Internal gear pump power transmission device of automobile hydraulic retarder

Abstract

The utility model provides an internal gear pump power transmission device of an automobile hydraulic retarder, which belongs to the technical field of truck manufacturing and comprises a pump seat plate, an outer gear ring, an inner gear ring, a transition sleeve, a power shaft and an aluminum sealing plate. The inner ring of the transition sleeve is a smooth cylindrical surface and is provided with a key slot, and the outer ring is spline teeth; the outer ring of the inner gear ring is provided with involute teeth, and the inner ring of the inner gear ring is provided with spline teeth; the power shaft is also provided with a key groove, and the transition sleeve is connected with the power shaft through a flat key. The transition sleeve is sleeved with the inner gear ring. The outer gear ring, the inner gear ring and the transition sleeve are all arranged between the pump base plate and the aluminum sealing plate. The internal gear pump is used as an oil pump for pressurizing oil of the retarder, and has the advantages that the internal gear pump is simple in structure, stable in flow and free of pulsation, and a power shaft can be coaxial with a turbine shaft of the retarder.

Description

Technical Field

[0001] The utility model belongs to the technical field of truck manufacturing, and in particular relates to an internal meshing gear pump power transmission device of a hydraulic retarder of an automobile. Background Art

[0002] The function of the hydraulic retarder of an automobile is to enable the retarder when the automobile is decelerating or going down a long slope, so that the vehicle can decelerate smoothly and avoid the wear and heat of the brake components caused by the use of brakes. The hydraulic retarder is a device that uses liquid damping to produce a retarding effect, thereby slowing down the vehicle. Installing a hydraulic retarder in the transmission system of a truck has become an urgent need for truck manufacturers and users. The retarder oil of the hydraulic retarder needs to circulate in a fixed direction. An oil pump that pressurizes the retarder oil needs to be installed in this circulation loop. Ordinary transmission devices are difficult to meet the power transmission requirements of the internal gear pump. Utility Model Content

[0003] In view of the problems raised by the background technology, the utility model uses an internal gear pump as the oil pump for pressurizing the retarder oil. The internal gear pump has the advantages of simple structure, stable flow, no pulsation, and the power shaft can be coaxial with the retarder turbine shaft. However, if the power is directly transmitted to the inner gear ring of the internal gear pump by using an ordinary flat key, since the power shaft is coaxial with the turbine shaft, the axial position of the inner gear ring on the power shaft is also fixed. During the installation of the retarder, the accumulated errors of various components are likely to cause the inner gear ring to rub against the parts at the left and right ends and be damaged.

[0004] In view of this problem, the utility model provides a power transmission device of an internal gear pump of an automobile hydraulic retarder, wherein the power shaft is coaxial with the retarder turbine shaft, an outer gear ring and an inner gear ring meshing with the outer gear ring are arranged on the pump seat plate, and a transition sleeve is used to realize the power transmission of the power shaft to the inner gear ring, and the inner gear ring meshes with the outer gear ring to rotate to pressurize the retarder oil and circulate it in a fixed direction. In the internal gear pump transmission device of the utility model, when the internal gear pump is working, an oil film is formed between the inner gear ring, the pump seat plate and the aluminum sealing plate, and the gap can be adjusted automatically, and no dry friction and damage will occur, thus solving the problem that the inner gear ring of the internal gear pump may be damaged by rubbing against the parts at the left and right ends when the power is directly transmitted to the internal gear pump using an ordinary flat key.

[0005] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0006] The power transmission device of the internal meshing gear pump of the automobile hydraulic retarder comprises a pump seat plate, an outer gear ring, an inner gear ring, a transition sleeve, a power shaft and an aluminum sealing plate; the inner ring of the transition sleeve is a smooth cylindrical surface and is provided with a keyway, and the outer ring is a spline tooth; the outer ring of the inner gear ring is an involute tooth, and the inner ring is a spline tooth; a keyway is also provided on the power shaft, and the transition sleeve is connected to the power shaft by a flat key; the inner gear ring is sleeved on the transition sleeve; the outer gear ring, the inner gear ring and the transition sleeve are all arranged between the pump seat plate and the aluminum sealing plate.

[0007] Preferably, the outer gear ring is installed on the pump base plate, the inner gear ring is installed inside the outer gear ring and meshes with the outer gear ring; the inner spline of the inner gear ring is sleeved on the outer spline of the transition sleeve; the aluminum sealing plate is installed on the right end face of the pump base plate.

[0008] Preferably, an external retaining ring for positioning is installed at the right end of the transition sleeve.

[0009] Preferably, the power shaft is coaxial with the retarder turbine shaft.

