DE3433236A1 - Combination device for simultaneously measuring and recording brake pedal force and deceleration values - Google Patents

Abstract

Combination device for simultaneously measuring and recording brake pedal force and resulting deceleration in mobile units such as motor vehicles and the like. Two swivel levers are provided rotatably mounted at one end, one of which is weight-loaded and the other receives fed to it via a relatively short leg an adjustment movement which is proportional to the applied brake pedal force. The two swivel levers drive print elements which extend in a linear guide device in the transverse direction with respect to the conveying direction of the diagram sheet. All the rotary positions and sliding positions are, as required, constructed as easy running bearings, preferably ballbearings, and the transducer for the conversion of pressure of the brake pedal force operates free of friction with the aid of a metal bellows.

Description

Combination device for simultaneous measurement and recording

of brake pedal force and deceleration values PRIOR ART The invention is based on a combination device according to the preamble of the main claim. Combination devices of this type are known because it is often both desirable and necessary behavior of a vehicle, in particular a motor vehicle, when braking under natural conditions to grasp and evaluate. Since the curve of the braking force, the is applied by the driver of the motor vehicle, and the resulting delay of the vehicle must be correlated with each other are at least the writing elements arranged so that they are simultaneously, for example one above the other, record on the same, continuous diagram sheet, which is then with constant Feed speed is pulled past the writing elements.

Cm. the one generated by the user of the vehicle at the respective point in time To be able to record braking force, a pressure / displacement transducer is usually provided, where the initial movement of this transducer at least indirectly causes the writing movement of the writing element over the continuous writing.

Inertia sensors can be used as deceleration sensors, the degree of freedom running in the direction of the vector of the delay dispose, so that this directly results in a verse part movement, which at corresponding coordination of further elements for recording the delay evaluated can be.

However, this is problematic with the known combination devices Kind, which can also be briefly referred to as brake pedal force deceleration recorder, that by recording non-linear relationships in the curves and their Assignment to the time axis are brought in; furthermore, those correspond to known ones Devices also do not always meet the required accuracy requirements, which is not the case lastly because of excessive frictional influences in the implementation and evaluation of the recorded physical quantities of pressure and delay, on additional disturbance quantities and in the sense of the generation of additional safe non-linear influences and to that extent incorrectly acting components involved in the evaluation can be traced back.

The invention is therefore based on the object in a combination device for simultaneous measurement and recording of brake pedal force and deceleration in the case of mobile units to ensure that the recorded values are shared Diagram sheet can be recorded lifelike and without falsifications as well as linearly can.

Advantages of the Invention The combination device according to the invention solves this task with the characterizing features of the claim and has the Advantage that when reaching a particularly high level of accuracy in the detection and Implementation of the physical quantities to be measured from pressure and delay a flawless linear recording can be carried out, with the additional necessary means, namely straight-line guiding devices for both writing systems neither the accuracy nor the ease of implementation and evaluation affect components involved - in other words, despite improved because linear recording possibilities the invention achieves with a total of possible, comparatively simple structure and extreme freedom from friction in all areas and therefore a particularly small influence by such external ones In addition, disturbance variables that change due to aging and temperature influences. Therefore the values recorded with the aid of the device according to the invention are immediate comparable, even if these at different times and at different times Motor vehicles have been included. In this context is still special the easy adjustability and compliance with the adjusted values should be emphasized over long periods of time.

The measures listed in the subclaims are advantageous Developments and improvements of the combination device specified in the main claim possible. The completely frictionless recording and is particularly advantageous Forwarding of the brake pedal pressure via pressure / displacement transducers containing letallfaltenhälge and the realization of the counterforce required for the inertial deceleration sensor in the form of a perfectly adjustable compression spring.

Drawing An embodiment of the invention is shown in the drawing and is explained in more detail in the following description.

It shows: Fig. La the complete combination device in perspective Representation with representation of the outlet slot for the diagram sheet; Fig. lb the primary pressure transducer for detecting the brake pedal force; Fig. Ic a pressure transmission line for connecting the pressure converter of Fig. Ib to the device, Fig. Id a pressure adapter or adapter shows to connect the pressure line to the device; Fig. 2 a possible embodiment of one to be used in the device for each new measurement Chart sheet; Fig. 3 is a plan view of the device of Fig, la with removed Cover and sectional view of some subcomponents; Fig. 4 is a side view the combination device of Fig. La with removed side wall and representation of some Partial components in section; Fig. 5 is an exploded partial view of the Brake pressure transducer assigned to the device, * with some components in section and FIG. 6 shows a detailed sectional view of one of the writing elements on a larger scale.

