DE1650869A1 - Hydraulic clutch booster - Google Patents

Description

JFEl-DR. MÜLLER-BORg DlPL.-lNG. GRALFS DR. MANITZ ¹ ^ "" ¹ ^

June 20, 1967

Fi / Hu - T in9

Alfred Teves, Maschinen- und Armaturenfabrik KG, Frankfurt am Main, Hebstöcker Strasse kl -53

Hydraulic clutch booster I

The invention relates to a hydraulic clutch booster with a piston arranged in a cylinder, a first force transmission path and a second force transmission path, which forms at a certain pressure level in the first force transmission path due to the actuation of a control device caused by this pressure, this control device in the release position the Summary of the ends transmitted via the various routes and from various energy sources. Force β causes and ensures the sole effectiveness of the first power transmission path in the rest position.

It is known to construct hydraulic or pneumatic amplifiers in such a way that the input is at low pressure

109811/0141 -2-

of the amplifier is directly connected to your output and when the pressure rises to interrupt this direct connection by means of a valve control and the output pressure To create leading chamber on the one hand the pressure applied to the amplifier and on the other hand transmit a pressure supplied by an auxiliary power source The pressure at the input of the booster is generally taken from a master cylinder and the auxiliary pressure is supplied from an accumulator.

However, these known arrangements have various disadvantages. In almost all arrangements for supplying the auxiliary pressure within the booster, movable lines are required, which can give rise to malfunctions. Furthermore, spaces exhibiting relatively large pressure differences must be sealed against one another, with the result that high demands must be placed on the seals and considerable wear and tear must be accepted due to these pressure differences. Furthermore, the known amplifiers have relatively large dimensions and are constructive relatively complicated. The production of such amplifiers is therefore associated with considerable costs in many cases.

109811/0343

The aim of the invention is to create a compact constructed, extremely reliable working and large reinforcements enabling clutch booster, the simple and can be manufactured economically.

This is achieved according to the invention in that when the control device is triggered, the first force transmission Vfeg in a first, partly from one side of the piston ^

limited pressure space leads that the second power transmission path in a second, also from a part of this Piston side leads limited pressure space and that the opposite other piston side with the cylinder a de " Forms the third pressure chamber having output pressure.

In one embodiment of the invention, which is in particular characterized by a compact structure, the piston is on the side delimiting the two pressure chambers a central bore is provided, the bottom surface of which is at least partially the boundary surface of the one pressure chamber forms, while the resulting from the drilling ring-shaped surface at the end of the piston as the limiting surface of the other pressure chamber is used.

According to a feature of the invention, which is both a space-saving structure and for multiple use

109811/0343

of components contributes, the piston is provided at the bottom of the bore with a lockable bore leading into the third pressure chamber. ⁼

The piston thus serves in addition to its actual puncture the power transmission also as a valve holder and sealing " element.

An embodiment of the invention, which the "/ er h-icht vou allows trouble-prone hose lines is characterized in that the power transmission paths at least partially inserted in a fitting in the cylinder and run with it connected guide body and as Bores are formed »

A special embodiment of the invention is the second pressure chamber from the wall of the cylinder, the annular one Area of the displaceable piston and the ■ transition area between "the part resting on the cylinder and the part of the guide body that engages in the bore educated.

Because of this arrangement of the second pressure chamber, it becomes nebeu a flawless management of the in this room pressure moving "piston is also possible

-5-

10 9 8-11 / 0 34 3 bad original

created the mutual union of the origin; he parted Pressures leading. Häunie in extremely beneficial Way to make. '■ -.-.

Namely, according to a further feature of the invention, "c". the second pressure chamber against the third pressure chamber by means of one arranged between the cylinder wall and the Ko.Iben Seal sealed. ™

Since the pressure supplied by the auxiliary pressure storage device is in the second pressure chamber and the sum of this pressure and the pressure generated by the coupling transmitter in the first pressure chamber prevails in the third pressure chamber, this seal is only exposed to the differential pressure of the two chambers. The consequence of this is that it is only subjected to very little stress and is therefore subject to only little wear. ' _v |

In a further embodiment of the invention, which allows the avoidance of screw connections and leads to a compact structure, the! "ührungskö'rper a continuous bore concentric to the piston bore, which in the area of the part pushed into the piston bore ensures the guidance of the control piston

109811/0343

'First cross-section and then a guide of the control valve serving second cross section.

