Engine rocker arm braking device

Abstract

The utility model relates to the technical field of engine rocker arm braking, and discloses an engine rocker arm braking device which comprises a braking assembly installed in a rocker arm body, a containing groove and a braking groove are formed in the rocker arm body, the containing groove and the braking groove are communicated in a crossed mode, and a movable assembly is connected in the containing groove. One end of the movable assembly penetrates through the containing groove to abut against an engine valve, the brake assembly is located in the brake groove, one end of the brake assembly is connected with the movable assembly, and an oil groove is formed in the end, away from the containing groove, of the brake groove and connected with the brake assembly. According to the engine rocker arm braking device, the engine valve drives the braking assembly to move into the containing groove, so that braking is limited by the braking assembly, braking of the engine rocker arm is achieved, meanwhile, hydraulic thrust is provided through the oil groove, and the problem that braking cannot be relieved due to the fact that resistance at the joint of the braking assembly and the movable assembly is too large is solved; the braking assembly is stably driven, and then rocker arm braking is relieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of engine rocker arm brake, concretely to an engine rocker arm brake device. BACKGROUND

[0002] The engine rocker arm brake device is a special brake system specially designed for the valve control mechanism of an internal combustion engine. Its main function is to lock the rocker arm when the engine is stopped or encounters a specific working condition to avoid unnecessary movement caused by external factors (such as valve spring failure, camshaft damage, etc.), thereby protecting the internal structure of the engine from damage.

[0003] In related technology, the structure of the brake rocker arm is quite ingenious: the drive piston is installed on the rocker arm, and the rocker arm is also equipped with a guide groove. The guide groove is internally provided with an upper link, a lower link, and a working piston. One end of the upper link is in close contact with the groove wall of the guide groove, and the other end is connected to the lower link by a hinged manner. The lower link is in contact with the working piston, and the working piston can freely slide in the guide groove. When braking is needed, the drive piston is driven by oil pressure and acts on the connecting part of the upper link and the lower link, causing the upper link and the lower link to stretch as a whole. This movement in turn pushes the lower link, causing it to drive the working piston to extend from the guide groove and finally come into contact with the valve, thereby opening the valve.

[0004] The patent with the current publication number CN212716801U discloses an engine brake device and an engine, which comprises a rocker arm, a first elastic member, a brake piston, and a locking piston. The rocker arm is provided with a first accommodating groove and a second accommodating groove. The first elastic member is arranged in the first accommodating groove. The brake piston is slidably arranged in the first accommodating groove, and a brake hole is formed in the brake piston. The brake piston is configured to abut against the valve, and has a first position to close the valve and a second position to fully open the valve. The locking piston is slidably arranged in the second accommodating groove. The locking piston can be driven by a power source to insert into the brake hole of the brake piston to lock the brake piston at the second position, and to withdraw from the brake hole to release the brake piston. The position of the brake piston can be directly locked by the locking piston extending into the brake hole, without the need for a connecting rod, and the connecting rod is not subject to severe wear, thereby ensuring brake precision.

[0005] However, the engine rocker arm brake in the above technology still has the following problems: Although the direct locking method by setting the locking piston avoids the problem of connecting rod wear, when the locking piston is inserted into the brake piston and needs to be unlocked, the friction between the locking piston and the brake piston may cause the elastic member to fail to smoothly withdraw the locking piston from the brake hole, resulting in the engine failing to start smoothly. UTILITY MODEL CONTENTS

[0006] The engine rocker arm brake device improves the stability of the brake and unbrake switching actions of the rocker arm.

[0007] To achieve the above object, the utility model provides the following technical scheme: a kind of engine rocker arm brake device, including the brake assembly of being installed in rocker arm body, rocker arm body is equipped with containing groove and brake groove, containing groove and brake groove cross communication, containing groove is connected with movable assembly, one end of movable assembly passes through containing groove and is located with engine valve, brake groove is located in brake assembly, one end of brake assembly is connected with movable assembly, brake groove is equipped with oil groove in the end away from containing groove, brake assembly is connected with oil groove, movable assembly includes piston rod and spring, one end of spring is fixedly connected with one end of containing groove, the other end is fixedly connected with piston rod, piston rod is slidably connected with containing groove, the other end of piston rod passes through containing groove and is located with engine valve, the side wall of piston rod near spring is through and is equipped with brake hole, brake hole is connected with brake assembly, brake assembly includes locking piston and brake ring, locking piston is slidably connected with brake groove, one end of locking piston is slidably connected with brake hole, brake ring is set to the other end of locking piston, and is fixedly connected with locking piston, brake ring is slidably connected with oil groove.

[0008] Further, the other end of piston rod away from spring is set with damping ring, the inner wall of one end of containing groove away from spring is equipped with damping groove, damping ring is located in damping groove, damping groove is injected with damping liquid.

[0009] Further, the other end of containing groove away from spring is equipped with brake oil channel, the other end of containing groove away from spring is equipped with brake oil channel.

[0010] Further, the other end of containing groove away from spring is equipped with brake oil channel, the other end of containing groove away from spring is equipped with brake oil channel.

[0011] Further, the other end of containing groove away from spring is equipped with brake oil channel, the other end of containing groove away from spring is equipped with brake oil channel.

[0012] Compared with prior art, the utility model has the following beneficial effects:

[0013] The engine rocker arm brake device moves into containing groove by engine valve and is braked and limited by brake assembly, realizes the brake of engine rocker arm, provides hydraulic thrust through oil groove, avoids the problem that brake assembly and movable assembly connection place resistance is too large and causes brake to be unable to be released, ensures that brake assembly is driven stably, and then releases rocker arm brake. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is overall appearance connection structure schematic view of the utility model;

[0015] Figure 2 Another form of connection structure of the utility model is shown.

[0016] In the figure: 1, rocker arm body; 2, piston rod; 3, spring; 4, damping ring; 5, locking piston; 6, brake ring; 101, containing groove; 102, brake groove; 103, damping groove; 104, oil groove; 105, oil return channel; 106, oil inlet channel; 107, liquid inlet hole; 201, brake hole. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0018] Please refer to Figure 1 and Figure 2 , an engine rocker arm brake device, comprising a brake assembly installed in a rocker arm body 1, the rocker arm body 1 is provided with a containing groove 101 and a brake groove 102, the containing groove 101 and the brake groove 102 are cross-communicated, the containing groove 101 is connected with a movable assembly, one end of the movable assembly passes through the containing groove 101 and abuts against the engine valve, the brake assembly is located in the brake groove 102, one end of the brake assembly is connected with the movable assembly, the end of the brake groove 102 away from the containing groove 101 is provided with an oil groove 104, the brake assembly is connected with the oil groove 104, the movable assembly comprises a piston rod 2 and a spring 3, one end of the spring 3 is fixedly connected with one end of the containing groove 101, the other end is fixedly connected with the piston rod 2, the piston rod 2 is slidably connected with the containing groove 101, the other end of the piston rod 2 passes through the containing groove 101 and abuts against the engine valve, a brake hole 201 is formed through the side wall of the end of the piston rod 2 close to the spring 3, the brake hole 201 is connected with the brake assembly, the brake assembly comprises a locking piston 5 and a brake ring 6, the locking piston 5 is slidably connected with the brake groove 102, one end of the locking piston 5 is slidably connected with the brake hole 201, the brake ring 6 is sleeved with the other end of the locking piston 5 and is fixedly connected with the locking piston 5, the brake ring 6 is slidably connected with the oil groove 104.

[0019] As Figure 1 and Figure 2 shown, the engine rocker arm brake device in the utility model is similar in structure to the existing engine rocker arm brake device, such as the engine brake device and the engine disclosed in the patent with the announcement number CN212716801U, the main improvement point of the utility model is to improve the stability of the engine rocker arm braking process, such as Figure 1 and Figure 2As shown, the engine rocker arm brake device in the utility model is used, when the engine valve pushes the movable assembly into the containing groove 101, the brake assembly is pushed by the high oil pressure in the oil groove 104, and the movable assembly is braked, when the brake needs to be cancelled, the brake assembly is separated from the movable assembly by providing reverse oil pressure in the oil groove 104, so that the rocker arm brake is contacted quickly and stably, even if there is a certain friction resistance between the brake assembly and the movable assembly, the brake can be smoothly released under the pushing of high oil pressure, when the brake is released, the spring 3 pushes the piston rod 2 outward, and then the end of the piston rod 2 is pressed against the engine valve, so that the engine valve is opened after the brake is released; the oil pressure provided by the oil groove 104 pushes the brake ring 6, and then the locking piston 5 is inserted into the brake hole 201 to form a brake effect, or is removed from the brake hole 201 to release the brake.

[0020] As shown in Figure 1 and Figure 2 , the piston rod 2 is sleeved with the damping ring 4 away from the spring 3, the inner wall of the containing groove 101 is provided with the damping groove 103 away from the spring 3, the damping ring 4 is located in the damping groove 103, and damping liquid is injected into the damping groove 103. By injecting damping liquid into the damping groove 103, the moving resistance of the damping liquid to the damping ring 4 can slow down the moving speed of the spring 3 pushing the piston rod 2 to move outward to open the valve, so that the engine is prevented from starting excessively in an instant due to the too fast opening speed of the valve, and the service life of the engine is improved.

[0021] As shown in Figure 1 and Figure 2 , the oil groove 104 is provided with the oil discharging channel 105 close to the containing groove 101, and the oil groove 104 is provided with the oil discharging channel 106 away from the containing groove 101. The oil pressure provided by the oil groove 104 can inject oil into the oil groove 104 through the oil discharging channel 105, so as to provide the pushing force of the locking piston 5 out of the brake hole 201, so as to release the brake, and inject oil into the oil groove 104 through the oil discharging channel 106, so as to provide the pushing force of the locking piston 5 into the brake hole 201, so as to form the brake operation, wherein it needs to be particularly pointed out that the oil discharging channel 105 and the oil discharging channel 106 are two oil channels matched with each other, one oil channel injects oil, and the other oil channel discharges oil.

[0022] As shown in Figure 1 and Figure 2 , the damping groove 103 is provided with the liquid inlet hole 107 on one side, and the other end of the liquid inlet hole 107 is communicated with the oil groove 104. The damping groove 103 is communicated with the oil groove 104 through the liquid inlet hole 107, and the damping effect is formed by oil pressure.

[0023] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application.

Claims

1. An engine rocker arm brake device, comprising a brake assembly installed in a rocker arm body (1), the rocker arm body (1) is provided with a containing groove (101) and a brake groove (102), characterized in that: The accommodating groove (101) is in cross communication with the brake groove (102), the movable assembly is connected in the accommodating groove (101), one end of the movable assembly passes through the accommodating groove (101) and abuts against the engine valve, the brake assembly is located in the brake groove (102), one end of the brake assembly is connected with the movable assembly, the brake groove (102) is provided with the oil groove (104) at the end away from the accommodating groove (101), the brake assembly is connected with the oil groove (104), the movable assembly comprises a piston rod (2) and a spring (3), one end of the spring (3) is fixedly connected with one end of the accommodating groove (101), the other end is fixedly connected with the piston rod (2), the piston rod (2) is in sliding connection with the accommodating groove (101), the other end of the piston rod (2) passes through the accommodating groove (101) and abuts against the engine valve, the side wall of the end of the piston rod (2) close to the spring (3) is provided with the brake hole (201) in penetration, the brake hole (201) is connected with the brake assembly, the brake assembly comprises a locking piston (5) and a brake ring (6), the locking piston (5) is in sliding connection with the brake groove (102), one end of the locking piston (5) is in sliding connection with the brake hole (201), the brake ring (6) is sleeved on the other end of the locking piston (5) and is fixedly connected with the locking piston (5), and the brake ring (6) is in sliding connection with the oil groove (104).

2. An engine rocker arm brake device according to claim 1, characterized in that: The end of the piston rod (2) away from the spring (3) is sleeved with a damping ring (4), the inner wall of the end of the accommodating groove (101) away from the spring (3) is provided with a damping groove (103), the damping ring (4) is located in the damping groove (103), and damping liquid is injected into the damping groove (103).

3. An engine rocker arm brake as defined in claim 1, wherein: The end of the oil groove (104) close to the accommodating groove (101) is provided with a brake oil channel (105), and the end of the oil groove (104) away from the accommodating groove (101) is provided with a brake oil channel (106).

4. An engine rocker arm brake device as defined in claim 2, wherein: The damping groove (103) is provided with a liquid inlet hole (107) on one side, and the other end of the liquid inlet hole (107) is in communication with the oil groove (104).

5. An engine rocker arm brake as defined in claim 2, wherein: The damping groove (103) is provided with a liquid inlet hole (107) on one side, and the other end of the liquid inlet hole (107) is in communication with the oil groove (104).

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