CA1056245A - Apparatus for driving engine balancers - Google Patents
Apparatus for driving engine balancersInfo
- Publication number
- CA1056245A CA1056245A CA259,455A CA259455A CA1056245A CA 1056245 A CA1056245 A CA 1056245A CA 259455 A CA259455 A CA 259455A CA 1056245 A CA1056245 A CA 1056245A
- Authority
- CA
- Canada
- Prior art keywords
- shaft
- balancer
- driving mechanism
- balancer shafts
- plural
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An apparatus for driving at least a pair of balancers which are disposed on both sides of an engine substantially parallel to the crank shaft and so arranged as to rotate in opposite directions at a speed twice the rotating speed of the crank shaft, comprising a gear shaft for reversing one of said balancers and a driving mechanism for driving the other balancer, camshaft by the crank shaft through a single timing belt or chain provided in the front or rear part of the cylinder block in order to dispose with the need of providing separate driving mechanisms for the cam-shaft and the balancers.
An apparatus for driving at least a pair of balancers which are disposed on both sides of an engine substantially parallel to the crank shaft and so arranged as to rotate in opposite directions at a speed twice the rotating speed of the crank shaft, comprising a gear shaft for reversing one of said balancers and a driving mechanism for driving the other balancer, camshaft by the crank shaft through a single timing belt or chain provided in the front or rear part of the cylinder block in order to dispose with the need of providing separate driving mechanisms for the cam-shaft and the balancers.
Description
` ~35~Z~S
_ PATENT SPECIFICATION
- 1. Title of the Invention Apparatus for Driving Engine Balancers :
: :
_ PATENT SPECIFICATION
- 1. Title of the Invention Apparatus for Driving Engine Balancers :
: :
2. Detailed Description of the Invention : This invention relates to improvements in apparatus for driving engine balancers.
.. .
For a conventional in-line four cylinders engine, . various means to eliminate vertical secondary vibromotive ` force so as to prevent the vibration of the engine have been proposed. But no apparatus has been available that ,:
eliminates secondary vibromotive momentum due to recipro-cating mass and vibromotive momentum due to explosion torque.
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..: .
,. , , .-.' :
In an engine of conventional type, as is commonly known, balancer driving mechanism is provided in the front part thereof, separate from timing gears for 1(~56Z45 camshaft. In addition, water pump, cooling fan and driving mechanisms such as dynamo are arranged tandem along the axis of the crankshaft. This not only increases the en-tire length of the engine, but also mal~es its assembly and maintenance complex since so many compenents as men-tioned above are placed in a very small space.
This invention is proposed to eliminate the afore-mentioned shortcomings. More particularly, the primary lo feature of this invention lies in an apparatus for driving engine balaneer in which at least a pair of balaneers are disposed on lines that are on both sides of, at desired distances, and substantially parallel to the axis of tne ; erank shaft. In this balancer driving mechanism, said pair of balaneers are at distanee from eaeh other with respect to the axis of the cylinders, and are so designed as to rotate opposite to each other, at a speed twiee the rotating speed of the cranlc shaft. A gear shaft re~ersing one of said pair of balancers and a driving mechanism driving the other balancer shaft, the camshaft and so on through a timing belt or a timing chain by means of the cran]c shaft are disposed in the front or rear part of the cyl-inder block.
Now this invention will be described in detail i624S
.: :
with reference to the accomp~nying drawings, in which:
~ig. 1 is a schematic view of an embodiment of this in-ven-tion, with a part thereof cut open. Fig. 2 is a - cross-sec-tional view as seen in the direc-tion of arrow s II-II in Fig. 1. Fig. 3 is a schematic view showing an ;; application of this invention, with a part thereof cut open. Fig. 4 is a cross-sectional view looking in the direction of arrow IV-IV in ~ig. 3. And Fig. 5 is a schematic view of another application of balancer driving mechanism according to this invention.
... .
;
;~ Referring first to Figs. 1 and 2, an embodlment of this invention will be described in detail.
~ ~ . . . .
;~; 15 A crank shaft 1 is fitted in a cylinder block 2.
., At least a pair of balancer shafts 3 and 4 are disposed on lines that are on both sides of, at desired distances, and substantially parallel to the axis of the cranls shaft 1. Said pair of balancer shafts 3 and 4 are at distance from each other with respect to the axis of the cylinders, and are so designed as to rotate opposite to each other, at a speed 2~ twice the rotating speed ~ of the crank shaft 1, as illustrated in Fig. 1.
: . i 25 Item 5 is a belt pulley fitted to the shaft 7 of ~3~
. ' ' , : , : : : ~ .
:' . . ~ . ' ~ .
