CN116816470B - A radially stabilizing support roller tappet - Google Patents
A radially stabilizing support roller tappetInfo
- Publication number
- CN116816470B CN116816470B CN202310879419.8A CN202310879419A CN116816470B CN 116816470 B CN116816470 B CN 116816470B CN 202310879419 A CN202310879419 A CN 202310879419A CN 116816470 B CN116816470 B CN 116816470B
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- CN
- China
- Prior art keywords
- radial
- rod
- shield
- wall
- groove
- 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.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/14—Tappets; Push rods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
- F02M59/102—Mechanical drive, e.g. tappets or cams
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
本发明涉及一种径向稳定支撑滚柱挺杆，包括有壳体，壳体的内壁固定有桥接座，壳体的内壁镶嵌安装有销轴，销轴的表面连接有与销轴偏心布置的凸轮滚柱，桥接座的内部贯穿滑动连接有转接杆，桥接座的顶部安装有环绕套接于转接杆外侧的径向护罩，且径向护罩的底部延伸至桥接座的内部，径向护罩的内部设有气槽，气槽的内部滑动连接有活动护罩，活动护罩的内侧表面安装有连杆，连杆的尾端与转接杆的表面固定连接，利用活动护罩与连杆以及转接杆之间的连接关系，使得转接杆在上升状态时活动护罩得以同步提升，进而使得上升状态的转接杆得到的有效径向支撑增加，以此保证本滚珠挺杆具有稳定的径向支撑。
This invention relates to a radially stabilizing support roller tappet, comprising a housing, a bridging seat fixed to the inner wall of the housing, a pin embedded in the inner wall of the housing, a cam roller eccentrically arranged on the surface of the pin, a transition rod slidably connected through the bridging seat, a radial guard mounted on the top of the bridging seat and surrounding the outside of the transition rod, the bottom of the radial guard extending into the interior of the bridging seat, an air groove inside the radial guard, a movable guard slidably connected inside the air groove, a connecting rod mounted on the inner surface of the movable guard, the tail end of the connecting rod being fixedly connected to the surface of the transition rod, and utilizing the connection relationship between the movable guard, the connecting rod, and the transition rod, the movable guard is synchronously raised when the transition rod is in the rising state, thereby increasing the effective radial support of the rising transition rod, thus ensuring that the ball tappet has stable radial support.
Description
Technical Field
The invention relates to a radial stable supporting roller tappet, in particular to a radial stable supporting roller tappet applied to the field of roller lifters.
Background
The tappet is a main component of a valve mechanism, and is a mechanism for transmitting force on an eccentric wheel on a cam shaft to a valve by utilizing engine oil pressure, wherein the roller tappet is used as one of the lifters, has wider application, but the complexity of the structure is required to be paid attention to in the use process so as to reduce the dead weight of the roller lifters.
In order to solve the problem of complex structure, a certain roller tappet in the market adopts a design with simplified structure and light weight, and has a certain market occupation ratio.
The chinese patent CN202110243547.4 describes a roller tappet for a high-pressure fuel pump, which has a housing, in whose annular end face on the drive side a cam roller is arranged, a bridge projecting on the rear side of the cam roller from the inner face of the housing, a pin for contacting the pump piston projecting from the outer face of the bridge facing away from the cam roller, the bridge being connected in one piece with the housing, and the pin being a separate adapter piece for the pump piston projecting beyond the annular end face on the driven side of the housing, the outer end face of the adapter piece forming a direct abutment for the pump piston, wherein the contact area between the inner end face of the adapter piece and the outer face of the bridge acts as a hinge mechanism, the ring projecting in one piece from the outer face of the bridge, the ring projecting from the outer face of the bridge with a gap surrounding the ring of the adapter piece on the inner end face of the adapter piece in order to limit tilting of the adapter piece relative to the housing.
The roller tappet adopts a simplified structure to realize the light weight of the tappet in the design, but the effective contact area with the bridging piece is constant when the switching piece moves up and down, so that the switching piece is effectively supported by the bridging piece in the radial direction when ascending, the radial displacement is easy to occur, and the effectiveness of the tappet is influenced.
Disclosure of Invention
Aiming at the prior art, the invention aims to solve the technical problem that the effective radial support area of the bridge piece and the adapter piece rod body is increased by the movable radial shield when the adapter piece ascends, so that the adapter piece in a lifting state can be stably and effectively supported in the moving process.
