GB2160027A

GB2160027A - A generator for vehicles

Info

Publication number: GB2160027A
Application number: GB08511709A
Authority: GB
Inventors: Wolfgang Burek
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 1984-05-10
Filing date: 1985-05-09
Publication date: 1985-12-11
Also published as: GB8511709D0; ES8608745A1; JPS60241747A; GB2160027B; DE3417307A1; ES542967A0

Abstract

A generator for vehicles has a rotor (5) which is journalled in a bearing plate (1) on the drive side, and a pump (20) which is disposed on the inside of the said bearing plate and whose pump rotor (21) is mounted on the rotor shaft (5) of the generator. <IMAGE>

Description

SPECIFICATION A generator for vehicles The invention relates to a generator for vehicles, and in particular, but not exclusively, to a threephase generator, having a rotor, one end of the shaft of which rotor carries a drive element and is journalled in a bearing plate.

in accordance with the invention, a generator for vehicles comprises a rotor and a rotor shaft, which carries a drive element at one end and which is journalled in a bearing plate, wherein a pump comprising a pump housing and a rotor is disposed on the inside of a bearing plate, the pump rotor being mounted on the rotor shaft.

This provides a compact structural unit comprising a generator and a pump which can be used for the delivery of liquid and gaseous media.

The compact structural unit resulting from these measures can be fitted in vehicles, particularly motor vehicles, in a very simple manner and has the important advantage that no special drive elements, such as transmissions or the like, are required for the pump, and that great durability is ensured.

In a further development of the invention, the pump housing surrounding the pump rotor is integrally connected to the bearing plate on the drive side, hence resulting in particularly high mechanical strength which is of importance when the structural unit is intended for use in vehicles. In a preferred embodiment, the pump housing accommodating the pump rotor is of hollow cylindrical construction and its end face remote from the drive element of the generator is covered by a bearing cover secured by clamping bolts which are inserted through the pump housing from the outside of the bearing plate.

By way of example only, a specific embodiment of the invention will now be described, with reference to the accompanying drawing, which is an axial longitudinal cross-section of an embodiment of generator for motor vehicles, according to the invention.

The generator illustrated in the Figure is a threephase generator and comprises a cup-shaped bearing plate 1 manufactured from cast aluminium and located at a drive side, an annular stator 2 secured in the bearing plate 1 and comprising a stack of sheet metal laminations, and a three-phase winding 3 fitted in radial slots (not illustrated) in the stator. Furthermore, the generator includes a claw pole rotor 4 on a rotor shaft 5. One end 6 of the rotor shaft 5 extends out of the bearing plate 1 where it is rotatably journalled in a first ball bearing 7 and carries a drive pulley 8 for driving the generator by the vehicle by means of a V-belt (not illustrated), or alternatively by a gear drive by means of a gear wheel (not illustrated) engaging teeth (not illustrated) on the rotor shaft.The other end of the rotor shaft carries two slip rings 10 and 11 and is journalled by means of a ball bearing 12 fitted in a second bearing plate 13 which covers the slip rings. The bearing plate 13 carries two heat sinks 14 having load current rectifiers 15 secured thereto, the ends 16 of the three-phase winding 3 being connected to the said rectifiers. Furthermore, the generator has a voltage regulator 17. An excitation current of such intensity that the output voltage of the generator taken from the rectifiers 15 remains constant at all rotational speeds of the generator occurring during practical operation, is fed by the voltage regulator 17 by way of the two slip rings 10 and 11 to the excitation winding 18 which is disposed concentrically of the rotor shaft 5 and which rotates together with the claw pole rotor 4.

In order to obtain a compact structural unit, a pump 20 intended for liquid or gaseous media is disposed on the inside of the bearing plate 1 at the drive side, and the rotor 21 of the pump is disposed directly on the rotor shaft 5. The pump 20 is a known vane pump and has a plurality of vanes 22, each vane being guided in a radial groove (not illustrated) of the pump rotor 21. When the generator and the pump rotor 21 are being driven, the vanes 22 abut against the wall 23 of the bore in the pump housing 24. The pump housing 24 is of hollow cylindrical construction and is integrally connected to the bearing plate 1 at the drive side. The axis of the bore in the pump housing is indicated at 25 in the drawing and is disposed eccentrically of the axis 26 of the rotor shaft 5.A bearing cover 27 is located on that free end face of the pump housing 24 which is remote from the drive pulley 8 and is tightened against the pump housing 24 by means of axially parallel clamping bolts 28 inserted through the pump housing from the free end face of the bearing plate 1, and thereby limits, in a simple manner, the axial play of the pump rotor in such a way that there is no need to provide special means for fixing the rotor.

The drawing shows two variants for axially fixing the pump rotor 21 between the inner race 30 of the ball bearing 7 and a spacer ring 31 abutting directly against the pole rotor 4.

In the first variant shown in the right-hand half of the sectional illustration, the pump rotor 21 is in the form of a cylindrical disc and is located between two spacer rings 33 and 34 disposed one at each end face of the pump rotor. In the second variant shown in the left-hand half of the sectional illustration, the pump rotor 21 has integral extensions 35 and 36 which fix the position of the pump rotor 21 relative to the ball bearing 7 and the pole rotor 4.

1. A generator for vehicles comprising a rotor and a rotor shaft, which carries a drive element at one end and which is journalled in a bearing plate, wherein a pump comprising a pump housing and a rotor is disposed on the inside of a bearing plate, the pump rotor being mounted on the rotor shaft.