In a particularly advantageous embodiment of the invention is the first pressure space from that in the guide body

provided bore with the first cross-section, the control piston, the bottom surface of the piston bore and a valve element arranged between a first and third pressure chamber limited.

Due to the large contact areas between the == Piston fitted guide body and in the guide · = body fitted control piston becomes a flawless and A secure seal between the rooms carrying the auxiliary pressure and the room is achieved, eLaiv the one at the amplifier input applied pressure; having-·-.

⁼ In an advantageous embodiment, the control valve actuated by the control piston is designed as a cylindrical hollow body which, on the side opposite the control piston, has a reduced outer diameter over part of its length and then a funnel-shaped widening end part.

According to the invention leads into the cylindrical hollow

109811/0343

body ι lit clera reduced diameter and the bore wall formed narrow space a pressure line. A the funnel-shaped widened end part of the control valve surrounded space is with the second pressure chamber via a Line connected. With this arrangement, a valve is created, which is also possible when using large auxiliary pressures is only used very little.

In a particularly advantageous embodiment, the characterized by simplicity and operational reliability, there is a bore in the control piston on the control valve side provided, the diameter of which is slightly larger than the outside " diameter of the control valve is, and this bore is at least partially filled with an "elastic material. ■ ■.

Since the control valve in the control piston bore in this Embodiment is retractable, is extraordinarily ' simple V / ei se get a controllable passage, which is a free one when the control valve is in the rest position Connection between the cavity of the control valve and a return line ensured and by pressing the Control valve can be locked to the plastic material.

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10 9 811/0343

Further details and advantages of the invention are provided shown below with reference to the drawing; in this show:

Fig. 1 is an axial longitudinal section of a hydraulic Coupling amplifier according to the invention and

Fig. 2 is a plan view of the single entry side of the in Fig. I illustrated amplifier.

According to FIG. 1, the housing of a clutch booster is formed by a cylinder 17 open on one side, part of a guide body 25 and an end flange part 39. These three elements are arranged concentrically and are held together by screws UrZ _t which run parallel to the axis of the arrangement and are screwed into bores k>% of the cylinder 17. A bead ring-shaped seal 46 is provided between the guide body 25 and the cylinder 17 and a seal 38 is provided between the guide body 25 and the end flange part 39.

The end flange part 39 has in the upper part a to Connection to a clutch transmitter suitable opening 1 and in the lower part one for connection to a pressure accumulator suitable opening 9 and a return opening 53.

1 098 1 1/03 A3 ~ ⁹ ~

1S50BS9

To create a good confirmation option for / incoming lines, this is; A ^ end flange part 39 ^; is provided with a shoulder 52. The van den Msanlußöffnungem / ^ mission paths egfuhrenden Kraf tover, or bores running in the en Fuhrungskörper- 2.5 _¥ wherein on the tjbergangsst rush between the Fünrungskörper · and the Abschlußflanschiteil you 'obligations as ^ S are arranged ,,

The amplifier output 2 is located on the bottom of the cylinder; Although / provided 17 _r and approximately opposite the · Eingangaoffnung 1. The · cylinder I7 at the site of Ausgangsöffnung- 2 with a neck 5 ^ _"g in which a serving for fixing a leading to the Eupplungsnehmer line threaded 3sb attached. On the open end if the cylinder I7 has a larger wall thickness _t around the screw connection with the

TO

closing flange part 39 and the guide body 25 / allow.

The guide body 15, which is concentric with the cylinder, is also cylindrical and has three displaceable diameters. The diameter of the part of the guide body resting on the cover flange corresponds to the outer diameter of the open end of the cylinder 1, and this is followed by the next section of the Guide body, the cross-section of which corresponds approximately to the opening cross-section of the cylinder. This part of the guide body is

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t Q 9 a11 / 0 3 43

so -in. The cylinder fitted "Dei" diameter of the third section of the guide body 25 corresponds to the inner diameter of a bore 22 ₁ in one in the cylinder

1? displaceable piston 11 is provided., The piston 11 is thus on the one hand on the inner wall, de "cylinder Vf and on the other hand on the outer wall of the third part of the guide body 2.5"

Because of the bore 22, the piston 11 has an annular surface Zj on the side facing the guide body. and a circular bottom surface 19. A bore 49 for receiving a valve is provided in this bottom surface. For this purpose, the end of the piston opposite the outlet opening 2 is provided with an Änsäz 55 , which at the same time serves as a holder for a compression spring 34, which between the piston and. the bottom surface 33 of the cylinder 17 is arranged in order to bring the piston 11 back into the starting position.

