DE4017660A1 - Automotive hydraulic brake-servicing device equipment - Google Patents

Abstract

The equipment dispenses fresh brake fluid and stores used fluid when servicing automotive brake systems (17). The dispensing unit (1) incorporates a motor-driven pump (2, 3), a storage vessel (4), a pipe (7) to a union (8), and a pressure gauge (5). A collector for the used fluid incorporates a small vessel with measuring scale, and a pipe (10) with union (11). The dispensing unit incorporates an overflow pipe with adjustable valve (27), a moisture filter (29), and a stop valve (30) in the pipe (7). The storage unit (9) has two parallel hydraulic circuits (16.1, 16.2), each with a one-way volume meter (13.1, 13.2), a quantity preselector and indicator (14.1, 14.2), and a resetting mechanism (15.1, 15.2). Pipes (10.1, 10.2) with unions (11.1, 11.2) and stop valves (12.1, 12.2) lead via a main pipe (18) to a multi-way collector vessel (19) with extraction union (20). The pipe (23) from a drip cut (22) also leads into the vessel. @(12pp Dwg.No.1/5)@

Description

The invention relates to a device for dispensing unused brake fluids, as well as for preselecting, measuring, recording and collecting used brake fluids, in particular for hydraulic brake systems in motor vehicles. Separate Einrich lines on the one hand for dispensing unused brake fluids, on the other hand for easy collection of used brake fluid speeds in bleeding and changing processes are known. Unused brake fluid is pressed into the brake, a brake circuit or its reservoir by a special dispensing device until a certain volume, which has been determined by the vehicle manufacturer, used fluid in an open bottle or the like is connected via an end connection of the circuit in question is caught. This bottle has a measuring scale, e.g. B. with a 100 cm ³ graduation on which the amount collected is visually read; as soon as this is reached, the dispensing process with the dispensing device at the other end of the hydraulic circuit is terminated and the process for this circuit is ended. The used brake fluid collected is then poured from the bottle into any collecting vessel that is not part of the entire facility. Other liquid, consistent or solid wastes can also get into this vessel, e.g. B. used oil, coolant, cold cleaner or the like due to improper handling; its contents will inevitably become special waste with significantly higher disposal costs.

The previous handling in dealing with brake fluids is therefore not very professional, but rather a manual solution; moreover, it is not suitable for the specific requirements of modern environmental protection is inevitable and sufficient fulfill. For the present application, these are: absolutely separate collection and storage of used brakes liquids to refurbish them - don't mind a destruction, e.g. B. by combustion - to supply. These Environmentally relevant tasks have not yet been solved.

Based on this prior art, the invention lies Task with a device that functions as a construction and functional unit is formed, both the delivery of unused brake fluids as well as the preselection, measurement, Admission and collection of used brake fluids too create a temporary storage of the used Brake fluids is made possible. It has been shown that by this procedure with the device according to the invention the whole process is done in about half the time can be, as usual so far; this is done volumetrically exact recording of the used brake fluids in one large-volume exchange container of 30-100 liters content, the is integrated in the device. The full container will cost one supplied to favorable reprocessing; this is against unauthorized persons Secure opening or filling with foreign substances (reusable collection container). After it has been emptied and cleaned, it can be used again be filled. The provision of the unused brake fluids can both from original containers (e.g. 60 liter content), the immediate bar can be set in the device, as well as from larger delivery units (e.g. 200 liter drum), from which the brake fluid in a special container of the device is transferred.  

A novelty here is the structure and the hydro-mechanical Mode of action of the reciprocating piston measuring unit in connection with the quantity preselection and - display for used brake fluids - serial behind arranged the brake circuit - it consists of a piston with a cylinder, the piston rod on one side for stroke display and manual operation is brought out. There is a back in the piston integrated check valve that at the same time, in the manual return Guide the piston to its starting position, mechanically unlocked and thus causes the brake fluid to be transferred into the cylinder becomes; the pump is switched off during this transfer process. While In the first step of the entire process, a quantity of the used is used Brake fluid as a working medium, at the same time due to the hydraulic series connection,

• - upstream an identical quantity of unused brake fluid released into the brake circuit,
• - followed by an identical quantity of used brake fluid transported into the collection container;

then takes place - between two operations with the power off Pump - manual decanting. Here the quantum, the ur was originally the working medium for the Quantum ready for disposal; this in the 2nd step (in the next step) into the collection container promoted. The energies to complete the 1st or 2nd step (1st or 2nd delivery) each by actuating the pump (according to pressure times volume flow) applied. Generic it is therefore a single-acting, hydro-mechanical Piston measuring mechanism with an adjustable stroke and display, as well a manual stroke reset for volumetric indirect Dosage of unused brake fluids.

