An oil pump includes pump chambers each having a volume varied by engine drive and for pressurizing oil inhaled through an inlet port and discharge it through an outlet port, and a branch passage connected between upstream and downstream sides of the outlet port at branch and confluent points, where
An oil pump includes pump chambers each having a volume varied by engine drive and for pressurizing oil inhaled through an inlet port and discharge it through an outlet port, and a branch passage connected between upstream and downstream sides of the outlet port at branch and confluent points, wherein the branch passage in the vicinity of the confluent point is shifted in pulse-pressure phase with respect to the outlet port.
대표청구항▼
What is claimed is: 1. An oil pump, comprising: a plurality of pump chambers each having a volume varied by engine drive, the pump chambers pressurizing oil inhaled through an inlet port and discharging it through a pump chamber outlet port; a main passageway connected between the pump chamber outl
What is claimed is: 1. An oil pump, comprising: a plurality of pump chambers each having a volume varied by engine drive, the pump chambers pressurizing oil inhaled through an inlet port and discharging it through a pump chamber outlet port; a main passageway connected between the pump chamber outlet port and a housing outlet port; a branch passage connected between upstream and downstream sides of the main passageway at branch and confluent points, the branch passage being in a vicinity of the confluent point and being shifted in pulse-pressure phase with respect to the main passageway; and a pair of throttles, wherein the pair of throttles consists of throttles respectively provided at upstream and downstream end portions of the branch passage, the throttles being smaller in cross-sectional area than a general section of the branch passage which continuously extends and connects between the pair of the throttles between a branch point and a confluent point of the main passageway and the branch passage, wherein the throttles are provided, with respect to the main passageway and the branch passage, in the branch passage. 2. The oil pump as claimed in claim 1, further comprising a balancer shaft which drives the oil pump, the balancer shaft rotating at speed twice as high as a crankshaft to cancel engine secondary vibrations. 3. The oil pump as claimed in claim 1, further comprising: a drive shaft; an inner rotor driven by the drive shaft, the inner rotor having an outer periphery formed with external teeth each including a trochoid curve; and an outer rotor disposed at the outer periphery of the inner rotor, the outer rotor being offset with respect to the inner rotor, the outer rotor having an inner periphery formed with internal teeth each including the trochoid curve, the internal teeth being meshed with the external teeth of the inner rotor. 4. The oil pump as claimed in claim 1, further comprising a pump housing, the pump housing comprising a base block and a cover block attached to a front face of the base block, wherein the main passageway and the branch passage are formed in half at a junction between the base block and the cover block, wherein the base block and the cover block are coupled together by a plurality of bolts. 5. The oil pump as claimed in claim 1, wherein the branch passage extends curvedly with respect to the main passageway, which extends linearly. 6. The oil pump as claimed in claim 1, wherein the branch passage has an end portion connected with an upper end portion of the main passageway. 7. An oil pump, comprising: a plurality of pump chambers each having a volume varied by engine drive, the pump chambers pressurizing oil inhaled through an inlet port and discharging it through a pump chamber outlet port; a main passageway connected between the pump chamber outlet port and a housing outlet port; a branch passage connected between upstream and downstream sides of the main passageway at branch and confluent points; and a pair of throttles, wherein the pair of throttles consists of throttles respectively provided at upstream and downstream end portions of the branch passage, the throttles being smaller in cross-sectional area than a general section of the branch passage which continuously extends and connects between the pair of the throttles between a branch point and a confluent point with the main passageway, wherein the main passageway and the branch passage have different distances between the branch point and the confluent point, wherein the throttles are provided, with respect to the main passageway and the branch passage, in the branch passage. 8. The oil pump as claimed in claim 7, further comprising a balancer shaft which drives the oil pump, the balancer shaft rotating at speed twice as high as a crankshaft to cancel engine secondary vibrations. 9. The oil pump as claimed in claim 7, further comprising: a drive shaft; an inner rotor driven by the drive shaft, the inner rotor having an outer periphery formed with external teeth each including a trochoid curve; and an outer rotor disposed at the outer periphery of the inner rotor, the outer rotor being offset with respect to the inner rotor, the outer rotor having an inner periphery formed with internal teeth each including the trochoid curve, the internal teeth being meshed with the external teeth of the inner rotor. 10. The oil pump as claimed in claim 7, further comprising a pump housing, the pump housing comprising a base block and a cover block attached to a front face of the base block, wherein the main passageway and the branch passage are formed in half at a junction between the base block and the cover block, wherein the base block and the cover block are coupled together by a plurality of bolts. 11. The oil pump as claimed in claim 7, wherein the branch passage extends curvedly with respect to the main passageway, which extends linearly. 12. The oil pump as claimed in claim 7, wherein the branch passage has an end portion connected with an upper end portion of the main passageway. 13. An oil pump, comprising: a plurality of pump chambers each having a volume varied by engine drive, the pump chambers pressurizing oil inhaled through an inlet port and discharging it through a pump chamber outlet port; a main passageway connected between the pump chamber outlet port and a housing outlet port; a branch passage connected between upstream and downstream sides of the main passageway at branch and confluent points; and a pair of throttles, wherein the pair of throttles consists of throttles respectively provided at upstream and downstream end portions of the branch passage, the throttles being smaller in cross-sectional area than a general section of the branch passage which continuously extends and connects between the pair of throttles between a branch point and a confluent point with the main passageway, wherein the throttles are provided, with respect to the main passageway and the branch passage, in the branch passage. 14. The oil pump as claimed in claim 13, further comprising a balancer shaft which drives the oil pump, the balancer shaft rotating at speed twice as high as a crankshaft to cancel engine secondary vibrations. 15. The oil pump as claimed in claim 13, further comprising: a drive shaft; an inner rotor driven by the drive shaft, the inner rotor having an outer periphery formed with external teeth each including a trochoid curve; and an outer rotor disposed at the outer periphery of the inner rotor, the outer rotor being offset with respect to the inner rotor, the outer rotor having an inner periphery formed with internal teeth each including the trochoid curve, the internal teeth being meshed with the external teeth of the inner rotor. 16. The oil pump as claimed in claim 13, further comprising a pump housing, the pump housing comprising a base block and a cover block attached to a front face of the base block, wherein the main passageway and branch passage are formed in half at a junction between the base block and the cover block, wherein the base block and the cover block are coupled together by a plurality of bolts. 17. The oil pump as claimed in claim 13, wherein the branch passage extends curvedly with respect to the main passageway, which extends linearly. 18. The oil pump as claimed in claim 13, wherein the throttles and the general section of the branch passage are adapted to attenuate a pulse pressure within the outlet port. 19. The oil pump as claimed in claim 13, wherein the branch passage has an end portion connected with an upper end portion of the main passageway.
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이 특허에 인용된 특허 (11)
Justen, Thomas R.; Lam, Edward K.; Meier, Peter W.; Moore, Donald, Air intake silencer.
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