阅读说明：本技术 车辆推进系统 (Vehicle propulsion system ) 是由 M·阿雷菲-西加罗蒂 H·德雷埃尔 于 2018-07-04 设计创作，主要内容包括：一种车辆推进系统,包括：燃机(2),其带有紧固到发动机的曲轴(4)的飞轮(3)。启动马达和发电机组合在一个电机(10)中,该电机具有：定子(11),所述定子刚性地连接至车架固定部件(8)并设置有绕组(23),所述绕组连接到所述装置(24),用于在电机的马达操作中从所述装置馈送有电能以及在电机的发电机操作中馈送电能到所述装置,以及转子(12),所述转子连接到飞轮(3),以使转子和飞轮关联于彼此旋转。定子和转子中的至少一个具有构件(14,15),所述构件突出入到另一个的凹部(17,18)中,以形成位于所述突出构件两侧上的用于转子和定子之间的磁通的气隙(19-22)。(A vehicle propulsion system comprising: a combustion engine (2) with a flywheel (3) fastened to the crankshaft (4) of the engine. The starter motor and the generator are combined in an electric machine (10) having: a stator (11) rigidly connected to the frame-fixed part (8) and provided with windings (23) connected to the means (24) for feeding electric energy from the means in motor operation of the electric machine and to the means in generator operation of the electric machine, and a rotor (12) connected to the flywheel (3) for rotating the rotor and the flywheel in relation to each other. At least one of the stator and the rotor has members (14, 15) projecting into recesses (17, 18) in the other to form air gaps (19-22) on both sides of the projecting member for magnetic flux between the rotor and the stator.)

1. A vehicle propulsion system comprising

An internal combustion engine (2) with a flywheel (3) fastened to a crankshaft (4) of the engine,

a starter motor which can be controlled to start the combustion engine, and

an electrical system comprising: a device (24) for storing electric energy and to which the starter motor is connected to be fed thereby, and a generator configured to generate electric energy which is transmitted to the device and to electrical equipment of the vehicle,

wherein the starter motor and the generator are combined in an electric machine (10) having: a stator (11) rigidly connected to the frame-fixed part (8) and provided with windings (23) connected to the device for feeding electric energy from the device in motor operation of the electric machine and to the device in generator operation of the electric machine, and a rotor (12) connected to the flywheel (3) for rotating the rotor and the flywheel in relation to each other,

characterized in that at least one of the stator (11) and the rotor (12) has a member (14, 15, 14', 15') projecting into a recess (17, 18, 17', 18') in the other to form air gaps (19-22, 19'-22') for the magnetic flux between the rotor and the stator on both sides of the projecting member.

2. A vehicle propulsion system according to claim 1, characterised in that the projecting members (14, 15) project parallel to the axis of rotation (16) of the flywheel (3) while forming a ring arranged concentrically with respect to the axis and received in recesses (17, 18), and that the projecting members and the recesses are ring-shaped as seen in the direction of the axis of rotation (16).

3. A vehicle propulsion system according to claim 1, characterised in that the projecting members (14', 15') project radially into radially oriented recesses (17', 18') with respect to the axis of rotation (16) of the crankshaft (4).

4. A vehicle propulsion system according to claim 3, characterised in that the projecting member (14', 15') has an outer edge (30) which concentrically surrounds the axis of rotation (16).

5. A vehicle propulsion system according to any preceding claim, characterised in that the at least one of the stator (11) and rotor (12) has at least two of the projecting members (14, 15, 14', 15') and the other has an equal number of the recesses (17, 18, 17', 18'), each recess receiving a respective projecting member.

6. A vehicle propulsion system according to any one of the preceding claims, characterised in that at least the rotor (12) of the electric machine is received within an annular space (7) defined by the outer circumferentially axially directed portion (6) of the flywheel (3).

7. Vehicle propulsion system according to any of the preceding claims, characterised in that the rotor (12) is connected to a flywheel (3) by means of a gear (13).

8. Vehicle propulsion system according to claim 7, characterised in that the rotor (12) is connected to the flywheel (3) by means of a planetary gear (13).

9. Vehicle propulsion system according to claim 8, characterised in that the sun gear (26) of the planetary gear (13) is fastened to the flywheel (3) and the ring gear (27) is fastened to the rotor (12).