A preferred embodiment is shown below with reference to the drawing and, based on this, described a special variant; is shown in detail:  

Fig. 1 shows the hydraulic circuit diagram of the invention for two brake circuits connected in parallel with one input for the unused and two outputs for the used brake fluid (working circuit).

Fig. 2 analogous to Fig. 1 in the special variant of an additional union suction possibility of the used brake fluid from the brake system by an electric pump, the rotation sense of which is reversible for this process (filling circuit).

Fig. 3 shows the front and side view of an electrically operated, mobile device, which is summarized as one unit (idle state).

In the drawings, the same or corresponding construction parts of both strands ( .1 or .2 ) are marked with the same main reference characters. First of all to the hydraulic plan according to FIG. 1.

The serial connection to the hydraulics of the brake system ( 17 ) takes place on the inlet side for the unused brake fluid at the nozzle ( 8 ) of the dispensing unit ( 1 ); This consists of a feed pump ( 2 ), the drive motor ( 3 ), the reservoir ( 4 ) with a level indicator ( 25 ), a pressure gauge ( 5 ), an overflow line ( 6 ) with a check valve ( 27 ) and a connecting line ( 7 ). In addition, there is a drip cup ( 22 ) in which the nozzle ( 8 ) was at rest. The receptacle unit ( 9 ) for the used brake fluid has the connecting piece ( 11.1 and 11.2 ) with the connecting lines ( 10.1 and 10.2 ) for serial coupling to two circuits of the brake system ( 17 ) of the two parallel strings ( .1 and .2 ). A manual shut-off device ( 12.1 and 12.2 ), a measuring unit ( 13.1 and 13.2 ) with a quantity preselection / display ( 14.1 and 14.2 ) and a reset device ( 15.1 and 15.2 ), which in turn are connected to the collecting line ( 18 ) be brought together; this leads to the exchangeable reusable collecting container ( 19 ). A disposal connection ( 20 ) includes the hydraulic input ( 21 ) and the connection of the connecting line ( 23 ) to the drip cup ( 22 ), in which the two nozzles ( 11.1 and 11.2 ) are in the idle state of the device.

The measuring units ( 13.1 and 13.2 ) work as follows. Before commissioning the device, they must be brought manually into their starting position of the lower dead position of the piston by the reset device ( 15.1 and 15.2 ). After the feed pump ( 2 ) has been actuated, the unused brake fluid is pressed into the respective circuits of the brake system ( 17 ). At the same time, the used brake fluid as working medium ( 16.1 and 16.2 ) is pressed into the measuring mechanism ( 13.1 and 13.2 ) with the shut-off device ( 12.1 and 12.2 ) open, as well as the used brake fluid from it into the collection container ( 19 ). By mechanically presetting the stroke of the measuring mechanism ( 13.1 and 13.2 ) on the quantity preselection / display ( 14.1 and 14.2 ), the predetermined quantity is simultaneously released into the brake system ( 17 ) of unused brake fluid or used brake fluid. Once the piston of the measuring device has (13.1 and 13.2) reaches its end position, further flows in operating feed pump (2) the delivery rate on the transfer strömleitung (6) into the reservoir (4) so long back, until it is switched off. However, the other brake circuits are refilled accordingly beforehand after the connecting pieces ( 11.1 and 11.2 ) have been coupled and the reset device ( 15.1 and 15.2 ) has been actuated.

When the device is uncoupled, the drip cups ( 22 ) are intended to prevent additional environmental pollution by inserting the respective nozzles ( 8 or 11.1 and 11.2 ) there.

Overall, the device, consisting of the delivery unit ( 1 ) and the receiving unit ( 9 ), is constructed as a structural unit ( 24 ).

Fig. 2 has the same basic structure as described in Fig. 1 ben. As an additional function of the entire device, a suction possibility of the used brake fluid from the brake system is integrated, ie the entire brake system is first pumped empty and then filled volumetrically with the same pump. This is achieved by the special variant of the feed pump ( 2 ), which is driven by an electric drive motor ( 3 ), whose direction of rotation can be switched for the suction process: the previous hydraulic pressure line becomes a suction line, the previous suction line becomes a pressure line; accordingly, the additional hydraulic circuit takes place. The suction line ( 31 ) consists of the elements check valve ( 32 ), suction filter ( 33 ), vacuum gauge ( 34 ) and suction nozzle ( 35 ). The pressure line strand ( 36 ) located behind the feed pump ( 2 ), arranged parallel to the connecting lines ( 10.1 / 10.2 ), has at least one check valve ( 37 ) and opens into the collecting line ( 18 ), which in turn leads to the collecting container ( 19 ).