In order to solve the problems, the invention provides a radial stable supporting roller tappet which comprises a shell, wherein a bridge seat is fixed on the inner wall of the shell, a pin shaft is embedded and installed on the inner wall of the shell, the surface of the pin shaft is connected with cam rollers eccentrically arranged with the pin shaft, an adapter rod is connected in a penetrating and sliding manner in the bridge seat, a radial shield sleeved on the outer side of the adapter rod is installed on the top of the bridge seat in a surrounding manner, the bottom of the radial shield extends to the inner side of the bridge seat, an air groove is arranged in the radial shield, a movable shield is connected in the air groove in a sliding manner, a connecting rod is installed on the inner side surface of the movable shield, and the tail end of the connecting rod is fixedly connected with the surface of the adapter rod.
In the radial stable supporting roller tappet, the movable shield, the connecting rod and the switching rod are connected, so that the movable shield can be synchronously lifted when the switching rod is in a lifting state, and further the effective radial support obtained by the switching rod in the lifting state is increased, and the ball tappet is guaranteed to have stable radial support.
As a further improvement of the application, the bottom of the movable shield is connected with a piston ring, the bottom wall of the air groove is penetrated and provided with an impact air hole, the position, close to the bottom end, of the surface of the radial shield is penetrated and connected with an air inlet pipeline, the air inlet pipeline and the inside of the impact air hole are both provided with one-way valves, the tail end of the air inlet pipeline extends to the surface of the bridging seat, and the impact air hole penetrates and extends to the bottom of the bridging seat.
As a further improvement of the application, the inside of the bridge seat is provided with a through hole which penetrates through the bridge seat, and the through hole and the air inlet pipeline are arranged in a staggered way.
As a still further improvement of the application, the surface of the movable shield is provided with heat dissipation holes, and the movable shield is made of alloy materials.
As a further improvement of the application, the height of the movable shield is greater than the diameter of the cam roller, the height of the air groove is greater than the height of the movable shield, and the air inlet pipe is located below the piston ring.
As a further improvement of the application, an inward supporting groove is arranged in the movable shield, one end of the connecting rod is connected with a rack positioned in the supporting groove, and a gear rod meshed with the rack is arranged on the inner wall of the supporting groove.
As a further improvement supplement of the application, the inner wall of the supporting groove is connected with a sealing blocking plate in a sliding way, the sealing blocking plate and the inner wall of the supporting groove form a pressure cavity, and the inside of the pressure cavity is filled with gas.
In addition to the further improvement of the application, the gear rod is connected with the inner wall of the supporting groove through a bearing, the air pressure inside the pressure cavity is equal to the external air pressure of the shell in the meshed state of the gear rod and the rack in the initial state, and the rack is connected with the sealing plugging plate.
In summary, the beneficial effects of the application are as follows:
When the roller tappet is used, in the rising process of the switching rod, under the connecting action of the connecting rod, the movable shield rises synchronously, so that the effective radial supporting area of the switching rod is increased, the radial supporting action of the switching rod is further enhanced, the switching rod in the rising state can be stably supported in a radial stable manner, and the switching rod is prevented from being subjected to radial deflection in the moving process, so that the working accuracy of the roller tappet is prevented from being influenced;
Along with the lifting of the movable shield, the gas outside the bridging seat can enter the space below the piston ring in the gas groove through the gas inlet pipeline, and the sucked gas can be discharged through the impact gas hole when the piston ring descends, so that the surface of the cam roller in a rotating state is subjected to flushing treatment, and the radial offset possibly occurring in the follow-up process caused by the end offset of the switching rod is avoided;
When the wall thickness is reduced due to the fact that the bridging seat is in sliding lifting friction contact with the transfer rod for a long time, the transfer rod is radially offset once, the connecting rod can be pressed to the inside of the supporting groove to be close, at the moment, the sealing blocking plate slides inwards and is influenced by the air pressure, the sealing blocking plate is difficult to move continuously, further the transfer rod is prevented from being radially offset continuously, and the radial offset distance of the transfer rod is controlled within a controllable tolerance range.
