DE2815399A1 - Auxiliary drive for motor vehicle - is intermittently driven by energy stored during normal use in spring or battery - Google Patents

Abstract

The auxiliary drive for the motor driven vehicle is coupled to the gearbox and transmission to move the vehicle a short distance without having to start the engine. The drive can be from the starter motor, a secondary motor, or from an energy store device such as a coiled spring. The drive is coupled to the transmission by a special clutch without any torque transferred to the engine.

Description

OBJECT OF THE INVENTION

The invention relates to a second drive system for motor vehicles with an internal combustion engine as the primary drive. The additional second drive enables the movement of the vehicle over short distances without starting the conventional one Internal combustion engine. The drive energy for the second drive comes from an energy store, which recharges itself again and again during normal driving.

APPLICATION AREAS AND BENEFITS As important leitmotifs for the future Development of the automotive industry, the following goals were highlighted at the IAA 1977: i) Increasing traffic safety 2) Relieving pollution of exhaust gases and noise 3) Saving energy Unfortunately, the actual development of road traffic as a result of increasing Traffic density does not meet these objectives. Especially the exhaust gas and noise pollution continue to increase in metropolitan areas. As a limitation of the individual Passenger traffic, or a shift to other, e.g. rail-bound traffic systems From today's perspective, the automobile must not represent realistic alternatives adapted to the environmental requirements.

Technical refinements have basically been sufficient for decades The basic technological conception of the car that has remained unchanged, but rather new overall or detailed solutions must also be found. The patent authors are of the opinion that with the use of the second drive system a significant Contribution to environmental protection and road safety is made.

U M W E L T S C H U T Z B E Z O G E N E V O R T E I L E D E S Z W E I T A N T R I E B S Y S T E M S The usefulness of the Observe the second drive system at taxi stands. As soon as the first car is in the Queue drives away, the following vehicles start to move up. On these Locations are constantly exposed to high levels of noise and exhaust gas nuisance at times assume unbearable proportions for passers-by and residents. As it is during the start-up process Noise and pollutant emissions are greatest, it would be through avoidance alone A large number of take-off processes significantly relieves the burden on the environment in urban areas achieved.

However, this is the possible scope with regard to the Environmental protection, far from exhausted. Every driver can get a multitude of them imagine situations in which the car is only moved a few meters must, with this so far starting the internal combustion engine with all negative Side effects was necessary.

Examples include: a) The motor vehicle is parked in an unfavorable way and to clear an exit or passage a few meters in front of or

reset.

b) In the evening, the motor vehicle must be taken from the parking lot in front of the front door the garage can be driven.

c) The vehicle is in a queue which is only Moved forward a few car lengths from time to time.

d) The vehicle can also turn off without starting the internal combustion engine be pulled out of the garage. This keeps the garage and house from the dangerous and annoying car exhaust fumes.

Another positive side effect is that the internal combustion engine many harmful cold starts are spared.

ROAD SAFETY RELATED PRECAUTIONS R I E B S Y S T E M S In addition to the environmental benefits, this second drive provides an important contribution in the field of road safety. Many dangerous situations or traffic obstructions arise because motor vehicles are on the road stay.

Possible reasons for this are, for example: a) An empty fuel tank b) A stalled engine no longer starts at the traffic lights. c) An engine defect d) Failure of the engine as a result of an accident In all of these cases a So far, it has not been possible to remove the car from the danger area on its own has had catastrophic consequences in many cases. With the help of the Motor-independent secondary propulsion system, however, will always be able to use the Clear the road quickly.

These few examples already show that the second drive system one brings about significant improvements in the areas of environmental protection and traffic safety.

With a comprehensive assessment of all the advantages of the new system It is also noted that the application also saves fuel i.e. energy occurs.

A U 5 F Ü H R U N G S B E I S P I E L E You can find an energy storage device, which absorbs energy while driving and is able to do so when the primary engine is switched off to move the motor vehicle over short distances. Mainly used as energy storage I) a spring or a spring package, II) an accumulator in connection with an electric motor in question. Since it is important for the commercial use of the patent, the technical The solution is to keep the effort as low as possible in conjunction with the accumulator to judge an electric motor more favorable, because here to the realization of the patent claim no additional units are required.

The starter battery of the motor vehicle and serves as an energy store as an electric motor, the starter. While normally the starter moves the engine without that power is transmitted to the wheels, must also be through a corresponding Mechanism can be achieved that it is also possible to use the power of the starter to transfer the wheels without turning the engine. This is detailed as follows Achieved: The complex between motor (i) and gear (5), consisting of a ring gear (3), flywheel (9), drive plate (8), pressure plate (10) and pressure bearing (6) (see Appendix i) is to be redesigned so that the power of the starter (2) over the Ring gear (3) can be transferred to the gear shaft (12) without the The flywheel (9) also turns. To make this possible, the ring gear (3) must be on Housing (14) are shrunk on, which is the slightly smaller flywheel (9 ') surrounds. This housing (14) is mounted on the flywheel (9 ') on the engine side and on the other hand by an axially displaceable, newly designed thrust bearing (6 ') centered. This thrust bearing (6 ') is grooved inside and out and carries an axial bearing (16, 17) on both sides. The inner grooves of the thrust bearing (6 ') fit into the extended grooves of the gear shaft (12 ') the outer grooves of the thrust bearing (6 ') engage in the internal teeth of the housing cover (15). This redesigned The thrust bearing (6 ') thus fulfills the function of the previous thrust bearing without restriction with the difference that alternative power transmissions are now possible: a) Starting the vehicle engine (1), with the clutch not being depressed here may b) Movement of the vehicle with an optionally engaged gear when actuated of the starter (2) and depressed clutch.