[0010] Preferably, the pump seat plate is made of aluminum alloy; the outer gear ring and the inner gear ring are made of alloy steel.

[0011] Beneficial effects of the utility model:

[0012] According to the structure of the utility model, when the retarder is working, the power is transmitted from the power shaft to the transition sleeve through the flat key, and the transition sleeve transmits the power to the inner gear ring through the spline, and the inner gear ring meshes with the outer gear ring to realize pumping oil. An oil film is formed between the left end of the outer gear ring and the inner gear ring and the pump seat plate; an oil film is formed between the right end of the outer gear ring and the inner gear ring and the aluminum sealing plate to realize liquid friction. Since there can be a certain axial movement between the inner spline of the inner gear ring and the outer spline of the transition sleeve, under the action of the oil film, it is ensured that the gap between the left end of the outer gear ring and the inner gear ring and the pump seat plate and the gap between the outer gear ring and the inner gear ring and the aluminum sealing plate can be automatically adjusted, thereby realizing liquid friction, that is, there will be no dry friction and damage between the left end of the outer gear ring and the inner gear ring and the pump seat plate and between the right end of the outer gear ring and the inner gear ring and the aluminum sealing plate. In addition, when the outer gear ring and the inner gear ring are stuck due to unexpected reasons, since the flat key connection between the power shaft and the transition sleeve is the most fragile, the power shaft rotates to cut off the flat key, and no damage to other components will be caused.

[0013] The utility model provides a power transmission device of an internal gear pump of an automobile hydraulic retarder, wherein the power shaft is coaxial with the retarder turbine shaft, an outer gear ring and an inner gear ring meshing with the outer gear ring are arranged on the pump seat plate, and a transition sleeve is used to realize the power transmission of the power shaft to the inner gear ring, and the inner gear ring meshes with the outer gear ring to rotate to pressurize the retarder oil and circulate it in a fixed direction. In the internal gear pump transmission device of the utility model, when the internal gear pump is working, an oil film is formed between the inner gear ring, the pump seat plate and the aluminum sealing plate, and the gap can be automatically adjusted, and no dry friction and damage will occur, which solves the problem that the inner gear ring of the internal gear pump may collide with the parts at the left and right ends and be damaged when the power is directly transmitted to the inner gear ring of the internal gear pump by using an ordinary flat key. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is an axial cross-sectional view of the overall structure of the utility model;

[0015] Figure 2 yes Figure 1 AA section view;

[0016] Figure 3 yes Figure 1 K-direction view;

[0017] In the figure, 1-external gear ring, 2-inner gear ring, 3-transition sleeve, 4-power shaft, 5-flat key, 6-external retaining ring, 7-aluminum sealing plate, 8-pump seat plate. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings to facilitate understanding by technicians.

[0019] In the description of the present invention, unless otherwise specified, the terms "left", "right" and the like indicate positions or state relationships based on Figure 2 The description of the orientation or state relationship is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0020] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "provided with" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention will be understood according to specific circumstances.

[0021] like Figure 1-3As shown, the internal meshing gear pump power transmission device of the automobile hydraulic retarder includes a pump seat plate 8, an outer gear ring 1, an inner gear ring 2, a transition sleeve 3, a power shaft 4 and an aluminum sealing plate 7.

[0022] The outer ring of the transition sleeve 3 is spline teeth, and the inner ring is a smooth cylindrical surface with a keyway; the outer ring of the inner gear ring 2 is involute teeth, and the inner ring is spline teeth; a keyway is also provided on the power shaft 4, and the transition sleeve 3 and the power shaft 4 are connected by a flat key 5.

[0023] The outer gear ring 1 is installed on the pump seat plate 8, and the inner gear ring 2 is installed inside the outer gear ring 1 and meshes with the outer gear ring; the inner spline of the inner gear ring 2 is mounted on the outer spline of the transition sleeve 3, and the aluminum sealing plate is installed on the right end face of the pump seat plate 8. The inner gear ring 2 and the transition sleeve 3 are spline-connected, and a certain axial displacement can be achieved between the two, and the position can be adjusted under the action of the oil film (see the following description for details). The outer gear ring 1, the inner gear ring 2 and the transition sleeve 3 are all arranged between the pump seat plate 8 and the aluminum sealing plate 7. An outer retaining ring 6 for positioning is installed on the right end of the transition sleeve 3. The power shaft 4 is coaxial with the retarder turbine shaft.

