DE1188964B - Power steering device, in particular for motor vehicles - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. GL:

B62d

German KL: 63 c - 47

Number: 1188 964

File number: Z 986111/63 c

Filing date: January 19, 1963

Opening day: March 11, 1965

The invention relates to a power steering device, in particular for motor vehicles that separately is arranged by the steering gear between the vehicle frame and the steering linkage, the Servomotor, the pressure medium control and the transmission elements connected to the steering linkage consist in parts arranged coaxially to one another and connected to one another.

In a known power steering device of this type, the control slide is in a Control valve housing used bushing, in each of both ends an axially directed bore is incorporated, while the connecting lines of the pressure medium control device outside the Control valve housing lie. Such holes in the control valve housing or in an inserted sleeve however, require a considerable amount of work in terms of their production and must be with the help bores extending radially inward from the outside are connected to the corresponding control grooves are, with these radially directed bores closed again to the outside in a liquid-tight manner Need to become.

It is another steering device with an auxiliary power generating, through one of the steering column actuated spool controlled piston drive known, the steering column enclosing Slide pipe sits on an intermediate pipe. The slide tube in turn is of the with includes the steering gear housing firmly connected spool housing. This spool housing has several bores that work together with ring grooves machined in the slide tube and are connected to pressure medium supply and return lines. The to the Cylinder chambers leading supply and return lines are outside of the housing, and are also the connecting channels for the return lines outside the control valve or steering gear housing arranged.

Such an arrangement of the connecting lines is, however, with a view to the risk of damage especially for steering devices in which the servomotor is installed separately from the control slide is, and extremely unfavorable in steering devices according to the invention described here.

The invention is based on the object of improving power steering devices both in terms of a simpler design and in terms of smaller dimensions and of avoiding the disadvantages of the known devices. According to the invention, this is essentially achieved by using a power steering device, in particular for
Motor vehicles

Applicant:

Gear factory in Friedrichshafen
Aktiengesellschaft, Friedrichshafen

Named as inventor:

August Good,

Martin Bader, Schwäbisch Gmünd

that a member of the pressure medium control device consists of at least two firmly connected, There are concentrically arranged parts that are attached to the converging Bohrungsbzw. Casing surfaces extending axially and in this direction closed off to the outside, formed by longitudinal grooves or annular depressions Have connecting channels.

Another feature of the invention is that the control valve housing is a permanently inserted Contains sleeve for receiving the control slide and that in the bore surface of the housing and / or the outer surface of the sleeve in the axial direction closed off to the outside, by annular Connection channels formed by recesses or longitudinal grooves for establishing a connection between the pressure medium supply groove and the pressure cylinder space and between the pressure medium return control grooves and the common return line are incorporated.

Furthermore, a feature of the invention is that the outer surface of the sleeve at least one has further longitudinal groove for connecting the reaction space with the pressure medium inlet.

With the design of the control valve according to the invention it is achieved that it is difficult to manufacture long axial bores in the control valve housing and radially directed bores to be machined from the outside Connection holes to be shut off from the outside can be dispensed with. In addition, external, Pipelines leading to the pressure cylinder chambers with the associated connections and seals

50 gen.

Two exemplary embodiments according to the invention are shown in the drawing.

509 518/256

F i g. 1 shows the power steering device in connection with part of the vehicle in a side view, shown schematically;

FIG. 2 shows the power steering device according to FIG. 1 in plan view;

F i g. 3 shows the power steering device in a longitudinal section;

F i g. 4 shows a further exemplary embodiment in a detail, shown in longitudinal section;

F i g. 5 shows a longitudinal section according to FIG. 4;

F i g. 6 shows a section along the line VI-VI in FIG. 4;

FIG. 7 shows a cross section along the line VH-VII in FIG. 4.

The embodiment shown in the drawing shows a between a fixed point on Vehicle frame and the linkage of the vehicle arranged power steering device.

In Fig. 1 and 2 is denoted by 2, the steering spindle carrying the steering handwheel 3, which is via the steering gear 5 of the usual design and the steering column arm 8 fixed on the steering shaft 7 via the auxiliary steering device 6 with the linkage 10 is in driving connection. The steering linkage 10 is known Way connected to the vehicle wheels 9 to be steered, the pitman arm 8 being articulated on the housing 12 forming the auxiliary power cylinder or on the housing 14 combined with this for the pressure medium control device attacks. Furthermore, on the housing 14 for the pressure medium control a further housing 18 for receiving that which is connected to the pitman arm 8 Ball pin 20 (F i g. 3) attached.

As the F i g. 1 to 3 can be seen in the auxiliary power cylinder 12 is a double-acting auxiliary power piston 25 arranged, the piston rod 26 of which is hinged to a fixed point 27 of the vehicle frame 28 is. By means of the auxiliary power piston 25, cylinder spaces 30 and 31 are provided in the auxiliary power cylinder 12. The cylinder 12 is formed by a tubular part that is connected to a tube 12 concentric pipe part 32 produces an annular inlet space 33 to the cylinder space 31.

The control valve housing 14 includes a central axially directed bore 35 which is for receiving a to control the pressure medium to one or the other cylinder chamber 30 or 31 conducting control valve slide 36 serves. For this purpose 14 annular grooves are in the bore 35 of the control valve housing 37, 38 and 39 incorporated, which are formed with corresponding ones on the control valve slide 36 Counter grooves 40 and 41 work together. The annular grooves are arranged in such a way that the feed grooves that are connected to the pressure generator are arranged between the two annular grooves for the pressure medium return. The two seals 37 'and 39' on the control valve slide therefore only need to seal against low pressure. In the ring groove 38 opens the inlet channel connected to the pump pressure line (not shown), while the Annular groove 37 with the to the return line, which leads to the pressure medium reserve tank, not shown, connected return duct is in communication. The annular grooves 40 and 41 are in turn each to one Supply channel 46 and 47 opening into the cylinder chamber 31 and 30, respectively, are connected. Concentric to the bore 35 is in the control valve slide 36 an axially directed bore for receiving a Sleeve 48 incorporated. The bore in the control valve slide 36 is on a part 50 and the sleeve 48 executed on a part 51 of their diameter offset, so that between the bore part 50 in the Control valve slide 36 and the stepped part 51 of the sleeve 48 an annular space 54 is formed. The latter stands over a plurality of radially directed bores distributed over the circumference of the control valve slide 36 55 and 56 with the annular grooves 37 and 39 in the control valve housing 14 in connection.

Advantageously, axial and radial bores that are difficult to produce can be achieved by this design for the return of the pressure medium to the reserve tank in the control valve housing 14 are omitted.

The control valve slide 36 receiving bore 35 is through an intermediate wall 63 of the Housing closed and forms a space 58. The sleeve 48 has an opening into the space 58 axial bore 57 to which a corresponding axially extending through the control valve slide 36 and discharge line 59 leading to the outside is connected.

Between the bore part forming an extension of the bore 35 in the control valve housing 14 and that which extends to the ball pin 20 and is connected to the latter via ball sockets 60 and 61 Control valve slide part is a reaction space 62 is formed in which one under certain Bias standing compression spring 64 is used. The reaction space 62 protrudes a channel with the pressure medium inlet in connection. In bore 35 and on the control valve slide 36 are shoulders 67 and 68, respectively, for the installation of a loosely pushed onto the control valve slide 36 Ring washer 69 formed, while on the opposite side a fixed to the housing 14 Disc 70 and a loosely displaceable ring part 72 supported on this disc 70 are present with the preloaded spring 64 inserted between the part 72 and the washer 69. Through the prescribed device fixation of the control valve slide 36 in its neutral position is achieved. A loosely pushed onto the control valve slide 36 rests on a shoulder 73 of the ring part 72 Disc 75, between the end face 76 and a shoulder 77 interspace provided on the control valve slide 36 or on the disk 70 is left. A disk 79 inserted into an annular groove on the control valve slide 36 is between the Clamped holder 78 for the ball pin 20 and the ball sockets 60 and 61 and establishes the connection between the ball pin 20 and the control valve slide 36. Between washer 79 and disc 75 is a spacer sleeve 79 'loosely placed on the control valve slide. Between the holder 78 and the housing 18 there is axially in both directions a control clearance corresponding to the control clearance Gap formed.

