FIELD OF INVENTION
This invention relates to a reverse synchromesh system for shaft of vehicle. The
shaft is particularly two and half shaft without restricting scope of the
invention to the same.
PRIOR ART
In the known art, the power transmission in reverse direction, takes place in
two ways. Firstly, the reverse gear idler meshes with reverse gear of input
shaft. Secondly, the reverse gear idler engages with counter shaft reverse gear
resulting power transfer in reverse direction.
However, the abovementioned provisions are asociated with significant
blockage. This annoys the driver while driving in reverse gear.
Hence, it is required to develop reverse synchromesh system to address the
above drawack(s) .
OBJECTS OF THE INVENTION
An object of the present invention is to provide a reverse synchromesh system
which overcomes disadvantages associated with the prior art.
Another object of the present invention is to provide a reverse synchromesh
system which leads to smooth shifting of gears to reverse direction.
Another object of the present invention is to provide a reverse synchromesh
system which is reliable and efficient.
STATEMENT OF INVENTION
According to this invention, there is provided a reverse synchromesh system for
shaft of vehicle comprising a reverse helical gear on input shaft with a helical
gear on reverse shaft mounted with a synchronizer assembly.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Further objects and advantages of this invention will be more apparent from
the ensuing description when read in conjunction with the accompanying
drawings and wherein:
Fig. 1 shows: provision for the power transmission in reverse direction in the
prior art.
Fig. 2 shows: reverse synchromesh system of the present invention.
Fig. 3 shows: power flow in the system of the present invention.
Fig. 4 shows: reverse synchromesh system in neutral position according to the
present invention.
Fig. 5 shows: reverse synchromesh system wherein reverse gear in engaged
position according to the present invention.
' \ ( I
DETAILED DESCRIPTION OF THE INVENTION WITH REFERENCE TO THE
ACCOMPANYING DRAWINGS:
It is known to have provisions in the prior art for the power transmission in
reverse direction. Reference may be made to fig. 1. In this prior art, reverse
gear idler (B) meshes with reverse gear (A) of input shaft.
In another prior art, the reverse gear idler (B) engages with counter shaft
reverse gear (C) leading to power transfer in reverse direction.
As already discussed under prior art, both the provisions cause significant
blockage. Therefore, the present invention is directed to a reverse synchromesh
system for shaft of vehicle so as to obviate the drawback(s).
Now, referring to fig. 2, in which the reverse spur (A) on the input shaft is
converted to a helical gear (1). This reverse helical gear (1) on input shaft is in
constant mesh .with freely rotating helical gear (2) on reverse shaft. This freely
rotating helical gear (2) comprises dog teeth and cone for the purpose of
synchronization. On the same reverse shaft, a freely rotating synchronizer
assembly (3) is mounted, in which the sleeve has external spur gear. This Spur
gear on reverse synchronizer sleeve (3) is in constant mesh with spur gears on
the sleeve of Low speed synchronizer (4) mounted on the countershaft. When
the reverse gear synchrohizer (3) is engaged with the freely rotating dogged
helical gear on the reverse shaft, power is transmitted to the differentials via
countershaft. Power flow is as shown in the Fig 3.
Neutral Position:-
]
I This reverse helical gear (1) on input shaft is in constant mesh with freely
rotating helical gear (2) on reverse shaft & Spur gear on reverse synchronizer
sleeve (3) is in constant mesh with spur gears on the sleeve of Low speed
synchronizer (4) mounted on the countershaft.
Reverse gear in engaged position:
When the reverse gear synchronizer (3) is engaged with the freely rotating
dogged helical gear (2)on the reverse shaft, power is transmitted to the
differentials via countershaft.
Advantageous features
1. Elimination of blockage of gears
2. Smooth driving experience
3. Elimination of noise
4. Better shift feeling
Reference Numerals:
.l. Reverse Gear, Input Shaft
2. Reverse Gear, Reverse Shaft
3. Reverse Synchro Assy
4. Synchro Assy, Low Speed
5. Shaft, Reverse Gear
6. Input Shaft
7. Counter Shaft
8. 1st Gear, Input Shaft
9. 2nd Gear, Input Shaft
10. Final Gear, Countershaft
It is to be noted that the present invention is susceptible to modifications,
adaptations and changes by those skilled in the art. Such variant embodiments
employing the concepts and features of this invention are intended to be within
the scope of the present invention, which is further set forth under the
following claims:-
FIELD OF INVENTION
This invention relates to a reverse synchromesh system for shaft of vehicle. The
shaft is particularly two and half shaft without restricting scope of the
invention to the same.
PRIOR ART
In the known art, the power transmission in reverse direction, takes place in
two ways. Firstly, the reverse gear idler meshes with reverse gear of input
shaft. Secondly, the reverse gear idler engages with counter shaft reverse gear
resulting power transfer in reverse direction.
However, the abovementioned provisions are asociated with significant
blockage. This annoys the driver while driving in reverse gear.
Hence, it is required to develop reverse synchromesh system to address the
above drawack(s) .
