenverzahnung und in die Zahnstange eingreift, • wobei das äußere Planetenrad oder der Satellitenträger in Drehung angetrieben wird, während der Satellitenträger oder das äußere Planetenrad in Bezug auf das Gehäuse stationär ist,
• – einen Steuerschaft, der mit dem Bremspedal und mit einem Kolben verbunden ist, der auf eine Reaktionsscheibe parallel zu einem Zwischenkolben einwirkt, der dem Schub des inneren Planetenrads ausgesetzt ist und die Schubbewegung an den Primärkolben des Hauptzylinders überträgt,
• – einen Motor, der anhand eines Getriebes mit der äußeren Verzahnung des Kranzes des äußeren Planetenrads in Eingriff ist.

The invention also has for its object a brake system comprising a master cylinder and a brake booster, the brake booster being a transmission device for controlling the displacement movement of an organ, comprising:

• A stationary housing which accommodates: an external planetary gear in sleeve form internally provided with internal helical splines; an inner planetary wheel which is non-rotatable and free in displacement connected to the organ and a rack in the direction of displacement (xx) of the organ, - a satellite carrier provided with at least one helical-toothed satellite meshing with the internal helical gear and the rack, • the outer planetary gear or the satellite carrier being driven in rotation while the satellite carrier or the satellite carrier outer planetary gear is stationary with respect to the housing,
• A control shaft connected to the brake pedal and to a piston acting on a reaction disk parallel to an intermediate piston which is subjected to the thrust of the inner planetary gear and transmits the pushing movement to the primary piston of the master cylinder,
• - A motor which is based on a transmission with the outer toothing of the ring of the outer planet gear in engagement.

This braking system has the advantage that it requires little space in the region of the brake booster combined with the master cylinder.

drawings

The present invention will be explained in more detail below with the aid of transfer device examples shown in the accompanying drawings, in which:

1 is an isometric sectional view of a first embodiment of a transfer device,

2 a simplified isometric view of the transfer device of 1 is

3 is an isometric sectional view of another embodiment of a transfer device,

4 a simplified isometric view of the transfer device of 3 is

5 is a simplified sectional view perpendicular to the axis (xx) of a variant of the transfer device,

6 FIG. 4 is a front view of the inner planetary gear and three satellite gears engaged therewith, FIG.

7 a side view of a satellite wheel of the transmission device according to 5 is

8th an isometric sectional view of a brake booster, which is equipped with a transmission device according to the invention is.

Description of embodiments of the invention

According to 1 the invention has a transmission device 100 to the task, which is intended, the displacement movement of an organ 1 in the direction (xx) in one direction (D) or in the reverse direction (R).

The device 100 consists of a stationary housing 110 , which receives the transmission mechanism from an outer planetary gear 120 , an inner planetary gear 140 and a planet carrier 130 is formed. The outer planet 120 has the shape of a sleeve 121 that with an outer wreath 123 is provided. The planet wheel 120 is stationary in displacement (direction xx) and rotationally free. It has an internal helical toothing 122 on.

The inner planet wheel 140 is non-rotating and free in displacement (direction xx). This inner planetary gear 140 in tubular form is with the controlled organ ( 1 ), it carries a rack 141 in the direction of displacement (xx) of the controlled organ 1 ,

The satellite carrier 130 is with at least one satellite wheel 131 provided with helical toothing. This satellite wheel 131 that is between the outer planetary gear 120 and the inner planetary gear 140 is inserted, engages the inner helical teeth 122 and in the rack 141 one.

The outer planetary gear 120 [or the satellite carrier 130 ] is driven in rotation while the other element, namely the satellite carrier 130 [or the outer planetary gear 120 ] with respect to the housing 110 is stationary. The rotational movement generates the displacement movement of the inner planetary gear 140 that is the controlled organ 1 depending on the direction of rotation, which is to the outer planetary gear 120 or the satellite carrier 130 is created, pushes or pulls.

The outer planetary gear 120 or the satellite carrier 130 is being turned by a motor 2 driven.

Should the outer planetary gear 120 being driven in rotation is the wreath 123 interlocked, and intervenes in the output of the engine 2 either directly or via a gearbox ( 3 ), for example via a reduction gear, a. In this case, the satellite carrier 130 blocked in rotation such that the or the satellite wheels 131 by engaging the rack 141 of the inner planetary gear 140 along a line parallel to the direction of displacement (xx). The rack 141 may consist of a band which is a proportion of the circumference of the inner planetary gear 140 busy. The inner planet wheel 140 has as many bands in the form of a rack 141 on like satellite wheels 131 on the satellite carrier 130 available.

