EGR lift valve bearing reset structure

Abstract

The utility model discloses an EGR lift valve bearing reset structure which comprises a gear, a cam structure, a guide block, a spring and a valve rod, and the cam structure is arranged at the center of the outer end face of the gear; a containing groove is formed in the outer end face of the gear, a cam structure is arranged in the containing groove, and the cam structure and the containing groove jointly form an arc-shaped sliding groove. The bearings are arranged in the arc-shaped sliding grooves in a rolling mode, and outer rings of the bearings are connected with the inner side walls of the arc-shaped sliding grooves in a rolling mode. The gear and the bearing are provided with a first rotating shaft and a second rotating shaft respectively, and the guide block is arranged below the bearing and connected with the bearing through the second rotating shaft. The top end of the valve rod is connected with the guide block, the valve rod is sleeved with the spring, and the top end of the spring abuts against the guide block. The technical effects are achieved as follows: in the opening and closing process of the valve, under the action of the cam structure, the outer ring of the bearing is always subjected to rolling friction, the friction force and the friction loss are small, the closing force is obviously improved, and meanwhile, the bearing and the cam structure are not easy to wear, and the service life is longer.

Description

Technical Field

[0001] The utility model relates to the technical field of EGR lift valves, in particular to an EGR lift valve bearing reset structure. Background Art

[0002] The EGR poppet valve directs a portion of the engine's exhaust gas into the cylinder and automatically adjusts the amount of exhaust gas recirculated based on the engine's actual operating conditions and operational changes. As the engine continues to operate, the EGR poppet valve must frequently open and close to meet engine demands. To ensure the EGR poppet valve's rapid response and lifespan, the transmission efficiency and reliability of the transmission structure play a key role.

[0003] The EGR poppet valve typically uses a cam mechanism to convert the motor's rotary motion into linear motion for valve opening and closing. The cam is integrated into a large gear that mates with the motor gear, and its follower is the guide block assembly. The cam structure is divided into two parts: the center wheel is responsible for pressing down to open the valve, and the outer wheel is responsible for pulling back to close the valve. The cooperation between the cam center wheel and the guide block assembly drives the valve stem to open the EGR poppet valve. Then, the motor rotates, and the guide block assembly resets under the action of the spring force and the outer wheel, and the EGR poppet valve closes. Among them, the coordinated movement between the cam and the guide block assembly is the key link in force transmission. In previous designs, the two-part cam structure had a height difference design. The center wheel and the outer wheel were respectively coordinated with the bearing and the bearing shaft for transmission. The bearing was pressed onto the top of the guide block assembly through the bearing shaft, and the bearing shaft extended out of the bearing end face. The center wheel and the bearing were coordinated for transmission, and the outer wheel and the bearing shaft were coordinated for transmission. Because the bearing shaft is fixed relative to the guide block, there is sliding friction between the outer edge wheel and the bearing shaft when the outer edge wheel pulls the bearing shaft back, resulting in large friction loss, small closing force, relatively prolonged valve closing time, and the cam surface is prone to wear and deformation, which has an adverse effect on product life. Utility Model Content

[0004] To this end, the utility model provides an EGR lift valve bearing reset structure to solve the above-mentioned problems in the prior art.

[0005] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0006] According to a first aspect of the present utility model, an EGR poppet valve bearing reset structure includes a gear, a cam structure, a guide block, a spring and a valve stem, wherein the cam structure is arranged at the center of the outer end surface of the gear;

[0007] An accommodating groove is provided on the outer end surface of the gear, the cam structure is provided in the accommodating groove, and the cam structure and the accommodating groove together form an arc-shaped sliding groove;

[0008] The bearing is rollingly arranged in the arc-shaped chute, and the outer ring of the bearing is rollingly connected to the inner side wall of the arc-shaped chute;

[0009] The gear and the bearing are respectively provided with a first rotating shaft and a second rotating shaft, the gear is limitedly connected to the valve body via the first rotating shaft, the guide block is provided below the bearing, and the guide block is connected to the bearing via the second rotating shaft;

[0010] The valve stem is vertically arranged, the top end of the valve stem is connected to the guide block, the spring is sleeved on the outside of the valve stem, and the top end of the spring abuts against the guide block.