2. A generator as claimed in claim 1, wherein the pump housing surrounding the pump rotor is integrally formed with the bearing plate.

3. A generator as claimed in claim 1 or 2,

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A generator for vehicles The invention relates to a generator for vehicles, and in particular, but not exclusively, to a threephase generator, having a rotor, one end of the shaft of which rotor carries a drive element and is journalled in a bearing plate. in accordance with the invention, a generator for vehicles comprises a rotor and a rotor shaft, which carries a drive element at one end and which is journalled in a bearing plate, wherein a pump comprising a pump housing and a rotor is disposed on the inside of a bearing plate, the pump rotor being mounted on the rotor shaft. This provides a compact structural unit comprising a generator and a pump which can be used for the delivery of liquid and gaseous media. The compact structural unit resulting from these measures can be fitted in vehicles, particularly motor vehicles, in a very simple manner and has the important advantage that no special drive elements, such as transmissions or the like, are required for the pump, and that great durability is ensured. In a further development of the invention, the pump housing surrounding the pump rotor is integrally connected to the bearing plate on the drive side, hence resulting in particularly high mechanical strength which is of importance when the structural unit is intended for use in vehicles. In a preferred embodiment, the pump housing accommodating the pump rotor is of hollow cylindrical construction and its end face remote from the drive element of the generator is covered by a bearing cover secured by clamping bolts which are inserted through the pump housing from the outside of the bearing plate. By way of example only, a specific embodiment of the invention will now be described, with reference to the accompanying drawing, which is an axial longitudinal cross-section of an embodiment of generator for motor vehicles, according to the invention. The generator illustrated in the Figure is a threephase generator and comprises a cup-shaped bearing plate 1 manufactured from cast aluminium and located at a drive side, an annular stator 2 secured in the bearing plate 1 and comprising a stack of sheet metal laminations, and a three-phase winding 3 fitted in radial slots (not illustrated) in the stator. Furthermore, the generator includes a claw pole rotor 4 on a rotor shaft 5. One end 6 of the rotor shaft 5 extends out of the bearing plate 1 where it is rotatably journalled in a first ball bearing 7 and carries a drive pulley 8 for driving the generator by the vehicle by means of a V-belt (not illustrated), or alternatively by a gear drive by means of a gear wheel (not illustrated) engaging teeth (not illustrated) on the rotor shaft.The other end of the rotor shaft carries two slip rings 10 and 11 and is journalled by means of a ball bearing 12 fitted in a second bearing plate 13 which covers the slip rings. The bearing plate 13 carries two heat sinks 14 having load current rectifiers 15 secured thereto, the ends 16 of the three-phase winding 3 being connected to the said rectifiers. Furthermore, the generator has a voltage regulator 17. An excitation current of such intensity that the output voltage of the generator taken from the rectifiers 15 remains constant at all rotational speeds of the generator occurring during practical operation, is fed by the voltage regulator 17 by way of the two slip rings 10 and 11 to the excitation winding 18 which is disposed concentrically of the rotor shaft 5 and which rotates together with the claw pole rotor 4. In order to obtain a compact structural unit, a pump 20 intended for liquid or gaseous media is disposed on the inside of the bearing plate 1 at the drive side, and the rotor 21 of the pump is disposed directly on the rotor shaft 5. The pump 20 is a known vane pump and has a plurality of vanes 22, each vane being guided in a radial groove (not illustrated) of the pump rotor 21. When the generator and the pump rotor 21 are being driven, the vanes 22 abut against the wall 23 of the bore in the pump housing 24. The pump housing 24 is of hollow cylindrical construction and is integrally connected to the bearing plate 1 at the drive side. The axis of the bore in the pump housing is indicated at 25 in the drawing and is disposed eccentrically of the axis 26 of the rotor shaft 5.A bearing cover 27 is located on that free end face of the pump housing 24 which is remote from the drive pulley 8 and is tightened against the pump housing 24 by means of axially parallel clamping bolts 28 inserted through the pump housing from the free end face of the bearing plate 1, and thereby limits, in a simple manner, the axial play of the pump rotor in such a way that there is no need to provide special means for fixing the rotor. The drawing shows two variants for axially fixing the pump rotor 21 between the inner race 30 of the ball bearing 7 and a spacer ring 31 abutting directly against the pole rotor 4. In the first variant shown in the right-hand half of the sectional illustration, the pump rotor 21 is in the form of a cylindrical disc and is located between two spacer rings 33 and 34 disposed one at each end face of the pump rotor. In the second variant shown in the left-hand half of the sectional illustration, the pump rotor 21 has integral extensions 35 and 36 which fix the position of the pump rotor 21 relative to the ball bearing 7 and the pole rotor 4. CLAIMS

3. A generator as claimed in claim 1 or 2, wherein the pump is a vane pump.

4. A generator as claimed in any of claims 1 to 3, wherein the pump housing accommodating the pump rotor is of hollow cylindrical construction and an end face of the pump housing remote from the drive element is covered by a bearing cover which is secured by clamping bolts inserted through the pump housing from the outside of the bearing plate.

5. A generator as claimed in claim 4, wherein the pump rotor has at least one extension formed thereon for the purpose of axially fixing the said pump rotor.

6. A generator as claimed in claim 4, wherein at least one spacer ring is provided for axially fixing the pump rotor.

7. A generator for vehicles, constructed and arranged substantially as herein described, with reference to, and as illustrated in, the accompanying drawing