Drawings
FIG. 1 is a schematic diagram showing the comparison of embodiment 1 of the present application with the prior art;
fig. 2 is a schematic view showing the overall structure of the appearance of embodiment 1 of the present application;
FIG. 3 is a schematic view showing the internal structure of embodiment 1 of the present application;
FIG. 4 is a schematic view of the mounting structure of the bridging seat and the movable shroud according to embodiment 1 of the present application;
FIG. 5 is a schematic diagram showing the lifting state of the adapter rod according to embodiment 1 of the present application;
FIG. 6 is a schematic view showing the inner structures of the movable shroud and the radial shroud according to embodiment 1 of the present application;
FIG. 7 is a schematic view showing the state of air inlet and air outlet of the inner air tank in the lifting state of the movable hood according to embodiment 1 of the present application;
FIG. 8 is a schematic diagram showing the internal cross-sectional structure of a bridge seat according to embodiment 1 of the present application;
fig. 9 is a cross-sectional view of embodiment 2 of the present application;
fig. 10 is an enlarged schematic view of embodiment 2 of the present application at a of fig. 9.
The reference numerals in the figures illustrate:
1. The device comprises a shell, a bridging seat, 21, a through hole, 3, a connecting rod, 4, a radial shield, 41, a movable shield, 42, an air groove, 43, a piston ring, 44, an impact air hole, 45, an air inlet pipeline, 411, a heat dissipation hole, 412, a connecting rod, 5, a pin shaft, 6, a cam roller, 7, a supporting groove, 71, a pressure cavity, 72, a sealing blocking plate, 73, a gear rod, 74 and a rack.
Detailed Description
2 Embodiments of the present application will be described in detail with reference to the accompanying drawings.
Embodiment 1:
Fig. 1-5 show a radial stable supporting roller tappet, which comprises a shell 1, wherein a bridging seat 2 is fixed on the inner wall of the shell 1, a pin shaft 5 is embedded and installed on the inner wall of the shell 1, a cam roller 6 eccentrically arranged with the pin shaft 5 is connected to the surface of the pin shaft 5, a transfer rod 3 is connected to the inside of the bridging seat 2 in a penetrating and sliding manner, a radial shield 4 sleeved on the outer side of the transfer rod 3 is installed on the top of the bridging seat 2 in a surrounding manner, the bottom of the radial shield 4 extends to the inside of the bridging seat 2, an air groove 42 is arranged in the radial shield 4, a movable shield 41 is connected to the inner side surface of the movable shield 41 in a sliding manner, a connecting rod 412 is installed on the inner side surface of the movable shield 41, and the tail end of the connecting rod 412 is fixedly connected with the surface of the transfer rod 3.
Specifically, when this roller tappet uses, be connected the tip and the pivoted part of round pin axle 5, can drive cam roller 6 and rotate, make eccentric arrangement's cam roller 6 be in the eccentric state, the transfer pole 3 that bottom surface and cam roller 6 surface contact follows cam roller 6's rotation and realize the up-and-down motion this moment, in transfer pole 3 rise the in-process, under the connecting action of connecting rod 412, drive movable guard 41 synchronous rising, make the effective radial support area that transfer pole 3 received increase, and then strengthen the radial supporting action of transfer pole 3, thereby make the transfer pole 3 of the state of rising can obtain stable radial steady supporting action, avoid transfer pole 3 to receive radial offset in the motion process, influence the accurate degree of roller tappet work.
Fig. 6-8 show that the bottom of the movable shield 41 is connected with a piston ring 43, the bottom wall of the air groove 42 is penetrated and provided with an impact air hole 44, the position, close to the bottom end, of the surface of the radial shield 4 is penetrated and connected with an air inlet pipeline 45, the inside of the air inlet pipeline 45 and the inside of the impact air hole 44 are both provided with one-way valves, the tail end of the air inlet pipeline 45 extends to the surface of the bridging seat 2, and the impact air hole 44 penetrates and extends to the bottom of the bridging seat 2.
Specifically, along with the lifting of the movable shield 41, the piston ring 43 moves synchronously in the air groove 42, so that the air outside the bridge seat 2 can enter the space below the piston ring 43 in the air groove 42 through the air inlet pipeline 45, and the sucked air can be discharged through the impact air holes 44 when the piston ring 43 descends, the surface of the cam roller 6 in a rotating state is subjected to flushing treatment, and the surface of the cam roller 6 is subjected to air cooling operation and cleaning treatment, so that the contact position between the bottom surface of the transfer rod 3 and the surface of the cam roller 6 is kept in a clean and unimpeded contact state, and the subsequent possible radial offset caused by end offset of the transfer rod 3 is avoided.
The inside of bridging seat 2 is equipped with the through-hole 21 that runs through, and through-hole 21 and admission line 45 dislocation arrangement.
