CN212716801U

CN212716801U - Engine braking device and engine

Info

Publication number: CN212716801U
Application number: CN202021255712.5U
Authority: CN
Inventors: 宋晓轶; 王飞; 徐得石; 李扬
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2021-03-16
Anticipated expiration: 2030-06-30

Abstract

The utility model relates to the field of engines, in particular to an engine braking device and an engine, wherein the engine braking device comprises a rocker arm, a first elastic part, a braking piston and a locking piston, and the rocker arm is provided with a first holding tank and a second holding tank; the first elastic piece is arranged in the first accommodating groove; the brake piston is arranged in the first accommodating groove in a sliding mode, a brake hole is formed in the brake piston, the brake piston is configured to abut against the valve, and the brake piston is provided with a first position enabling the valve to be closed and a second position enabling the valve to be fully opened; the locking piston is arranged in the second accommodating groove in a sliding mode, can be inserted into the braking hole under the driving of the power source to lock the braking piston at the second position, and can be withdrawn from the braking hole to release the braking piston. The utility model discloses can stretch into the braking hole of braking piston through the locking piston and can directly lock the position of braking piston, need not to set up the connecting rod, do not have the serious condition of connecting rod wearing and tearing, therefore can guarantee the braking precision.

Description

Engine braking device and engine

Technical Field

The utility model relates to the technical field of engines, especially, relate to an engine braking device and engine.

Background

In the related art, when the automobile is braked, the engine can be braked through friction braking, so that the engine is prevented from outputting power outwards. The engine braking is realized by a braking rocker arm, and the working principle of the engine braking rocker arm is that when the engine is close to a top dead center in a compression stroke, an exhaust valve is opened, and the work of the engine in compressing gas in a cylinder is released into an exhaust system. In the next power stroke, the exhaust valve is closed, the piston moves downwards to generate negative power similar to a vacuum pumping process, and auxiliary braking is realized.

The brake rocker arm in the related technology is provided with a drive piston on the rocker arm, the rocker arm is also provided with a guide groove, an upper connecting rod, a lower connecting rod and a working piston are installed in the guide groove, one end of the upper connecting rod is abutted to the groove wall of the guide groove, the other end of the upper connecting rod is hinged to the lower connecting rod, the lower connecting rod is abutted to the working piston, the working piston is slidably installed in the guide groove, the drive piston is driven by oil pressure and acts on the joint of the upper connecting rod and the lower connecting rod to enable the upper connecting rod and the lower connecting rod to integrally extend, and the lower connecting rod pushes the working piston to extend out of the guide groove and contact. However, in the related art, the brake rocker arm pushes the joint of the upper connecting rod and the lower connecting rod to move through the driving piston, so that the upper connecting rod and the lower connecting rod are stretched to brake, the joint of the two connecting rods bears a large pressure, the contact surface between the connecting rod and the brake piston is seriously abraded after long-time use, the brake precision is further reduced, and the brake reliability is deteriorated.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an engine arresting gear and engine to solve the connecting rod wearing and tearing that exist among the prior art serious, influence the technical problem of braking precision.

To achieve the purpose, the utility model adopts the following technical proposal:

an engine braking device comprising:

the rocker arm is provided with a first accommodating groove and a second accommodating groove communicated with the first accommodating groove;

the first elastic piece is arranged in the first accommodating groove;

a brake piston slidably disposed in the first accommodation groove, the brake piston having a brake hole formed therein, the brake piston being configured to abut against a valve, the brake piston having a first position at which the valve is closed and a second position at which the valve is fully opened, the first elastic member being configured to drive the brake piston from the first position to the second position;

and the locking piston is arranged in the second accommodating groove in a sliding mode and can be inserted into the braking hole under the driving of a power source to lock the braking piston at the second position and withdrawn from the braking hole to release the braking piston.

As a preferable technical solution of the engine braking device, the braking piston includes a piston body and a sliding block, the sliding block is located between the first elastic member and the piston body, and the braking hole is opened on the sliding block.