[0011] Furthermore, the cam structure is coaxial with the gear.

[0012] Furthermore, the gear and the cam structure are an integrated structure.

[0013] Furthermore, a connecting ear is provided on the top of the guide block, the connecting ear is parallel to the outer end surface of the gear, and the guide block is connected to the second rotating shaft through the connecting ear.

[0014] Furthermore, it also includes a magnet, which is arranged on the connecting ear.

[0015] Furthermore, the connecting ear is provided with a mounting groove, and the magnet is arranged in the mounting groove.

[0016] Furthermore, the connecting ear and the guide block are an integral structure.

[0017] Furthermore, the bearing is a ball bearing.

[0018] The utility model has the following advantages: during use, when the valve is opened and closed, the outer ring of the bearing is always subjected to rolling friction under the action of the cam structure, the friction force and friction loss are small, and the closing force is significantly improved. At the same time, the bearing and the cam structure are not easy to wear and have a longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely illustrative, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0020] The structures, proportions, sizes, etc. illustrated in this specification are intended solely to complement the contents disclosed herein and to facilitate understanding and reading by persons skilled in the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in size, provided they do not affect the efficacy and objectives of the present invention, shall remain within the scope of the technical contents disclosed herein.

[0021] Figure 1 This is a front view of an EGR lift valve bearing reset structure provided in some embodiments of the present invention.

[0022] Figure 2 A side view of an EGR poppet valve bearing reset structure provided in some embodiments of the present invention.

[0023] Figure 3 An axonometric view of an EGR lift valve bearing reset structure provided in some embodiments of the present invention.

[0024] Figure 4 This is a structural schematic diagram of an EGR lift valve bearing reset structure provided by some embodiments of the present invention with the guide block removed.

[0025] In the figure: 1. gear, 2. first rotating shaft, 3. bearing, 4. second rotating shaft, 5. magnet, 6. guide block, 7. spring, 8. valve stem, 9. cam structure, 10. receiving groove. DETAILED DESCRIPTION

[0026] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can readily understand the other advantages and benefits of the present invention from the contents disclosed in this specification. Obviously, the embodiments described are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0027] Example 1

[0028] like Figures 1 to 4 As shown, an EGR poppet valve bearing reset structure in an embodiment of the first aspect of the present invention includes a gear 1, a cam structure 9, a guide block 6, a spring 7 and a valve stem 8. The cam structure 9 is arranged at the center of the outer end surface of the gear 1, the cam structure 9 is coaxial with the gear 1, and the cam structure 9 and the gear 1 are an integral structure;

[0029] The gear 1 is manufactured by injection molding. A receiving groove 10 is provided on the outer end surface of the gear 1. A cam structure 9 is provided in the receiving groove 10. The cam structure 9 and the receiving groove 10 together form an arc-shaped slide groove.

[0030] The bearing 3 is a ball bearing 3, and the bearing 3 may also be other types of bearings, such as a needle bearing. The bearing 3 is rollingly arranged in the arc-shaped chute, and the outer ring of the bearing 3 is rollingly connected to the inner wall of the arc-shaped chute.

[0031] The gear 1 and the bearing 3 are respectively provided with a first rotating shaft 2 and a second rotating shaft 4, which are parallel to each other. The gear 1 is limitedly connected to the valve body through the first rotating shaft 2. The guide block 6 is provided below the bearing 3, and the guide block 6 is connected to the bearing 3 through the second rotating shaft 4.

[0032] The valve stem 8 is vertically arranged, the top end of the valve stem 8 is connected to the guide block 6 , the spring 7 is sleeved on the outside of the valve stem 8 , and the top end of the spring 7 abuts against the guide block 6 .

[0033] In this embodiment, it should be noted that during use, the motor drives the gear 1 to rotate forward or reverse, and the cam structure 9 rotates accordingly, driving the bearing 3 to roll along the arc-shaped slide groove. During the rolling process, the horizontal position of the bearing 3 remains unchanged, but the height position will rise and fall, thereby the guide block 6 rises and falls, driving the valve stem 8 and the valve disc to move up and down, thereby realizing the opening and closing of the valve.

