PL72203B2

PL72203B2 -

Info

Publication number: PL72203B2
Application number: PL14783071A
Authority: PL
Priority date: 1971-04-28
Filing date: 1971-04-28
Publication date: 1974-06-29

Description

Poniewaz komora A zaworu regulacji cisnienia 4 jest polaczona z ko- mora B serwomechanizmu sprzegla 1 kanalami 12 45 i 14, cisnienie cieczy i(Pa) w komorze A równiez wzrasta do wiekszej wartosci <(Pa2) co powoduje, ze tlok 8 dazac do zajecia polozenia, w którym naste¬ puje równowaga sily i(Fs2) sprezyny 7 z "sila (Fp2) dzialajaca na denko tloka 8, przesuwa sie stale w 50 kierunku zwiekszania napiecia sprezyny 7 az do momentu zajecia krancowego polozenia.Wraz ze zwiekszaniem napiecia sprezyny 7 zwiek¬ sza sie dlawienie cieczy w kanale 11 przez element zaworowy 6 co jest przyczyna ciaglego przyrostu 39 cisnienia w komorze B serwomechanizmu sprzegla 1.Czas przyrostu tego cisnienia zalezy od predkosci- przesuwania sie tloka 8, która zalezy z kolei od róz¬ nicy wydatków cieczy wplywajacej do komory A kanalem 14 i cieczy wyplywajacej z komory A ka¬ so nalem 15. Na wartosc tych wydatków maja wplyw przekroje przeplywowe dlawików 17 i 18 umieszczo¬ nych w karlala'eh 14 i 15. Poprzez regulacje prze¬ kroju przeplywowego w dlawiku 18 regulowany jest. czas przyrostu Cisnienia w komorze B serwomecha- 63 nizmu sprzegla 1. Z chwila zajecia przez tlok krafr-72203 cowego polozenia, przy którymi sprezyna 7 jest naj¬ bardziej napieta, cisnienie cieczy (PB) w komorze B serwomechanizmu sprzegla 1 osiaga wartosc kran¬ cowa, na która jest wyregulowane urzadzenie i cykl powolnego wlaczania sprzegla konczy sie.Przestawienie zaworu sterujacego Z w polozenie 2b powoduje, ze komora B serwomechanizmu sprzegla 1 oraz komora A zaworu regulacji cisnie¬ nia 4 zostaje polaczona ze zbiornikiem 13. Cisnienie cieczy i(PB) w komorze B serwomechanizmu sprze¬ gla 1 spada do wartosci zerowej i sprzeglo zostaje wylaczone. Jednoczesnie spada cisnienie cieczy (PA) w komorze A zaworu regulacji cisnienia 4 do war¬ tosci zerowej i tlok 8 naciskany sprezyna 7 wypy¬ cha ciecz z komory A kanalem 16 poprzez zawór sterujacy 2 do zbiornika 13. Cykl wylaczenia sprze¬ gla jest zakonczony.W odmianie urzadzenia wedlug wynalazku, przed¬ stawionej na fig 2, predkosc przesuwania sie tloka 8 w zaworze regulacji cisnienia 4 zalezy od wydatku cieczy wplywajacej do komory A kanalem 14. W ce¬ lu zwiekszenia czasu przyrostu cisnienia przez zmniejszenie wydatku cieczy wplywajacej do komo¬ ry A w cylindrycznym otworze 10 jest umieszczona sprezyna 22, która jednym koncem opiera sie o opo¬ rowa powierzchnie 23, a drugim koncem o tlok 8: Tlok 8 dzialajac na ciecz pod wplywem sprezyny 22 powoduje zmniejszenie róznicy ciislnien pnzejd i za dlawikiem 17 i przez to zmniejszenie wydatku cieczy przeplywaliacej przez dlawik 17 do komory A.W urzadzeniu wedlug wynalazku oraz w jego od¬ mianie, uzyskuje sie duzy czas przyrostu cisnienia cieczy w serwomotorze sprzegla 1 'dzieki temu, ze ruch tloka 8 powodujacy zwiekszenie objetosci ko¬ mory A uzalezniony jest od wydatku cieczy wply¬ wajacego poprzez dlawik 17 do komory A, która ma duza objetosc. Objetosc komory A mozna zwiekszyc przez zwiekszenie srednicy cylindrycznego otworu 10, w którym przesuwa sie tlok 8. Dzieki temu mozna uzyskac dowolnie dlugi czas przyrostu cis¬ nienia cieczy w serwomechanizmie sprzegla 1. 6 PL PLAs chamber A of the pressure control valve 4 is connected to chamber B of the clutch servo 1 through channels 12 45 and 14, the pressure of the liquid i (Pa) in chamber A also increases to a greater value <(Pa2), which causes the piston 8 to engage the position in which the force and (Fs2) of the spring 7 are in equilibrium with the force (Fp2) acting on the bottom of the piston 8, moves continuously in the direction of increasing the tension of the spring 7 until it reaches its final position. the throttling of the liquid in the conduit 11 by the valve element 6 increases, which is the cause of the continuous increase in pressure 39 in the chamber B of the clutch servo 1. The time of this pressure increase depends on the speed of the piston 8, which in turn depends on the difference in the flow rates of the liquid. flowing into chamber A through channel 14 and the liquid flowing from chamber A through channel 15. The value of these expenditures is influenced by the flow sections of throttles 17 and 18 placed in karlala'eh 14 and 15. By regulating p The flow section of the throttle 18 is adjustable. Time of pressure increase in chamber B of the clutch servo mechanism 1. As soon as the piston takes the krafr-72203 position at which the spring 7 is the most tensioned, the liquid pressure (PB) in the chamber B of the clutch servo mechanism 1 reaches the limit value for which the device is adjusted and the slow engagement cycle ends. By turning the control valve Z to position 2b, chamber B of the clutch servo 1 and chamber A of the pressure control valve 4 are connected to the reservoir 13. Liquid pressure i (PB) in chamber B of the clutch servo 1, it drops to zero and the clutch is disengaged. At the same time, the liquid pressure (PA) in chamber A of the pressure control valve 4 drops to zero and the piston 8 is pressed by the spring 7 to drain the liquid from chamber A through channel 16 through the control valve 2 into the reservoir 13. The shutdown cycle of the clutch is complete. In a variant of the device according to the invention, shown in Fig. 2, the speed of the piston 8 in the pressure control valve 4 depends on the flow rate of the liquid flowing into chamber A through channel 14. In order to increase the time of pressure build-up by reducing the flow rate of liquid flowing into the chamber A spring 22 is placed in the cylindrical bore 10, with one end against the resistance surface 23, and the other end against the piston 8: The piston 8, acting on the liquid under the influence of the spring 22, reduces the pressure difference upstream and downstream of the throttle 17 and by This reduction of the flow of the liquid flowing through the throttle 17 into the chamber AW in the device according to the invention and in its variation, a long time of pressure increase is obtained The wires in the servomotor clutch 1 'because the movement of the piston 8 to increase the volume of chamber A depends on the flow of liquid flowing through the throttle 17 into chamber A, which has a large volume. The volume of chamber A can be increased by increasing the diameter of the cylindrical bore 10, in which the piston 8 moves. Thanks to this, it is possible to obtain any long time of increasing the liquid pressure in the clutch servo 1. 6 EN EN