10. A vehicle propulsion system according to any one of the preceding claims, characterised in that the vehicle propulsion system comprises a device controllable to vary the relation between the rotational speed of the flywheel (3) and the rotational speed of the rotor (12).

11. A vehicle propulsion system according to claims 8 and 10, characterised in that the device is controllable to change the relation by acting on a planetary gear (13).

12. Vehicle propulsion system according to any of the preceding claims, characterised in that the rotor (12) is provided with permanent magnets.

13. A motor vehicle, in particular a heavy wheeled motor vehicle, such as a bus or a truck, characterized in that it is provided with a propulsion system according to any one of the preceding claims.

Technical Field

The invention relates to a vehicle propulsion system comprising

An internal combustion engine with a flywheel fastened to the engine crankshaft,

a starter motor which can be controlled to start the combustion engine, and

an electrical system comprising: a device for storing electric energy and to which the starter motor is connected to be fed thereby, and a generator configured to generate electric energy to be transferred to the device and to electrical equipment of the vehicle.

The present invention is directed to such propulsion systems for all types of motor vehicles, although it is particularly directed to wheeled heavy motor vehicles, such as trucks and buses. For this purpose, the invention will be discussed hereinafter mainly in relation to heavy trucks and buses, in order to clarify the invention, but without thereby limiting the invention thereto.

When constructing motor vehicles, especially of these types, there have been and are being endeavored to make the components smaller and the space requirement less, which results in a propulsion system with a small-sized starter motor and generator, and which results in an increase in the current-to-vehicle-weight ratio. The consequences of this can be a reduced quality, and a very high temperature and a higher risk of fire. Although the starter motor and the generator are small in size, they together require a considerable amount of space since the generator must be driven by a separate belt.

Background

US 6278196B 1 discloses a vehicle propulsion system of the type defined in the introduction, in which a starter motor and a generator are combined in one electric machine, whereby weight and space are saved.

Disclosure of Invention

It is an object of the present invention to provide a vehicle propulsion system of the type known from the above-mentioned publication which is improved at least in some respects with respect to such known vehicle propulsion systems.

According to the present invention, this object is achieved by providing a vehicle propulsion system according to the appended claim 1.

Construction of an electric machine, the stator of which is rigidly connected to the frame fastening part and provided with windings connected to a device for feeding electric energy from said device in motor operation of the electric machine and to said device in generator operation of the electric machine, and a rotor connected to the flywheel for rotating the rotor and the flywheel in relation to each other, such that at least one of the stator and the rotor has a member projecting into a recess of the other for forming an air gap on both sides of said projecting member for magnetic flux between the rotor and the stator. The performance of the motor can be improved and the motor for a certain power transfer can be made more compact, thereby saving space. Thus, each air gap generates an additional torque, thereby increasing the torque transmittable by such a motor by increasing the number of said air gaps. The air gap is created by a member protruding into the recess making the design of the machine more compact.

According to one embodiment of the invention said at least one of the stator and the rotor has at least two said protruding members and the other has an equal number of said recesses, each recess receiving a respective protruding member. By selecting the number of such air gaps, a desired torque amplitude of the electrical machine can be obtained.

According to another embodiment of the invention, the protruding member protrudes parallel to the rotational axis of the flywheel while forming a ring arranged concentrically with respect to the axis and received in the recess, and the protruding member and the recess are ring-shaped as seen in the direction of the rotational axis. This annular design of the protruding members and the recesses makes it possible to obtain a high torque transferable between the stator and the rotor for a given motor size.

According to another embodiment of the invention, the protruding member protrudes radially into the radially oriented recess with respect to the rotational axis of the crankshaft. The protruding formations may then have an outer edge that concentrically surrounds the axis of rotation. This is another possible design of the protruding members and recesses, which may result in high torque for a given motor size.

According to another embodiment of the invention, at least the rotor of the electrical machine is received in an annular space, said annular space being defined by the outwardly wound axially directed portion of the flywheel. The use of said annular space, which is often present around the hub of the flywheel, to separate the hub with respect to the mass of the flywheel that is further from the axis of rotation of the flywheel, to obtain the required flywheel inertia to accommodate at least the rotor of the electric machine, results in a compact design of the vehicle propulsion system according to the invention.

According to another embodiment of the invention, the rotor is connected to the flywheel by means of a gear wheel, which means that the gear wheel can be selected to obtain a desired relation between the rotational speed of the flywheel and the rotational speed of the rotor.