As the preferable technical scheme of the engine braking device, a baffle plate is arranged at the notch of the first accommodating groove, a through hole is formed in the baffle plate, and the head end of the piston body can penetrate through the through hole to abut against the valve.

As a preferable technical scheme of the engine braking device, the power source comprises a hydraulic pump and a second elastic piece, an oil duct communicated with the second accommodating groove is formed in the rocker arm, the hydraulic pump is used for pumping hydraulic oil into the second accommodating groove through the oil duct to drive the locking piston to be inserted into the braking hole, and the second elastic piece is used for driving the locking piston to withdraw from the braking hole.

As a preferable technical solution of the engine braking device, a limiting member is provided in the second receiving groove, and the limiting member is configured to limit a stop position of the locking piston when the locking piston retreats from the first receiving groove.

As an optimal technical scheme of the engine braking device, the second accommodating groove comprises a piston guide hole and an oil cavity which are communicated with each other, the piston guide hole is communicated with the first accommodating groove, the oil cavity is communicated with the oil duct, the cross section of the locking piston is in a T shape, the locking piston can move along the piston guide hole, and the large head end of the locking piston can be limited in the oil cavity.

As a preferable technical solution of the engine braking device, one end of the second elastic member abuts against a large end of the lock piston, and the other end of the second elastic member abuts against an inner wall of the oil chamber on a side close to the piston guide hole.

As engine arresting gear's preferred technical scheme, engine arresting gear still includes adjusting screw and nut, and the one end that first holding tank was kept away from to the second holding tank is provided with uncovered, and adjusting screw spiro union just will uncovered the closure in the inner wall of second holding tank, and the nut spiro union is in adjusting screw with fixed adjusting screw.

As a preferable technical solution of the engine braking device, the first elastic member and the second elastic member are both compression springs.

An engine comprising the engine braking device described in any one of the above aspects.

The utility model has the advantages that:

the utility model provides an engine braking device can stretch into the braking hole of braking piston through the locking piston and can directly lock the position of braking piston, need not to set up the connecting rod, does not have the serious condition of connecting rod wearing and tearing, therefore can guarantee the braking precision.

Drawings

Fig. 1 is a schematic structural diagram of an engine braking device provided by the present invention in a non-braking state;

fig. 2 is a schematic structural diagram of the engine braking device provided by the present invention in a braking state;

fig. 3 is a schematic structural diagram of a rocker arm provided by the present invention;

fig. 4 is a schematic structural diagram of a sliding block in a brake piston according to the present invention.

In the figure:

10. a rocker arm; 11. a first accommodating groove; 12. a second accommodating groove; 121. a piston guide bore; 122. an oil chamber; 13. an oil passage; 21. a piston body; 22. a slider; 221. a brake hole; 30. a first elastic member; 40. a lock-up piston; 50. a second elastic member; 60. a baffle plate; 70. a limiting member; 80. adjusting the screw; 90. and a nut.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements related to the present invention are shown in the drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

As shown in fig. 1 to 4, the present invention provides an engine brake device, which includes a rocker arm 10, a first elastic member 30, a brake piston, and a lock piston 40. The rocker arm 10 is provided with a first accommodating groove 11 and a second accommodating groove 12 communicated with the first accommodating groove 11; the first elastic member 30 is disposed in the first accommodating groove 11, and the first elastic member 30 is preferably a compression spring; the brake piston is arranged in the first accommodating groove 11 in a sliding manner, a brake hole 221 is formed in the brake piston, the brake piston is configured to abut against the valve, the brake piston has a first position enabling the valve to be closed and a second position enabling the valve to be fully opened, the first elastic piece 30 is used for driving the brake piston to move from the first position to the second position, and the valve is used for driving the brake piston to move from the second position to the first position; the locking piston 40 is slidably disposed in the second receiving groove 12, and the locking piston 40 can be inserted into the braking hole 221 to lock the braking piston at the second position by being driven by the power source, and withdrawn from the braking hole 221 to release the braking piston. It can be understood that the rocker arm 10 swings back and forth during the engine power-applying process to open and close the valve frequently, when the rocker arm 10 drives the brake piston to move downwards, the air port of the valve tends to be opened gradually, and when the rocker arm drives the brake piston to move upwards, the air port of the valve tends to be closed gradually. When the brake piston is at the first position, the brake piston moves to the top, the air port of the air valve is closed at the moment, and when the brake piston moves to the second position, the opening degree of the air valve reaches the maximum.