' : ' ~ ~ ' ` ~ ` :.
'. ' - ' ' ' ' , ~OS~ 45 a reversing gear, not shown, that meshes with a gear 6 fitted to the balancer shaft 4. Reference numberal 8 denotes a belt pulley fitted to said balancer shaft 3, 9 a belt pulley fitted to a camshaft lO, ll a belt pulley fitted to said crank shaft l, 12 a timing belt engaged with said belt pulleys 5, 8 9 and ll and 13 and 14 an idler and a tension, respectively, of said timing belt 12.
Journals 19 and 20 of the crank shaft 1 are supported in bearings 21 and 22, respectively. A piston Z3 is fitted to the end of a connecting rod 24 supported by the crank shaft 1. Reference numeral 25 designates a flywheel, 26 a bell housing, 27 a timing gears case fitted in the ,; .
front part of the cylinder blocks 2, 28 a cooling fan op-erated by a belt driving mechanism 29 connected with the .
crank shaft 1, and 30 an oil pan.
In the embodiment of this invention thus composed, the balancer shafts 3 and 4 are driven, when the engine operates by the single timing belt 12 through the belt pulleys 5,8, 9 and 11. This dispenses with the need ~f providing separate driving mechanisms for the cam shaft and the balan-cers, different from the conventional apparatus. Accordingly the apparatus of this invention can be placed compactly in a small space in the frontpart of the engine, thus reducing its manufacturing cost lOS6Z45 .,, --and increasing its maintainabili-ty. F~lrthert it can eli-minate secondary vibromotive force and momentum due to reciprocating mass and explosion torque simultaneously and remar~ably. ~s is eviden-t from above, this invention ; 5 offers excellent operations and results.
:
Now an example in which the above-described em-bodiment of this invention is applied will be described ~ith reference to Figs. 3 and ~, wherein parts similar to those in Figs. 1 and 2 are designated by similar ref-; erence numerals.
In this example, the balancer driving mechanismof this invention is placed in the rear part 31 of the cylinder block, which was provided in the front part there-of in Figs. 1 and 2. This arrangement necessitates only expanding the bell housing 26 enclosing a clutch 32 up-ward as sho~m in Fig. 3, while making the timing gears case used in the conventional apparatus no longer nec-essary. Therefore, the entire length of the engine, inthe longitudinal direction of the crank shaft, can be reduced. Also, maintainability of the engine is improved because only the cooling fan and some auxiliary compo-nents such as the dynamo are provided in the front part of the engine.
' .
~5--.
~:
, . .
~nother example wherein the above-described em-bodiment of this invention is applied v~ill be explained vlith reference to Fig. 5, in which parts similar to those in Figs. 1 through 4 are designated by similar reference numerals.
In this second example, the mechanism for reversing ' one of the pair of balancer shafts ~ employed in the above-described emboidment is eliminated. Instead, as illus-.:
trated in Fig. 5, the belt pulley 5 is fitted to the balancer shaft 4, and a timing belt 36, having indenta-~ ... .
tions 33 and 34 on both sides, is used.
As shown in Fig. 5, the internal indentations 33 of said timing belt 36 are engaged with the belt pulley 8 on one of the pair of balancer shafts 3, while the ex-ternal indentations 34 thereof with the belt pulley 5 on the other balancer shaft 4, whereby said balancer shafts
.. .
For a conventional in-line four cylinders engine, . various means to eliminate vertical secondary vibromotive ` force so as to prevent the vibration of the engine have been proposed. But no apparatus has been available that ,:
eliminates secondary vibromotive momentum due to recipro-cating mass and vibromotive momentum due to explosion torque.
....
.' , .
..: .
,. , , .-.' :
In an engine of conventional type, as is commonly known, balancer driving mechanism is provided in the front part thereof, separate from timing gears for 1(~56Z45 camshaft. In addition, water pump, cooling fan and driving mechanisms such as dynamo are arranged tandem along the axis of the crankshaft. This not only increases the en-tire length of the engine, but also mal~es its assembly and maintenance complex since so many compenents as men-tioned above are placed in a very small space.
This invention is proposed to eliminate the afore-mentioned shortcomings. More particularly, the primary lo feature of this invention lies in an apparatus for driving engine balaneer in which at least a pair of balaneers are disposed on lines that are on both sides of, at desired distances, and substantially parallel to the axis of tne ; erank shaft. In this balancer driving mechanism, said pair of balaneers are at distanee from eaeh other with respect to the axis of the cylinders, and are so designed as to rotate opposite to each other, at a speed twiee the rotating speed of the cranlc shaft. A gear shaft re~ersing one of said pair of balancers and a driving mechanism driving the other balancer shaft, the camshaft and so on through a timing belt or a timing chain by means of the cran]c shaft are disposed in the front or rear part of the cyl-inder block.
