Integrated reverse gear shifting structure smooth in gear shifting

Abstract

The utility model relates to a gear reversing and shifting structure, and provides an integrated gear reversing and shifting structure which is smooth in gear shifting in order to solve the problems that an existing gear reversing structure is high in cost, mostly has clamping stagnation, or is complex in structure and difficult to assemble. The gear shifting mechanism comprises a reverse gear, a reverse intermediate gear and an output reverse gear which are sequentially meshed, a reverse intermediate shaft is arranged in the middle of the reverse intermediate gear, an output shaft is arranged in the middle of the output reverse gear, an annular boss is arranged on the side, away from meshing teeth, of the reverse intermediate gear, and an annular gear shifting groove is formed in the boss. A first tooth end face of one side of the reverse gear intermediate gear, which is hung into the output reverse gear, and a second tooth end face of one side of the output reverse gear, which is close to the reverse gear intermediate gear, are respectively in an axial convex shape with a high middle part and two low sides, the middle part is in a corner angle shape, and symmetrical arc transition surfaces are arranged between the two sides and the tooth surfaces of the corresponding gears; and the reverse gear intermediate gear is in running fit with the reverse gear intermediate shaft.

Description

Technical Field

[0001] The utility model relates to a reverse gear shifting structure, in particular to an integrated reverse gear shifting structure with smooth gear shifting. Background Art

[0002] Reverse gear is a functional driving gear for the vehicle to reverse. In a mechanical or electronically controlled mechanical transmission, an intermediate reverse gear is usually provided between the input reverse gear and the output reverse gear to achieve power reversal, and a set of synchronizers or a sliding sleeve structure is provided on the output reverse gear side to achieve the gear shifting and disengaging functions. The above structure is stable and has a wide range of applications, but the overall structure has a large number of parts and a high cost; and if a sliding sleeve structure is used, there may be a phenomenon of stagnation or difficulty in shifting gears during the actual shifting process.

[0003] Chinese patent CN218236039U discloses a single-support structure of a reverse gear intermediate shaft assembly, including a reverse gear intermediate shaft, a needle roller bearing and a transmission housing, wherein the reverse gear intermediate shaft passes through the inner hole of the needle roller bearing and the transmission housing, the needle roller bearing is installed in the reverse gear intermediate intermediate gear, one end of the reverse gear intermediate shaft protrudes outward, and the other end is threaded, and a locking structure is provided at one end of the reverse gear intermediate shaft, and a reverse gear intermediate shaft gasket for locking contacts with the transmission housing; the other end of the reverse gear intermediate shaft protrudes outward, and the protruding part contacts with the reverse gear intermediate intermediate gear, and does not contact with the transmission housing.

[0004] Chinese patent CN104791431B discloses a reverse gear mechanism for an automobile transmission with easier reverse gear shifting, wherein the reverse gear shaft is assembled between the reverse gear shaft front bearing and the reverse gear shaft rear bearing, and the reverse gear shaft front bearing and the reverse gear shaft rear bearing are connected to the transmission case; the reverse gear shaft gasket, the reverse gear needle roller bearing, the reverse gear synchronizer and the reverse gear are assembled on the reverse gear shaft from left to right; the reverse gear idler gear clearance is assembled on the reverse gear needle roller bearing; the reverse gear synchronizer can move axially and can mesh with the reverse gear idler; the reverse gear of the intermediate shaft is located between the second gear of the intermediate shaft and the fifth gear of the intermediate shaft and meshes with the reverse gear on the reverse gear shaft.

[0005] However, the common disadvantages of the above-mentioned prior arts are: complex structure and difficult assembly. Utility Model Content

[0006] The purpose of the utility model is to solve the technical problems of the existing reverse gear structure, such as the large number of overall structural parts, high cost, possible jamming, or complex structure and difficult assembly, and to provide an integrated reverse gear shifting structure with smooth gear shifting.

[0007] The design concept of the utility model is as follows: the reverse gear sliding sleeve function and the reverse gear seat function are sequentially integrated on the intermediate shaft reverse gear and the output reverse gear; at the same time, the gear end faces of the intermediate shaft reverse gear and the output reverse gear adopt an inverted cone tooth structure, and the tooth end faces adopt a symmetrical "pointed arc surface" structure, so as to reduce costs, improve the smoothness of gear shifting, and reduce the occurrence rate of gear shifting jamming.