The utility model provides an engine braking device can stretch into the braking hole 221 of braking piston through locking piston 40 and can directly lock the position of braking piston, need not to set up the connecting rod, does not have the serious condition of connecting rod wearing and tearing, therefore can guarantee the braking precision.

The brake piston includes a piston body 21 and a slide block 22, the slide block 22 is located between the first elastic member 30 and the piston body 21, and the brake hole 221 is opened in the slide block 22. Through setting up sliding block 22, can avoid trompil on piston body 21, ensure piston body 21's intensity, and can directly adopt current piston body 21, reduction in production cost.

Notch department of first holding tank 11 is provided with baffle 60, has seted up on the baffle 60 and has passed the hole, and the head end of piston body 21 can pass this and pass hole and valve butt. Through setting up baffle 60, can be with braking piston spacing in first holding tank 11. Specifically, the piston body 21 includes a first cylinder and a second cylinder, the diameter of the second cylinder is smaller than that of the first cylinder, the second cylinder is connected to an end of the first cylinder away from the slide block 22, the first cylinder and the second cylinder are coaxially arranged, the diameter of the through hole is greater than or equal to that of the second cylinder and smaller than that of the first cylinder, and the second cylinder can pass through the through hole.

The power source comprises a hydraulic pump and a second elastic part 50, an oil channel 13 communicated with the second accommodating groove 12 is formed in the rocker arm 10, the hydraulic pump is used for pumping hydraulic oil into the second accommodating groove 12 through the oil channel 13 so as to drive the locking piston 40 to be inserted into the braking hole 221, the second elastic part 50 is used for driving the locking piston 40 to exit from the braking hole 221, and the second elastic part 50 is preferably a compression spring. Preferably, a limiting member 70 is disposed in the second receiving groove 12, and the limiting member 70 is used for limiting the stop position of the locking piston 40 when the locking piston exits from the first receiving groove 11.

In the present embodiment, the second receiving groove 12 includes a piston guide hole 121 and an oil chamber 122 that are communicated with each other, the piston guide hole 121 is communicated with the first receiving groove 11, the oil chamber 122 is communicated with the oil passage 13, the cross section of the lock piston 40 is T-shaped, the lock piston 40 can move along the piston guide hole 121, and the large end of the lock piston 40 can be limited in the oil chamber 122. One end of the second elastic member 50 abuts against the large head end of the lock piston 40, and the other end of the second elastic member 50 abuts against the inner wall of the oil chamber 122 on the side closer to the piston guide hole 121.

Engine arresting gear still includes adjusting screw 80 and nut, and the one end that first holding tank 11 was kept away from to second holding tank 12 is provided with uncovered, and adjusting screw 80 spiro union is in the inner wall of second holding tank 12 and will uncovered the closure, and the nut spiro union is in adjusting screw 80 with fixed adjusting screw 80. When the braking valve clearance is adjusted, firstly, the adjusting screw 80 is rotated, the locking piston 40 is inserted into the braking hole 221 of the braking piston under the action of the adjusting screw 80, and the braking piston is limited at a second position; then a feeler gauge is inserted under the brake piston, and an adjusting screw at the side of the rocker arm push rod is adjusted.

The utility model provides an engine braking device's working method as follows:

when the engine is not braking, referring to fig. 1, the hydraulic pump does not pump hydraulic oil into the oil chamber 122, the lock-up piston 40 is pushed without pressure, and the lock-up piston 40 is located in the second receiving groove 12 under the action of the second elastic member 50. The brake piston is capable of reciprocating between a first position and a second position under the influence of the valve and the first resilient member 30.