Now this invention will be described in detail i624S
.: :
with reference to the accomp~nying drawings, in which:
~ig. 1 is a schematic view of an embodiment of this in-ven-tion, with a part thereof cut open. Fig. 2 is a - cross-sec-tional view as seen in the direc-tion of arrow s II-II in Fig. 1. Fig. 3 is a schematic view showing an ;; application of this invention, with a part thereof cut open. Fig. 4 is a cross-sectional view looking in the direction of arrow IV-IV in ~ig. 3. And Fig. 5 is a schematic view of another application of balancer driving mechanism according to this invention.
... .
;
;~ Referring first to Figs. 1 and 2, an embodlment of this invention will be described in detail.
~ ~ . . . .
;~; 15 A crank shaft 1 is fitted in a cylinder block 2.
., At least a pair of balancer shafts 3 and 4 are disposed on lines that are on both sides of, at desired distances, and substantially parallel to the axis of the cranls shaft 1. Said pair of balancer shafts 3 and 4 are at distance from each other with respect to the axis of the cylinders, and are so designed as to rotate opposite to each other, at a speed 2~ twice the rotating speed ~ of the crank shaft 1, as illustrated in Fig. 1.
: . i 25 Item 5 is a belt pulley fitted to the shaft 7 of ~3~
. ' ' , : , : : : ~ .
:' . . ~ . ' ~ .
' : ' ~ ~ ' ` ~ ` :.
'. ' - ' ' ' ' , ~OS~ 45 a reversing gear, not shown, that meshes with a gear 6 fitted to the balancer shaft 4. Reference numberal 8 denotes a belt pulley fitted to said balancer shaft 3, 9 a belt pulley fitted to a camshaft lO, ll a belt pulley fitted to said crank shaft l, 12 a timing belt engaged with said belt pulleys 5, 8 9 and ll and 13 and 14 an idler and a tension, respectively, of said timing belt 12.
Journals 19 and 20 of the crank shaft 1 are supported in bearings 21 and 22, respectively. A piston Z3 is fitted to the end of a connecting rod 24 supported by the crank shaft 1. Reference numeral 25 designates a flywheel, 26 a bell housing, 27 a timing gears case fitted in the ,; .
front part of the cylinder blocks 2, 28 a cooling fan op-erated by a belt driving mechanism 29 connected with the .
crank shaft 1, and 30 an oil pan.
In the embodiment of this invention thus composed, the balancer shafts 3 and 4 are driven, when the engine operates by the single timing belt 12 through the belt pulleys 5,8, 9 and 11. This dispenses with the need ~f providing separate driving mechanisms for the cam shaft and the balan-cers, different from the conventional apparatus. Accordingly the apparatus of this invention can be placed compactly in a small space in the frontpart of the engine, thus reducing its manufacturing cost lOS6Z45 .,, --and increasing its maintainabili-ty. F~lrthert it can eli-minate secondary vibromotive force and momentum due to reciprocating mass and explosion torque simultaneously and remar~ably. ~s is eviden-t from above, this invention ; 5 offers excellent operations and results.
:
Now an example in which the above-described em-bodiment of this invention is applied will be described ~ith reference to Figs. 3 and ~, wherein parts similar to those in Figs. 1 and 2 are designated by similar ref-; erence numerals.
In this example, the balancer driving mechanismof this invention is placed in the rear part 31 of the cylinder block, which was provided in the front part there-of in Figs. 1 and 2. This arrangement necessitates only expanding the bell housing 26 enclosing a clutch 32 up-ward as sho~m in Fig. 3, while making the timing gears case used in the conventional apparatus no longer nec-essary. Therefore, the entire length of the engine, inthe longitudinal direction of the crank shaft, can be reduced. Also, maintainability of the engine is improved because only the cooling fan and some auxiliary compo-nents such as the dynamo are provided in the front part of the engine.
' .
~5--.
~:
, . .
~nother example wherein the above-described em-bodiment of this invention is applied v~ill be explained vlith reference to Fig. 5, in which parts similar to those in Figs. 1 through 4 are designated by similar reference numerals.
In this second example, the mechanism for reversing ' one of the pair of balancer shafts ~ employed in the above-described emboidment is eliminated. Instead, as illus-.:
trated in Fig. 5, the belt pulley 5 is fitted to the balancer shaft 4, and a timing belt 36, having indenta-~ ... .
tions 33 and 34 on both sides, is used.
