Gear coating and split machining gear

Abstract

The application discloses a split type machining gear for a coated gear pump and relates to the technical field of gear pumps. The split type machining gear comprises a gear and a supporting shaft which is detachably connected with the gear. The surface of one end of the gear is sequentially provided with a first stepped hole and a second stepped hole which are in communication along an axial direction. The supporting shaft is provided with a boss at one end. The boss is in interference fit with the first stepped hole. The one end of the supporting shaft is in sealing fit with the second stepped hole. In the application, the gear and the supporting shaft are designed in a split type. The gear and the supporting shaft are processed in a split type so as to facilitate the gear end surface to be machined by a grinding machine, reduce the tolerance band of the gear thickness, and make the boss on the supporting shaft in interference fit with the first stepped hole on the gear and the supporting shaft in sealing fit with the second stepped hole. Thus, the paint can be prevented from entering the gap between the supporting shaft and the gear.

Description

Technical Field

[0001] This invention relates to the field of gear pump technology, and in particular to a split-type machined gear for a coated gear pump. Background Technology

[0002] In the automotive painting process, the gear pump plays a crucial role in precisely metering the paint during painting, thus requiring high flow accuracy. Internal leakage in the gear pump directly impacts its flow accuracy, leading to a decrease in painting quality. Within the gear pump, internal leakage between the gear end face and the cover plate accounts for 80% of the total internal leakage flow. This internal leakage flows from the high-pressure zone of the gear pump, through the gap between the gear and the cover plate, to the low-pressure zone, causing a decrease in flow accuracy.

[0003] The traditional integrated gear design of coating gear pumps, where the drive gear and gear shaft are one piece, makes it impossible for the gear end face to be effectively precision machined by a grinding machine. The gear thickness tolerance cannot be reduced to the required tolerance zone, resulting in a high scrap rate in gear processing. Summary of the Invention

[0004] The purpose of this invention is to provide a split-type machining gear for coating gear pumps, in order to solve the above-mentioned technical problems.

[0005] The technical solution adopted in this invention is as follows:

[0006] A split-type machining gear for a coating gear pump includes a gear and a support shaft detachably connected to the gear. One end surface of the gear has a first stepped hole and a second stepped hole that are interconnected along the axial direction. One end of the support shaft has a boss that is interference-fitted with the first stepped hole and a sealing fit between one end of the support shaft and the second stepped hole.

[0007] Preferably, the diameter of the first stepped hole is smaller than the diameter of the second stepped hole.

[0008] Preferably, a sealing ring is also included, and a gap is provided between the outer peripheral wall of the support shaft and the inner peripheral wall of the second stepped hole, and the sealing ring is fitted on the outer peripheral wall of the support shaft.

[0009] As a further preferred embodiment, the outer peripheral wall of the sealing ring abuts against the inner peripheral wall of the second stepped hole to achieve a sealing fit between the support shaft and the second stepped hole.

[0010] Preferably, the first stepped hole, the second stepped hole, the support shaft, and the boss are coaxially arranged.

[0011] As a further preferred embodiment, an annular groove is formed on the outer shaft wall of the support shaft, the sealing ring is disposed in the annular groove, and the sealing ring at least partially protrudes from the annular groove.

[0012] The above technical solution has the following advantages or beneficial effects:

[0013] In this invention, by adopting a split design for the gear and the support shaft, the gear and the support shaft are processed separately, so that the end face of the gear can be processed by a grinding machine, reducing the tolerance zone of the gear thickness. The boss on the support shaft is interference-fitted with the first stepped hole on the gear, and the support shaft is sealed with the second stepped hole, which can prevent paint from entering the gap between the support shaft and the gear. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the split-type machining gear of the coating gear pump in this invention;

[0015] Figure 2 This is an exploded view of the split-type gear processing of the coating gear pump in this invention.

[0016] In the diagram: 1. Gear; 2. Support shaft; 3. First stepped hole; 4. Second stepped hole; 5. Boss; 6. Sealing ring. Detailed Implementation

[0017] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] In the description of this invention, it should be noted that terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] Figure 1 This is a schematic diagram of the split-type machining gear of the coating gear pump in this invention; Figure 2 This is an exploded view of the split-type machining gear of the coating gear pump in this invention. Please refer to [link / reference]. Figures 1 to 2 The diagram illustrates a preferred embodiment of a split-type machining gear for a coating gear pump. It includes a gear 1 and a support shaft 2 detachably connected to the gear 1. One end surface of the gear 1 has sequentially interconnected first stepped holes 3 and second stepped holes 4 along the axial direction. One end of the support shaft 2 has a boss 5, which is interference-fitted with the first stepped hole 3, and one end of the support shaft 2 is sealingly fitted with the second stepped hole 4. See also... Figure 1 As shown, the boss 5 on the support shaft 2 is integrally formed with the support shaft 2. By adopting a separate configuration between the gear 1 and the support shaft 2, it is easier to process the gear 1 and the support shaft 2 separately, facilitating the grinding of the end face of the gear 1 and reducing the tolerance zone of the gear 1's thickness. Since there is no shaft on one end face of the gear 1, it is easier to process and ensures a smaller tolerance zone for the gear 1's thickness. A first stepped hole 3 and a second stepped hole 4 are formed on one end face of the gear 1 for mounting the boss 5 and the support shaft 2. The support shaft 2 is sealed to the second stepped hole 4, ensuring that paint does not enter the gap between the support shaft 2 and the second stepped hole 4.

