Patent US3856121A successfully refreshed from Google Patents.
US3856121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronizing device for manually operated power transmission mechanism
Assignee: Nissan Motor Co Ltd
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Filing: 1973-06-11
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Granted: 1974-12-24
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Expires: 1993-06-11
Abstract
Abstract In order to provide an additional synchronizing power and an increased synchronizing efficiency during shifting to the first speed in a manually-operated power transmission mechanism, the synchronizing device comprises, in addition to those members which are usually in use, a baulk ring rotatable with the transmission mainshaft and a synchronizer ring rotatable with the first speed gear. The additional baulk ring and synchronizer ring are brought into friction engagement through their coned surfaces by thrust transfer means which transmits the pressure from the usual synchronizer clutch gear to the additional synchronizer ring across the first speed gear so that the frictional torque tending to produce synchronization between the first speed gear and the transmission mainshaft is achieved on both sides of the first speed gear with the resultant increase in the synchronizing power and efficiency achieved by the synchronizing device. Arrangements are further proposed to significantly lessen the manipulative effort required in moving the synchronizer clutch sleeve into coupling engagement with the synchronizer clutch gear after synchronism has been attained between the first speed gear and the transmission mainshaft.
Inventors
- 👤 K Usui
- 👤 E Abe
- 👤 I Hayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:26
CPC Classifications
F; F16; F16D; F16D23/00; F16D23/02; F16D23/04; F16D23/06; F16D2023/0618; F16D2023/0656
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
334 words
A synchronizing device particularly for a manually operated power transmission mechanism including a transmission mainshaft and a first speed gear rotatable on the mainshaft, which device comprises a synchronizer clutch hub rotatable with said mainshaft, a synchronizer clutch sleeve rotatable with and axially slidable on said synchronizer clutch hub, said synchronizer clutch sleeve having internal gear teeth and adapted to be axially moved from the outside of the synchronizing device, at least one locking member rotatable with and axially slidable on an inner peripheral wall of said synchronizer clutch sleeve, a synchronizer clutch gear located between said synchronizer clutch hub and said first speed gear and rotatable with and axially slidable on the first speed gear, said synchronizer clutch gear having a conical portion tapered toward said synchronizer clutch hub, a first baulk ring located between said locking member and said synchronizer clutch gear and having an inner conical surface matching said conical portion of said synchronizer clutch gear, said synchronizer clutch gear and said first baulk ring having external gear teeth which are in agreement with and located in line with said internal gear teeth of said synchronizer clutch sleeve, a synchronizer clutch ring located opposite to said synchronizer clutch gear across said first speed gear and rotatable with and axially slidable on the first speed gear, said synchronizer clutch ring having a conical portion which is tapered away from the first speed gear, a second baulk ring rotatable with the transmission mainshaft and having an inner conical surface matching said conical portion of said synchronizer clutch ring, thrust transfer means engageable at one end with said synchronizer clutch gear and at the other end with said synchronizer clutch ring across the first speed gear so that an axial pressure from the synchronizer clutch gear is transmitted to the synchronizer clutch ring when the synchronizer clutch gear is forced toward the ring speed gear, and resilient biasing means for urging said synchronizer clutch gear away from the first speed gear on the mainshaft.
Claim 2
Dependent Claim
334 words
A synchronizing device particularly for a manually operated power transmission mechanism including a transmission mainshaft and a first speed gear rotatable on the mainshaft, which device comprises a synchronizer clutch hub rotatable with said mainshaft, a synchronizer clutch sleeve rotatable with and axially slidable on said synchronizer clutch hub, said synchronizer clutch sleeve having internal gear teeth and adapted to be axially moved from the outside of the synchronizing device, at least one locking member rotatable with and axially slidable on an inner peripheral wall of said synchronizer clutch sleeve, a synchronizer clutch gear located between said synchronizer clutch hub and said first speed gear and rotatable with and axially slidable on the first speed gear, said synchronizer clutch gear having a conical portion tapered toward said synchronizer clutch hub, a first baulk ring located between said locking member and said synchronizer clutch gear and having an inner conical surface matching said conical portion of said synchronizer clutch gear, said synchronizer clutch gear and said first baulk ring having external gear teeth which are in agreement with and located in line with said internal gear teeth of said synchronizer clutch sleeve, a synchronizer clutch ring located opposite to said synchronizer clutch gear across said first speed gear and rotatable with and axially slidable on the first speed gear, said synchronizer clutch ring having a conical portion which is tapered away from the first speed gear, a second baulk ring rotatable with the transmission mainshaft and having an inner conical surface matching said conical portion of said synchronizer clutch ring, thrust transfer means engageable at one end with said synchronizer clutch gear and at the other end with said synchronizer clutch ring across the first speed gear so that an axial pressure from the synchronizer clutch gear is transmitted to the synchronizer clutch ring when the synchronizer clutch gear is forced toward the ring speed gear, and resilient biasing means for urging said synchronizer clutch gear away from the first speed gear on the mainshaft.
Claim 3
Dependent Claim
46 words
A synchronizing device as claimed in claim 1, in which said second baulk ring and said transmission mainshaft are circumferentially movable relative to each other by a distance substantially equal to one half of the pitch of said internal gear teeth of said synchronizer clutch sleeve.