In Fig. 3, the device is shown as a complete unit ( 24 ) in its preferred embodiment in the operational idle state, which is particularly mobile; its essential components consist of

• - The chassis ( 38 ) with wheels ( 26 ) and two handles ( 39 );
• - The feed pump ( 2 ) and the electric drive motor ( 3 ) and the power cable ( 40 );
• - The measuring mechanism ( 13.1 and 13.2 ) with the quantity preselection and display ( 14.1 and 14.2 ), and the reset device ( 15.1 and 15.2 ), the shut-off device ( 30 ), the pressure gauge ( 5 ), the connecting line ( 7 ) and the neck ( 8 );
• - The reservoir ( 4 ) for reusable use for unused brake fluids with a fastening device ( 41 ) and the corresponding connections, but in particular, for its moisture-free ventilation, a moisture filter ( 42 );
• - The (reusable) collection container ( 19 ) for used brake fluid, the disposal connection ( 20 ), the fastening device ( 44 ), the connecting piece ( 11.1 and 11.2 ) and the connecting line ( 10.1 and 10.2 );
• - The drip cups ( 22 ) serve to accommodate the nozzle ( 8 or 11.1 and 11.2 ) in the idle state of the device to catch dripping brake fluids in an environmentally friendly manner;
• - A manually operated suction pump ( 45 ) is used as a device accessory, for example to be able to also suction the brake fluid reservoir from the vehicle, with the appropriate lines ( 46 ) and sockets ( 47 ) for connection to the corresponding points on the vehicle or device, or a test device ( 48 ) in order to be able to check the chemical-physical condition of the brake fluid in the brake system ad hoc.

The quantity preselection and display as well as the operation of the device can also be used for the entire brake system consisting of several Circles, adding up one after the other. In this case the total prescribed content of the circles with a measuring mechanism should be operated, added and on the measuring scale displayed. There is no individual reset of the measurement after each operation, but only once after completion the operations on the motor vehicle, which featured with this strand should be taken. This device can also be used for ventilation operations are carried out; here the corresponding Connection connected, the pump operated and at the same time the Reset device can be switched manually.

Other different design variants that are not in detail are claimed are characterized by the following features draws.

Variant 1: The receiving unit ( 9 ) forms an independent unit ( 24 ').

Variant 2: In the dispensing unit ( 1 ), the strands ( 6 ) and ( 49 ) and the storage container ( 4 ) are omitted; the feed pump ( 2 ) has only one direction of rotation; this creates a brake fluid suction device (with or without the collection container ( 19 ) as an independent unit ( 24 '). ( Fig. 2).

Variant 3: The delivery unit ( 1 ), according to FIG. 2, is designed as an independent structural unit ( 24 ') without the receiving unit ( 9 ).

Other variants according to FIG. 1 and FIG. 3 are derived analogously from the variants from 1 to 3.

Reference numerals

1 delivery unit
2 feed pump
3 drive motor
4 storage containers
5 manometers
6 overflow line
7 connecting line
8 sockets
9 acquisition unit
10.1 Connection line 1
10.2 Connection line 2
11.1 Connection piece 1
11.2 Connection piece 2
12.1 Shut- off device 1
12.2 Shut- off device 2
13.1 Measuring mechanism 1
13.2 Measuring mechanism 2
14.1 Quantity preselection / display 1
14.2 Quantity preselection / display 2
15.1 Reset device 1
15.2 Reset device 2
16.1 Working medium 1
16.2 Working medium 2
17 brake
18 manifold
19 collecting containers
20 Disposal connection
21 input, hydraulic
22 drip cups
23 connecting line
24 unit
24 ′ unit (variants 1 to 3)
25 level indicators
26 wheels
27 check valve
28.1 Reset button 1
28.2 Reset button 2
29 Moisture filter
30 shut-off device
31 Suction line string
32 check valve
33 suction filter
34 vacuum manometer
35 suction nozzle
36 pressure pipeline
37 check valve
38 undercarriage
39 handle
40 power cables
41 fastening device
42 Moisture filter
43 -
44 fastening device
45 suction pump
46 line
47 sockets
48 test device
49 Delivery line

