Transmission shaft limiting structure of variable speed pump

Abstract

The utility model discloses a variable-speed pump transmission shaft limiting structure which comprises a pump gear and a transmission shaft, a shaft hole of the pump gear and the peripheral face of the transmission shaft are respectively provided with a check ring groove, the pump gear and the transmission shaft are connected through a check ring arranged in the check ring groove of the transmission shaft, and the diameter of the outermost side of the check ring is larger than the outer diameter of the transmission shaft. According to the variable-speed pump, the transmission shaft and the pump gear can be fixed through the check ring, a fixing structure on the side of the variable-speed pump is omitted, and the variable-speed pump is compatible with pump gears with various axial lengths.

Description

Technical Field

[0001] The utility model relates to a transmission structure, in particular to a transmission shaft limiting structure of a variable speed pump. Background Art

[0002] During the production and assembly of the gearbox, Figure 1 As shown, the pump gear 5 is connected to the variable speed pump assembly through the transmission shaft 2, and two retaining rings are arranged on the outer cylindrical surface of the transmission shaft, one on the side of the small end face of the pump gear and the other on the side of the variable speed pump output shaft, to limit the position of the transmission shaft and prevent the axial movement of the transmission shaft from causing the transmission shaft to be deformed or twisted due to unbalanced load. However, the position of the retaining ring on the transmission shaft is fixed. If the overall axial length of the pump gear is too long, the pump gear and the transmission shaft will be too tight or cannot be assembled. Over-tight assembly will cause the temperature of the gearbox to be too high during operation, causing sintering of the variable speed pump. If the distance between the transmission shaft retaining rings is reduced, the transmission shaft will move axially, the transmission noise will be louder, and the transmission shaft may even be deformed or twisted due to unbalanced load.

[0003] The utility model patent with publication number CN 205423775 U discloses a fixing structure of a gearbox odometer, in which a protrusion is provided on one of the inner wall surface of the shaft hole connected to the transmission shaft and the outer shell of the transmission shaft, and the other is provided with an upper annular groove. The protrusion is located in the annular groove, which plays an axial limiting role on the transmission shaft. This scheme is suitable for the working conditions where the shaft hole is formed by splicing multiple arc-shaped units, or the limit pin is retractable along the radial direction of the transmission shaft, but is not suitable for fixed installation of the pump gear and the transmission shaft. Utility Model Content

[0004] Purpose of the utility model: The purpose of the utility model is to provide a variable speed pump transmission shaft limiting structure suitable for closing the gear shaft hole.

[0005] Technical solution: The utility model describes a variable speed pump drive shaft limiting structure, comprising a pump gear and a drive shaft, wherein the shaft hole of the pump gear and the outer peripheral surface of the drive shaft are respectively provided with a retaining ring groove, the pump gear and the drive shaft are connected via a retaining ring provided in the retaining ring groove of the drive shaft, and the outermost diameter of the retaining ring is larger than the outer diameter of the drive shaft.

[0006] In the utility model, the transmission shaft and the pump gear can be fixed by a retaining ring, thereby eliminating the fixing structure on the variable speed pump side and being compatible with pump gears of various axial lengths.

[0007] Preferably, the retaining ring has a notch, and the inner diameter of the annular retaining ring is larger than the inner diameter of the retaining ring groove of the transmission shaft. When the annular retaining ring is sleeved on the outside of the transmission shaft, the diameter of the retaining ring can be reduced by squeezing the notch, so that the retaining ring and the transmission shaft can enter the shaft hole of the pump gear together, and when the retaining ring grooves of the pump gear and the transmission shaft are aligned, the retaining ring returns to its original state and is located in the space enclosed by the pump gear and the retaining ring groove of the transmission shaft, so that the transmission shaft and the pump gear are fixed.

[0008] Preferably, the widths of the retaining ring grooves of the transmission shaft and the gear pump are consistent.

[0009] Preferably, a plurality of fixing pins are provided on one side of the retaining ring, and the outer diameter of the circular ring formed by the fixing pins is larger than the outer diameter of the transmission shaft.

[0010] Preferably, the inner diameter of the ring formed by the fixing pin is larger than the inner diameter of the retaining ring groove of the transmission shaft. During installation, the fixing pin is deformed toward the center of the transmission shaft, and when the retaining ring grooves of the pump gear and the transmission shaft are opposite, the fixing pin returns to its original state and is located in the space enclosed by the pump gear and the retaining ring groove of the transmission shaft, so that the transmission shaft and the pump gear are fixed.

[0011] Preferably, the width of the retaining ring groove of the pump gear is smaller than the width of the retaining ring groove of the transmission shaft.

[0012] Preferably, the cross section of the fixing pin is a right-angled trapezoid.

[0013] Beneficial effects: Compared with the prior art, the utility model has the following advantages: 1. It is suitable for the installation of circumferentially closed shaft holes and transmission shafts; 2. It has a simple structure; 3. It is compatible with a variety of pump gears. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the variable speed pump transmission shaft limit structure in the prior art;

[0015] Figure 2 This is a schematic diagram of the limit structure of the transmission shaft of the variable speed pump of the utility model;

[0016] Figure 3 This is a schematic diagram of the pump gear structure of the utility model;

[0017] Figure 4 This is a schematic diagram of the retaining ring structure of the utility model;

[0018] Figure 5 It is a side view of the retaining ring structure of the utility model. DETAILED DESCRIPTION

[0019] The technical solution of the utility model is further described below in conjunction with the accompanying drawings.

