Valve clearance adjustment device

Abstract

The invention discloses a valve clearance adjustment device, comprising: a machine body; a screwdriver component, which is installed on the machine body through a bearing assembly; an angle limit assembly, which comprises a one-way bearing and an angle limit block, wherein the one-way bearing is installed on the machine body, the inner ring of the one-way bearing is in clearance with the screwdriver component, the inner ring of the one-way bearing is provided with a stop block, the angle limit block is fixedly connected with the screwdriver component, the angle limit block has a first limit portion and a second limit portion along the circumferential direction, a reverse loosening angle is defined between the first limit portion and the second limit portion, the stop block is located in the reverse loosening angle, so as to respectively abut against the first limit portion and the second limit portion when the screwdriver component rotates in different directions; and a nut locking sleeve, which is sleeved on the outside of the screwdriver component. The valve clearance accuracy is controlled by the reverse loosening angle of the angle limit block, the accuracy requirement of the power source driving the screwdriver component is not high, the cost is lower, and there is no need for long-term operation familiarity, the operation is simple and the working hours are short, and the valve clearance consistency is high.

Description

Technical Field

[0001] This invention relates to the field of engines, and in particular to a valve clearance adjustment device. Background Technology

[0002] Currently, valve clearance adjustment methods mainly include the following: ① Manual adjustment: valve clearance is manually adjusted using tooling fixtures and clearance measuring tools; ② External tightening tool adjustment: tooling fixtures are driven by electricity or tightening tools, and are manually placed on the workpiece, and the power source is started to complete the adjustment; ③ Automatic adjustment device: the workpiece enters the equipment, and the equipment automatically completes the entire adjustment process.

[0003] The above adjustment methods have the following shortcomings: ① Manual adjustment: It takes a long time, has poor consistency, and requires a long time for personnel to become proficient; existing related patents focus on valve adjustment fixtures and auxiliary crankshaft rotation tools to increase operational convenience; wear of clearance measuring tools will affect valve clearance accuracy; ② External tightening tool adjustment: In existing related patents, the locking nut and adjusting stud use different power sources, or the same power source, with special mechanisms or actions to achieve power output switching; servo motors are used to control the rotation angle, thereby controlling the clearance; the tightening power source is a special wrench, and the valve clearance is controlled by a servo motor, which is costly; the overall mechanism is complex; only one valve can be adjusted at a time, which is inefficient; ③ Automatic adjustment equipment: It includes workpiece positioning, crankshaft rotation, valve adjustment and other mechanisms, which are costly, complex in structure, and have poor compatibility. Summary of the Invention

[0004] The purpose of this invention is to at least solve one of the technical problems existing in the prior art and to provide a valve clearance adjustment device.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] A valve clearance adjusting device, comprising:

[0007] Organism;

[0008] The screwdriver component is mounted to the body via a bearing assembly;

[0009] An angle limiting assembly includes a one-way bearing and an angle limiting block. The one-way bearing is mounted on the machine body. The inner ring of the one-way bearing is clearance-fitted with the screwdriver component. The inner ring of the one-way bearing is provided with a stop. The angle limiting block is fixedly connected to the screwdriver component. The angle limiting block has a first limiting part and a second limiting part along the circumferential direction. A reverse loosening angle is defined between the first limiting part and the second limiting part. The stop is located in the reverse loosening angle so as to abut against the first limiting part and the second limiting part respectively when the screwdriver component rotates in different directions.

[0010] A nut locking sleeve is fitted over the outside of the screwdriver assembly.

[0011] In some embodiments, it also includes:

[0012] A drive assembly includes a drive shaft that transmits power to the screwdriver component via a friction plate.

[0013] In some embodiments, the machine body is provided with an adjusting bolt, the adjusting bolt has a hollow inner hole, the drive shaft passes through the inner hole, the end of the drive shaft is provided with a friction plate that cooperates with the screwdriver component, the adjusting bolt is provided with an elastic component that applies axial force to the drive shaft and an adjusting nut that adjusts the preload of the elastic component.

[0014] In some embodiments, the drive shaft is externally connected to a first power source.

