CN110671166A - A hydraulic tappet for a valve train of a diesel engine - Google Patents

Abstract

The invention discloses a hydraulic tappet for a gas distribution mechanism of a diesel engine, comprising a rocker arm and a plunger, the plunger is press-fitted inside the rocker arm, and a rocker arm oil groove is provided on the upper surface of the rocker arm , the plunger is embedded and connected with an inner block, the outer side of the inner block is provided with a limit circlip installation groove, and a limit spring is filled between the plunger and the limit circlip installation groove, and the inner A spring seat is embedded and connected between the top end of the insert and the plunger, and a tappet spring is fixedly connected between the outer side of the bottom end of the spring seat and the plunger. The invention relates to the technical field of diesel engine valve trains. The hydraulic tappet used for the valve train of a diesel engine can realize the initial assembly state of zero clearance, and can automatically compensate for the gap caused by wear during operation, reduce the noise generated by the engine due to the valve train, and reduce engine assembly. Costs and maintenance costs for customers.

Description

A hydraulic tappet for a valve train of a diesel engine

technical field

The invention relates to the technical field of the diesel engine valve train field, in particular to a hydraulic tappet used for a diesel engine valve train.

Background technique

In the field of diesel engine valve trains, in the existing technology, the rocker arm of the valve train adopts adjusting bolt assemblies to adjust the valve clearance, which is a traditional mechanical method. In the initial state, a specific valve clearance needs to be manually reserved, which causes noise during engine operation, and after the adjustment bolt assembly is worn, the valve clearance needs to be readjusted.

The valve clearance adjustment in the initial state is a very important process for the engine. Whether it is manual adjustment or automatic assembly line automatic adjustment plus manual inspection, it will cause a lot of production costs. After the engine has been running for a period of time, if the engine is worn out and readjusted, it will not only cost the maintenance and repair costs, but also waste the operating time of the business and increase the operating cost of the customer.

SUMMARY OF THE INVENTION

Aiming at the deficiencies of the prior art, the present invention provides a hydraulic tappet for a valve train of a diesel engine, which solves the need to manually leave a specific valve clearance in the initial state in order to eliminate the influence of thermal expansion and contraction. This clearance brings about the problem of noise when the engine is running, and the valve clearance needs to be readjusted after the adjusting bolt assembly is worn.

In order to achieve the above purpose, the present invention is achieved through the following technical solutions: a hydraulic tappet for a valve train of a diesel engine, comprising a rocker arm and a plunger, the plunger being press-fitted inside the rocker arm, the The upper surface of the rocker arm is provided with a rocker arm oil groove, the interior of the plunger is embedded and connected with an insert block, and the outer side of the insert block is provided with a limit circlip installation groove, and the plunger and the limit circlip installation groove A limit spring is filled in between, a spring seat is embedded and connected between the top end of the inner block and the plunger, a tappet spring is fixedly connected between the outer side of the bottom end of the spring seat and the plunger, and the interior of the spring seat is filled with There is a one-way valve spring, the bottom end of the one-way valve spring and the inner block are filled with a one-way valve steel ball, the bottom end of the inner block is slidably connected with a ball tappet, and the ball tappet is slidably connected. The outer sleeve of the bottom end of the column is provided with a ball socket.

Preferably, a ball tappet oil groove is formed inside the ball tappet, a ball socket oil groove is formed inside the ball socket, and the ball socket oil groove is communicated with the ball tappet oil groove.

Preferably, a rocker arm lubricating oil inlet is provided on one side of the rocker arm, a lubricating oil groove is provided on the outer side of the plunger, a check valve oil inlet is provided on the outer side of the inner block, and the rocker arm is lubricated. The oil inlet, the lubricating oil groove and the oil inlet of the check valve are communicated.

Preferably, a tappet oil inlet is reserved between the top end of the insert block and the top end inside the plunger, and a high pressure cavity is reserved between the top end of the ball tappet and the interior of the insert block.

Preferably, an anti-separation groove is provided between the inner block and the plunger and close to the lower side of the limit snap spring installation groove, and a ball is provided between the bottom end of the inner block and the upper edge of the ball tappet head.

Preferably, the bottom end of the ball head tappet is a member of a hemispherical structure, and a ball head and ball socket lubricating oil inlet is opened between the edge of the inner top end of the ball head and the bottom end of the ball head tappet.

beneficial effect

The invention provides a hydraulic tappet for a valve train of a diesel engine. Compared with the prior art, the utility model has the following beneficial effects: the hydraulic tappet used for the valve train of the diesel engine is press-fitted inside the rocker arm through the plunger, the rocker arm oil groove is opened on the upper surface of the rocker arm, and the plunger There is an embedded block in the inner embedded connection, the outer side of the embedded block is provided with a limit circlip installation groove, the limit spring is filled between the plunger and the limit circlip installation groove, and the top of the embedded block is embedded with the plunger. There is a spring seat, a tappet spring is fixedly connected between the outer side of the bottom end of the spring seat and the plunger, and the inside of the spring seat is filled with a one-way valve spring, and a one-way valve spring is filled between the bottom end of the one-way valve spring and the inner block. Valve steel ball, the bottom end of the inner block is slidably connected with a ball head tappet, and the outer side of the bottom end of the ball head tappet is sleeved with a ball socket, the device can realize the initial assembly state of zero clearance, and can automatically compensate for wear during operation. The resulting gap reduces the noise generated by the engine due to the valve train, reduces the engine assembly cost and the customer's maintenance cost, and improves the customer's business operation efficiency.