The Pührungskörper 25 has a con- with the cylinder ^I7: upon central bore with unterachiedllchen cross sections. At the end facing the piston head 19, the cross-section of the bore is selected so that a disk-shaped retaining element 35 having openings 48 by means of a spring ring 4? can be attached. This retaining element

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iasai1 / 0343

-U-

is provided in the center with a pin-shaped projection which engages into the provided in the piston head I9 bore and presses against the bearing on a spring I3 valve ball 12th The diameter of the valve ball is so counted that this ball the. Bore 2 * 1- can close. A support ring 50 held by a spring ring 51 is provided in the enlarged bore 49 of the piston attachment 55 as a counter bearing for the spring I3. Ä

Subsequent to the holding element 35, the cross section of the bore of the guide element 25 widens in shape a recess running conically into an annular groove. This recess is via a first force transmission path Representative bore 18 is connected to the inlet opening 1.

A bore closes on the annular recess 32 whose cross-section is slightly smaller than the cross-section lying in front of the recess 32. In this hole a control piston 3 is slidably arranged. That the amplifier output facing end of this piston engages in the between the holding element 35 and the beginning of se ine s guide cross-section located room.

Thus, a with the opening 1 via a bore 18 in

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109811/0343

Connected and lockable by a valve ball 12 The first pressure chamber 15 is formed by the wall of the bore provided in the guide body 25, the control piston 3 and the bottom surface 19 of the piston bore 22 is limited is.

One that can be connected to the auxiliary pressure line 7 via a bore 20 second pressure chamber 10 is of the wall 28 of the cylinder 17 ", the annular surface 23 of the displaceable Piston 11 un ·· "Ver transition surface 29 between the formed on the cylinder abutting part and the engaging in the bore 22 part of the guide body 25 .. The the annular surface 23 of the displaceable piston 11 opposite transition surface 29 is designed so that there is always a free one between these two surfaces Space is available.

, -Cs-C-

The first pressure chamber 15 is through from the second pressure chamber 10 a seal 27 separated, which is mounted in an annular groove provided in the guide body 25 / is.

third
The / pressure chamber Ik ₁ , which is delimited by the cylinder wall 28, the piston output side 21 and the valve element 12 and has the output opening 2, is sealed from the second pressure chamber 10 by a seal 30, which is shown in FIG

■ - -13-

1098 11/0343

one in the basket 11. vorgasehemmi eingnuJr arranged "Isdb: und presses against the cylinder wall ".

39 a Boiteuag with less; s; to DIE the spool 3 fÄrende bore · closes towards de "Äfes;cnluJ3fO; AKAG ^ partly Cross-section at ,. in which a S: tei ^ rveii.til '5 v. © r.- ~ delegated' isir. ßi.es: e, s StieuejPventil: 5 is as

HolilJtekörper formed, the. at. the capital duty on waste d schlußflansohtBil sugewanilt-en Page :: on part of its length reduced ÄußendRrchm ^ sseTr and because then one is trlchterf shaped manner expanding: Endfeeil 36 ■ aufweistv in connection with the!. the control valve 5 fülarendö bore is the cross section: the bore going through the guide body is enlarged, so that a; Space is created .8, of the funnel-shaped end portion 36 aufnimmtv

The space 8 is closed by the end flange part 39- " sen, for this purpose with a sleeve-shaped approach is provided, the provided in the guide body 25 in the Hole engages. To seal the space 8 is in a a seal 38 provided in the wall of the bore groove arranged, which rests on the sleeve-shaped extension 56.