Should the outer planetary gear 120 stationary and the satellite carrier 130 driven in rotation, this ( 130 ) a wreath 123 on whose teeth, which is not shown, from the engine 2 is driven. In this embodiment, the rack occupies 141 of the inner planetary gear 140 the entire circumference of the inner planetary gear 140 ,

2 is a simplified isometric view of the transfer device 100 of the 1 that the outer planetary gear 120 in the form of a sleeve 121 with, at the end, the wreath 123 which can be toothed points. This gearing is not shown. The figure shows the inner helical toothing 122 the sleeve 121 of the outer planetary gear 120 , The inner planet wheel 140 is with a straight rack 141 provided, which is aligned in the direction of displacement (xx). In this embodiment, the satellite carrier 130 rotatably and the outer planetary gear 120 is driven in rotation. The inner planet wheel 140 has only one rack 141 which extends on a longitudinal band of its outer surface flattened thereto.

The satellite carrier 130 is not shown. Only one satellite wheel appears 131 with helical teeth whose inclination of the relative inclination of the helical teeth 122 of the outer planetary gear 120 and the straight teeth of the rack 141 of the inner planetary gear 140 equivalent.

The gears of the epicycloidal mechanism, that of the outer planetary gear 120 , the satellite carrier 130 with his or her satellite wheels 131 and the inner planetary gear 140 with his rack 141 is formed, are a self-locking mechanism, so that only the relative rotation of the outer planetary gear 120 or the planet carrier 130 in relation to the inner planetary gear 140 (Since the other of the two elements is stationary) a displacement movement of the inner planetary gear 140 in one direction (D) or in the other (R) in the direction (xx).

In the transmission device according to the invention 100 as described above and in the other embodiments described below is the helical gear of the satellite wheel 130 (or the satellite wheels) a Schraubverzahnung with the axis (yy), which is that of the satellite wheel. This axis is relative to the axis (xx) of the rack 141 inclined so that upon contact each tooth of the engaged satellite wheel 131 and the tooth of the rack 141 tangent.

In the case of a rack with straight teeth, perpendicular to the direction (xx) or the axis of the rack 141 , as is generally the case, and a satellite wheel whose teeth have a pitch (a) with respect to the axis (yy) of the satellite wheel 131 This axis of the satellite wheel is relative to the axis (xx) of the rack 141 in the complementary angle (90 ° -a) with respect to the axis (xx) inclined.

The 3 and 4 show a second embodiment of the invention transfer device 200 , For the description of this embodiment, the same reference numerals as those of the first embodiment are used, but to 100 elevated. This device 200 differs from the previous one in that the satellite carrier 230 with paired satellite wheels 231 , b is provided. Also exemplary are three pairs of satellite wheels 231 , b, which are distributed at regular angular intervals, provided. The satellite wheels 231 , b grab in the rack 241 of the inner planetary gear 240 and in the inner helical teeth 222 of the outer planetary gear 220 one.

The rack 241 in this case actually consists of three racks in the form of flattened bands, in the direction of displacement (D) of the inner planetary gear 240 are aligned. This version is not mandatory. The rack 241 may also extend over the entire circumference of the inner planetary gear.

This embodiment 200 Like the previous one, it allows driving through the outer planetary gear 220 , where the planet carrier 230 is stationary. In this case, the outer planetary gear 220 with a sprocket 223 provided in the output of the engine 2 through a direct connection or via a gearbox 3 , in particular a reduction gear engages.

According to another embodiment and another mode of operation, this transmission device has a stationary outer planetary gear 220 and a satellite carrier 230 moving in rotation and stationary in shift. The rack 241 of the inner planetary gear 240 extends over its entire periphery.

4 , which is a simplified isometric view, shows by analogy 2 the outer planetary gear 220 with its internal helical teeth 222 and his drive wreath 223 , The toothing of the drive ring 223 is not shown.

This figure shows the three pairs of satellite wheels 231 , b without satellite carrier. These pairs of satellite wheels are distributed at equal angular intervals, and the satellite wheels 231 , b are aligned in the same direction.