Description of drawings

Fig. 1 is the assembly drawing of the present invention;

Fig. 2 is the structural decomposition schematic diagram of the present invention;

3 is a cross-sectional view of the present invention;

FIG. 4 is a schematic diagram of the assembly of the plunger and the one-way valve plunger in the present invention.

In the picture: 1. Plunger; 2. Tappet spring; 3. Spring seat; 4. One-way valve spring; 5. One-way valve steel ball; 6. Insert block; 7. Limit spring; 8. Ball head Tappet; 9. Ball socket; 10. Rocker arm; 11. Oil inlet of tappet; 12. High pressure chamber; 13. Oil inlet of check valve; 14. Lubricating oil inlet of rocker arm; 15. Lubricating oil groove; 16. 17. Anti-dropping groove; 18. Ball head; 19. Ball head tappet oil groove; 20. Ball head and ball socket lubricating oil inlet; 21, Ball socket oil groove; 22, Rocker arm oil groove.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

1-4, the present invention provides a technical solution: a hydraulic tappet for a valve train of a diesel engine, comprising a rocker arm 10 and a plunger 1, and the plunger 1 is press-fitted inside the rocker arm 10 , the upper surface of the rocker arm 10 is provided with a rocker arm oil groove 22, the interior of the plunger 1 is embedded and connected with an inlay block 6, the inlay block 6 is a hollow structure, and the top of the inlay block 6 passes through the check valve steel ball 5. Sealing, the outer side of the inner block 6 is provided with a limit spring installation groove 16, one side of the rocker arm 10 is provided with a rocker arm lubricating oil inlet 14, the outer side of the plunger 1 is provided with a lubricating oil groove 15, and the outer side of the inner block 6 is provided with There is a one-way valve oil inlet 13, the rocker arm lubricating oil inlet 14, the lubricating oil groove 15 and the one-way valve oil inlet 13 are connected, and a tappet inlet is reserved between the top of the inner block 6 and the top of the plunger 1. Oil port 11, a high pressure cavity 12 is reserved between the top end of the ball tappet 8 and the interior of the insert block 6, between the insert block 6 and the plunger 1 and close to the lower side of the limit snap spring installation groove 16 There is an anti-separation groove 17, and a ball head 18 is provided between the bottom end of the inner block 6 and the upper edge of the ball head tappet 8, and a limit spring 7 is filled between the plunger 1 and the limit spring installation groove 16, A spring seat 3 is embedded and connected between the top end of the inner block 6 and the plunger 1, a tappet spring 2 is fixedly connected between the outer side of the bottom end of the spring seat 3 and the plunger 1, and the interior of the spring seat 3 is filled with a one-way valve Spring 4, a one-way valve steel ball 5 is filled between the bottom end of the one-way valve spring 4 and the inner block 6, and the bottom end of the inner block 6 is slidably connected with a ball tappet 8, and the inside of the ball tappet 8 A ball head tappet oil groove 19 is provided, and a ball socket oil groove 21 is opened inside the ball socket 9. The ball socket oil groove 21 is communicated with the ball head tappet oil groove 19, and the bottom end of the ball head tappet 8 is a member of a hemispherical structure. , between the edge of the inner top end of the ball socket 9 and the bottom end of the ball head tappet 8 is provided with a ball head ball socket lubricating oil inlet 20, and the outer side of the bottom end of the ball head tappet 8 is sleeved with a ball socket 9, the device can achieve zero The initial assembly state of the gap, and can automatically compensate for the gap caused by wear during operation, reduce the noise generated by the engine due to the valve train, and reduce the engine assembly cost and the customer's maintenance cost, and improve the customer's business operation efficiency. This device It can realize the initial assembly state of zero clearance, and can automatically compensate for the clearance caused by wear during operation, reduce the noise generated by the engine due to the valve train, and reduce the engine assembly cost and the customer's maintenance cost, and improve the customer's business operation efficiency. .