The funnel-shaped extension J6 of the control valve 5 is of

one. Compression spring S. against the ^: transition edge between, the V "eiitil £ üIirungBl> Qiirung and deBL fiainl · 8- printed The part of the control valve body is limited, which has a reduced diameter and adjoins the inter-shaped egg duct .. A honing run through the liner body 25 and the duct 39 leading to the honing; 7 The end of this head is guaranteed to be: 37 and a pressure source. The EauDL, which can be separated from the room 37 by the control valve 5, is connected to the two pressure chamber 10 by a junction 20 at the end.

To seal the space 57 against the dea Control piston 3 serving space .ist in the guide body approximately in the middle of the Steuerventllhohrung "an Einnulr provided, in which a seal 4 ^ is arranged, the is applied to the control valve 5.

The end of the control valve facing the control piston 4 , has a decreasing wall thickness and engages in a bore 39 provided in the control piston. These Hole 39 is to the rope with a acting as a seal ~ Stuffed the elastic material · This material is 4-is compressible and ensures a separation: the

Valve cavity 40 from a return line 16. Is that true

plastic material 4 is not under pressure, so is a connection between the valve cavity 40 and the return line 16, since the diameter of the bore 39 in the control piston 3 is slightly larger than the outer diameter of the control valve 5 is. -

The valve cavity 40 and the return line 16 are f against the first pressure chamber 15 by means of a seal 31 sealed, which is arranged in an annular groove provided in the control piston 3 and on the wall of the control piston guide serving hole is applied »

In FIG. 2 it can be seen that the end flange part 39 is designed approximately in the form of an equilateral triangle with rounded corners. In the corners of the triangle of the hydraulic booster serving openings 41 are for fastening provided * The cohesion of the Abschlußflanschteiles 39, CLÉS guide body 25 and the cylinder guaranteeing screws 42 of the triangle sides opposite to a fastening opening 41 of the Abschlußflanschteiles angeordnet.Das are each also about in the middle in the extension part 52, which is designed in the form of a triangle, has the connection opening 1 for the line coming from the clutch transmitter, which is used to connect the return line

10981 1 / 0-343.

Opening 53 and the connection for one of an auxiliary pressure source coming line serving opening 9. The single ones Openings are arranged corresponding to the mounting holes 41. The course of the tree 8 with the second pressure chamber 10 connecting bore 20 is in this Fig. 2 indicated in a straight line.

w In the following, with reference to FIG. 1, the Operation of the hydraulic booster according to the invention shown.

Input 1 of the hydraulic booster is in quiescent division with the output 2 via the bore 18, the first pressure chamber 15, the valve bore 49 and the third pressure chamber 14 connected. It follows that the amplifier is always is ready for use. When the clutch lever is actuated, the pressure medium generated by the clutch transmitter is generated Transfer pressure to the clutch slave via the connection described. If the pressure rises as a result of a on the slave cylinder occurring mechanical resistance in the entire system, the control piston 3 is in the direction of the end flange part 39 moved so that the elastic material 4 on the face of the control valve 5 sits sealingly and this against the force of the spring takes off from his seat. The one located in room 37

-1? - 1098 1 1/03 A3

and pressure medium connected to the auxiliary pressure source can now enter the tree 8 and then pass through the bore 20 into the second pressure space 10. The pressure now present in this space moves the piston 1, 1 in the sighting 12 closes the passage 2 k due to the action of the spring I3.

The separation of the third {((

Pressure chamber Ik from the first pressure chamber 15 has the consequence that now in the third pressure chamber Ik connected to the clutch slave, a pressure is created which represents the sum of the pressures that become effective in the first and second pressure chambers V. The force transmitted from the first pressure chamber to the piston 11 comes from the clutch transmitter and the force exerted on the piston II in the second pressure chamber comes from the auxiliary pressure cylinder,

When the pressure Wii> d the calves 11 are reset by the spring 3k, the control valve 5 separates the tree 37 from the tree 8, whereby the auxiliary pressure supply is interrupted, and the second pressure chamber 10 is via the bore 20, the tree 8, the valve cavity ^ O and the Steuerko} .benbohrung 39 connected to the return line 16. The coupling amplifier is thus again in its output division, with the input being connected to output 2 via the bridge means.

