阅读说明：本技术 摇臂轴 (Rocker arm shaft ) 是由 王硕宁 莫嘉林 陈惠娜 于 2019-08-29 设计创作，主要内容包括：本发明是一种摇臂轴；在该摇臂轴中设置有多段互不相通的液压油道,互不相通的液压油道的数量与摇臂轴对应控制配气的气缸个数相同,可通过每一段液压油道单独向一个变循环摇臂传递机油压力,从而使各气缸上的气门配气正时可被单独控制,以方便实现更精确的发动机气门控制。(The invention is a rocker shaft; the rocker arm shaft is provided with a plurality of sections of hydraulic oil ducts which are not communicated with each other, the number of the hydraulic oil ducts which are not communicated with each other is the same as the number of the cylinders of the rocker arm shaft for controlling the distribution of the gas, and the oil pressure can be independently transmitted to one variable cycle rocker arm through each section of the hydraulic oil duct, so that the valve distribution timing of each cylinder can be independently controlled, and the more accurate control of the engine valve can be conveniently realized.)

1. A rocker arm shaft; the method is characterized in that: the rocker arm shaft (111) is provided with a lubricating oil channel (110) and a plurality of sections of hydraulic oil channels (220) which are not communicated with each other; the hydraulic oil channel (222) is not communicated with the lubricating oil channel (110); a lubricating oil channel (110) communicated with the lubricating oil outlet (112); the section of rocker arm shaft (111) for controlling the air distribution of each cylinder is provided with an independent hydraulic oil passage (220); the section of hydraulic oil channel (220) is provided with a hydraulic oil inlet hole (221) and a hydraulic oil outlet hole (222).

A technical field

The invention relates to a rocker arm shaft which has more functions than the known rocker arm shaft with a pressure oil channel and more accurate gas distribution control of each cylinder of an engine.

Second, background Art

At present, a rocker shaft with a transmission hydraulic oil passage is known as a rocker shaft in a Honda variable valve lift engine; the disadvantages of the rocker shaft are: in the hydraulic oil transfer passage in the rocker shaft, a hydraulic oil inlet is communicated with each hydraulic oil outlet, and once hydraulic oil transfer occurs, the working state of the valve mechanism on each cylinder must be changed simultaneously.

Third, the invention

In order to overcome the defect that the hydraulic oil inlet is communicated with each hydraulic oil outlet in the hydraulic oil transfer passage in the prior rocker arm shaft, the invention provides a rocker arm shaft which can realize that a valve actuating mechanism on each cylinder comprises: the function of changing the operating state individually under the hydraulic control individually.

The technical scheme adopted by the invention is as follows: the rocker arm shaft is provided with a plurality of lubricating oil outlet holes for providing lubricating oil for the rocker arms and a lubricating oil channel communicated with the plurality of oil outlet holes, and the number of the lubricating oil outlet holes is the same as that of the rocker arms arranged on the rocker arm shaft; the rocker arm shaft is provided with a rocker arm shaft, a plurality of hydraulic oil ducts which are not communicated with each other are also arranged, the number of the hydraulic oil ducts which are not communicated with each other is the same as that of the cylinders for controlling gas distribution corresponding to the rocker arm shaft, and each hydraulic oil duct is provided with a hydraulic oil inlet hole and a hydraulic oil outlet hole; each section of hydraulic oil duct is not communicated with the lubricating oil duct. The rocker arms are arranged on the rocker arm shaft, an oil channel opening in the rocker arm with the oil channel is opposite to a hydraulic oil outlet hole of the rocker arm shaft, the rocker arm shaft is arranged in a rocker arm shaft seat hole on the rocker arm support, a hydraulic oil inlet hole is opposite to an oil inlet screw hole on the rocker arm shaft support, a guide head of an oil inlet bolt is inserted into the hydraulic oil inlet hole to be screwed tightly, the rocker arm shaft is pressed tightly through a pressing plane of the oil inlet bolt, and the oil inlet bolt is locked on the rocker arm shaft support by a locking nut. The rocker shaft bracket is mounted on the cylinder head in the same manner as the existing rocker shaft bracket.

When the engine runs in a four-stroke cycle, no hydraulic oil enters the hydraulic oil duct from the bolt oil duct and the hydraulic oil inlet hole of the oil inlet bolt, and therefore no hydraulic oil is output from the hydraulic oil outlet hole through the hydraulic oil duct.

When the engine needs to be in non-four-stroke circulation, after hydraulic oil is pumped into the hydraulic oil duct from the hydraulic oil inlet hole through the bolt oil duct of the oil inlet bolt, the hydraulic oil is output through the hydraulic oil outlet hole of the hydraulic oil duct and is pumped into the oil duct in the rocker arm through the oil duct opening in the rocker arm.

The invention has the advantages of simple structure and capability of independently controlling the work of the air distribution mechanism of each air cylinder by matching with a hydraulic oil supply system.

Description of the drawings

The invention will be further described with reference to the accompanying drawings in which:

FIG. 1 is a schematic diagram showing the relative positions of oil holes of a rocker arm shaft according to the present invention.

Fig. 2 is a schematic cross-sectional view of a rocker shaft of the present invention taken along the direction Y1, Y2, perpendicular to the axial direction.

Fig. 3 is a schematic sectional view of a rocker shaft of the present invention taken along the direction Y3, Y4 perpendicular to the axial direction.

Fig. 4 is a schematic end view of a rocker shaft support of the present invention.

Fig. 5 is a schematic view of an oil passage positioning bolt and a fastening nut of the present invention.

Fig. 6 is a schematic cross-sectional view of the oil passage positioning bolt of the present invention in the axial direction.

FIG. 7 is a schematic diagram of the position relationship between the bamboo joint type hydraulic oil duct rocker arm and the rocker arm with the oil duct after installation.

Fig. 8 is a schematic sectional view of the rocker arm shaft of the present invention, taken along the direction X1 and X2, parallel to the axial direction of the rocker arm shaft, after the rocker arm shaft and the rocker arms are mounted.

In the figure; 1. a camshaft, 2, a first exhaust cam, 3, a variable cycle cam, 4, a second exhaust cam, 5, a first exhaust valve rocker arm, 6, a variable cycle rocker arm, 7, a second exhaust valve rocker arm, 10, a timing piston, 11, a first synchronizing piston, 13, a first positioning float table, 14, a second synchronizing piston, 15, a second positioning float table, 16, an oil duct, 17, a return spring, 18, a blocking piston, 20, a blocking piston hole, 21, a first synchronizing piston hole, 24, a positioning plane, 25, a second synchronizing piston hole, 110, a lubricating oil duct, 111, a rocker shaft, 112, a lubricating oil outlet hole, 220, a hydraulic oil duct, 221, a hydraulic oil inlet hole, 222, a hydraulic oil outlet hole, 331, a rocker shaft bracket, 332, a rocker shaft bracket hole, 333, an oil inlet screw hole, 441, an oil inlet bolt, 442, an oil duct interface, 443, a bolt head, 444, threads, a pressing plane, 446, a positioning head, 447. bolt oil duct 551, lock nut.

Detailed description of the preferred embodiments

The rocker arm shaft (111) is provided with a lubricating oil channel (110) and a plurality of sections of hydraulic oil channels (220) which are not communicated with each other; the lubricating oil channels (110) are communicated with all the lubricating oil outlets (112), and the number of the lubricating oil outlets (112) is the same as that of the rocker arms arranged on the shaft of the bamboo joint type hydraulic oil channel rocker arm (111); the number of the hydraulic oil ducts (220) which are not communicated with each other is the same as the number of cylinders which correspondingly control air distribution of the rocker arm shaft (111), and each section of the hydraulic oil duct (220) is provided with a hydraulic oil inlet hole (221) and a hydraulic oil outlet hole (222).

A rocker shaft corresponding to each section of the hydraulic oil duct (220) is correspondingly provided with a first exhaust valve rocker (5), a second exhaust valve rocker (7) and a variable cycle rocker (6), and the installation and the matching are clearance fit; the port of the oil passage (16) in the first exhaust valve rocker arm (5) is opposite to the hydraulic oil outlet hole (222) of the rocker arm shaft (111). The rocker shaft (111) is arranged in a rocker shaft seat hole on the rocker arm bracket (331), a rocker shaft bracket (331) is correspondingly arranged at the part of a hydraulic oil inlet hole (221) of each hydraulic oil channel (220), the hydraulic oil inlet hole (221) is opposite to an oil inlet screw hole (333) on the rocker arm shaft bracket (331), a guide head (446) of an oil inlet bolt (441) is inserted into the hydraulic oil inlet hole (221) to be screwed, the rocker shaft (111) is pressed through a pressing plane (445) of the oil inlet bolt (441), and the oil inlet bolt (441) is locked on the rocker shaft bracket (331) by a locking nut (551). The rocker shaft bracket (331) is mounted on the cylinder head in the same manner as the conventional rocker shaft bracket.

As shown in fig. 1, the rocker arm shaft (111) is provided with a plurality of lubrication oil outlet holes (112) for supplying lubricating oil to the rocker arms, and a plurality of hydraulic oil inlet holes (221) and a plurality of hydraulic oil outlet holes (222).

As shown in fig. 2, the rocker arm shaft (1) is provided with a hydraulic oil passage (220) and lubricating oil (110), the diameter of the rocker arm shaft (1) is D1,

as shown in fig. 3, the rocker arm shaft (111) is provided with a plurality of hydraulic oil passages (220) which are not communicated with each other, and each section of hydraulic oil passage (220) is provided with a hydraulic oil inlet hole (221) and a hydraulic oil outlet hole (222); the diameter of the hydraulic oil inlet hole is D4.

As shown in fig. 4, the rocker shaft holder (331) is provided with a rocker shaft seat hole (332) and an oil inlet screw hole (333). The diameter of the rocker shaft seat hole (332) is D2, and D2 is more than or equal to D1.