OBJECTS OF THE INVENTION
An object of the present invention is to provide a reverse synchromesh system
which overcomes disadvantages associated with the prior art.
Another object of the present invention is to provide a reverse synchromesh
system which leads to smooth shifting of gears to reverse direction.
Another object of the present invention is to provide a reverse synchromesh
system which is reliable and efficient.
STATEMENT OF INVENTION
According to this invention, there is provided a reverse synchromesh system for
shaft of vehicle comprising a reverse helical gear on input shaft with a helical
gear on reverse shaft mounted with a synchronizer assembly.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Further objects and advantages of this invention will be more apparent from
the ensuing description when read in conjunction with the accompanying
drawings and wherein:
Fig. 1 shows: provision for the power transmission in reverse direction in the
prior art.
Fig. 2 shows: reverse synchromesh system of the present invention.
Fig. 3 shows: power flow in the system of the present invention.
Fig. 4 shows: reverse synchromesh system in neutral position according to the
present invention.
Fig. 5 shows: reverse synchromesh system wherein reverse gear in engaged
position according to the present invention.
' \ ( I
DETAILED DESCRIPTION OF THE INVENTION WITH REFERENCE TO THE
ACCOMPANYING DRAWINGS:
It is known to have provisions in the prior art for the power transmission in
reverse direction. Reference may be made to fig. 1. In this prior art, reverse
gear idler (B) meshes with reverse gear (A) of input shaft.
In another prior art, the reverse gear idler (B) engages with counter shaft
reverse gear (C) leading to power transfer in reverse direction.
As already discussed under prior art, both the provisions cause significant
blockage. Therefore, the present invention is directed to a reverse synchromesh
system for shaft of vehicle so as to obviate the drawback(s).
Now, referring to fig. 2, in which the reverse spur (A) on the input shaft is
converted to a helical gear (1). This reverse helical gear (1) on input shaft is in
constant mesh .with freely rotating helical gear (2) on reverse shaft. This freely
rotating helical gear (2) comprises dog teeth and cone for the purpose of
synchronization. On the same reverse shaft, a freely rotating synchronizer
assembly (3) is mounted, in which the sleeve has external spur gear. This Spur
gear on reverse synchronizer sleeve (3) is in constant mesh with spur gears on
the sleeve of Low speed synchronizer (4) mounted on the countershaft. When
the reverse gear synchrohizer (3) is engaged with the freely rotating dogged
helical gear on the reverse shaft, power is transmitted to the differentials via
countershaft. Power flow is as shown in the Fig 3.
Neutral Position:-
]
I This reverse helical gear (1) on input shaft is in constant mesh with freely
rotating helical gear (2) on reverse shaft & Spur gear on reverse synchronizer
sleeve (3) is in constant mesh with spur gears on the sleeve of Low speed
synchronizer (4) mounted on the countershaft.
Reverse gear in engaged position:
When the reverse gear synchronizer (3) is engaged with the freely rotating
dogged helical gear (2)on the reverse shaft, power is transmitted to the
differentials via countershaft.
Advantageous features
1. Elimination of blockage of gears
2. Smooth driving experience
3. Elimination of noise
4. Better shift feeling
Reference Numerals:
.l. Reverse Gear, Input Shaft
2. Reverse Gear, Reverse Shaft
3. Reverse Synchro Assy
4. Synchro Assy, Low Speed
5. Shaft, Reverse Gear
6. Input Shaft
7. Counter Shaft
8. 1st Gear, Input Shaft
9. 2nd Gear, Input Shaft
10. Final Gear, Countershaft
It is to be noted that the present invention is susceptible to modifications,
adaptations and changes by those skilled in the art. Such variant embodiments
employing the concepts and features of this invention are intended to be within
the scope of the present invention, which is further set forth under the
following claims:-

CLAIM:
1. A reverse synchromesh system for shaft of vehicle comprising a reverse
helical gear on input shaft with a helical gear on reverse shaft mounted
with a synchronizer assembly.
2. A reverse synchromesh system as claimed in claim 1, wherein the reverse
helical gear on the input shaft is in constant mesh with the freely
rotating helical gear.
3. A reverse synchromesh system as claimed in claim 1 or 2, wherein the
freely rotating helical gear is provided with dog teeth and cone for
synchronization.
4. A reverse synchromesh system as claimed in any of the preceding claims,
wherein the freely rotating synchronizer assembly having external spur
gear on its sleeve.
5. A reverse synchromesh system as claimed in claim 4, wherein the spur
gear on reverse synchronizer sleeve is in constant mesh with spur gears
on the sleeve of low speed synchronizer mounted on the countershaft. .
6. A reverse synchromesh system as claimed in any of the preceding claims,
wherein engagement of the reverse gear synchronizer with the freely
rotating dogged helical gear causes transmission of power to the
differentials.
7. A reverse synchromesh system as claimed in any of the preceding claims,
is associated with the advantageous features such as herein described.
8. A reverse synchromesh system for shaft of vehicle substantially as herein
described with reference to the accompanying drawings.