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109811/0343

It is ofiOnsl & htllcii that oils reinforce the system a relationship between the different and the coming into effect

Druckfla iron depends. Taking into account the available IiO-fedru © l &s', the βτ £ IHdUHg ⁷ Sg ^ EIHaBe clutchBv ^ strengthened by gselgnetB Vtektl of this pressure bar can optimally dliirens: ionlert

HäliEsiänrck wirjä vörzHgsWdiKiSäe of

known kind geliedT © rt, weashsr lotBlssmuiLioh. with high pressures up to .3 ^ Q atü works.

-Patent claims -19-

10-98 Tt / 03 4 p

Claims (1)

Claims 1. Hydraulic clutch booster with a piston arranged in a cylinder, a first force transmission path and a second force transmission path, which is formed at a certain pressure level in the first g force transmission path due to the actuation of a control device caused by this pressure, this control device in the release position ment the summary of the -various Ways are transmitted and the forces coming from different energy sources are effected and in the rest position the sole effectiveness of the first power transmission path guaranteed, characterized in that that when the control device is triggered, the first power transmission path in a first, partially I. from the one piston side (19) bounded pressure chamber (15) leads that the second power transmission path (20) leads into a second pressure chamber (10-) also bounded by a part of this piston side (19) and that the opposite other side of the piston (21) with the cylinder (1?) has an output pressure third pressure chamber (14) forms. . 10 9811/0343 2. Hydraulic clutch booster according to claim 1, characterized marked that the piston (11) on the side delimiting the two pressure spaces (10, 15) ″ has a central bore (22), the bottom surface (19) of which is at least partially the boundary surface of the one Pressure chamber (15) forms, while due to the bore The resulting annular surface (23) at the piston end serves as the boundary surface of the second pressure chamber (10). 3. Hydraulic clutch booster according to the claims 1 and 2, marked by the fact that the Piston (11) at the bottom of the bore (22) has a lockable bore (24) leading into the third pressure chamber (14) having. ■ 4. Hydraulic clutch booster according to claim 1, characterized in that the control device consists of a displaceably arranged control piston (5), one end of which ⁼ a boundary wall (26) of the first pressure chamber (15) and the other end of which forms a preloaded control valve ( 5) actuated. 5. Hydraulic · clutch booster according to the preceding Claims, characterized thereby, 1098 11/03 A3 T65Q869 that the power transmission paths (18, 20) at least; ens partially in a close-fitting in the cylinder (1?) new and associated with it the leadership bodies (25} run and are designed as bores. .6. Hydraulic clutch booster according to claims 5 and T »characterized GEK en η ζ calibration net that the front 'of the cheap rate (? 1) inserted into the cylinder i? Ührungs ~. ™ body (25) has a somewhat smaller cross-section than the KoI -benboiirung (22) and engages in this bore. 7 · Hydraulic clutch booster according to claim 6, characterized geke η η ζ η et verifiable that between the front 'of the i'eil. Bührungskörpers (25) and it. A seal (27) is provided around the edge of the bore (22). 8. Hydraulic clutch booster according to claims i 1,. 2, 5 and 6, thereby ge k e η η ζ e i c h η e t, that the second pressure chamber (10) from the wall (28) of the Cylinder (17) »cLer annular surface (23) of the sliding Piston (11) and the transition surface (29) between the part resting on the cylinder and the part in the Bore (22) engaging part of the guide body is formed. 1 O 9 & 117 0343 ~ 22 ~ 9. Hydraulic clutch actuation? after. Claim 3 ,. thereby g e k e η η ζ. e ic h .. n. e t, because J between the transition surface (29) and the annular surface (23) there is always a gap., tQ. Hydraulic clutch booster according to claims 1, 2, -3 and 8, thereby geke η η. draw η. e tr _r that the second pressure chamber. (10) is sealed against the third pressure chamber (1 ^) - by means of a seal (30) arranged between the cylinder valve (20) and the piston (11). 11. Hydraulic clutch booster according to the preceding claims, characterized marked η et that, the Pührungskörper (25) has a continuous, to the piston bore (22) concentric bore, the guide of the control piston in the region of the inserted into the piston bore part (3) ensuring first cross-section and then a second cross-section serving to guide the control valve (5). 12. Hydraulic clutch booster according to claim 11, characterized in that the slidable in the bore with the first cross-section: - control - * -. 