The mode of operation of the device is described as follows:

The pressure medium is supplied from a pressure source (not shown) via a pressure medium supply line and the pressure medium supply channel in the control valve housing 14 is supplied to the annular groove 38. From there The pressure medium reaches the neutral position of the control valve slide 36 via the annular grooves 40 and 41 into the return grooves 37 and 39 and from there

Claims (1)

5 6 out into the return channel, which is connected to the pressure medium in its neutral position. The space 98 in front of the tax reserve tank connected. The valve slide 90 in the annular space is via a central bore 116 39 located pressure medium passes through the relieved to the outside. radial bores 56 in the control valve slide 36 in addition, axially directed grooves 117 are zwiden Annular space 54 and over the radial bores 5 see the circumferential surface of the control valve slide 55 into the return annular space 37, which is reserved for the reserve 90 and the housing 80 on the sleeve 81 leads. seen, the radially directed bores 118 If, for example, the control valve slide 36 and 119 is connected to the annular grooves 91 and 93, respectively adjusted to the right, the annular groove 41 is against. These grooves are about the annular groove 91, the the pressure medium supply completed, and the io bore 105 ', the groove 105 and an opening Pressure medium reaches the pressure medium reserve container (not the channel) via the annular groove 40 and the 120 46 placed in the annular space 33 between the two) connected. Pipe parts 12 and 32 as well as a not shown. The operation of the device is as shown Bore in the cylinder chamber 31. Described immediately below: This can be timed out of the pressure cylinder space 30 via the pressure medium supply 107 of the Forced pressure medium via the channel 47 to the annular groove, annular groove 92, pressure medium supplied and for example 41 flow off and is staked to the right via the annular groove 39, the drilling manner of the control valve slide 56, the annular space 54 and the bore 55 pushed, the pressure medium arrives from the ring Return ring groove fed. groove 92 into the annular groove 94 and from there over the rain in the same way, the pressure medium 20-dialen bores 100 and the axial grooves 99 and the control device with opposite adjustment radial bores 99 'in the annular space 85 and so Control valve slide 36 to the left. with in the cylinder space 87 in front of the assistant the F i g. 4 to 7 is a further execution piston 88. The pressure medium from the cylinder space example shown according to the invention. In this 86, the Bohrun embodiment can use the axial grooves 101 consists of the control valve slides 101 ', the annular grooves 95 and 93 and the radial About receiving housing made of two parts, namely bores 119, the axial grooves 117, the radial is in the bore of the housing 80 a sleeve 81 bores 118 and the annular grooves 91, the radial firmly inserted. Here, too, are two concentric, bores 105 'and the recess 105 over the fixed pipe parts 83 and 84 are present on the housing 80, opening 120 to the pressure medium reserve container zudie between them an annular space 85 for the. Flow back. At the same time builds up over the pressure guide of the pressure medium in the cylinder chamber 87 medium supply 107 and the axial grooves 106 as well lock in. The auxiliary power piston is here with 88 the bores 112 in the reaction space 108 of the and the second cylinder space is designated by 86. The pump pressure on. The same effect results Bushing 81 on the control valve housing 80 has a retainer when the control valve slide is displaced Bore 89 for receiving the control valve 35 90 to the left. The pressure medium then passes from the Slide 90 is used. In the sleeve 81 for control pressure medium supply 107 from the annular groove 92 in tion of the pressure medium to one or the other cylinder the annular groove 95 and via the bores 101 'and linder space of the auxiliary power piston annular grooves 91, 92 the axial grooves 101 to the cylinder space 86 before and 93 incorporated, with the corresponding counter-piston 88. At the same time, this can be done from the cylinder grooves 94 and 95 on the control valve slide 90 to 40 space 87 displaced pressure medium via the annular space work together. There are on the control valve slide 90 85 and the bores 99 ', the axial grooves 99, the Seals 117 'and 118' are provided, which against bores 100 and the annular grooves 94 and 91 as well the low pressure occurring in the return grooves seal the bores 105 'back to the reserve tank, flow. The sleeve 81 