[0034] The technical effect achieved by this embodiment is: during use, when the valve is opened and closed, the outer ring of the bearing 3 is always subjected to rolling friction under the action of the cam structure 9, the friction force and friction loss are small, and the closing force is significantly improved. At the same time, the bearing 3 and the cam structure 9 are not easy to wear and have a longer service life.

[0035] Example 2

[0036] like Figures 1 to 4 As shown, this embodiment provides another EGR lift valve bearing reset structure, the structure of which includes all the contents of embodiment 1, and only the different parts are described below.

[0037] In this embodiment, a connecting ear is provided on the top of the guide block 6 , and the connecting ear is parallel to the outer end surface of the gear 1 . The guide block 6 is connected to the second rotating shaft 4 via the connecting ear.

[0038] In this embodiment, it should be noted that a magnet 5 is further included, and the magnet 5 is arranged on the connecting ear. Specifically, the connecting ear and the guide block 6 are an integrated structure, and a mounting groove is provided on the side of the connecting ear facing away from the gear 1 or the side of the connecting ear, and the magnet 5 is arranged in the mounting groove. Specifically, the magnet 5 can be connected to the guide block by bonding or integral injection molding.

[0039] The technical effects achieved by this embodiment are as follows: a connecting ear is provided on the top of the guide block 6, and the mounting method of the bearing 3 on the guide block 6 is changed to a cantilever mounting, which is more conducive to the conduction of force; by providing the magnet 5, the magnet 5 is responsible for transmitting the motion signal, and the opening and closing status of the valve can be fed back in real time.

[0040] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications or improvements may be made to the present invention. Therefore, such modifications or improvements, without departing from the spirit of the present invention, are within the scope of protection claimed herein.

[0041] The terms "upper", "lower", "left", "right", "middle", etc. used in this specification are only for the convenience of description and are not intended to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be considered as the scope of implementation of the present invention without substantially changing the technical content.

Claims

1. An EGR poppet valve bearing reset structure, characterized in that: It comprises a gear (1), a cam structure (9), a guide block (6), a spring (7) and a valve stem (8), wherein the cam structure (9) is arranged at the center of the outer end surface of the gear (1); An accommodating groove (10) is provided on the outer end surface of the gear (1), the cam structure (9) is provided in the accommodating groove (10), and the cam structure (9) and the accommodating groove (10) together form an arc-shaped sliding groove; The bearing (3) is rollingly arranged in the arc-shaped chute, and the outer ring of the bearing (3) is rollingly connected to the inner side wall of the arc-shaped chute; The gear (1) and the bearing (3) are respectively provided with a first rotating shaft (2) and a second rotating shaft (4); the gear (1) is limitedly connected to the valve body via the first rotating shaft (2); the guide block (6) is arranged below the bearing (3); and the guide block (6) is connected to the bearing (3) via the second rotating shaft (4); The valve stem (8) is vertically arranged, the top end of the valve stem (8) is connected to the guide block (6), the spring (7) is sleeved on the outside of the valve stem (8), and the top end of the spring (7) abuts against the guide block (6).

2. The EGR poppet valve bearing reset structure according to claim 1, characterized in that: The cam structure (9) is coaxial with the gear (1).

3. The EGR poppet valve bearing reset structure according to claim 2, characterized in that: The gear (1) and the cam structure (9) are an integrated structure.

4. The EGR poppet valve bearing reset structure according to claim 1, characterized in that: A connecting ear is provided on the top of the guide block (6), the connecting ear being parallel to the outer end surface of the gear (1), and the guide block (6) is connected to the second rotating shaft (4) via the connecting ear.

5. The EGR poppet valve bearing reset structure according to claim 4, characterized in that: It also includes a magnet (5), which is arranged on the connecting ear.

6. The EGR poppet valve bearing reset structure according to claim 5, characterized in that: The connecting ear is provided with a mounting groove, and the magnet (5) is arranged in the mounting groove.

7. The EGR poppet valve bearing reset structure according to claim 4, characterized in that: The connecting ear and the guide block (6) are an integral structure.

8. The EGR poppet valve bearing reset structure according to claim 1, characterized in that: The bearing (3) is a ball bearing (3).

Images