As shown in fig. 5, the oil inlet bolt (441) is provided with an oil passage interface (442), a bolt head (443), a thread (444), a pressing plane (445) and a positioning head (446), and the thread (444) of the oil inlet bolt (441) can be screwed into the locking nut (551); the diameter of the compacting plane (445) is D5, and D5 > D4; the diameter of the positioning head (446) is D3, and D4 is more than or equal to D3.

As shown in fig. 6, the oil intake bolt (441) is provided with a bolt oil passage (447).

As shown in fig. 7, after the first exhaust valve rocker arm (5) is mounted on the rocker shaft (111), when one end is driven by the first exhaust cam (2) to lift, the other end jacks the exhaust valve downwards, the first exhaust valve rocker arm (5) is provided with a first synchronizing piston hole (21), the first synchronizing piston hole (21) is communicated with the oil channel (16), and the hydraulic oil outlet hole (222) is relatively communicated with the port of the oil channel (16).

As shown in fig. 8, the first exhaust cam (2) and the second exhaust cam (4) function as; a first exhaust valve rocker arm (5) and a second exhaust valve rocker arm (7) are respectively driven during an exhaust stroke; the variable cycle cam (3) has the following functions: the variable cycle rocker arm (6) is driven when the engine is in the original compression stroke and the original expansion stroke; the first exhaust valve rocker arm (5), the second exhaust valve rocker arm (7) and the variable cycle rocker arm (6) are all arranged on a rocker arm shaft (111) and are in clearance fit; a hydraulic oil outlet hole (222) is formed in a hydraulic oil duct (220) of the rocker shaft (111) and is opposite to an oil duct (16) opening in the first exhaust valve rocker arm (5), a timing piston (10) and a first synchronous piston (11) are installed in the first synchronous piston hole (21), a first positioning floating platform (13) is arranged on the first exhaust valve rocker arm (5), and when the first synchronous piston (11) does not enter the second synchronous piston hole (25) and the variable circulating rocker arm (6) is in a state of not being connected with the thixotropic circulating cam (3), the first positioning floating platform (13) is in contact with a positioning plane (24) on the variable circulating rocker arm (6), so that the center lines of the first synchronous piston hole (21) and the second synchronous piston hole (25) in the variable circulating rocker arm (6) coincide. And a second positioning floating platform (15) and a blocking piston hole (20) are arranged on the second exhaust valve rocker arm (7), when the second synchronous piston (14) does not enter the blocking piston hole (20), and the variable circulating rocker arm (6) is in a state of not being connected with the thixotropic circulating cam (3), the second positioning floating platform (15) is in contact with a positioning plane (24) on the variable circulating rocker arm (6), so that the second synchronous piston hole (25) is superposed with the central line of the blocking piston hole (20), and a blocking piston (18) and a return spring (17) are arranged in the blocking piston hole (20).

The working process of the invention is as follows:

1. when no hydraulic oil enters the hydraulic oil passage (220) through the bolt oil passage (447) and the hydraulic oil inlet hole (221), no hydraulic oil is output from the hydraulic oil outlet hole (222) through the hydraulic oil passage (220). So that no oil pressure acts on the timing piston (10), the blocking piston (18) intercepts the second synchronizing piston (14) outside the blocking piston bore (20) under the action of the return spring (17), and at the same time, the second synchronizing piston (14) intercepts the first synchronizing piston (11) outside the second synchronizing piston bore (25); due to the limited length of the return spring (17), the blocking piston (18) does not enter the second synchronizing piston hole (25), so that the second synchronizing piston (14) does not enter the first synchronizing piston hole (21), and the first exhaust valve rocker arm (5) and the second exhaust valve rocker arm (7) are driven by the first exhaust cam (2) and the second exhaust cam (4) to swing.

2. When hydraulic oil enters the hydraulic oil duct (220) through the bolt oil duct (447) and the hydraulic oil inlet hole (221), the hydraulic oil is output through the hydraulic oil outlet hole (222), enters the oil duct (16) and the first synchronous piston hole (21) and pushes the timing piston (10), the timing piston (10) pushes the first synchronous piston (11), and when the variable-cycle rocker arm (6) is not in contact with the variable-cycle cam (3), and the center lines of the first synchronous piston hole (21), the second synchronous piston hole (25) and the blocking piston hole (20) are coincident, the first synchronous piston (11) is pushed into the second synchronous piston hole (25) and pushes the second synchronous piston (14) to simultaneously enter the blocking piston hole (20) and push the blocking piston (18) and compress the reset spring (17), so far, the first exhaust valve rocker arm (5), the variable-cycle rocker arm (6) and the reset spring (17) are completed, The second exhaust valve rocker arm (7) is combined to rock together, and the first exhaust valve rocker arm (5), the variable cycle rocker arm (6) and the second exhaust valve rocker arm (7) can synchronously rock under the driving of the first exhaust cam (2) and the second exhaust cam (4) to complete the action of opening an intake valve in the original exhaust stroke of the engine and can synchronously rock under the driving of the variable cycle cam (3).