[0015] In some embodiments, the angle limiting block includes a first angle limiting block and a second angle limiting block, the first angle limiting block and the second angle limiting block are axially disposed on both sides of the one-way bearing, and the inner ring of the one-way bearing is provided with a first stop block that cooperates with the first angle limiting block and a second stop block that cooperates with the second angle limiting block.

[0016] In some embodiments, the bearing assembly includes a radial bearing and a thrust bearing.

[0017] In some embodiments, both the one-way bearing and the radial bearing are mounted on the machine body via bearing housings.

[0018] In some embodiments, a second power source is also included to drive the nut locking sleeve.

[0019] In some embodiments, the nut locking sleeve is provided with a driven gear, and the output end of the second power source is provided with a driving gear that drives and cooperates with the driven gear.

[0020] One of the above technical solutions has at least one of the following advantages or beneficial effects: When adjusting the valve clearance, the valve clearance stud is tightened using a screwdriver assembly. During this process, the screwdriver assembly is tightly fitted with an angle limiting block, causing the angle limiting block to drive the one-way bearing stop to rotate along the allowable direction of the one-way bearing. The first limiting part of the angle limiting block is in contact with the stop. The screwdriver assembly is then rotated in the opposite direction to loosen the valve clearance stud. During this process, when the second limiting part of the angle limiting block rotates to the other end and is in contact with the stop, it stops rotating along with the screwdriver assembly under the action of the one-way bearing. Since the angle of the loosening adjustment corresponds to the pitch of the valve clearance stud, the valve clearance stud is ultimately adjusted to the appropriate position. Finally, the nut is tightened using a nut locking sleeve to lock the valve clearance stud. This technical solution controls the valve clearance accuracy through the loosening angle of the angle limiting block. It does not require high precision from the power source driving the screwdriver assembly, has lower costs, does not require extensive training, is simple to operate, has short working hours, and provides high valve clearance consistency and a high pass rate.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is a schematic diagram of an embodiment of the present invention;

[0024] Figure 2 yes Figure 1 A top view of an embodiment shown;

[0025] Figure 3 yes Figure 1 The diagram shows the internal structure of an angle limiting component in one embodiment. Detailed Implementation

[0026] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0027] In this invention, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this invention, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0028] In this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number. In the description of this invention, the terms "first" and "second" are used only to distinguish technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0029] In this invention, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention based on the specific content of the technical solution.

[0030] See Figure 1 , Figure 2 , Figure 3 An embodiment of the present invention provides a valve clearance adjustment device, including a body 1, a screwdriver component 2, an angle limiting component 3, and a nut locking sleeve 4.

[0031] The screwdriver component 2 is used to tighten or loosen the valve clearance stud. The screwdriver component 2 includes a shank and a head. The shank of the screwdriver component 2 is mounted on the body 1 via a bearing assembly. The head of the screwdriver component 2 is configured as slotted, Phillips, internal hexagon, or external hexagon, depending on the shape of the valve clearance stud.

[0032] See Figure 1 , Figure 3 The angle limiting assembly 3 includes a one-way bearing 31 and an angle limiting block 32. The one-way bearing 31 is mounted on the body 1, and its inner ring is clearance-fitted with the screwdriver component 2. The inner ring of the one-way bearing 31 and the screwdriver component 2 can rotate independently. The inner ring of the one-way bearing 31 is provided with a stop block 33. The angle limiting block 32 is fixedly connected to the screwdriver component 2. The angle limiting block 32 has a first limiting part 34 and a second limiting part 35 along the circumferential direction. The first limiting part 34 and the second limiting part 35 define a reverse loosening angle along the circumferential direction of the screwdriver component 2. The stop block 33 is located in the reverse loosening angle so that it abuts against the first limiting part 34 and the second limiting part 35 respectively when the screwdriver component 2 rotates in different directions. The nut locking sleeve 4 is sleeved on the outside of the screwdriver component 2. The reverse loosening angle is set according to the pitch of the valve clearance stud to ensure that when the screwdriver part 2 drives the valve clearance stud to rotate through the specific angle of the reverse loosening angle, the valve clearance stud is adjusted to the appropriate valve clearance position.