Specifically, the through holes 21 are configured for medium passing, wherein the medium includes but is not limited to air, lubricant, etc., and are arranged in a staggered manner, so that the through holes 21 and the air inlet pipeline 45 are not interfered.
The surface of the movable shield 41 is provided with a heat radiation hole 411, and the movable shield 41 is made of alloy material.
Specifically, in the reciprocating motion of the adapter rod 3, the heat dissipation holes 411 on the surface of the movable shroud 41 can be used for assisting in heat dissipation, so that the heat deformation of the adapter rod 3 and the movable shroud 41 caused by frequent lifting is avoided, and in addition, the movable shroud 41 made of the alloy material has stronger rigidity, so that the radial supporting effect of the movable shroud 41 is ensured.
The height of the movable shroud 41 is greater than the diameter of the cam roller 6, the height of the air groove 42 is greater than the height of the movable shroud 41, and the air intake duct 45 is located below the piston ring 43.
Specifically, in order to ensure effective radial support of the movable shield 41 on the transfer rod 3, when the cam roller 6 moves to lift the transfer rod 3 to the top point, the effective activity value and the effective maintenance support height value of the movable shield 41 can both meet the radial support requirement in the state;
In addition, the installation position of the air inlet pipeline 45 is designed so that when the piston ring 43 is in a lifting state and then plays a role in sucking the space in the air groove 42 below, the air inlet pipeline 45 can smoothly convey and transfer the air outside the bridging seat 2 into the air groove 42, so as to wait for extrusion and discharge when the piston ring 43 falls.
Embodiment 2:
Fig. 9 to 10 show, wherein the same or corresponding parts as in embodiment 1 are denoted by the corresponding reference numerals as in embodiment 1, and only the points of distinction from embodiment 1 are described below for the sake of brevity. The embodiment 2 is different from the embodiment 1 in that the movable hood 41 is provided with an internally recessed support groove 7, a rack 74 provided in the support groove 7 is connected to one end of a link 412, and a gear rod 73 engaged with the rack 74 is mounted to the inner wall of the support groove 7.
The inner wall of the supporting groove 7 is slidably connected with a sealing closure plate 72, the sealing closure plate 72 and the inner wall of the supporting groove 7 form a pressure cavity 71, and the inside of the pressure cavity 71 is filled with gas.
The gear rod 73 is connected with the inner wall of the supporting groove 7 through a bearing, the air pressure inside the pressure cavity 71 in the initial state in which the gear rod 73 is meshed with the rack 74 is equal to the external air pressure of the housing 1, and the rack 74 is connected with the sealing closure plate 72.
Specifically, when the wall thickness is reduced due to the fact that the inner wall of the bridging seat 2 is not worn, under the meshing and locking actions of the gear rod 73 and the rack 74, the connecting rod 412 is in a constant supporting state, when the wall thickness is reduced due to the fact that the bridging seat 2 is in sliding lifting friction contact with the transfer rod 3 for a long time, once the transfer rod 3 is radially deflected, the connecting rod 412 is pressed to the inside of the supporting groove 7 to be close, at the moment, the sealing closure plate 72 slides inwards, and is difficult to move continuously under the influence of the air pressure, further the transfer rod 3 is prevented from being radially deflected, and the radial deflection distance of the transfer rod 3 is controlled within a controllable tolerance range;
Before the movement of the sealing closure plate 72 is started, since the pressure inside the pressure chamber 71 is equal to the external air pressure of the housing 1 in the initial state, the pressure inside the pressure chamber 71 is increased after the movement of the sealing closure plate 72, so that the resistance of the adapter rod 3 to further radial deflection is increased, thereby preventing the increase of the radial deflection.
The present application is not limited to the above-described embodiments, which are adopted in connection with the actual demands, and various changes made by the person skilled in the art without departing from the spirit of the present application are still within the scope of the present application.
Claims (7)
1. The radial stable supporting roller tappet comprises a shell (1), and is characterized in that a bridging seat (2) is fixed on the inner wall of the shell (1), a pin shaft (5) is embedded and installed on the inner wall of the shell (1), a cam roller (6) eccentrically arranged with the pin shaft (5) is connected to the surface of the pin shaft (5), a transfer rod (3) is connected to the inside of the bridging seat (2) in a penetrating and sliding manner, a radial shield (4) sleeved on the outer side of the transfer rod (3) in a surrounding manner is installed at the top of the bridging seat (2), the bottom of the radial shield (4) extends to the inside of the bridging seat (2), an air groove (42) is formed in the inside of the radial shield (4), a movable shield (41) is connected to the inside of the air groove (42) in a sliding manner, a connecting rod (412) is installed on the inner side surface of the movable shield (41), and the tail end of the connecting rod (412) is fixedly connected with the surface of the transfer rod (3).