1Ö9811 / 0343 The piston (3) rests against the wall of the bore ßingdihtung (3I) is provided «, 13 Hydraulic clutch booster according to the preceding claims, characterized in that that the first pressure, (I5) from that in the funnel-body provided bore with the first cross-section, the "control piston (3), the bottom surface (I9), the piston bore (22) and one between the first and the ^ third pressure chamber arranged valve element (12) is limited. 1 * 1 ·. Hydraulic clutch booster according to the claims 11 and 13, thus g e k e η ηζ ei c h η e t, that the hole provided in the guide body with - (19) the first cross section on the one facing the piston crown / End through an annular recess that continues conically in the direction of the piston head (32) is expanded, in which the first power transmission path (18) leads. 15. Hydraulic clutch booster according to the previous ones Claims, characterized thereby ζ ei c h η e t, that the third pressure chamber (1 * 1 ·) from the cylinder wall (28), the piston outlet side (21) and a valve -2 * 1- 1 0 98 11/034 3 BATH element (12) limited 1st and a pressure outlet opening (2). 16. Hydraulic clutch booster according to the preceding claims, characterized in that in the third pressure chamber (14) one between the piston (11) and the cylinder base (33) arranged and ensuring the return of the piston Compression spring (34) is provided. 17. Hydraulic clutch booster according to claims 1, 3, 13 and 15 »thereby geke η η ζ ei ch η et that the valve element arranged between the first pressure chamber (15) and the third pressure chamber (14) consists of a by means of a compression spring ( I3) preloaded and fixed in position by means of a retaining element (35). ■ λμ ;;: - 18. Hydraulic clutch booster according to claim 1 ?, characterized in that the compression spring (13) in the third pressure chamber (14) and the holding element is arranged in the first pressure chamber (15). 19. Hydraulic * clutch booster according to the claims 1, 4 and 11, marked thereby, 10 981 1/0343. ~ ²⁵ ~ that the control valve operated by the control piston (5) (5) is designed as a cylindrical hollow body, the on the side opposite the control piston a rope its length has a reduced outer diameter and then has an end part (56) widening in the shape of a funnel. 20. Hydraulic clutch booster according to claim 19? da- ™ by ge k e η η a ei without t that in the of that cylindrical hollow body with the reduced diameter and the bore wall formed tree (37) a Pressure line (7) leads. . 21. Hydraulic clutch booster according to the preceding claims, characterized geke η η ζ eich η et that the funnel-shaped widened end part (56) of the control valve (5) is arranged in a tree (8) which is linked to the second | Pressure chamber (10) is connected by a bore (20). 22. Hydraulic clutch booster according to claim 21, thereby g θk e η η ζ e i c h η e t that between the funnel-shaped end part (56) and the bottom of the hood (8) a compression spring is attached, which End part against the im.guide body (25) for control 10 9 8 11/0343 16S ventilführiMg provided hole presses and closes the annular tree (37). 23. Hydraulic coupling booster according to the previous ones Claims, thereby g e k e η η ζ e i c h n e t that in the control piston (3) on the control valve side a bore (39) is provided, the α diameter slightly larger than the outer diameter of the . Control valve (5) is, and that this bore at least is partially filled with an elastic material (4). 24. Hydraulic clutch booster according to claim 23, thereby g e k e η η ζ e i c h η e t that the control valve (5) can be pushed into the control piston bore (39). ™ 25. Hydraulic clutch booster according to the previous ones Claims, characterized thereby that when the control valve (5) is in the rest position there is a free connection between the cavity (40) the control valve and a return line (16) which can be blocked by pressing the control valve (5) against the elastic material (41). -27- 1098 11/0343 26. Hydraulic clutch booster according to the preceding Claims, characterized g e k e η η ζ e rejects that the guide body (25) of one with the cylinder (17) screwed end flange part (39) is held, which the connections for the two Has power transmission paths and the return and partially expanded to accommodate the funnel-shaped End part (36) of the control valve (5) serving tree (8) limited. 27. Hydraulic clutch booster according to the preceding claims, characterized in that a hydraulic pressure accumulator with pressures between ...? 9. * and j5J5P. * Atü is used as the auxiliary pressure source. 109811/0343