[0033] Combination Figure 1 , Figure 2 , Figure 3 When adjusting the valve clearance, the screwdriver assembly 2 tightens the valve clearance stud under external force. During this process, the screwdriver assembly 2 is tightly fitted with the angle limiting block 32, causing the angle limiting block 32 to drive the stop block 33 of the one-way bearing 31 to rotate in the allowed direction of the one-way bearing 31. The first limiting part 34 of the angle limiting block 32 is in contact with the stop block 33. Reversing the screwdriver assembly 2 loosens the valve clearance stud. During this process, when the second limiting part 35 of the angle limiting block 32 at the other end is in contact with the stop block 33, it stops rotating together with the screwdriver assembly 2 under the action of the one-way bearing 31. Since the angle of the loosening corresponds to the pitch of the valve clearance stud, the valve clearance stud is finally adjusted to the appropriate position. Finally, the nut is tightened using the nut locking sleeve 4 to lock the valve clearance stud. This technical solution controls valve clearance accuracy by adjusting the angle of the angle limit block 32. It does not require high precision from the power source of the drive screwdriver component 2, has lower cost, does not require long-term operation training, is simple to operate and has short working time, and has high valve clearance consistency and high pass rate, without the need for clearance measuring tools.

[0034] In some embodiments, see Figure 1 , Figure 2 , Figure 3 The valve clearance adjustment device also includes a drive assembly, which includes a drive shaft 5. The drive shaft 5 transmits power to the screwdriver assembly 2 via a friction plate 51. When the screwdriver assembly 2 tightens the valve clearance stud, the driving force of the drive shaft 5 exceeds the upper limit of the friction force of the friction plate 51 between the drive shaft 5 and the screwdriver assembly 2, causing the friction plate 51 to slip and the screwdriver assembly 2 to stop tightening. When the valve clearance stud is loosened, the angle limiting block 32 rotates until the second limiting part 35 at the other end engages with the stop block 33. Under the action of the one-way bearing 31, it stops rotating along with the screwdriver assembly 2, and the friction plate 51 slips. At this time, the included angle through which the screwdriver assembly 2 has rotated is the loosening angle. The power transmission between the drive shaft 5 and the screwdriver assembly 2 is achieved through the friction plate 51, which allows the driving force of the drive shaft 5 to be transmitted to the screwdriver assembly 2 more accurately, avoiding damage to the valve clearance stud and the one-way bearing 31.

[0035] Further, see Figure 1 , Figure 2 , Figure 3The machine body 1 is equipped with an adjusting bolt 52, which has a hollow inner hole through which the drive shaft 5 passes. The end of the drive shaft 5 is equipped with a friction plate 51 that mates with the screwdriver component 2. The adjusting bolt 52 is equipped with an elastic component 53 that applies axial force to the drive shaft 5 and an adjusting nut 54 that adjusts the preload of the elastic component 53. The elastic component 53 can be a spring, a sheet spring, or the like. By adjusting the position of the adjusting nut 54 on the adjusting bolt 52, the preload of the elastic component 53 can be adjusted, thereby changing the maximum static friction between the friction plates 51.

[0036] Drive shaft 5 can be driven manually or electrically, for example in... Figure 1 In some embodiments shown, the drive shaft 5 is externally connected to a first power source 55, which can be a conventional motor, a servo motor, or an electric tightening tool. The first power source 55 can be directly integrated into the valve clearance adjustment device, eliminating the need for external tools, resulting in a more compact size and lighter weight. Multiple valves can be adjusted simultaneously through various arrangements and combinations.

[0037] One or two angle limiting blocks 32 can be provided; see [reference] in some embodiments. Figure 3 The angle limiting block 32 includes a first angle limiting block 321 and a second angle limiting block 322. The first angle limiting block 321 and the second angle limiting block 322 are axially arranged on both sides of the one-way bearing 31. The inner ring of the one-way bearing 31 is provided with a first stop block that cooperates with the first angle limiting block 321 and a second stop block that cooperates with the second angle limiting block 322. The symmetrically arranged first angle limiting block 321 and second angle limiting block 322 can provide balanced forces from both sides to the one-way bearing 31, ensuring the rotation angle accuracy of the screwdriver component 2 and extending the service life of the one-way bearing 31.

