DE1254028B - Actuating device for hydrostatic motor vehicle transmissions - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY GERMAN AM » PATENTAMT Int Cl .;

D 60 k

EDITORIAL

N'umausn
Nude fairies
AnnxkicUg:
Aoslegclaf:

B62 <]
German class: 63 c-WiI

H 53) 31 U / 63 c

3.1anmrl% 6

9. ΝανβπΛβΓ 1967

Dk invention relates to a
for a hydrostatic transmission of a KtaMaknm gcs, in particular the SirAScnkeiitrasJchinc in which the pump: and the hydrofuitHchc Moior run in an open hydrostatic circuit, whereby mm s change the delivery rate of the pump esie »ill · curltcTJ adjustable DrtHsd between the drive and mm switching of the pump and the hydroital motor is provided with a winder.

Bekaaoie hydrailsliscbc FalirantrM> 6 earnvder work with a lock or open door lock. In closed circuits, the axial piston pump driven by a Brtnokraftm & ichinc is generally used with wsrürKlcriidicm Fordcrvolunien dnc}) two dugc distribution of the f ^ mpaizyUndeis air Pufnpenschsc in order to have a step-by-step adjustment of the speed . enaögljchen, the Urakchnmg of Forder · direction from Fihrbriane arbetieL Such getchlca · seoen Krdiliufe require ntbta the expensive axial piston pump cylinder ^ TCixhweokbucm else zusötzücbe feed pump: with flushing end Spcisewsitilen and lind therefore very expensive to build.

Fir eip; ILufeolose FJmtdluag def Fnhrjoctrwindigfceä are already offcoe li) dro6tdCi £ cnc Krcitßufdei and in the SaupeilUng act pump ciae an additional throttle built in v><ordio (Öster-PaiealK ± rift 211 175). There. In these measures for hydroHfl tables
KrafifahnicuggctTicbc

Note:

HAKO-WERKE Horn Koch & Son,
Bed CHdeiIot, Berlin »Ring 21-27

Named from Erfaxlrr:
Hugo vcwn Berj, Korisnibe

of the window locker as a result of the
When the coming high operating pressures of several hundred thousand feet / cm »considerable locking pins and dtmN lonfc BetiujjuRsihebcl were necessary, 10 daft def β * turning overbkber not by pedals with berz swivel angles! and therefore begreezic / n transmission ratio could be activated.

The object of the invention is to provide a hydrostatic drive for Sirißenfahrzeucc, especially Siraßenkcfirmirtchincn, with cjncro open Krctslouf can use 2 »at the waiter a single detail of a tiered taste, VorwäitSr and Rfickairtsfahrt, Idle and brake voi ^ enefiiraen or

send the pump from only ia “nc direction iördcrt. is 30 cingcsiellt can be wwden, that is, a mistake with 2iir Eraefuog dor stsfettlosetl RUckwirtSfahn r »t- the> orict]} iaitea Eigeascha / tea of an open cheap ichea of the Purape and the hydrostatic Fehjraotor a fan rite eJTigeboui
(fnzösiicfee Patentscfariit 1 236 732), via Ott) that
DrucWJ for Vorwjlrtsfabrt of the ciecn SdIc aid Mr 15
RlckwttmMuT def nndcrcn Sdu of the drive motor is fed. The hydraulic extrusion
cannot be used as a driving brake, there
the operation of the door sash of the dog and the

Dosing of the dose by hand or by pedal "" ncm EinäicUv. "^> On eke'm common operation must be done. For reasons of clarity, orpn lxtiiti; lxL- are required where the reversing bar is installed at the laboratory. In a self-adjusting open circuit, however, the setting becomes apparent, in which, with the throttle closed, the front sufcnJoicn Fnhjfcjcfruindiskci: at least the! The engine can be moved to a position where it can be used as a cheap seal and of the reversing diiebers flii 'the forward or the reverse suffer but dtram, since £ in addition to ciocm lauikJtunc of the h} tlrosiatisckee motor connects.

for the Wcfx) c * chiii> w iin zu- y> Nico a further feature of the invention is sitdkhes Bdatigunporgan for the throttle in the advantageous procedure so that the gate valve Sattgleituoj is necessary, whereby so far IUr from one in a control step Pistons

Circuit, which at the same time has the advantages a sesdlossenea hydrostatic circular buoy.