The description of the exemplary embodiments as shown in FIG Combination device 10 rectangular and, if desired, designed similar to a case, which can also include a side handle 11 (see FIG. 3). A wrote for example in the form of the diagram sheet 11 shown in FIG Data recording is designed over a predetermined period of time, for example 8 seconds is, is inserted into a side inlet slot of the device 10, wherein the both writing units then simultaneously and in parallel, i.e. one above the other on the diagram sheet, record the respective curves.

As will be explained below, the accelerometer is arranged in the device itself, so that this is to be arranged when in use that the Degree of freedom in the motion of the deceleration inertia sensor in The direction of the expected deceleration of the vehicle runs; the pressure values of the The best way to get the applied braking force is on the vehicle's brake pedal attached pressure transducer 12 and a pressure transmission device 13 with an interposed Connection element or adapter or converter 14 to the device that the user applied Brake pressure is primarily applied to the pressure transducer 12, which this pressure in a converts transportable medium pressure via line 13 and at the same time Pressure imparted to the brake pedal unchanged, since it is due to its attachment on the brake pedal is part of the same.

Structure and function of the Rotnbinationsgerats is based on the following of the two representations of FIGS. 3 and 4 are explained. First, the paper transport received. It is a paper transport channel running lengthways through the device 15 provided with a lateral inlet opening 15a and a curved upwardly. Outlet area with outlet opening 15b. The chart sheet is at the one in the drawing illustrated embodiment described from below - the paper transport channel 15 is therefore at least in the area of action of the pens of the writing elements open at the bottom so that the paper can be reached. The chart sheet transport takes place via a lower, driven transport roller or roller 16, the one upper pressure roller or roller 17 is assigned so that the chart sheet between both rollers is pulled through without interference. The respective roller surface can be of a suitable nature, for example an elastomer coating have, so that there are good transport conditions. The drive of the lower The transport roller 16 takes place via a drive belt 18 which runs over a first belt pulley 16a on the driven transport roller 16 and over a second pulley 19 runs, which sits on a motor shaft 20 of a suitable drive motor 21, preferably Low-voltage direct current motor, so that the device can be operated with batteries.

The drive motor 21 for the paper transport is from a bearing block 22 held stationary, which is connected to the bottom of the device by screws 23 is; A belt tensioning device is located on the left-hand side in the plane of the drawing from clamping screw 24 with lock nut 25 and its own bearing 26, so that If necessary, the transmission belt, which can also be a toothed belt, is retightened can be.

The paper transport device is completed by a attached to a removable cover part 27 and pretensioned by a spring 28, Counter-pressure piece, bent up at the edge, running transversely over the writing area 29, so that it is ensured that the writing elements on the continuous diagram sheet leave a clearly visible trace.

The deceleration sensor consists of one on a slightly curved one Swivel arm 30 attached weight 31, with a swivel bearing for the swivel arm 30 at 32. The pivot arm 30 is to carry out its through the weight when occurring pivoting movement caused by deceleration rotatable on a post or stand 32 mounted smoothly, that is, preferably by arranging a ball bearing 33 in the area of a peg-like extension of the stand 32 and securing the swivel arm on its pivot by an applied washer 34 and a snap ring 35.

It can be seen that the weight 31 increases when delays occur shifted in the direction of arrow A, each being a state of equilibrium adjusts between the negative acceleration acting on the weight 31 and a resetting device 36 which is under spring tension. This resetting device includes a compression spring as an essential feature, so that there is good adjustability with aging-resistant setting values. In detail is the reset device roughly like a strut with shock absorber built, where However, it is not primarily the shock absorber effect that matters, and it does so completely can be omitted.

The resetting device comprises a guide rod 37, which at 38 pivotable in a suitable, smooth manner, for example again with the aid a post, not shown, and a corresponding Rugellager, as just before explained, is stored and extends into a sliding sleeve 39, which in turn also pivotable or rotatable, is fixed at 40 on the pivot arm 30. Therefore, the guide rod 37 can slide into the sliding sleeve 39 when at occurring delays the weight 31 the pivot arm in the plane of the drawing Fig. 3 shifted upwards. To achieve the adjustable restoring force, the already mentioned compression spring 41 is provided, on the one hand on a spring plate 42 supported, which is secured by a nut 43, and on the other hand on one compared to the sliding sleeve 39 height-adjustable adjusting nut 44, which is used to support the compression spring has an enlarged head area. The adjusting nut 44 can then shifted accordingly via an intermediate thread on the sliding sleeve 39 and so that the spring preload can be adjusted.