During operation, the plunger 1 is press-fitted inside the rocker arm 10, and the lubricating oil enters the high pressure chamber 12 through the rocker arm lubricating oil inlet 14, the lubricating oil groove 15 and the one-way valve oil inlet 13, and then part of the lubricating oil flows along the ball. The head tappet oil groove 19 enters between the ball head tappet 8 and the ball socket 9, the excess lubricating oil is discharged from the ball socket oil groove 21, and another part of the lubricating oil inside the high pressure chamber 12 is embedded along the ball head tappet 8 and embedded. The inner wall of the block 6 slides, and after passing through the ball head 18, it slides down along the outer surface of the ball head tappet 8; after the lubricating oil enters the high-pressure chamber 12, the pressure inside the high-pressure chamber 12 rises, which can drive the one-way valve steel The ball 5 squeezes the one-way valve spring 4, so that the high pressure chamber 12 is communicated with the tappet oil inlet 11, and the lubricating oil slides from the tappet oil inlet 11 to the gap between the inner block 6 and the plunger 1, and the inner The insert 6 and the plunger 1 are lubricated. When the rocker arm 10 rotates downward under the action of the camshaft, it drives the hydraulic tappet to move downward, and pushes the valve bridge through the ball socket 9, and the generated reaction force pushes the ball tappet body. 8 tends to move upward, but the high pressure chamber 12 is sealed at this time, and the pressure in the chamber increases to overcome the thrust, so that the valve bridge pushes down the valve to complete the gas distribution function.

In the present invention, the plunger is press-fitted inside the rocker arm, the upper surface of the rocker arm is provided with a rocker arm oil groove, the interior of the plunger is embedded and connected with an insert block, and the outer side of the insert block is provided with a limit circlip installation groove , A limit spring is filled between the plunger and the limit snap spring installation groove, a spring seat is embedded and connected between the top end of the insert block and the plunger, and a tappet spring is fixedly connected between the outer side of the bottom end of the spring seat and the plunger. And the inside of the spring seat is filled with a one-way valve spring, a one-way valve steel ball is filled between the bottom end of the one-way valve spring and the inner block, and the bottom end of the inner block is slidably connected with a ball head tappet. A ball socket is sleeved on the outer side of the bottom end of the column. The device can realize the initial assembly state of zero clearance, and can automatically compensate for the clearance caused by wear during operation, reduce the noise generated by the engine due to the valve train, and reduce the engine assembly cost and cost. The customer's maintenance costs, and improve the customer's business operation efficiency.

It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (6)

1. A hydraulic tappet for a valve train of a diesel engine, comprising a rocker arm (10) and a plunger (1), the plunger (1) being press-fitted inside the rocker arm (10), the The upper surface of the rocker arm (10) is provided with a rocker arm oil groove (22), which is characterized in that an insert block (6) is embedded and connected to the inside of the plunger (1), and the outer side of the insert block (6) A limit spring installation groove (16) is opened, a limit spring (7) is filled between the plunger (1) and the limit spring installation groove (16), and the top end of the inner block (6) is connected to the column A spring seat (3) is embedded and connected between the plugs (1), and a tappet spring (2) is fixedly connected between the outer side of the bottom end of the spring seat (3) and the plunger (1). A check valve spring (4) is filled inside, and a check valve steel ball (5) is filled between the bottom end of the check valve spring (4) and the inner block (6), and the inner block (6) is filled with a check valve steel ball (5). A ball head tappet (8) is slidably connected to the bottom end of the ball head tappet (8), and a ball socket (9) is sleeved on the outer side of the bottom end of the ball head tappet (8). 2. A hydraulic tappet for a valve train of a diesel engine according to claim 1, characterized in that: a ball tappet oil groove (19) is provided inside the ball tappet (8), A ball socket oil groove (21) is opened inside the ball socket (9), and the ball socket oil groove (21) is communicated with the ball tappet oil groove (19). 3. A hydraulic tappet for a valve train of a diesel engine according to claim 1, wherein a rocker arm lubricating oil inlet (14) is provided on one side of the rocker arm (10), so The outer side of the plunger (1) is provided with a lubricating oil groove (15), the outer side of the inner block (6) is provided with a one-way valve oil inlet (13), the rocker arm lubricating oil inlet (14), lubricating oil inlet (14), lubricating oil inlet (14), lubricating oil The oil tank (15) is communicated with the oil inlet (13) of the check valve. 4. A hydraulic tappet for a valve train of a diesel engine according to claim 3, characterized in that: there is a predetermined gap between the top end of the inner block (6) and the top end inside the plunger (1). A tappet oil inlet (11) is left, and a high-pressure cavity (12) is reserved between the top end of the ball head tappet (8) and the interior of the insert block (6). 5. A hydraulic tappet for a valve train of a diesel engine according to claim 1, characterized in that: between the insert block (6) and the plunger (1) and close to the limit circlip The lower side of the installation groove (16) is provided with an anti-separation groove (17), and a ball head (18) is arranged between the bottom end of the inner block (6) and the upper side edge of the ball head tappet (8). 6. A hydraulic tappet for a valve train of a diesel engine according to claim 1, characterized in that: the bottom end of the ball tappet (8) is a member of a hemispherical structure, so A ball head and ball socket lubricating oil inlet (20) is opened between the edge of the inner top end of the ball socket (9) and the bottom end of the ball head tappet (8).

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