[0038] The bearing assembly includes a radial bearing 61 and a thrust bearing 62 to provide radial and axial support for the screwdriver component 2.

[0039] Further, see Figure 1 Both the one-way bearing 31 and the radial bearing 61 are mounted on the machine body 1 via bearing housings.

[0040] The nut locking sleeve 4 can be driven manually or electrically, for example in... Figure 1 In some embodiments shown, the valve clearance adjusting device further includes a second power source 41 for driving the nut locking sleeve 4. The second power source 41 can be selected from a conventional motor, a servo motor, or an electric tightening tool. The second power source 41 can be directly or indirectly connected to the nut locking sleeve 4 to achieve power transmission, for example in… Figure 1In some embodiments shown, the nut locking sleeve 4 is provided with a driven gear 42, and the output end of the second power source 41 is provided with a driving gear 43 that drives and meshes with the driven gear 42. The driven gear 42 and the driving gear 43 can be spur gears or helical gears. The driven gear 42 and the driving gear 43 are directly meshed or indirectly connected, which, while realizing power transmission, also makes the second power source 41 deviate from the axis of the screwdriver component 2, avoiding interference with the first power source 55.

[0041] In the description of this specification, references to terms such as "example," "embodiment," or "some embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0042] Of course, the present invention is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A valve clearance adjustment device, characterized in that: include: Body; A screwdriver component is mounted on the body via a bearing assembly; An angle limit assembly comprises a one-way bearing and an angle limit block, wherein the one-way bearing is mounted on the machine body, the inner ring of the one-way bearing is in clearance fit with the screwdriver component, the inner ring of the one-way bearing is provided with a stop block, the angle limit block is fixedly connected to the screwdriver component, the angle limit block has a first limit portion and a second limit portion along the circumferential direction, an anti-loose angle is defined between the first limit portion and the second limit portion, the stop block is located in the anti-loose angle so as to respectively abut against the first limit portion and the second limit portion when the screwdriver component rotates in different directions, the anti-loose angle is set according to the pitch of the valve clearance stud to ensure that when the screwdriver component drives the valve clearance stud to rotate through the specific angle of the anti-loose angle, the valve clearance stud is just adjusted to an appropriate valve clearance position; The nut locking sleeve is sleeved on the outside of the screwdriver component.

2. The valve clearance adjustment device according to claim 1, characterized in that: Also includes: The driving assembly comprises a driving shaft, and the driving shaft realizes power transmission with the screwdriver component through a friction plate.

3. The valve clearance adjustment device according to claim 2, characterized in that: The body is provided with an adjusting bolt, the adjusting bolt is provided with a hollow inner hole, the driving shaft passes through the inner hole, the end of the driving shaft is provided with a friction plate cooperating with the screwdriver component, the adjusting bolt is provided with an elastic component applying axial force to the driving shaft and an adjusting nut for adjusting the pre-tightening force of the elastic component.

4. The valve clearance adjustment device according to claim 2 or 3, characterized in that: The driving shaft is externally connected to a first power source.

5. The valve clearance adjustment device according to claim 1, characterized in that: The angle limit block includes a first angle limit block and a second angle limit block, which are axially arranged on both sides of the one-way bearing, and the inner ring of the one-way bearing is provided with a first stop block that cooperates with the first angle limit block and a second stop block that cooperates with the second angle limit block.

6. The valve clearance adjustment device according to claim 1, characterized in that: The bearing assembly includes a radial bearing and a thrust bearing.

7. The valve clearance adjustment device according to claim 6, characterized in that: The one-way bearing and the radial bearing are both installed on the machine body through a bearing seat.

8. The valve clearance adjustment device according to claim 1, characterized in that: Also included is a second power source for driving the nut locking sleeve.

9. The valve clearance adjustment device according to claim 8, characterized in that: The nut locking sleeve is provided with a driven gear, and the output end of the second power source is provided with a driving gear that is transmission-matched with the driven gear.

Images