[0021] In this embodiment, the high-flow-rate coating gear 1 pump needs to reduce the gap between the end face of gear 1 and the cover plate, and reduce the tolerance range of gear 1 thickness. Traditional one-piece gear designs, where the drive gear and gear shaft are integrated, prevent the gear end face from being effectively precision-machined on a grinding machine, and the gear thickness tolerance cannot be reduced to the required tolerance zone, resulting in a high scrap rate during gear machining. This embodiment solves this problem by adopting a separate design for gear 1 and support shaft 2.

[0022] Furthermore, as a preferred embodiment, the diameter of the first stepped hole 3 is smaller than the diameter of the second stepped hole 4. See also Figure 2 As shown, the diameter of the second stepped hole 4 is at least 1.5 to 2 times the diameter of the first stepped hole 3.

[0023] Furthermore, as a preferred embodiment, a sealing ring 6 is also included. A gap is provided between the outer peripheral wall of the support shaft 2 and the inner peripheral wall of the second stepped hole 4, and the sealing ring 6 is fitted onto the outer peripheral wall of the support shaft 2. See also Figure 1 As shown, in this embodiment, a sealing ring 6 is provided on the outer peripheral wall of the support shaft 2 to prevent paint from entering the gap between the support shaft 2 and the second stepped hole 4, thus preventing internal leakage from affecting the flow accuracy of the gear 1 pump. The sealing rings 6 can be multiple, with at least some of them located near the opening of the second stepped hole 4.

[0024] Furthermore, as a preferred embodiment, the outer peripheral wall of the sealing ring 6 abuts against the inner peripheral wall of the second stepped hole 4 to achieve a sealing fit between the support shaft 2 and the second stepped hole 4. An annular groove is formed on the outer shaft wall of the support shaft 2, and the sealing ring 6 is disposed within the annular groove, with at least a portion of the sealing ring 6 protruding from the annular groove. In this embodiment, the annular groove facilitates the installation of the sealing ring 6 and fixes its position. Alternatively, an annular groove can also be formed on the inner peripheral wall of the second stepped hole 4, and the annular groove on the second stepped hole 4 is directly opposite the annular groove on the support shaft 2, facilitating the fixation of the sealing ring 6 and resulting in a better sealing effect.

[0025] Furthermore, as a preferred embodiment, the first stepped hole 3, the second stepped hole 4, the support shaft 2, and the boss 5 are coaxially arranged. In this embodiment, the gear 1 and the support shaft 2 are separately arranged, so that the gear 1 and the support shaft 2 can be processed separately. After processing, the gear 1 and the support shaft 2 are reassembled into one unit through an interference fit.

[0026] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A split-type machined gear for a coated gear pump, characterized in that, The device includes a gear and a support shaft detachably connected to the gear. One end surface of the gear has a first stepped hole and a second stepped hole that are interconnected along the axial direction. One end of the support shaft has a boss that is interference-fitted with the first stepped hole and a sealing fit between one end of the support shaft and the second stepped hole.

2. The split-type machining gear of the coating gear pump as described in claim 1, characterized in that, The diameter of the first stepped hole is smaller than the diameter of the second stepped hole.

3. The split-type machining gear for the coating gear pump as described in claim 1, characterized in that, It also includes a sealing ring, and there is a gap between the outer peripheral wall of the support shaft and the inner peripheral wall of the second stepped hole, and the sealing ring is fitted on the outer peripheral wall of the support shaft.

4. The split-type machining gear of the coating gear pump as described in claim 3, characterized in that, The outer peripheral wall of the sealing ring abuts against the inner peripheral wall of the second stepped hole to achieve a sealing fit between the support shaft and the second stepped hole.

5. The split-type machining gear for the coating gear pump as described in claim 1, characterized in that, The first stepped hole, the second stepped hole, the support shaft, and the boss are coaxially arranged.

6. The split-type machining gear of the coating gear pump as described in claim 3, characterized in that, An annular groove is provided on the outer shaft wall of the support shaft, and the sealing ring is disposed in the annular groove, with at least a portion of the sealing ring protruding from the annular groove.

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