Claim 4
Dependent Claim
148 words
A synchronizing device as claimed in claim 1, in which said thrust transfer means is axially movably received in a hole formed in said first speed gear throughout its thickness, said thrust transfer means comprising a plunger axially projecting toward said synchronizer clutch gear for being engaged by the clutch gear when the clutch gear is forced toward the first speed gear, a rigid ball member located at an end of said hole opposite to said plunger for engagement with said synchronizer ring when forced toward the synchronizer ring, and a stop member located between said plunger and said ball member for transmitting the pressure from the plunger to the ball member and limiting the movement of the plunger and the ball member toward the synchronizer clutch gear when the clutch gear is urged away from the first speed gear by the action of said resilient biasing means.
Claim 5
Dependent Claim
130 words
A synchronizing device as claimed in claim 1, in which said thrust transfer means is axially movably received in a hole formed in said first speed gear throughout its thickness, the transfer means comprising a plunger axially projecting out of said hole toward said synchronizer clutch gear for being engaged by the clutch gear when the clutch gear is forced toward the first speed gear and an abutment member located at an end of said hole and engageable at one end with said plungEr and at the other end with said synchronizer ring, said abutment member being operative to limit the movement of said plunger toward said synchronizer clutch gear when the clutch gear is forced away from the first speed gear by the action of said resilient biasing means.
Claim 6
Dependent Claim
33 words
A synchronizing device as claimed in claim 1, in which said resilient biasing means comprises an initially coned disc spring which is interposed between said synchronizer clutch gear and said first speed gear.
Claim 7
Dependent Claim
139 words
A synchronizing device as claimed in claim 1, in which said second baulk ring has formed in its inner peripheral wall a groove facing an outer peripheral surface of the transmission mainshaft and said mainshaft is formed with a groove which is in line with said groove in the second baulk ring circumferentially of the mainshaft, said grooves in the second baulk ring and the mainshaft being elongated circumferentially of the baulk ring and mainshaft to a length which is substantially equal to one half of the pitch of said internal gear teeth of said synchronizer clutch sleeve, wherein said second baulk ring is fitted on said transmission mainshaft through a ball received in said grooves so that the second baulk ring and said mainshaft is circumferentially movable relative to each other by a distance equal to said length.
Claim 8
Dependent Claim
103 words
A synchronizing device as claimed in claim 1, in which said second baulk ring has formed in its inner peripheral wall a recess facing an outer peripheral surface of the transmission mainshaft and in which said transmission mainshaft has formed on its outer peripheral surface a projection projecting into said recess, wherein said recess and said projection are so sized as to permit the recess and projection to move relative to each other circumferentially of the second baulk ring and the mainshaft by a distance substantially equal to one half of the pitch of the internal gear teeth of said synchronizer clutch sleeve.
Claim 9
Dependent Claim
139 words
A synchronizing device as claimed in claim 3, in which said second baulk ring has formed in its inner peripheral wall a groove facing an outer peripheral surface of the transmission mainshaft and said mainshaft is formed with a groove which is in line with said groove in the second baulk ring circumferentially of the mainshaft, said grooves in the second baulk ring and the mainshaft being elongated circumferentially of the baulk ring and mainshaft to a length which is substantially equal to one half of the pitch of said internal gear teeth of said synchronizer clutch sleeve, wherein said second baulk ring is fitted on said transmission mainshaft through a ball received in said grooves so that the second baulk ring and said mainshaft is circumferentially movable relative to each other by a distance equal to said length.
Claim 10
Dependent Claim
139 words
A synchronizing device as claimed in claim 4, in which said second baulk ring has formed in its inner peripheral wall a groove facing an outer peripheral surface of the transmission mainshaft and said mainshaft is formed with a groove which is in line with said groove in the second baulk ring circumferentially of the mainshaft, said grooves in the second baulk ring and the mainshaft being elongated circumferentially of the baulk ring and mainshaft to a length which is substantially equal to one half of the pitch of said internal gear teeth of said synchronizer clutch sleeve, wherein said second baulk ring is fitted on said trnasmission mainshaft through a ball received in said grooves so that the second baulk ring and said mainshaft are circumferentially movable relative to each other by a distance equal to said length.
Claim 11
Dependent Claim
103 words
A synchronizing device as claimed in claim 3, in which said second baulk ring has formed in its inner peripheral wall a recess facing an outer peripheral surface of the transmission mainshaft and in which said transmission mainshaft has formed on its outer peripheral surface a projection projecting into said recess, wherein said recess and said projection are so sized as to permit the recess and projEction to move relative to each other circumferentially of the second baulk ring and the mainshaft by a distance substantially equal to one half of the pitch of the internal gear teeth of said synchronizer clutch sleeve.
Claim 12
Dependent Claim
103 words
A synchronizing device as claimed in claim 4, in which said second baulk ring has formed in its inner peripheral wall a recess facing an outer peripheral surface of the transmission mainshaft and in which said trnasmission mainshaft has formed on its outer peripheral surface a projection projecting into said recess, wherein said recess and said projection are so sized as to permit the recess and projection to move relative to each other circumferentially of the second baulk ring and the mainshaft by a distance substantially equal to one half of the pitch of the internal gear teeth of said synchronizer clutch sleeve.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |