Electric lawn mower having a sub frame supporting transaxles and motor drivers
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B60K-001/00
B60K-016/00
B60L-008/00
출원번호
US-0113460
(2011-05-23)
등록번호
US-8240414
(2012-08-14)
발명자
/ 주소
Sasahara, Kengo
Ebihara, Tomoyuki
Nakagaki, Mitsuhiro
Moriguchi, Kazuma
Matsumoto, Keiji
출원인 / 주소
Yanmar Co., Ltd.
대리인 / 주소
Sterne, Kessler, Goldstein & Fox P.L.L.C.
인용정보
피인용 횟수 :
13인용 특허 :
11
초록▼
An electric lawn mower includes a main frame, a mower deck supported by the main frame, a castor supported by the main frame, a sub frame, a pair of transaxles, and a pair of motor drivers. Each of the transaxles includes a transaxle housing, an electric motor disposed in the transaxle housing, a si
An electric lawn mower includes a main frame, a mower deck supported by the main frame, a castor supported by the main frame, a sub frame, a pair of transaxles, and a pair of motor drivers. Each of the transaxles includes a transaxle housing, an electric motor disposed in the transaxle housing, a single axle supported by the transaxle housing, and a drive wheel fixed on the axle outside of the transaxle housing. The motor drivers supply electric power to the respective motors of the respective transaxles. The sub frame, supporting the transaxles and the motor drivers, is connected to the main frame.
대표청구항▼
1. An electric lawn mower comprising: a main frame;a mower deck supported by the main frame;a castor supported by the main frame;a sub frame;a pair of transaxles, each of the transaxles including: a transaxle housing,an electric motor disposed in the transaxle housing,a single axle supported by the
1. An electric lawn mower comprising: a main frame;a mower deck supported by the main frame;a castor supported by the main frame;a sub frame;a pair of transaxles, each of the transaxles including: a transaxle housing,an electric motor disposed in the transaxle housing,a single axle supported by the transaxle housing, anda drive wheel fixed on the axle outside of the transaxle housing; anda pair of motor drivers for supplying electric power to the respective motors of the respective transaxles,wherein the sub frame, supporting the transaxles and the motor drivers, is connected to the main frame so as to have the transaxles and the motor drivers below the main frame. 2. The electric lawn mower according to claim 1, further comprising: a controller supported by the sub frame below the main frame so as to control the motor drivers. 3. The electric lawn mower according to claim 1, further comprising: a battery supported by the sub frame below the main frame so as to serve as an electric power source for the motor drivers. 4. The electric lawn mower according to claim 3, wherein the mower deck is supported by the main frame between the castor and the drive wheels, and wherein the battery is supported by the sub frame between the mower deck and the drive wheels. 5. The electric lawn mower according to claim 4, wherein the battery is supported by the sub frame between the transaxles. 6. The electric lawn mower according to claim 1, further comprising: a grass tank; anda grass-discharging duct extended from the mower deck to the grass tank and between the transaxles. 7. The electric lawn mower according to claim 1, each of the transaxles further including: a motor shaft of the motor supported in the transaxle housing and having a portion projecting outward from the transaxle housing; anda cooling fan provided on the portion of the motor shaft so as to be disposed adjacent to each of the motor drivers. 8. The electric lawn mower according to claim 1, wherein the transaxle housing of each of the transaxles is filled therein with oil, and incorporates the corresponding motor driver exposed to the oil in the transaxle housing. 9. The electric lawn mower according to claim 8, wherein each of the transaxles is provided with a cable whose connection to the motor and the motor driver is free from the oil in the transaxle housing. 10. The electric lawn mower according to claim 9, wherein the motor and the motor driver have respective portions connected to the cable outside of the transaxle housing of each of the transaxles. 11. The electric lawn mower according to claim 9, wherein the motor and the motor driver are provided with respective oil-resisting cable connection guides for guiding connection of the cable to the motor and the motor driver freely from the oil in the transaxle housing. 12. The electric lawn mower according to claim 1, wherein the main frame includes right and left portions so as to define an inner space of the main frame between the right and left portions when viewed in plan, and wherein the motor drivers are disposed in the inner space of the main frame when viewed in plan. 13. The electric lawn mower according to claim 12, wherein the electric motors of the respective transaxles are disposed in the inner space of the main frame when viewed in plan. 14. The electric lawn mower according to claim 13, wherein the motor drivers are disposed between the electric motors of the respective transaxles. 15. The electric lawn mower according to claim 14, wherein the sub frame is extended between the transaxles so as to incorporate the electric motors and the motor drives. 16. The electric lawn mower according to claim 14, wherein a battery is supported by the sub frame between the motor drivers. 17. The electric lawn mower according to claim 16, wherein the sub frame is extended between the transaxles so as to incorporate the electric motors, the motor drives and the battery. 18. The electric lawn mower according to claim 13, wherein the motor drivers are disposed above the respective electric motors of the respective transaxles. 19. The electric lawn mower according to claim 18, further comprising: a grass-discharging duct extended in the inner space of the main frame when viewed in plan from the mower deck and between the electric motors of the respective transaxles, wherein each of the electric motors and each of the motor drivers are disposed between the grass-discharging duct and each of the right and left portions of the main frame when viewed in plan. 20. The electric lawn mower according to claim 19, wherein a battery is supported by the sub frame in the inner space of the main frame when viewed in plan between the grass-discharging duct and the right or left portion of the main frame. 21. The electric lawn mower according to claim 19, wherein the sub frame includes a first portion extended between the transaxles above the grass-discharging duct so as to support the motor drives, and includes a pair of second portions each of which is extended downward from the first portion between the grass-discharging duct and each of the transaxles so as to support each of the electric motors. 22. The electric lawn mower according to claim 21, wherein the sub frame further includes a third portion extended forward or rearward from at least one of the second portions so as to support a battery in the inner space of the main frame when viewed in plan between the grass-discharging duct and the right or left portion of the main frame.
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