The attachment of the sliding sleeve end area to the pivoting yarn 30 can take place as in ig. 4 shown; a connecting pin 45 is provided, animal can go out from the pivot arm 30 and in this, for example, is non-rotatably seated and in aneßohrung engages in a t-shaped, downwardly open approach 39n of the sliding sleeve 39 and a ball bearing 46 for smooth, frictionless power transmission is held.

The transfer of the swivel movement due to deceleration effects of the pivot arm 30 on an associated writing element for graphic display the deceleration values in the form of a curve are then made by the 47 a first, with reference to the yeichen level of Fig. 3 lower Writing element attached to the swivel arm 30, which is assigned to it in any case, that> it in its pivoting movement in a rectilinear transverse movement is taken. For a better understanding, the following first refers to the in Fig. 6 received writing element shown in greater detail, which for the both writing processes (deceleration curve and braking force curve) are identical can be and otherwise also in an identical manner to whom both, the swivel writing movement through 11 levers is attached - the swivel lever for recording the Brake pedal force is denoted by 48 in FIG. 3.

Because the connection and assignment of the respective writing elements to the respective swivel arms or levers as well as their kinematics, bearing and functional sequence at the same time, together with straight-line guidance means, the linear recording process ensure, the straightening device will also be dealt with immediately. This consists of a straight guide bridge that can best be seen in the illustration in FIG. 3 49, formed by two lateral ones in the transverse direction to the paper transport direction extending webs 49a and 49b which form a sliding slot 50 between them, in which the two writing elements run, i.e. only one writing movement in cross direction. by using the respective pivot levers or pivoting levers are driven.

Each writing element 51, 52 is therefore constructed so that it consists of a upper half 53 and a lower half 54, which is a constriction between them or (annular) recess 55 form so that the two halves 53, 54 with upper and lower ring flanges the guide webs 49a, 49b of the straight guide bridge 49 include. In order to enable a safe run and a smooth gliding, is the connection of the writing element 51, 52 to the straight guide bridge 49 as smooth running formed bearings and comprises in the special case an interposed ball bearing 56.

As mentioned above, the diagram sheet is labeled or graphically marked from below, regardless of changing pressure or paper position conditions in that the actual pen 57 itself is under the even pressure a bias spring 58 is applied to the paper. To this end, the two form Writing element halves 53 and 54 have an inner sliding space or a cylindrical ring surface from, in which a piston-like thickened head 59 of the pen-S7- ~ under the Effect of the preload spring slides.

Also the drive connection of the respective writing element 51, 52 with the swivel arms or levers 30, 48 takes place as a smooth-running bearing via an interposed, another ball bearing 60, which, in completion of the straight-line guide device, in elongated holes 61, 62 of the swivel arms or Scllwenkhebel slides so that the at the pivoting occurring shortenings or extensions with reference to the predetermined linear path of the writing elements calculation by the straight guide bridge 49 can be worn. 6, the lower ball bearing 60 is through a attached washer 63 and a snap ring held.

T) he implementation of the applied brake pedal force takes place as at the beginning already mentioned briefly, by generating and supplying a correspondingly proportional Pressure via a connecting pressure hose 13, the junction of which in Fig. 3 with 13a is designated. The explanation is essentially made with reference to FIG Representation in FIGS. 3 and 5, FIG. 5 showing the implementation of the brake pressure at least proportional measuring pressure supplied to the device in the initial setting movement showing the components involved in an exploded view.

It is essential that, as with the implementation of the delay values that occur, the Brake pedal force in all areas and in all components involved in the implementation transferred as smoothly and authentically as possible and finally into the writing movement of the writing element 51 assigned to the pivot lever 48 is implemented will. A primary conversion of pressure into movement takes place in a converter approach 64 on the housing 10a of the combination device containing the components described so far, the transducer attachment 64 on the housing, for example, by means of a bayonet lock or another suitable quick release fastener.

The converter housing 64 forms a pressure chamber 65 and in this is a bellows, while avoiding the effects of friction 66 arranged, as it can best be found in the illustration of FIG. 5 loads. The pressure chamber 65 is closed by a cover 67 containing the pressure opening 13a, for example by means of screws 68 and it can be seen that the bellows 66, the Preferably a metal bellows made of stainless steel and more constant, more uniform Is a spring rate or spring constant that enables free movement without friction Distance to the inner wall of Druck.raun1s 65 maintains. Then moves with the appropriate Pressure increase in pressure chamber 65 of the bellows under the acting pressure in the Representation of Fig. 5 in the plane of the drawing to the right, then this movement a push rod 69 taken along inside the bellows so that it is in the transducer attachment 64 results in a primary actuating movement due to this pressure conversion.