Claims (20)

1. Device for delivery or preselection, display, measurement, recording and collection of brake fluids, for serial connection in front of or behind the brake system of a motor vehicle, consisting of a device for unused brake fluids, the

• - Contains a conveyor, a reservoir, a connec tion hose with a nozzle and a pressure gauge, and speeds from a collecting device for used brake fluid, the
• a small-volume container with a measuring scale, contains a connecting hose with a nozzle,

characterized in that the dispensing unit ( 1 ) for unused brake fluids, consisting of

• - A feed pump ( 2 ), a drive motor ( 3 ), a storage tank ( 4 ), a pressure gauge ( 5 ), an overflow line ( 6 ) with a check valve ( 27 ), moisture filter ( 29 ), and a connecting line ( 7 ) with a Connection ( 8 ), and the receiving unit ( 9 ) for used brake fluids, consisting of
• - at least two hydraulically parallel connecting lines ( 10.1 and 10.2 ) with a connecting piece ( 11.1 and 11.2 ), a shut-off device ( 12.1 and 12.2 ), single-acting, volumetric measuring units ( 13.1 and 13.2 ) with a quantity preselection and display ( 14.1 and 14.2 ) and a resetting device ( 15.1 and 15.2 ), the working medium ( 16.1 and 16.2 ) of the brake fluid ( 17 ) to be absorbed by the brake fluid, which open into a common collecting line ( 18 ), which leads to an exchangeable, large-volume collecting container ( 19 ) which has a disposal connection ( 20 ) with at least one hydraulic inlet ( 21 ) and a drip cup ( 22 ) with a connecting line ( 23 ),

are designed as a structural unit ( 24 ). 2. Apparatus according to claim 1, characterized in that the drive motor ( 3 ) is an electric motor. 3. Apparatus according to claim 1, characterized in that the drive motor ( 3 ) is an air motor. 4. Apparatus according to claim 1 and 2, characterized in that the feed pump ( 2 ) is a gear pump. 5. Apparatus according to claim 1 and 3, characterized in that the feed pump ( 2 ) is a piston pump. 6. Device according to one or more of claims 1 to 5, characterized in that the dispensing unit ( 1 ) has an overflow line / check valve ( 6 ). 7. Device according to one or more of claims 1 to 6, characterized in that the structural unit ( 24 ) with rollers, wheels ( 26 ) o. 8. Apparatus according to one or more of claims 1 to 7, characterized in that the collecting container ( 19 ) is held by a fastening device ( 44 ). 9. Device according to one or more of claims 1 to 8, characterized in that the collecting container ( 19 ) is partially or fully transparent and carries the official waste key number of the used brake fluid. 10. Device according to one or more of claims 1 to 9, characterized in that the reset devices ( 15.1 and 15.2 ) of the measuring mechanisms ( 13.1 and 13.2 ) have a manual reset button ( 28.1 and 28.2 ). 11. The device according to one or more of claims 1 to 10, characterized in that the storage container ( 4 ) has a level indicator ( 25 ), and is held by a fastening device ( 41 ). 12. Device according to one or more of claims 1 to 11, characterized in that the drive motor ( 3 ) is designed as a reversible single-phase asynchronous motor with an operating capacitor. 13. Device according to one or more of claims 1 to 12, characterized in that the suction line ( 31 ), consisting of the check valve ( 32 ), the suction filter ( 33 ), the vacuum manometer ( 34 ), the suction nozzle ( 35 ) in parallel to the discharge line ( 49 ), is arranged in front of the feed pump ( 2 ). 14. Device according to one or more of claims 1 to 13, characterized in that the pressure line branch ( 36 ) consisting of at least one check valve ( 37 ), parallel to the connecting lines ( 10.1 and 10.2 ) in the collecting line ( 18 ) opens, is closed is. 15. Apparatus according to one or more of claims 1 to 14, characterized in that the storage container ( 4 ) has a moisture filter ( 29 ). 16. Device according to one or more of claims 1 to 15, characterized in that a test device ( 48 ) is arranged on the chassis ( 38 ). 17. Apparatus according to one or more of claims 1 to 16, characterized in that a suction pump ( 45 ) provided with the lines ( 46 ) and the connecting piece ( 47 ) is arranged on the undercarriage ( 38 ). 18. Device according to one or more of claims 1 to 17, characterized in that the check valve ( 27 ) has a pressure setting.