DE7906825U1 - CARBURETOR WITH A THROTTLE VALVE - Google Patents

Description

• tit · · · ·

ι i * ii (■ · ici

■ «itti c t

tttttct te ι. tt '

Pierburg GmbH & Co. KG
Leuschstrasse 1

4040 Neuss

Carburetor with a throttle valve

The innovation concerns a Verqaser with a throttle valve and a fixed on the throttle valve shaft outside of the Str'imunqsweges arranged lever on which, with the interposition of a spring element, the accelerator pedal another lever engages, the first lever in the opening direction of the throttle claw against a braking device acts, which enables faster movement in the opposite direction of movement.

Such a device is known from DE-PS 585 831. The purpose of this is that the opening of the throttle valve does not take place immediately with a rapid movement of the accelerator pedal, as a result of which the negative pressure collapses avoided in the intake manifold and thus a jerk-free acceleration is achieved.

The known device has, in addition to a very high construction cost, the disadvantage that the closing of the throttle \

klaope is also delayed because the brake is with;.

Liquid is filled. The brake piston is provided with a valve that has a larger flow cross-section |

releases, but there remains a considerable flow resistance leading to delays. > _

ttllltCt \ J

t £ t <-, (I t

ll-'i - t t!

Proceeding from this, the innovation is based on the task of creating a facility that requires little construction a too fast opening of the Drosselklaope avoids and thus prevents pronounced load change shocks and an immediate closing of the throttle valve when accelerating enables.

According to the innovation, this object is achieved in a carburetor of the type mentioned at the outset in that the second Lever arranged freely rotatable against the force of the spring arranged along with it on the throttle valve shaft is and that the first lever for action by the second lever has a driving finger and the

i first lever coupled to the brake via a freewheel |

In the development of the innovation it is provided that the §

1 braking device is formed by a diaphragm box,. whose operating rod has the freewheel and is in communication with the fixed lever and its atmospheric ventilated chamber is provided with a spring, and the other chamber is connected to the atmosphere via a nozzle stands.

Another option for the design is to that the braking device is formed by a vacuum unit, the actuating rod of which has the freewheel and communicates with the fixed lever and one chamber of which is atmospherically ventilated and the other of which Chamber is acted upon by the suction pipe pressure via a nozzle.

An embodiment of the innovation is shown in the drawing ®

shown schematically and is described in more detail below:

• I ■ · · t

The carburetor 1 is shown here only in the parts necessary to understand the innovation. It goes without saying, however, that it contains all parts and systems that are required for a carburetor to function. A throttle valve 3 with a throttle valve shaft λ is arranged in the flow path 2. A lever 5 is connected to the shaft 4 outside the flow path. This lever 5 is connected to a freely rotatably mounted lever 7 via a spring 6 arranged on the shaft 4. The second lever 7 is arbitrarily actuated in the direction of the arrow 9 by an accelerator pedal (not shown) aegen the force of the spring 6 and a return spring 8. The first lever 5 is actuated in the opening direction of the throttle valve 3 by means of the spring 6. During the opening movement, the spring 6 must overcome the braking effect of a diaphragm box 10. The lever 5 is connected to this via a rod 11 and an actuating rod firmly connected to the membrane 12. The actuation rod 13 has a freewheel 14 opposite the rod 11. The function of this freewheel 14 is explained below. The membrane acts against the force of a compression spring 16 arranged in the atmospherically ventilated chamber 15. The second membrane chamber 17 is connected to the atmosphere via a nozzle 18. The cross section of the nozzle 18, in cooperation with the force of the spring 16, determines the braking behavior of the diaphragm box 10. With a corresponding delay, the throttle valve 3 opens the flow channel 2.

In a further solution it is provided that the spring 16 is omitted and to achieve a sufficient braking effect the nozzle 18 via a hose connection, not shown, to the suction pipe downstream of the throttle valve 3 communicates.

11 lilt

111

1 J ~ l'-J

If the accelerator pedal is taken back against the direction of the arrow, it must be required that the Throttle valve 3 moved in closing direction without delay. This is once caused by the force of the already mentioned tension spring 8, which the lever 7 and thus Via a Mitnahmefinqer 19 of the lever 5, the throttle claw 3 actuated. On the other hand, a braking effect of the diaphragm box 3 is prevented in that in the mechanical connection by means of the rods 11 and 13, between the lifting] 5 and the diaphragm box 10 Freewheel 14 is provided, which enables the rod 11 to move in this direction of movement without exerting force to move in the Betätigunqsstanqe 13.

t 1 1

1 I I

111 I.

Claims (3)

I I 1 till protection claims 1.) Carburetor with a throttle valve and a lever fixed on the throttle valve shaft outside the flow path, on which the accelerator pedal engages via a further lever with the interposition of a spring element, the first lever acting in the opening direction of the throttle valve against a braking device which enables faster movement in the opposite direction of movement, characterized in that the second lever (7) is arranged to be freely rotatable against the force of the spring (6) mounted together with it on the throttle valve shaft (4) and that the first lever (5 ) is for Action by the second lever (7) has a driving finger (19) and the first lever (5) is coupled to the brake (10) via a freewheel (14). 2.) Carburetor according to claim 1, characterized in that the braking device by a diaphragm box (10) is formed, the actuating rod (13) has the freewheel (14) and with the fixed lever (5) is in connection and its atmospherically ventilated chamber (15) with a spring (16) is provided and the other chamber (17) via a nozzle (18) with the atmosphere in connection stands. «* I * i ·« fit · · It til • 1 I i (i 3.) Carburetor according to claim 1, characterized in that the braking device by a vacuum unit (10), the actuating rod (13) of which has the freewheel (14 ) and is connected to the fixed lever (S) and whose one chamber (16) is aerated and the other chamber (17) via a nozzle (18 ) is pressurized with intake manifold pressure.