The bottom of activity guard shield (41) is connected with piston ring (43), the diapire of air groove (42) runs through and is equipped with impact gas hole (44), the position that radial guard shield (4) surface is close to the bottom is run through and is connected with admission line (45), and the check valve is all installed to the inside of admission line (45) and impact gas hole (44), the tail end of admission line (45) extends to the surface of bridging seat (2), impact gas hole (44) run through and extend to the bottom of bridging seat (2).
2. A radially stable supporting roller tappet according to claim 1, characterized in that the bridge seat (2) is internally provided with a through hole (21) passing through, and the through hole (21) is arranged in a staggered manner with respect to the air inlet duct (45).
3. A radially stable supporting roller tappet as set forth in claim 1, characterized in that said movable shield (41) has heat dissipation holes (411) on its surface and the movable shield (41) is made of alloy material.
4. A radially stable supporting roller tappet according to claim 1, characterized in that the height of the movable shield (41) is greater than the diameter of the cam roller (6), the height of the air groove (42) is greater than the height of the movable shield (41), and the air intake duct (45) is located below the piston ring (43).
5. A radially stable supporting roller tappet according to claim 1, characterized in that an inward sinking supporting groove (7) is formed in the movable shield (41), one end of the connecting rod (412) is connected with a rack (74) located in the supporting groove (7), and a gear rod (73) meshed with the rack (74) is mounted on the inner wall of the supporting groove (7).
6. A radially stable supporting roller tappet according to claim 5, characterized in that the inner wall of the supporting groove (7) is slidingly connected with a sealing closure plate (72), the sealing closure plate (72) and the inner wall of the supporting groove (7) form a pressure cavity (71), and the inside of the pressure cavity (71) is filled with gas.
7. A radially stable supporting roller tappet according to claim 6, characterized in that the gear rod (73) is connected with the inner wall of the supporting groove (7) through a bearing, the pressure of the air pressure inside the pressure cavity (71) is equal to the external pressure of the housing (1) in the state that the gear rod (73) is meshed with the rack (74) in the initial state, and the rack (74) is connected with the sealing closure plate (72).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310879419.8A CN116816470B (en) | 2023-07-18 | 2023-07-18 | A radially stabilizing support roller tappet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310879419.8A CN116816470B (en) | 2023-07-18 | 2023-07-18 | A radially stabilizing support roller tappet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116816470A CN116816470A (en) | 2023-09-29 |
| CN116816470B true CN116816470B (en) | 2025-12-12 |
Family
ID=88122012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310879419.8A Active CN116816470B (en) | 2023-07-18 | 2023-07-18 | A radially stabilizing support roller tappet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116816470B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102686835A (en) * | 2009-11-30 | 2012-09-19 | 谢夫勒科技股份两合公司 | Roller tappet |
| CN113374609A (en) * | 2020-03-10 | 2021-09-10 | 舍弗勒技术股份两合公司 | Roller tappet for a high-pressure fuel pump |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009056305A1 (en) * | 2009-11-30 | 2011-06-01 | Schaeffler Technologies Gmbh & Co. Kg | Roller plunger, particularly for high-pressure fuel pump or for valve train of quality-or quantity controlled internal combustion engine, has housing which is projected under roller by bridge piece |
| DE102010022318B4 (en) * | 2010-06-01 | 2017-09-07 | Schaeffler Technologies AG & Co. KG | roller plunger |
| DE102011002589A1 (en) * | 2011-01-12 | 2012-07-12 | Schaeffler Technologies Gmbh & Co. Kg | Roller cam follower for stroke operation of rocker arm in overhead valve train, comprises down or lateral cam shaft of internal combustion engine, where roller cam follower is assembled from roller shaft |
-
2023
- 2023-07-18 CN CN202310879419.8A patent/CN116816470B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102686835A (en) * | 2009-11-30 | 2012-09-19 | 谢夫勒科技股份两合公司 | Roller tappet |
| CN113374609A (en) * | 2020-03-10 | 2021-09-10 | 舍弗勒技术股份两合公司 | Roller tappet for a high-pressure fuel pump |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116816470A (en) | 2023-09-29 |
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