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EP0243004A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Shift control device for a hydrostatic continuously variable transmission

Assignee: Honda Motor Co Ltd
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Filing: 1987-03-24
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Granted: —
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Expires: 2007-03-24
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Abstract

Abstract A shift control device in a hydrostatic continuously variable transmission in which a hydraulic closed circuit is formed between a swash plate type hydraulic pump and a swash plate type hydraulic motor, and a swash plate holder for supporting a motor swash plate of the hydraulic motor is tiltably supported on a stationary structure through a trunnion shaft (70) fixedly mounted to said swash plate, wherein a drive shaft (86a) of a reversible electric motor (86) is connected to the trunnion shaft through a reduction device (82) which is constructed so as to transmit rotation of the electric motor to the trunnion shaft at a reduced speed, but is brought into a locked state upon receipt of a reverse load from the trunnion shaft. This enables light adjustment of the tilting angle of the motor swash plate by use of a small-sized electric motor and reliable holding of the motor swash plate in a position at any angle.

Inventors

  • 👤 Tsutomu C/O K.K. Honda Gijutsu Kenkyusho Hayashi
  • 👤 Masaie C/O K.K. Honda Gijutsu Kenkyusho Katoh
  • 👤 Nobuyuki C/O K.K.Honda Gijutsu Kenkyusho Yakigaya
  • 👤 Kazuhiko C/O K.K.Honda Gijutsu Kenkyusho Nakamura
  • 👤 Yoshihiro C/O K.K.Honda Gijutsu Kenkyusho Yoshida
  • 👤 Yoshihiro K.K.Honda Gijutsu Kenkyusho Nakajima
  • 👤 Mitsuru C/O K.K. Honda Gijutsu Kenkyusho Saito
  • 👤 Akio C/O K.K. Honda Gijutsu Kenkyusho Kobayashi

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-02 08:56
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/42; F16H61/425

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 120 words
A hydrostatic continuously variable transmission in which a hydraulic closed circuit is formed between a swash plate type hydraulic pump and a swash plate type hydraulic motor, and a swash plate holder for supporting a motor swash plate of the hydraulic motor is tiltably supported on a stationary structure through a trunnion shaft fixedly mounted to said swash plate, including a shift control device wherein a drive shaft of a reversible electric motor is connected to the trunnion shaft through a reduction device which is constructed so as to transmit rotation of said electric motor to said trunnion shaft at a reduced speed but to be brought into a locked state when receiving a reverse load from said trunnion shaft.
Claim 2
Dependent Claim 120 words
A hydrostatic continuously variable transmission in which a hydraulic closed circuit is formed between a swash plate type hydraulic pump and a swash plate type hydraulic motor, and a swash plate holder for supporting a motor swash plate of the hydraulic motor is tiltably supported on a stationary structure through a trunnion shaft fixedly mounted to said swash plate, including a shift control device wherein a drive shaft of a reversible electric motor is connected to the trunnion shaft through a reduction device which is constructed so as to transmit rotation of said electric motor to said trunnion shaft at a reduced speed but to be brought into a locked state when receiving a reverse load from said trunnion shaft.
Claim 3
Dependent Claim 41 words
A hydrostatic continuously variable transmission according to claim 1, wherein said reduction device comprises a sector gear connected to the trunnion shaft and a worm gear meshed with said sector gear and connected to the drive shaft of said electric motor.
Claim 4
Dependent Claim 24 words
A hydrostatic continuously variable transmission according the claim 1 or 2, wherein said reduction device is connected to the trunnion shaft through a damper.
Claim 5
Dependent Claim 170 words
A hydrostatic continuously variable transmission according to claim 1, 2 or 3 wherein an operating lever is secured to the trunnion shaft and is operatively connected with a piston slidably received in a stationary cylinder, and first and second oil chambers defined between said cylinder and said piston and opposed to each other with the piston sandwiched there­between are interconnected through a hydraulic conduit, and wherein interposed in said hydraulic conduit is a control valve selectively switchable into a hold position in which said conduit is brought into a blocked state during an inoperative state of said electric motor, a decelerating position in which during normal rotation of said electric motor said conduit is brought into a state to communicate only in one direction from said first oil chamber to said second oil chamber and an accelerating position in which during reverse rotation of said electric motor the conduit is brought into a state to communicate only in one direction from said second oil chamber to said first oil chamber.

References Cited (Backward Citations)

DE1951381B2 Cited
DE2456473B2 Cited

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