With an end piece 69a of the push rod 69 is a pressure plate 70 its stem 71 connected, for example by inserting the stem 71 into a corresponding threaded hole of the push rod end 69a can be screwed in, which at the same time provides an adjustment option suffered. Printing punches 69 with the printing plate 70 attached to i1or move in a from the transducer attachment 64 through an inner bore guide, wherein in the lower Part of the guide lateral ilaltezapfen 72a, 72b are used, the bayonet-like Locking and fastening of the converter attachment 64 on the housing are used.

The transmission of this primary movement, as seen from the first bellows 66 is generated, takes place through the action of the pressure plate 70 on one further pressure transmission rod 73, which is in its own housing 74 within the Measuring mechanism housing IOa is arranged and of an identical or similar bellows 75 is surrounded. This second housing for the pressure transmission rod 73 is after open on the outside, so that when inserting the transducer attachment 65 of the pressure plate 70 on the Pressure transmission rod 73 comes to rest. At least the pressure transmission rod 73 is via a preload spring 76, which also applies an adjustable counterforce, spring loaded and held in position; she interspersed with her averted End of the bottom of the housing 74 and is on the shorter leg 48a of the writing movement hinged for the braking force causing pivot lever 48, the adjusting nut 77 is used for adjustment and zero point setting; it lies from the inside of the measuring mechanism seen from at the bottom of the housing 74, the pressure transmission rod 73, such as Incidentally, all other passage and sliding bores, friction-free in the stand is held to the housing bore which it penetrates, and with a centering takes place mainly via the preload spring 76. It goes without saying that the Bellows 66, 75 are sealed against the environment at normal internal pressure; the attachment of the bellows, which are open at the bottom, to the base parts of the converter attachment 64 or the housing 74 can be arranged there by gluing, for example, into a round bead Bearing plate take place, with known> 'metal adhesives such as Loctite, for example, can be used.

The pivot lever 48 is designed as a rigid toggle lever and is stationary and, for example, at the same level as the swivel arm 3 () for recording the delay values mounted on a post 78 with a cup bearing 79 in between. To transfer the actuating movement resulting from the transmission push rod 73 on the pivot lever 48, an intermediate pin 80 can be provided, which is in an eye 81 at the end of the Pressure transmission rod 73 sits and on the other hand in an elongated hole 82 on the shorter Leg 48a of the pivot lever 48 engages, where also here the Connection again as a smooth running bearing and therefore preferably with interposition a ball bearing 83 is hit. It can be seen here that the considerable Difference in length between the shorter leg 48a and a longer leg 48b of the pivot lever 48 also translates the primary through the pressure conversion generated adjusting movement in the transverse writing movement of the writing element 51 takes place.

It can also be seen that the arrangement or interposition of Ball bearings wherever there would otherwise be a loss of accuracy due to frictional influences would have to be accepted - by the way, also due to the particularly frictionless transformation of the brake pedal pressure in the adjustment movement - a special accuracy and Ease of movement is ensured by the features according to the invention, so that one in particular, a good recording of absolute values that are comparable with one another which are very important, for example, when comparing measurements or after repairs or also, applied to motor vehicles, for the detection of want to evaluate different tire influences, so where the differences come from compared tires can be relatively small and therefore only recorded and can be evaluated if at least the .xleß- and recording device works with special precision and the best repeat accuracy.

All in the description, the following claims and the drawing The features shown can be used individually or in any combination be essential to the invention with one another.

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Claims (15)