To solve the problem, according to the F.rfiD-dung vocfesc ^ it was stated that in the cinfangs cfwihntco BctäJJß.uogs% orrichiung for a gearbox of a motor vehicle, the weodc slide with the cinucHbar.cn Dros "! is mechanically coupled and both rmt small

with piston rods on both sides, which in the other The adjustment takes place directly, that the WeilcU idle position with the throttle closed on the slide from a neüträlefi, automatically adjusting pressure line connected slots partially! When the cylinder is covered and provided on both sides of the piston, the flow and return lines are connected to the flow and return lines of the hydrostatic motor; Opening the throttle in the void position vet ends of the piston rods on both sides is pushed with one each, in which the pressure line of the pump is provided for each plunger piston, which in the idle position, according to the direction of adjustment of the reversing slide, either form the annular gap with the ends of the control sleeve Vdrlaufleitung or with the return line the. Via which the cylinder spaces are connected to the supply of the hydrostatic motor.
containers are connected. For a constructive solution to this common

This makes it possible to operate both the reversing slide and the throttle with the reversing slide

as well as the throttle by a common actuation - very i its adjustment forces and small adjustment

to operate transmission organ at the same time, with only small because of the following is provided.

Adjustment paths are required and only the smallest possible

adjusting forces must be applied so that the NEN housing 11 (F i g. 2 and 3) are two parallel

Actuation of the reversing slide and the throttle via control sleeves 12 and 13 mounted at one end

a conventional pedal can be done. There are thus for directly in the oil reservoir 1 and on the other-

an open hydrostatic circuit practically open the Ren end in an end cap 14, the

the same advantages can be achieved as with a closed 20 via a connection 15 again with the oil supply

This hydrostatic circuit, however, is connected by container 1. The control sleeve 12 is over

the means used, in particular provided an axial length with longitudinal slots 16 which

by the throttle that is used, one via an outer annular space 17 with the one to the pump 2

extremely inexpensive construction is achieved, running suction line 3 are connected. In the

In the drawings, in the following 25 control sleeve 12, a throttle piston 18 is displaced,

Description of the embodiment explained in more detail, the axial length of which is such that the egg

the actuating device according to the invention dar- longitudinal slots 16 completely covers. This position of the

set, namely shows throttle piston 18 is the neutral position or empty

F i g. 1 a schematic representation of an open running position and adjusts itself automatically * as before hydrostatic circuit is explained with the actuation before 30; The control sleeve 12 with the throttle direction According to the invention, pistons 18 form the ones shown in FIG. 1 labeled 7

F i g. 2 shows a longitudinal section through the housing of the throttle in the suction line 3 of the pump 2. From the

Actuating device with jointly actuated pump 2 is pressurized oil depending on the axial displacement

Reversing slide and throttle, the throttle piston 18 and the lifting of the vol-

Fig. 3 is a section along the line AD of the 35 Hgen cover in the lower or upper part of the

F i g. 2, longitudinal slots 16 either directly from the oil reservoir

4 shows a cross section along line EF of the container 1 or from this via the connection 15

F i g. 2, and the interior of the end cap 14 is sucked.

5 shows a schematic side view of the turning slide 9 according to FIG.

housing and the actuator with a 40 speaking Fi g _; 2 and 3 from the to the control sleeve 12

Pedal. parallel control sleeve 13, in which a piston 19

According to FIG. 1 consists of the open hydrostatic slidably mounted, which in the aforementioned new circuit consists of a reservoir 1. from which a central position of the throttle piston 18 axially offset pump 2, in particular an axial piston pump, via slots 20 α and 20 b only partially covers this a suction line 3 sucks in oil and this oil via a 45 slots 20 α and 20 b are via an outer ring pressure line 4 to a hydrostatic motor 5 to room 21 of the control box with the pressure line 4 from which the pressure oil leads via a return line. Pump 2 connected and are on the other hand with device 6 in the reservoir 1 running back. An adjustable throttle 7 is installed in the cylinder chambers 22 and 23 on both sides of the piston 19 suction line 3, in connection.