In the different embodiments, in the 2 . 4 and 5 are presented, is the inner planetary gear 140 . 240 represented by racks in the form of bands, the flattened bands of the inner planetary gear 140 . 240 which therefore has a polygonal outer cross section, its inner cross section may be circular, as it appears in the figures.

5 to 7 show a variant of the transfer device according to the invention 300 , The sectional view of 5 shows the device 300 with an axis (xx) perpendicular to the plane of the figure; it consists of an outer planetary gear 320 which is analogous to the previous one and of a sleeve 321 with internal toothing 322 and an inner planetary gear 340 that with one or more racks 341a , b, c provided is formed. The planet wheels 320 . 340 take a satellite carrier 330 on that with satellite wheels 332 is provided with both the teeth 321 of the outer planetary gear 320 as well as with the rack 341 of the inner planetary gear 340 engage. The inner planet wheel 340 has a generally hexagonal cross section with three racks 341a , b, c in the form of longitudinal bands having an axis (xx) distributed at regular intervals at an angle of 120 ° around the circumference, with bands therebetween 342a , b, c, which may also be racks.

The teeth of the racks 341a , b, c are transversely oriented and have a curved (globoid) shape, as the arc of a circle, which in the drawing shows the bottom of each tooth 6 extended.

The ones with the racks 341a , b, c interacting satellite wheels 331 are barrel-shaped and correspond to the shape of the teeth of the racks 341a , b, c, to strengthen the contact and thanks to this curved shape to replace the point-like contact of a purely helical toothing of the satellite wheel by a linear contact.

7 shows a satellite wheel 331 of the page. It includes an axle 332 with the geometric axis (yy) and a pinion, with curved helical teeth 333 is provided. These teeth have a tilt (a), so that in the satellite carrier 330 installed satellite wheel 331 an orientation with respect to the axis (xx) of the rack 341 ( 341a , b, c), which corresponds to the addition of the angle of the inclination (a), thus a tangential contact between each tooth 333 of the satellite carrier 331 and the teeth of the rack 341a , b, c is present. This inclination of the axes (yy) of the satellite wheels 331 with respect to the direction (xx) of the racks 341a , b, c appears in 6 , but is in the sectional view of 5 not visible.

As indicated above, the number of satellite wheels can be increased and, for example, one can have two groups of three satellite wheels in the transverse plane, as in FIG 6 to reduce the load imposed on each satellite wheel and to allow it to be made of plastic to reduce costs.

To increase the applied axial force, the satellite wheel groups can also be coupled in series.

8th shows an application of the above-described transmission device in its different versions.

The transmission device 200 , which is illustrated by way of example, but will not be described again in detail, is combined with a braking system of which only the tandem master cylinder 4 is shown. The transmission device according to the invention therefore forms an electromechanical brake booster, that of the engine 2 is driven, whose output via a reduction gear, which consists of the pinions 31 and a small pinion 32 exists, the gearing 224 of the wreath 223 of the outer planetary gear 220 drives. This mechanism receives from the inner planetary gear 240 the control rod 160 , which comes from the brake pedal, and the transmission and thrust detection member on the brake pedal and the control rod 160 , The connection is made by a pressure piston 161 for detecting the movement of the control rod 160 and therefore for detecting the brake request of the driver to operate the brake booster, that is, the engine 2 and the transfer device 200 , continued. The pressure piston 161 acts on the reaction disc 162 one, which itself is the push rod 163 actuated. This latter pushes the primary piston 41 of the tandem master cylinder 4 , The push rod 163 gets in the direction of compression of the master cylinder 4 through an intermediate piston 164 that with the outer planetary gear 220 connected, relocated.

The intermediate piston 164 is from the pressure piston 161 which therefore directly crosses the reaction device 162 can push to the master cylinder 4 in case of failure of the brake booster ( 200 . 2 ).

A return spring 165 pushes the intermediate piston 165 against the wreath 223 of the outer planetary gear 220 back.