Claims 1. Combination device for simultaneous measurement and Recording of remote pedal force and assigned deceleration values for mobile devices Units, in particular vehicles, motor vehicles, railways, airplanes and the like. (Brake pedal force deceleration recorder), with a deceleration sensor and a Eremskraftfibertragungseinrichtung, their corresponding initial position movements can be recorded using writing elements on a continuous writing (diagram sheet) are, characterized in that daP for the linear recording of au the braking force or the curve progressions related to deceleration, straight-line guidance devices (49, 49a, 49b; 30, hl; 48, 62) provided and the respective, the initial setting movement of the Deceleration sensor (31) or the brake pedal pressure transducer (64, 66, 69, 73) the actuating means (30, 48) transmitting the writing elements (51, 52) are correspondingly assigned are. 2. Combination device according to claim 1, Jadub characterized in that the Writing elements (51, 52) in the form of in a (; eradfihrungsbrücke (50) with lateral Guide webs (59a, 59b) displaceable Gleitkuirper are formed. 3. Combination device according to claim 1 or 2, characterized in that that the guided between the guide webs (49a, 49b) of the straight guide bridge (49) Writing elements of a swivel arm each pivotable about a fixed pivot point (30) or pivot lever (48) are driven. 4. Komb inationsgerät.aact ~ one of claims 1 to 3, characterized in that that the rigid swivel arm for the implementation of the acting delay values its end facing away from the pivot point (32) is loaded with a weight (31) and a spring-preloaded counter-pressure arrangement (36) articulated on it is provided that the swivel arm in the opposite direction to that by the weight (31) when delays caused pivoting movement is supported. 5. Combination device according to claim 4, characterized in that the counter-pressure arrangement contains a compression spring (41) which can be adjusted in its preload. 6. Kornbin'tionsger9t according to claim 4 or 5, characterized in that that the counterpressure arrangement is articulated around a stationary pivot point (38) Guide rod (37) and a sliding sleeve (39) which are fixed to the pivot arm (30) is and in which the guide rod (37) depending on the weight-induced deflection immersed and that between the sliding sleeve (39) on the one hand and the hinged end area the clocking rod (37), on the other hand, the compression spring surrounding the guide rod (41) is arranged. 7. Combination device according to claim 6, characterized in that to adjust the compression spring preload of the sliding sleeve (39) via a thread Height-adjustable adjusting nut (44) is assigned on which the compression spring is located (41) is supported. 8. Combination device according to one or more of claims 1 to 7, characterized in that the writing and transmission means for recording the deceleration values or the brake pedal force in the measuring mechanism housing (IOa) lying next to each other are arranged such that on one in the transverse direction to the straight-line guide device (49, 69a, 49b) time-synchronously driven diagram sheet shows the respective curves are recorded simultaneously and on top of each other. 9. Combination device according to one of claims I to 8, characterized in that that the pressure transducer converts the brake pedal force into a primary actuating movement a housing (64) with a pressure chamber (65) to which one of the brake pedal force is proportional Measuring pressure is supplied and that a bellows is provided in the pressure chamber (65), which, under the effect of the applied pressure, jerks a connected I) rod (620) shifts. 10. Combination device according to claim 9, characterized in that the bellows a metallic bellows, preferably made of stainless stable with constant spring rate, which is sealed and frictionless against the inner wall of the pressure chamber (65) is held, the housing containing the pressure chamber (65) (64) is part of a transducer attachment which can be connected to the measuring mechanism housing (10a). 11. Combination device according to claim 1 (), characterized in that the primary push rod (69) within the bellows (66) is a transfer pressure part (Pressure plate 70 with pin 71), preferably depth-adjustable, - is assigned, wherein the pressure plate (70) on a further bellows (75) and one in its Inside arranged pressure transmission rod (73) acts within its own Part «ehäuses (74) arranged in the knife case (10a) and with a shorter leg (! 8a) of the writing element (51) for brake pedal force recording driving pivot lever (48) -is connected. t. 12. Combination device according to claim 11, characterized in that the transmission push rod (73) is spring-loaded with one over it Threaded adjusting nut (77) for preload adjustment and that the connection of the transmission rod end with the pivot lever (48) a smooth rotating sliding connection (Cup bearing 83 in elongated hole 82) is. 13. Combination device according to one of claims 1 to 12, characterized in that that the pivot lever (48) for the brake pedal force recording is a rigid toggle lever is, which is pivotable with its knee point on a bearing post (78), preferably is rotatably mounted via ball bearings (79) and at the end of its longer leg (40) rotatable, preferably via ball bearings (60), a protruding housing pin of the writing element (51) which is slidably displaceable in sliding gap (5 (r) of the Straight guide bridge (49), preferably via ball bearings (56), is held. 1. Konbinationsgerit according to one of claims 1 to 13, characterized in that that each writing element (51, 52), with its pen (57) facing up on the continuous diagram sheet and therefore describing it from below in the Straight guide bridge (49) is arranged and consists of two housing parts (53, 54), between them one of the two-sided guide webs (49a, 49b) of the straight guide bridge (49) with the interposition of a - ball bearing (56) taken constriction (55) form and that in the two housing halves (53, 54) the pen (57) is slidable Is mounted like a piston with constant spring preload. 15. Combination device according to one of claims 1 to 14, characterized in that that the respective diagram sheet (15) in an in Longitudinal direction in Housing running guide channel (15) can be pushed in and over by a motor driven transport and pressure rollers (16, 17) along the paper transport channel (15) can be transported up to an upwardly curved outlet opening (15b), wherein the writing elements (51, 52) for deceleration and brake pedal force from below on the running diagram sheet held in position by a pressure member (29) act.