[0024] When the retarder is working, the power is transmitted from the power shaft 4 to the transition sleeve 3 through the flat key 5, and the transition sleeve 3 transmits the power to the inner gear ring 2 through the spline, and the inner gear ring 2 meshes with the outer gear ring 1 to realize pumping oil. An oil film is formed between the left end of the outer gear ring 1 and the inner gear ring 2 and the pump seat plate 8, and an oil film is also formed between the right end of the outer gear ring 1 and the inner gear ring 2 and the aluminum sealing plate 7 to realize liquid friction. Since there is a certain axial movement between the inner spline of the inner gear ring 2 and the outer spline of the transition sleeve 3, under the action of the oil film, it is ensured that the gap between the outer gear ring 1 and the inner gear ring 2 and the pump seat plate 8 and the gap between the outer gear ring 1 and the inner gear ring 2 and the aluminum sealing plate 7 can be automatically adjusted, thereby realizing liquid friction, that is, there will be no dry friction and damage between the left end of the outer gear ring 1 and the inner gear ring 2 and the pump seat plate 8, and between the right end of the outer gear ring 1 and the inner gear ring 2 and the aluminum sealing plate 7. When the outer gear ring 1 and the inner gear ring 2 are stuck due to unexpected reasons, since the flat key connection between the power shaft 4 and the transition sleeve 3 is the most vulnerable in the entire connection structure, the rotation of the power shaft 4 will cut off the flat key 5, thereby avoiding the impact of the stuck on other components and causing no damage to other components. During maintenance, the cause can be found out, repaired in time, and the flat key 5 can be replaced, which greatly reduces the equipment maintenance cost. The utility model has a simple structure and low cost, and can be widely used in trucks with hydraulic retarders equipped with internal gear pumps.

[0025] Preferably, the pump seat plate 8 is made of aluminum alloy; the outer gear ring 1 and the inner gear ring 2 are made of alloy steel.

[0026] The production and installation process of this utility model:

[0027] The pump seat plate 8 is made of aluminum alloy; the outer gear ring 1 is made of alloy steel; the inner gear ring 2 is made of alloy steel; the transition sleeve 3 is cut from alloy round steel, and the outer spline teeth are processed on the outside, the center is processed into a round hole, and a keyway is processed; the power shaft 4 is coaxial with the retarder turbine shaft, and a keyway is processed at the installation position of the transition sleeve 3, and an outer snap ring 6 groove is processed at the right end of the keyway; the aluminum sealing plate is made of aluminum alloy. When installing, first install the flat key 5 on the power shaft 4, then install the transition sleeve 3, and install the outer snap ring 6 on the right end of the transition sleeve 3 for positioning. Install the outer gear ring 1 and the inner gear ring 2 on the pump seat plate 8, so that the inner spline of the inner gear ring 2 is fitted on the outer spline of the transition sleeve 3, and finally install the aluminum sealing plate 7.

[0028] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.

Claims

1. An internal gear pump power transmission device for an automobile hydraulic retarder, characterized in that: The invention comprises a pump seat plate (8), an outer gear ring (1), an inner gear ring (2), a transition sleeve (3), a power shaft (4) and an aluminum sealing plate (7); the inner ring of the transition sleeve (3) is a smooth cylindrical surface and is provided with a keyway, and the outer ring is a spline tooth; the outer ring of the inner gear ring (2) is an involute tooth, and the inner ring is a spline tooth; a keyway is also provided on the power shaft (4), and the transition sleeve (3) and the power shaft (4) are connected via a flat key (5); the inner gear ring (2) is sleeved on the transition sleeve (3); the outer gear ring (1), the inner gear ring (2) and the transition sleeve (3) are all arranged between the pump seat plate (8) and the aluminum sealing plate (7).

2. The internal gear pump power transmission device for a hydraulic retarder of an automobile according to claim 1, characterized in that: The outer gear ring (1) is mounted on the pump seat plate (8), and the inner gear ring (2) is mounted inside the outer gear ring (1) and meshes with the outer gear ring (1); the inner spline of the inner gear ring (2) is sleeved on the outer spline of the transition sleeve (3); and the aluminum sealing plate is mounted on the right end surface of the pump seat plate (8).

3. The internal gear pump power transmission device of the automobile hydraulic retarder according to claim 1, characterized in that: An external clamping ring (6) for positioning is installed at the right end of the transition sleeve (3).

4. The internal gear pump power transmission device for a hydraulic retarder of an automobile according to claim 1, characterized in that: The power shaft (4) is coaxial with the retarder turbine shaft.

5. The internal gear pump power transmission device for a hydraulic retarder of an automobile according to claim 1, characterized in that: The pump seat plate (8) is made of aluminum alloy; the outer gear ring (1) and the inner gear ring (2) are made of alloy steel.

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