Claims

1. Patent claims 10 15 20 25 30 35 40 1. A device for the hydraulic control of a clutch, in particular a motor vehicle clutch, consisting of a clutch servo, a control valve, a power supply and connecting lines, characterized in that it is provided with the pressure control valve and (4) connected in series with the control valve (2) so that in one position and (2a) of the control valve (2) the pressure control valve (4) is disconnected from the supply system (3), and in the second position (2b) of the control valve (2) the pressure control valve and (4) is connected to the supply system (3) and regulates the liquid pressure in the clutch servo mechanism (1) so that after opening the control valve ( 2) fluid pressure rises slowly. 2. Device according to claim A valve as claimed in claim 1, characterized in that the pressure regulating valve (4) has a valve element (6), a piston (8), a spring <7) sandwiched between the valve element (6) and the piston (8) and a chamber (A) provided Oid side "of the piston bottom (8), the chamber (A) being connected to the main channel (12) between the control valve (2) and the clutch servo piston (21) (1) by means of the channel (14), a device according to claims 1 and 2, characterized in that the pressure control valve (4) has a channel (11) which is connected on one side to the main channel (12) between the control valve (2) and the piston and (21) of the clutch servo (1), and on the other hand to the reservoir (13), the flow section of the channel (11) being changed by the valve element ( Device according to claims 1 and 2, characterized in that the chamber (A) of the pressure regulating valve (4) is connected to the reservoir (13) by means of a channel (15) in which a throttle (18) is placed. . ABOUT device change according to claim The method of claim 3, characterized in that the pressure control valve (4) has at least one spring (22) disposed between the piston (8) and the abutment surface (23) of the body (5). ERRATA Lam 3, line 22 is: the invention is presented should be: the invention consists of a servo-KI. 63c, 19/01 72203 MKP B60k 19/14 Fig.

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