has an end wall 97, 45. For this embodiment, the control valve through which the cylinder space 86 opposite the housing only for the supply of the pressure medium in Control valve slide closed and a space 98 the cylinder space 87 one or more radial, of There are holes to be machined outside between this wall and the control valve slide. All is formed. In addition, there are other bores in the circumferential surface, as they are in the known the sleeve 81 incorporated longitudinal grooves 99, which are required over 50 directions, are omitted as a result of radially directed bores 99 'and 100 a two-part design of the control valve housing, connection to the pressure cylinder chamber 87 or to the ring. produce groove 94. Likewise, grooves 101 are incorporated into the housing, are axially straightened seen, the grooves replaced directly in the pressure cylinder space. It is thus also a final 86 open out and via radially directed bores 55 ßen the machined from the outside into the housing 101 'with the annular groove 95 on the control valve slide 90 holes avoided. stay in contact. A bore 107 radially in the dem features the axially directed and in the sleeve 81 is with the annular groove 92 and with its extension leading to the outside bore Pressure medium supply line in connection which is intended to claim 5 contained in the control valve slide a pressure medium pump is connected. These 60 only apply in connection with the main claim Bore 107 is about a longitudinal groove 106 and about to come. the bore 112 with the reaction space 108 in claims
constant connection. The reaction space is used for Recording a stand under a certain bias- 1. Power steering device, in particular for the compression spring 113, which is attached to two centering discs 65 motor vehicles, which are separated from the steering gear ben 114 and 115. The two panes lay between the vehicle frame and the steering is arranged with their shoulders on opposite shoulders of the linkage, whereby the servomotor, housing and center the control valve slide 90, the pressure medium control and the steering Linkage connected transmission members are housed in coaxially arranged and interconnected housing parts and at least one of the members of the control device consists of several interconnected parts, characterized in that a member (14, 80) of the pressure medium control device consists of at least two firmly connected, concentrically arranged Parts (36 and 48 or 80 and 81) consists of connecting channels formed by longitudinal grooves or annular recesses (54 or 99, 101 and 106) which extend axially on the meeting bore or jacket surfaces and which are closed to the outside in this direction exhibit, 2. Power steering device according to claim 1, characterized in that the control valve housing (80) contains a permanently inserted sleeve (81) for receiving the control slide (90) and that in the bore surface of the housing (80) and / or the outer surface of the sleeve ( 81) connecting channels closed off in the axial direction to the outside and formed by annular depressions or longitudinal grooves (99, 101 and 106) for establishing a connection between the pressure medium inlet groove (94) and the pressure cylinder chamber (87 or 86) and between the pressure medium return control grooves (91 and 93) ) and the common return line are incorporated. 3. Power steering device according to claims 1 and / or 2 with a reaction device containing reaction chambers, characterized in that the lateral surface of the sleeve (81) has at least one further longitudinal groove (106) for connecting the reaction space (108) to the pressure medium inlet (107) . 4. Power steering device according to claim 1, characterized in that in the bore surface and / or the lateral surface of the firmly together connected parts (36 and 48) of the pressure medium control device at the meeting Places connecting channels (54) closed off to the outside in the axial direction by means of annular recesses or longitudinal grooves are formed, which via openings (55 and 56) a connection between the return control grooves (36 and 39). 5. Power steering device according to claims 1 to 4 or one of these claims, characterized in that the control valve slide (36,48 or 90) has an axially directed and in its extension outwardly leading bore (57, 59 or 116) to relieve the Has chambers (58 and 98). Considered publications: German Patent Nos. 945 553, 942 248; German exploratory documents No. 1 140 094,
099 867; French Patent No. 1,165,738; French additional patent specification No. 71 179
(Addition to French patent specification no.
172 754). 1 sheet of drawings 509 518/256 3.65 © Bundesdruckerei Berlin