by means of a flow rate control to the stepped 50 The cylinder chambers 22 and 23 are guaranteed via controlless adjustment of the driving speed and outer annular chambers 24 and 25 with the is performed. Next is to the pressure line 4 of the flow and return lines 26 and 27 of the hydrosta pump 2 a pressure relief valve 8 connected to the motor 5 in connection. To the piston 19 sen, and between the pump 2 and the hydrostatic grip piston rods 28 and 29 coaxially on both sides table motor 5 is a reversing slide 9 of each 55, on which guides 30 arranged in a star shape After adjustment, the pressure line 4 is arranged with a pre-set (see also Fig. 4), which is in the control line 26 of the hydrostatic motor and a sleeve 13 slide. Both piston rods 28 and 29 Return line 27 of the same with the return line each carry a plunger 31 and 32 such that device 6 to the oil reservoir 1 or vice versa connects the inner edge of the plunger with the outer tie or the flow and return lines of the hydro- 60 edge of the control sleeve 13 form an annular gap, static motor bridged. when the piston 19 is in the aforementioned neutral

The throttle 7 in the suction line 3 is located with the position. The piston rod 28 is on the

Reversing slide 9 extended by a mechanical linkage plunger 31 addition and engages over

10 coupled, as dashed with 10 in F i g. 1 to a link 33 on a lever arm 34, which on

is interpreted. As a result, the throttle and the 65 can be fastened to a pivot 35 mounted in a rotatable manner. Of the

Reversing slide by means of a single actuating pin 35 is shown in FIG. 5 outside the

organs, advantageously by a pedal, d. H. provided by a small end cap 14 with a lever 36, def

Travel ranges and small forces are jointly set via a linkage 37 with an axis 38

pivotably mounted pedal 39 is articulated.

At a greater distance from the pin 35, a piston rod 40 of the throttle piston 18 engages the lever arm 34. The piston rod 40 is gimbal-connected to the throttle piston 18 and engages with a transverse pin 41 in a slot on the end of the lever arm 34. The free end of this piston rod 40 is axially movable on both sides by a spring 42 in a cylinder 43, which is axially adjustable and lockable, so that the complete coverage of the longitudinal slots 16 by the throttle piston 18 and at the same time the partial coverage of the slots 20 α and 20 b is adjustable by means of the piston 19, ie the neutral position or idle position of the hydrostatic transmission is set, and this position is automatically set again after each displacement of the throttle piston 18 and the piston 19.

In this neutral position, which is automatically adjusted by a spring 42 supported on both sides, the supply and return lines 26 and 27 of the hydrostatic motor 5 are short-circuited, because the supply line 26 is now above the cylinder chamber 22 and the slots 20 α and 20 b with the cylinder chamber 23 and thereby with the return line 27 in connection, and also both cylinder spaces 22 and 23 are connected to the oil reservoir 1, since the plungers 31 and 32 form annular gaps with the end edges of the control sleeve 13.

If the pedal 39 is now operated in the direction of forward travel, for. B. tilted forward, the lever arm 34 is pivoted downward, and thus the throttle opens via the piston rod 40 by lowering the throttle piston 18 releases an upper part of the longitudinal slots 16, so that pressurized oil from the pump 2 via the end cap 14 and the connection 15 is sucked out of the reservoir 1. This pressure oil is supplied from the pump 2 via the pressure line 4 to the turning slide valve whose piston 19 moves simultaneously downward, and the lower slot 20 covering b. The plunger 31 moves into the control sleeve 13 and closes the cylinder chamber 22, to which the pressure oil is now fed and then reaches the hydrostatic motor 5 via the feed line 26 and drives it. On the output side of the hydrostatic motor, the pressurized oil runs through the return line 27 and reaches the cylinder space 23, which is connected to the oil reservoir 1, the oil flowing back into the oil reservoir 1 through the annular gap between the plunger 32 and the lower edge of the control sleeve 13 . This annular gap should, if possible, be equal to or larger than the respective opening width of the throttle. By continuously pressing the pedal 39, the throttle is continuously opened, and thus a stepless change in the delivery rate of the pump and thus a stepless application of the hydrostatic motor is possible.

If the pedal 39 is tilted in the opposite direction, the individual processes are reversed, and the return line 27 is charged with pressurized oil, while the feed line 26 is the return line so that the hydrostatic motor thereby reverses its direction of rotation.

From the described embodiment shown, it follows that for the simultaneous actuation of the Throttle and the reversing slide only small adjustment paths are required and that the adjustment of the Reversing slide, which in the neutral position assumes a floating position, so to speak Requires very small forces that are easily exerted by the driver's foot on the accelerator pedal can, so that the same advantages can be achieved with an open hydrostatic circuit are like a closed hydrostatic circuit.

