Vehicle mounted a.c. generator

Claim 2

A vehicle mounted a.c. generator, comprising: a rotor shaft (1) adapted to be driven by a vehicle engine; a rotor core (4) fixedly secured to said shaft and adapted to be excited by an exciting coil (9); a stator core (10) arranged oppositely to an outer periphery of said rotor core (4) and with a stator coil (11) mounted thereon; front (26) and rear (30) brackets for supporting said stator core (10) directly and said rotor shaft (1) indirectly through bearings (14, 15); a rectifier (16) for rectifying an output voltage generated in said stator coil (11); a voltage regulator (17) for regulating an output voltage of said rectifier (16) to a predetermined value; at least one annular coolant passage (32a, 32b) formed between said stator coil (11) and said brackets (26, 30); and a branch coolant passage (32c) formed along an end surface of said rear bracket (30), whereby said stator coil (11), said rectifier (16) and said voltage regulator (17) are cooled by circulating a liquid coolant through said coolant passages (32a, 32b, 32c).

Claim 3

The vehicle mounted a.c. generator as claimed in claim 1, further comprising a metal enclosure (24) for enclosing opposite end portions of said stator coil (11) and wherein said annular coolant passage (32a, 32b) is formed between said metal enclosure and said brackets (26, 30).

Claim 4

The vehicle mounted a.c. generator as claimed in claim 1, further comprising a cooling cover (33) attached to an outer side surface of said rear bracket (30), said rectifier (16) and voltage regulator (17) being mounted on an outer peripheral surface of said cooling cover (33), said branch coolant passage (32c) being formed between said rear bracket (30) and said cooling cover (33).

Claim 5

The vehicle mounted a.c. generator as claimed in claim 3, further comprising annular recesses (26a, 30e) formed in an area of an inner surface of said front bracket (26) and an area of an outer surface of said rear bracket (30) which surround said bearings (14, 15), respectively, said annular recesses (26a, 30e) being communicated with said annular coolant passage, whereby said bearings (14, 15) are cooled by liquid coolant flowing through said annular recesses (26a, 30e).

Claim 6

The vehicle mounted a.c. generator as claimed in claim 1, further comprising at least one through hole formed in said rear bracket (30) to communicate said annular coolant passage (32a) with said branch coolant passage (32c) to thereby branch said coolant.

Claim 7

The vehicle mounted a.c. generator as claimed in claim 1, wherein said liquid coolant is a portion of an engine coolant circulating through a coolant circulation system of said engine.

Claim 8

The vehicle mounted a.c. generator claimed in claim 2, further comprising a plurality of heat radiating fins (24a) protruding from said metal enclosure (24) into said annular coolant passage (32a).

Claim 9

The vehicle mounted a.c. generator as claimed in claim 3, further comprising a plurality of heat radiating fins (33a) protruding from said cooling cover (33) into said branch coolant passage (32c).

Claim 10

The vehicle mounted a.c. generator as claimed in claim 1, wherein said stator coil is enclosed in an enclosure (24) of an insulating synthetic resin material, opposite end portions of said enclosure (24) being liquid-tightly connected to said front (26) and rear brackets (30) to form said annular coolant passages (32a, 32b).

Claim 11

A vehicle mounted a.c. generator, comprising: a rotor shaft (1) adapted to be driven by a vehicle engine; a rotor core (4) fixedly secured to said rotor shaft (1); an exciting coil (9) arranged oppositely to an inner periphery of said rotor (1) for exciting; said rotor armature; a stationary core (23) for supporting said exciting coil (9); a stator core (10) arranged oppositely to an outer periphery of said rotor core (4) and mounting a stator coil (11) thereon; a front bracket (26) for supporting one end of said stator core (11) directly and said rotor shaft (1) indirectly through a bearing (14); a rear bracket (30) for supporting the other end of said stator core (11) directly and said rotor shaft (1) indirectly through a bearing (15), said stationary core (23) being fixedly secured to said rear bracket (30); a cooling cover (33) for covering a side end surface of said rear bracket (30) to form, together with said rear bracket (30), a branch coolant passage (32c); a rectifier (16) mounted to an outer periphery of said cooling cover (33); a voltage regulator (17) mounted to said outer periphery of said cooling cover (33); high thermal conductive members (51) coupled to said stationary core (23) and extending therefrom through said rear bracket (30) into said branch coolant passage (32c); an annular coolant passage (32a) formed between said stator coil (11) and said brackets (26, 30) for cooling said stator coil (11); said first cooling passage being for cooling said rectifier, said voltage regulator (17) and said exciting coil (9).