According to another embodiment of the invention, the rotor is connected to the flywheel by means of a planetary gear. This results in that it is possible to vary the relation between the rotational speed of the flywheel, i.e. the crankshaft, and the rotor by acting on the planetary gear, so that the relation is adapted to the operating mode of the electric machine, i.e. the electric machine is operated as a motor or as a generator.

According to another embodiment of the invention, the sun gear of the planetary gear is fastened to the flywheel and the ring gear is fastened to the rotor. This constitutes a suitable way of arranging such a planetary gear, wherein the sun gear can be arranged on the hub of the flywheel.

According to another embodiment of the invention, the vehicle propulsion system comprises a device controllable to vary the relation between the rotational speed of the flywheel and the rotational speed of the rotor. Such a device makes it possible to change this relationship to adapt it to the actual operating mode of the motor.

According to another embodiment of the invention, the device is controllable to change said relationship by acting on a planetary gear.

According to another embodiment of the invention the rotor is provided with permanent magnets which promote high torque for a certain size of the machine.

The invention also relates to a motor vehicle of the kind set forth in the appended claims.

Further advantageous features and advantages of the invention emerge from the description below.

Drawings

The following is a detailed description of embodiments of the invention, which is cited as examples, with reference to the accompanying drawings.

In the figure:

fig. 1 is a sectional view schematically showing a propulsion system of a vehicle according to a first embodiment of the invention.

Fig. 2 is a view similar to fig. 1, showing parts of a rotor and a stator of an electric machine in a vehicle propulsion system according to a second embodiment of the invention.

Detailed Description

Fig. 1 schematically shows part of a vehicle propulsion system arranged in a vehicle 1, the vehicle propulsion system having a combustion engine 2 with a flywheel 3 fastened to a crankshaft 4 of the engine. The freewheel 3 has a central hub 5 and an outer part 6.

The flywheel is arranged in a housing 8 which is fastened to an engine cylinder 9 which is fastened in relation to the frame. The electric motor 10 is arranged inside the housing 8 and has a stator 11 rigidly connected to the housing. The rotor 12 is connected to the flywheel 3 through a planetary gear 13. In the case of a permanent magnet machine, the rotor may be provided with permanent magnets. However, other types of motors, such as synchronous motors, are also possible.

The stator is provided with two projecting members 14, 15 which project parallel to the axis of rotation 16 of the flywheel 3, while forming a ring arranged concentrically with respect to this axis and received in a recess 17, 18, respectively, of each rotor 12. This means that air gaps 19-22 are formed on opposite sides of the respective protruding member for the magnetic flux between the rotor and the stator.

Furthermore, the stator is provided with schematically shown windings 23 on each protruding member, and these windings are controlled by a control unit 29, which is connected to a means 24 for storing electrical energy, such as a 24V battery 25, through an inverter 28.

The sun gear 26 of the planetary gear is fastened to the flywheel 3 and the ring gear 27 is fastened to the rotor 12. Thus, the motor will be arranged almost completely inside the annular space 7 of the flywheel 3 and thus require a minimum of space.

When starting the combustion engine 2, electric energy will be fed from the battery 25 to the windings 23 of the stator 11 to drive the rotor 12 and thereby rotate the flywheel 3, while acting as a starter motor. Once the combustion engine is running, the electric machine can instead operate as a generator, feeding the electric energy from the stator windings to the battery 25 and the electrical equipment of the vehicle.

The number of air gaps so formed, the number of poles of the electrical machine and the ratio of the planetary gears can be selected to adapt the electrical machine to its operating requirements as a starter motor and generator.

Fig. 2 schematically shows the design of the rotor and stator of an electrical machine in a second embodiment of the invention, wherein the rotor 12' has protruding members 14', 15' protruding radially with respect to the axis of rotation. Projects radially with respect to the axis of rotation of the crankshaft into the radially oriented recesses 17', 18' of the stator to form axially oriented air gaps 19'-22' for the magnetic flux between the stator and the device. The projecting member has an outer edge 30 which concentrically surrounds the axis of rotation of the flywheel.

The invention is of course not in any way restricted to the embodiments described above, since many possibilities to modifications thereof would be apparent to a person with ordinary skill in the art without having to depart from the scope of the invention as defined in the appended claims.