Claims (10)

Patent claims: 1. Actuating device for a hydrostatic transmission of a motor vehicle, in particular a street sweeper, in which the pump and the hydrostatic motor in one open hydrostatic circuit, whereby to change the delivery rate of the pump a arbitrarily adjustable throttle and to switch the direction of travel between the pump and the hydrostatic motor a reversing slide is provided, characterized in that the reversing slide (9) with the adjustable The throttle (7) is mechanically coupled and both have a small adjustment path of a common one Adjusting element (pedal 39) can be actuated, the reversing slide being an automatically adjusting Idle position, in which, when the throttle is closed, the flow and return lines (26 and 27) of the hydrostatic motor connects, while opening the throttle (7) can be moved into a position at which he the pressure line (4) of the pump (2) depending on the direction of adjustment of the reversing slide (9) with the The flow line or the return line (26 or 27) of the hydrostatic motor (5) connects. 2. Actuating device according to claim 1, characterized in that the reversing slide (9) consists of a piston (19) guided in a control sleeve (13) with piston rods (28 and 29) on both sides, which in the idle position when the throttle (7) is closed the pressure line (4) partially covers the connected slots (20 α and 20 b) , and on both sides of the piston (19) provided cylinder spaces (22 and 23) with the flow and return lines (26 and 27) of the hydrostatic motor (5 ) are connected, which in the idle position with the ends of the control sleeve (13) form annular gaps via which the cylinder spaces (22 and 23) are connected to the storage container (1). 3. Actuating device according to claims 1 and 2, characterized in that the piston rods (28 and 29) on both sides of the piston (19) are mounted via guides (30) in the control sleeve (13) of the reversing slide (9) which have annular sector-shaped openings . 4. Actuating device according to claim 1 or claims 1 and 2, characterized in that that the throttle (7) consists of one in an open on both sides and on both sides of the oil reservoir (1) connected control sleeve (12) consists of axially movable throttle piston (18), the longitudinal slots (16) connected to the suction line (3) in the idle position completely covers and with axial displacement the Connection of the oil reservoir (1) via the produces one or the other open end of the control sleeve with the suction line. 5. Actuating device according to claims 1 to 4, characterized in that the piston (19) and the throttle piston (18) parallel to it via a link (33) or a Piston rod (40) are articulated to a pivotable lever arm (34), which of a pedal (39) is pivotable in one direction or the other and thereby the The throttle piston (18) and the piston (19) moves in one direction or the other. 6. Actuating device according to claims 1 and 5, characterized in that the articulation axis of the link (33) of the piston (19) of the reversing slide (9) on the lever arm (34) closer to its pivot axis (35) than the articulation axis of the piston rod (40) of the throttle piston (18). go 7. Actuating device according to claim 1 and one or more of claims 2 to 6, characterized in that the piston (19) of the reversing slide and the throttle piston (18) by a spring as (42) clamped at both ends in one of the idling positions Be held in the middle position. 8. Actuating device according to claims 1, 5 and 7, characterized in that that the piston rod (40) of the throttle piston (18) with a transverse pin (41) in an end face Slot at the free end of the lever arm (34) engages and at its free end by means the spring (42) clamped on both sides is mounted in a cylinder (43) which is axially adjustable and is detectable. 9. Actuating device according to claim 1 and one or more of claims 2 to 8, characterized in that even with small switching paths or axial movements of the Reversing slide (9) the partial overlap of the piston (19) with the slots (20 α and 20 Zj) can be canceled in an axial direction, with the control sleeve (13) on the other side of the piston can be locked by the plunger located here (31 or 32) and depending on the Shift direction the pressure line (4) with the flow or return line (26 or 27) of the hydrostatic motor (S) can be connected. 10. Actuating device according to claim 1 and one or more of claims 2 to 9, characterized in that the area of the annular gap between the control sleeve end facing away from the closed control sleeve end and the plunger piston (31 or 32) lying here is equal to or larger than the respective opening between the throttle piston (18) and the longitudinal seat (16). Considered publications:
Austrian Patent No. 211175;
French patent specification No. 1,336,732. For this purpose 2 sheets of drawings 709 687/236 10.67 © Bundesdruckerei Berlin