LIST OF REFERENCE NUMBERS

1

 Controlled organ

2

 internal combustion engine

3

 transmission

4

 master cylinder

31, 32

 pinion

100

 transfer device

110

 Stationary housing

120

 Outer planet wheel

121

 shell

122

 Internal gearing

123

 wreath

130

 satellite carrier

131

 satellite wheel

140

 Inner planet wheel

141

 rack

160

 control rod

200, 300

 transfer device

210, 310

 Stationary housing

220, 320

 Outer planet wheel

221, 321

 shell

222, 322

 Internal gearing

223, 323

 wreath

224, 324

Dovetailing of the sprocket 223

230, 330

 satellite carrier

231a, b, 331a, b, c

 Satellite wheels / paired satellite wheels

332

 Axle of the satellite wheel

333

 Tooth of the satellite wheel

240, 340

 Inner planet wheel

241, 341

 rack

xx

 Axle of the rack

yy

 geometric axis of the satellite wheel

Claims (7)

Transmission device for controlling the displacement movement of an organ ( 1 ), comprising: - a stationary housing ( 110 ), which accommodates: • an external planetary gear ( 120 . 220 . 320 ) in the form of a sleeve ( 121 . 221 . 321 ) inside with an internal helical gearing ( 122 . 222 . 322 ), an inner planetary gear ( 140 . 240 . 340 ), which is non-rotatable and free in displacement with the organ ( 1 ) and a rack ( 141 . 241 . 341 ) in the direction of displacement (xx) of the organ ( 1 ), • a satellite carrier ( 130 . 230 . 330 ), Wherein the outer planetary gear ( 120 . 220 . 320 ) or the satellite carrier ( 130 . 230 . 330 ) is driven in rotation while the satellite carrier ( 130 . 230 . 330 ) or the outer planetary gear ( 120 . 220 . 320 ) with respect to the housing ( 110 ) is stationary, the device being characterized in that the satellite carrier ( 130 . 230 . 330 ) with at least one satellite wheel ( 131 . 231 . 331 ) is provided with helical teeth in the inner helical teeth ( 122 . 222 . 322 ) and in the rack ( 141 . 241 . 341 ) intervenes. Transmission device according to claim 1, characterized in that the satellite wheel ( 331 ) is barrel-shaped and the rack ( 341 ) has a curved toothing. Transmission device according to claim 1, characterized in that the satellite carrier ( 230 . 330 ) is provided with groups of three circumferentially distributed at regular intervals satellite wheels, and the inner planetary gear ( 240 . 340 ) with at least three racks ( 241 . 341 ), which are aligned according to the translation axis (xx) in order to communicate with the satellite wheels ( 231 . 331 ) to cooperate. Transmission device according to claim 1, characterized in that the satellite carrier ( 230 ) with paired satellite wheels ( 231 , b) is provided. Transfer device according to claim 1, characterized in that the wreath ( 123 ) of the outer planetary gear ( 120 ) with a drive toothing ( 124 ) is provided. Transmission device according to claim 1, characterized in that the inner planetary gear ( 140 ) at least one rack ( 141 ) on a flattened longitudinal band. Brake system comprising a master cylinder and a brake booster, characterized in that the brake booster comprises a transmission device ( 100 . 200 ) according to one of claims 1 to 6, in order to determine the displacement movement of an organ ( 1 ), comprising: - a stationary housing ( 110 . 210 ), which accommodates: • an external planetary gear ( 120 . 220 ) in the form of a sleeve ( 121 . 221 ) inside with an internal helical gearing ( 122 . 222 ), an inner planetary gear ( 140 . 240 ), which is non-rotatable and free in displacement with the organ ( 1 ) and a rack ( 141 . 241 ) in the direction of displacement (xx) of the organ ( 1 ), • a satellite carrier ( 130 . 230 ), which is equipped with at least one satellite 131 . 231 ) is provided with helical teeth in the inner helical teeth ( 122 . 222 ) and in the rack ( 141 . 241 ), wherein the outer planetary gear ( 120 . 220 ) or the satellite carrier ( 130 . 230 ) is driven in rotation while the satellite carrier ( 130 . 230 ) or the outer planetary gear ( 120 . 220 ) with respect to the housing ( 110 . 210 ) is stationary, - a control rod ( 160 ), with the brake pedal and with a piston ( 161 ) connected to a reaction disk parallel to an intermediate piston ( 164 ), the thrust of the inner planetary gear ( 140 . 240 ) is applied, and the thrust movement on the primary piston ( 41 ) of the master cylinder ( 4 ) transmits, - a motor ( 2 ) based on a transmission ( 3 . 31 . 32 ) with the external toothing ( 224 ) of the wreath ( 223 ) of the outer planetary gear ( 230 ) is engaged.

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