In case b) the starter (2) is not operated by means of Ignition key, but by pressing a button once via a relay circuit. (Circuit diagram the relay circuit, see Appendix 2). This circuit causes the starter (2) is switched off by pressing the brake pedal. Operating errors are thereby excluded, since the vehicle is braked in the way the driver is used to Way done. This relay circuit also causes the withdrawal the clutch pedal, the starter (2) is switched off and the momentum of the vehicle starts the engine (l) in a similar way to pushing or towing.

To secure these theoretical considerations and the driving behavior To test, the patent applicants have built a prototype. As a test vehicle A Mercedes Benz 190 D was chosen because it was a vehicle of this size proves the performance of the second drive system particularly well. In summary of the above, it should be noted that this is only the change fewer parts were necessary. These were in detail: 1) Flywheel (9) To all necessary parts in the unchanged clutch bell (4) of the test vehicle to accommodate, it was necessary to reduce the diameter of the flywheel (9). Then a bearing seat was turned on on the side facing the engine (1). For the serial application of the patent is merely a corresponding change in the Mold necessary. If balance mass would have been necessary, would have you can add the missing flywheel mass at the other end of the crankshaft (7). There the reduced flywheel mass may result in poorer heat dissipation As a result, the housing (14) described below with lamellar-like Holes are provided, which by ventilation of the heating of the flywheel (9 ') counteract.

2) Housing (14,15) A newly manufactured one now serves as the ring gear seat two-part housing (14, 15) consisting of housing pot (14) and cover (15).

With the housing cover (15) unscrewed, the flywheel (9 '), Assemble the drive plate (8) and pressure plate (10) in the usual way.

3) Thrust bearing (6 ', 16,17) (engagement bearing) The previous thrust bearing (6) is omitted and is replaced by a new component (6 ', 16, 17) in the aforementioned form.

4) Gear shaft (12 ') With the toothing of the gear shaft (12'), the grooves were extended so far that the necessary for the thrust bearing (6 ', 16,17) There is room for movement. To ensure perfect synchronization when switching To ensure that the gear shaft (12 ') should have as little flywheel mass as possible be burdened. Accordingly, the housing (14,15) must be as light as possible and that Bearings (13) have minimal bearing friction. The components of the prototype have this Requirements fulfilled.

If the second drive system is used in series, there are loads and the service life of the stressed units and bearings to be checked to ensure that they are faultless Function is permanently ensured.

F A H R T E S T S M I T D E M Z W E I T A N T R I E B The patent applicants have a long series of tests with the prototype to investigate driving behavior carried out. With this series of tests, the discharge behavior of the battery should be examined in particular while driving with the second drive with an optionally engaged gear, various Distances and ascending road surfaces are investigated The experiments were carried out in February 1978 at temperatures around freezing point. The measurements have shown that, for example, the discharge current for ground level locomotion of the vehicle up to 15 meters of the energy consumption of a cold start (preheating and start) of the primary motor. The power output of the battery is thus due to the charging current of the alternator after a short runtime of the primary engine replaced.

The trials were with a fully occupied vehicle (4 people) each carried out over a test stretch of 30 meters.

The tests have shown that the vehicle after a short Acceleration phase of 3 to 5 seconds moved at a constant speed. The discharge current was highest at the moment of take-off and decreased during the acceleration phase to a lower, constant value.

With the 4th gear engaged, a speed of 2.2 was at ground level Meters per second. The exact driving behavior in the individual gears is from the attached diagram (Appendix 3) it can be seen in which the unloading the battery is plotted as a function of the distance traveled.

Assuming that a normal starter battery is fully charged has a power reserve of 88 Ah = 316800 AS and one pro Meters of locomotion requires approx. 100 AS, this theoretically gives the possibility the vehicle at ground level with the help of the second drive system without intermediate charging to travel more than 3 km.

Since, however, the uninterrupted continuous discharge of a battery is known does not run linearly, this theoretical value is not to be expected in practice. The tests have shown that, in extreme cases, the battery does not need to be recharged the test vehicle over a third of the theoretical value, i.e.

about 1000 to 1500 meters can be moved with the help of the second drive can. Even after this extreme load on the vehicle battery, it was soon Battery recovery time is still possible to start the diesel engine.

Since the second propulsion system as listed in the patent description, is mainly designed for moving the vehicle over short distances, the long-distance tests were only carried out for the purpose of the limit load capacity of the system. The results show that the second propulsion system in the form described fully meet the requirements in practice.

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Claims (3)

P A T E N T A N S P R Ü C H E 1) Drive system for motor vehicles with an internal combustion engine as the primary engine and one that is independent of the primary engine Second drive for moving the motor vehicle over short distances, marked in that the power of the starter is transmitted to the wheels via the ring gear and gearbox can be without the primary motor is rotated, the ring gear of the Flywheel can be uncoupled. 2) Drive system for motor vehicles with an internal combustion engine as Primary engine, as well as a secondary drive independent of the primary engine for locomotion of the motor vehicle over short distances, characterized in that the force introduction, an electric motor fed by the accumulator, at any suitable point takes place between gear and wheels, preferably in motor vehicles with automatic Transmission. 3) Drive system for motor vehicles with an internal combustion engine as Primary engine, as well as a secondary drive independent of the primary engine for locomotion of the motor vehicle over short distances, characterized in that an energy store the drive energy for the second drive in the form of a spring or a spring assembly supplies, whereby the energy storage device is tensioned during normal driving, and the energy for the primary engine-independent locomotion of the motor vehicle by means of transmits a suitable transmission mechanism to the wheels.