Claim 12

A vehicle mounted a.c. generator, comprising: a rotor shaft (1) adapted to be driven by a vehicle engine; a rotor core (4) fixedly secured to said rotor shaft (1); an exciting coil (9) arranged oppositely to an inner periphery of said rotor (1) for exciting; said rotor armature; a stationary core (23) for supporting said exciting coil (9); a stator core (10) arranged oppositely to an outer periphery of said rotor core (4) and mounting a stator coil (11) thereon; a front bracket (26) for supporting one end of said stator core (11) directly and said rotor shaft (1) indirectly through a bearing (14); a rear bracket (30) for supporting the other end of said stator core (11) directly and said rotor shaft (1) indirectly through a bearing (15), said stationary core (23) being fixedly secured to said rear bracket (30); a cooling cover (33) for covering a side end surface of said rear bracket (30) to form, together with said rear bracket (30), a branch coolant passage (32c); a rectifier (16) mounted to an outer periphery of said cooling cover (33); a voltage regulator (17) mounted to said outer periphery of said cooling cover (33); high thermal conductive members (51) coupled to said stationary core (23) and extending therefrom through said rear bracket (30) into said branch coolant passage (32c); an annular coolant passage (32a) formed between said stator coil (11) and said brackets (26, 30) for cooling said stator coil (11); said first cooling passage being for cooling said rectifier, said voltage regulator (17) and said exciting coil (9).

Claim 13

The vehicle mounted a.c. generator as claimed in claim 10, wherein said high thermal conductive members (51) are pressure contacted at one end thereof to a bobbin (9a) of said exciting coil (9).

Claim 14

The vehicle mounted a.c. generator as claimed in claim 10, wherein a portion of each of said high thermal conductive members (51) in said branch coolant passage (32c) is formed with a plurality of heat radiating fins (51a).

Claim 15

The vehicle mounted a.c. generator as claimed in claim 10, wherein each of said high thermal conductive members (51) comprises a heat pipe.

Claim 16

A vehicle mounted a.c. generator, comprising: a rotor shaft (1) adapted to be driven by a vehicle engine; a rotor core (4) fixedly secured to said rotor shaft (1); an exciting coil (9) arranged oppositely to an inner periphery of said rotor core (4) for exciting said rotor armature; a stationary core (23) for supporting said energizing coil (9); a stator core (10) arranged oppositely to an outer periphery of said rotor core (4) and with a stator coil (11) mounted thereon; a front bracket (26) for supporting one end of said stator core (10) directly and said rotor shaft (1) indirectly through a bearing (14); a rear bracket (30) for supporting the other end of said stator core (10) directly and said rotor shaft (1) indirectly through a bearing (15), said stationary core (23) being fixedly secured to said rear bracket (30); a cooling cover (33) for covering an end surface of said rear bracket (30) to form, together with said rear bracket (30), a branch coolant passage (32c) for cooling a rectifier (16) and a voltage regulator (17) mounted on said rear bracket (30) and said exciting coil (9); a coolant passage (23a) formed in said stationary core (23) and extending through said rear bracket (30) to said branch coolant passage (32c); and an annular coolant passage (32a) formed between said stator coil (11) and said brackets (26, 30) for cooling said stator coil (11).

Claim 17

A vehicle mounted a.c. generator, comprising: a rotor shaft (1) adapted to be driven by a vehicle engine; a rotor core (4) fixedly secured to said rotor shaft (1); an exciting coil (9) arranged oppositely to an inner periphery of said rotor core (4) for exciting said rotor armature; a stationary core (23) for supporting said energizing coil (9); a stator core (10) arranged oppositely to an outer periphery of said rotor core (4) and with a stator coil (11) mounted thereon; a front bracket (26) for supporting one end of said stator core (10) directly and said rotor shaft (1) indirectly through a bearing (14); a rear bracket (30) for supporting the other end of said stator core (10) directly and said rotor shaft (1) indirectly through a bearing (15), said stationary core (23) being fixedly secured to said rear bracket (30); a cooling cover (33) for covering an end surface of said rear bracket (30) to form, together with said rear bracket (30), a branch coolant passage (32c) for cooling a rectifier (16) and a voltage regulator (17) mounted on said rear bracket (30) and said exciting coil (9); a coolant passage (23a) formed in said stationary core (23) and extending through said rear bracket (30) to said branch coolant passage (32c); and an annular coolant passage (32a) formed between said stator coil (11) and said brackets (26, 30) for cooling said stator coil (11).

Claim 18

The vehicle mounted a.c. generator as claimed in claim 1, further comprising fins (60a) formed integrally with said rotor core (1), and wherein said front bracket (26) is formed around said bearing supporting portion thereof and in an outer periphery thereof with holes (26a, 26b) for passing air into and away from said front bracket (26) with a rotation of said shaft (1).

Claim 19

The vehicle mounted a.c. generator as claimed in claim 1, further comprising a cooling pipe (70, 71) provided in said rear bracket (30) for cooling said stator coil (11), said rectifier (16), said voltage regulator (17) and said bearing (15) associated with said rear bracket (30).