As shown in Fig. 5, the internal indentations 33 of said timing belt 36 are engaged with the belt pulley 8 on one of the pair of balancer shafts 3, while the ex-ternal indentations 34 thereof with the belt pulley 5 on the other balancer shaft 4, whereby said balancer shafts
3 and 4 and the camshaft 9 are driven by the motive power -~ 20 of the crank shaft 1. This arrangement may be provided ~ in both the front and rear parts of the cy~inder block 2 - depending on its design, as in the cases of Figs. 1 and 3.
In the aforesaid example, the balancer shafts 3 and 4 are rotated in opposite directions by a single ;`
', ., _ t, _ . ., `~ .
`
: 1056~45 timing belt, without employing any particular reversing mechanism. This lowers manufacturing cos-t, simplifies the structure of the balancer driving mechanism, and re-duces occurrence of troubles. So the same operations 5 and results as can be obtained from the aforesaid embodi-ment are expectable.
: Instead of the timing belt used in the above-men-tioned example, sprockets and a chain may be used. Also, the same operations and results can be obtained ~Ihen this invention is used for a horizontal engine.
. .
` 15 .
.
In the aforesaid example, the balancer shafts 3 and 4 are rotated in opposite directions by a single ;`
', ., _ t, _ . ., `~ .
`
: 1056~45 timing belt, without employing any particular reversing mechanism. This lowers manufacturing cos-t, simplifies the structure of the balancer driving mechanism, and re-duces occurrence of troubles. So the same operations 5 and results as can be obtained from the aforesaid embodi-ment are expectable.
: Instead of the timing belt used in the above-men-tioned example, sprockets and a chain may be used. Also, the same operations and results can be obtained ~Ihen this invention is used for a horizontal engine.
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` 15 .
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Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a four cylinder in-line engine with balancer system; a cam shaft which is driven by a crank shaft and determines the timing to open and close intake and exhaust valves, at least a pair of balancer shafts which are disposed on both sides of, at desired distances from, and substantially parallel to said crank shaft and separated from each other with respect to the axial direc-tion of the cylinders, and a driving mechanism which rotates said balancer shafts in opposite directions to each other at a speed twice the rotating speed of said crank shaft so that the lower one of said balancer shafts rotates in the opposite sense to the crank shaft, said driving mechanism being provided at one end of the row of cy-linders, and including a single positive driving elongated member which drives said cam shaft as well as said balancer shafts.
2. The four cylinder in-line engine according to claim 1, wherein said driving mechanism includes a gear shaft having an idler gear which meshes with a gear fitted to one of said balancer shafts, and furthermore said driving mechanism drives said gear shaft, the other balancer shaft and said cam shaft.
3. The four cylinder in-line engine according to claim 2, wherein said driving mechanism comprises plural sprockets and a single timing chain; said plural sprockets being provided on a gear shaft interlocking with one of said balancer shafts, on the other balancer shaft, on said cam shaft and on said crank shaft respectively; and said single timing chain being engaged with said plural sprockets.
4. The four cylinder in-line engine according to claim 2, wherein said driving mechanism comprises plural belt pulleys and a single timing belt; said plural belt pulleys being provided on a gear shaft interlocking with one of said balancer shafts, on said other balancer shaft, on said cam shaft and on said crank shaft re-spectively; and said single timing belt being engaged with said plural belt pulleys.
5. The four cylinder in-line engine according to claim 1, wherein said driving mechanism engages one of said balancer shafts with the internal side of said single positive driving elongated member and engages said other balancer shaft with the external side of said single positive driving elongated member so as to drive both balancer shafts in the opposite sense to one another.
6. The four cylinder in-line engine according to claim 5, wherein said driving mechanism comprises plural sprockets and a single timing chain; said plural sprockets being provided on both balancer shafts, on said cam shaft and on said crank shaft respect-ively, and said single timing belt being engaged with said plural sprockets.
7. The four cylinder in-line engine according to claim 5, wherein said driving mechanism comprises plural belt pulleys and a single timing belt; said plural belt pulleys being provided on both balancer shafts, on said cam shaft and on said crank shaft respectively; and said single timing belt having, on both sides of it, indentations engaging with said belt pulleys.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA259,455A CA1056245A (en) | 1976-08-19 | 1976-08-19 | Apparatus for driving engine balancers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA259,455A CA1056245A (en) | 1976-08-19 | 1976-08-19 | Apparatus for driving engine balancers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1056245A true CA1056245A (en) | 1979-06-12 |
Family
ID=4106689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA259,455A Expired CA1056245A (en) | 1976-08-19 | 1976-08-19 | Apparatus for driving engine balancers |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1056245A (en) |
-
1976
- 1976-08-19 CA CA259,455A patent/CA1056245A/en not_active Expired
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