[0020] Example 1: Figure 2 The figure is a schematic diagram of the variable speed pump transmission shaft connection structure of the utility model. In the housing 6, the pump gear 5 is interference fit with the outer ring of the bearing 4, the support shaft 7 is interference fit with the inner ring of the bearing 4, the support shaft 7 is connected to the torque converter housing 6 by bolts 8, and the pump gear 5 is axially limited in the housing 6. The external spline at one end of the transmission shaft 1 is meshed with the internal spline of the pump gear 5, and the other end is meshed with the internal spline of the output shaft of the variable speed pump assembly 2.

[0021] like Figure 2 and Figure 3 As shown, the inner spline of the pump gear 5 and the transmission shaft 1 are respectively provided with a retaining ring groove 9, the width of the retaining ring groove 9 of the transmission shaft is consistent with that of the pump gear, the retaining ring 3 is installed in the retaining ring groove 9 of the transmission shaft 1, and the pump gear 5 and the transmission shaft 1 are connected through the retaining ring 3 in the retaining ring groove 9. When the transmission shaft 1 is axially offset, the transmission shaft 1 and the pump gear 5 press the opposite sides of the retaining ring 3 respectively, so that the pump gear 5, the retaining ring 3 and the transmission shaft 1 interact with each other to limit the axial movement of the transmission shaft 1.

[0022] The retaining ring 3 is an annular retaining ring with a notch. The outer diameter of the retaining ring 3 is larger than the outer diameter of the transmission shaft 1, and the inner diameter of the retaining ring 3 is larger than the inner diameter of the retaining ring groove 9 of the transmission shaft. Therefore, when the transmission shaft 1 and the pump gear are connected, the inner diameter of the retaining ring 3 can be squeezed and reduced. During installation, the retaining ring 3 enters the shaft hole of the pump gear 5 together with the transmission shaft 1. When the retaining ring grooves of the pump gear and the transmission shaft are aligned, the retaining ring returns to its original state and is located in the space enclosed by the pump gear and the retaining ring groove of the transmission shaft, so that the transmission shaft and the pump gear are fixed.

[0023] Embodiment 2: In this embodiment, the following variations are possible:

[0024] The width of the retaining ring groove 9 of the transmission shaft is greater than the width of the retaining ring groove 9 of the pump gear. The retaining ring 3 is an annular retaining ring, and the outer diameter of the retaining ring 3 is less than or equal to the outer diameter of the transmission shaft 1, and the inner diameter is greater than or equal to the inner diameter of the retaining ring groove 9 of the transmission shaft 1. A plurality of fixing pins 31 are arranged in a circular array on one side of the retaining ring. The inner diameter of the circular ring formed by the fixing pins 31 is greater than the inner diameter of the retaining ring groove 9 of the transmission shaft, and the outer diameter is greater than the outer diameter of the transmission shaft. During installation, the fixing pins 31 are deformed toward the center of the transmission shaft 1, and when the pump gear 5 and the retaining ring groove 9 of the transmission shaft 1 are partially opposite, the fixing pins 31 return to their original state and are located in the space enclosed by the pump gear and the retaining ring groove of the transmission shaft, so that the transmission shaft and the pump gear 5 are fixed.

[0025] The cross section of the fixing pin 31 is a right-angled trapezoid, and its waist surface close to the center of the transmission shaft 1 is inclined to facilitate the deformation of the fixing pin. The waist surface close to the center of the transmission shaft 1 is a right-angled waist surface to prevent the transmission shaft 1 and the pump gear 5 from disengaging when the transmission shaft 1 moves back (to the left in the figure).

Claims

1. A variable speed pump transmission shaft limiting structure, comprising a pump gear (5) and a transmission shaft (1), characterized in that: The shaft hole of the pump gear (5) and the outer peripheral surface of the transmission shaft (1) are respectively provided with a retaining ring groove (9); the pump gear and the transmission shaft are connected via a retaining ring (3) provided in the retaining ring groove of the transmission shaft; the outermost diameter of the retaining ring (3) is larger than the outer diameter of the transmission shaft.

2. The variable speed pump transmission shaft limiting structure according to claim 1, characterized in that: The retaining ring has a notch, and the inner diameter of the retaining ring is larger than the inner diameter of the retaining ring groove of the transmission shaft.

3. The variable speed pump transmission shaft limiting structure according to claim 1 or 2, characterized in that: The widths of the retaining ring groove (9) of the transmission shaft and the gear pump are consistent.

4. The variable speed pump transmission shaft limiting structure according to claim 1, characterized in that: A plurality of fixing pins (31) are provided on one side of the retaining ring (3); the outer diameter of the circular ring formed by the fixing pins is larger than the outer diameter of the transmission shaft.

5. The variable speed pump transmission shaft limiting structure according to claim 4, characterized in that: The inner diameter of the circular ring formed by the fixing pin (31) is larger than the inner diameter of the retaining ring groove of the transmission shaft.

6. The variable speed pump transmission shaft limiting structure according to claim 4, characterized in that: The retaining ring groove width of the pump gear is smaller than the retaining ring groove width of the transmission shaft.

7. The variable speed pump transmission shaft limiting structure according to claim 4, characterized in that: The cross section of the fixing pin (31) is a right-angled trapezoid.

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