When the engine is braked, referring to fig. 2, the hydraulic pump pumps hydraulic oil into the oil chamber 122, the locking piston 40 overcomes the elastic force of the second elastic member 50 under the action of the oil pressure, moves along the piston guide hole 121 of the second accommodating groove 12, and when the braking piston moves from the first position to the second position, the locking piston 40 is inserted into the braking hole 221 of the braking piston, so that the braking piston is limited at the second position, and the valve is opened, thereby realizing braking.

The utility model also provides an engine, including above-mentioned engine arresting gear, this engine is braked the brake piston locking in the second position through locking piston 40, can effectively avoid wearing and tearing, guarantees the engine braking precision.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An engine braking apparatus characterized by comprising:

the rocker arm (10) is provided with a first accommodating groove (11) and a second accommodating groove (12) communicated with the first accommodating groove (11);

the first elastic piece (30) is arranged in the first accommodating groove (11);

a brake piston which is arranged in the first accommodating groove (11) in a sliding mode, a brake hole (221) is formed in the brake piston, the brake piston is configured to abut against a valve, the brake piston has a first position enabling the valve to be closed and a second position enabling the valve to be fully opened, and the first elastic piece (30) is used for driving the brake piston to move from the first position to the second position;

a locking piston (40) slidably disposed in the second receiving groove (12), the locking piston (40) being capable of being inserted into the braking hole (221) to lock the braking piston at the second position under the driving of a power source, and being withdrawn from the braking hole (221) to release the braking piston.

2. The engine braking device according to claim 1, characterized in that the braking piston comprises a piston body (21) and a sliding block (22), the sliding block (22) being located between the first elastic member (30) and the piston body (21), the braking hole (221) opening on the sliding block (22).

3. The engine braking device according to claim 2, characterized in that a baffle plate (60) is arranged at the notch of the first accommodating groove (11), a through hole is formed in the baffle plate (60), and the head end of the piston body (21) can pass through the through hole to abut against the valve.

4. The engine brake device according to claim 1, wherein the power source includes a hydraulic pump and a second elastic member (50), the rocker arm (10) is provided with an oil passage (13) communicated with the second receiving groove (12), the hydraulic pump is used for pumping hydraulic oil into the second receiving groove (12) through the oil passage (13) to drive the locking piston (40) to be inserted into the brake hole (221), and the second elastic member (50) is used for driving the locking piston (40) to be withdrawn from the brake hole (221).

5. The engine braking apparatus according to claim 1, characterized in that a stopper (70) is provided in the second receiving groove (12), the stopper (70) being configured to restrict a stop position of the lock piston (40) when exiting the first receiving groove (11).

6. The engine braking device according to claim 4, wherein the second receiving groove (12) includes a piston guide hole (121) and an oil chamber (122) which are communicated with each other, the piston guide hole (121) is communicated with the first receiving groove (11), the oil chamber (122) is communicated with the oil passage (13), the cross section of the locking piston (40) is T-shaped, the locking piston (40) can move along the piston guide hole (121), and the large end of the locking piston (40) can be limited in the oil chamber (122).

7. The engine braking device according to claim 6, characterized in that one end of the second elastic member (50) abuts against a large end of the lock piston (40), and the other end of the second elastic member (50) abuts against an inner wall of the oil chamber (122) on a side close to the piston guide hole (121).

8. The engine braking device according to claim 1, characterized in that the engine braking device further comprises an adjusting screw (80) and a nut, an opening is arranged at one end of the second accommodating groove (12) far away from the first accommodating groove (11), the adjusting screw (80) is screwed on the inner wall of the second accommodating groove (12) and closes the opening, and the nut is screwed on the adjusting screw (80) to fix the adjusting screw (80).

9. The engine braking apparatus according to claim 4, characterized in that the first elastic member (30) and the second elastic member (50) are both compression springs.

10. An engine comprising the engine brake device according to any one of claims 1 to 9.