[0008] In order to achieve the above purpose and complete the above concept, the technical solution provided by the utility model is:

[0009] An integrated reverse gear shifting structure with smooth gear shifting comprises a reverse gear, a reverse gear intermediate gear and an output reverse gear gear meshed in sequence, wherein a reverse gear intermediate shaft is arranged in the middle of the reverse gear intermediate gear, and an output shaft is arranged in the middle of the output reverse gear. The structure is special in that:

[0010] The reverse gear intermediate gear is provided with a circular boss on the side away from the meshing teeth, and a circular shift groove is provided on the boss, and the shift groove is used to cooperate with the shift fork so that the reverse gear intermediate gear moves axially along the reverse gear intermediate shaft; the first tooth end face of the reverse gear intermediate gear on the side where the output reverse gear gear is engaged, and the second tooth end face of the output reverse gear gear close to the reverse gear intermediate gear are both axially convex shapes with a high middle part and low sides, the middle part is angular, and the two sides are symmetrical arc transition surfaces with the tooth surfaces of the corresponding gears; the reverse gear intermediate gear is rotationally matched with the reverse gear intermediate shaft.

[0011] Furthermore, the tooth profile cross-sections of the reverse gear intermediate gear and the output reverse gear gear are both inverted cone teeth.

[0012] Furthermore, the angular angular line is an arc line with the top bent axially inwardly of the corresponding gear shaft.

[0013] Furthermore, a wear-resistant bushing is arranged between the reverse gear intermediate gear and the reverse gear intermediate shaft.

[0014] Furthermore, the output reverse gear is connected to the output shaft by means of a spline or an interference fit.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The utility model provides an integrated and smooth-shifting reverse gear shifting structure, which integrates the existing reverse gear sliding sleeve function and reverse gear seat function on the reverse gear intermediate gear and the output reverse gear gear, wherein the reverse gear intermediate gear is provided with a shifting groove, and the structure uses a small number of gear parts and has a low cost;

[0017] 2. The integrated and smooth-shifting reverse gear shifting structure provided by the utility model has a first tooth end face and a second tooth end face that both adopt a "pointed arc surface" structure, that is, the first tooth end face of the reverse gear intermediate gear that is engaged with the output reverse gear gear, and the second tooth end face of the output reverse gear gear that is close to the reverse gear intermediate gear are both axially convex shapes with a high middle part and low sides, the middle part is angular, and the two sides are symmetrical arc transition surfaces with the tooth surfaces of the corresponding gears. This structure can effectively reduce the occurrence rate of the phenomenon of reverse gear sticking or difficulty in shifting gears;

[0018] 3. The integrated reverse gear shifting structure with smooth gear shifting provided by the utility model can be applied to various mechanical or electronically controlled mechanical transmissions and has a wide range of applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the embodiment of the integrated and smooth-shifting reverse gear shifting structure of the utility model when it is in neutral gear or forward gear;

[0020] Figure 2 for Figure 1 Right view of;

[0021] Figure 3 It is a structural schematic diagram of an embodiment of the integrated and smooth-shifting reverse gear shifting structure of the utility model when it is in reverse gear;

[0022] Figure 4 It is a structural schematic diagram of the reverse gear intermediate gear in the embodiment of the integrated and smooth-shifting reverse gear shifting structure of the utility model;

[0023] Figure 5 for Figure 4 sectional view of

[0024] Figure 6 It is a schematic diagram of the embodiment of the integrated and smooth-shifting reverse gear shifting structure of the utility model when the first tooth end face and the second tooth end face begin to mesh;

[0025] Figure 7 It is a schematic diagram of the embodiment of the integrated and smooth-shifting reverse gear shifting structure of the utility model after the first tooth end face and the second tooth end face have finished meshing;

[0026] Figure 8 It is a structural schematic diagram of the reverse gear intermediate gear of an embodiment of the integrated and smooth-shifting reverse gear shifting structure of the utility model;

[0027] Description of reference numerals:

[0028] 1-input reverse gear, 2-reverse gear intermediate shaft, 3-reverse gear intermediate gear, 4-output shaft, 5-output reverse gear, 6-wear-resistant bushing, 7-shift groove, 8-first tooth end face, 9-second tooth end face. DETAILED DESCRIPTION

[0029] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] An integrated and smooth-shifting reverse gear shifting structure, see Figures 1 to 8 , comprising a reverse gear 1, a reverse intermediate gear 3 and an output reverse gear 5 meshed in sequence, wherein a reverse intermediate shaft 2 is arranged in the middle of the reverse intermediate gear 3, and an output shaft 4 is arranged in the middle of the output reverse gear 5, characterized in that: a circular boss is arranged on the side of the reverse intermediate gear 3 away from the meshing teeth, and a circular shift groove 7 is arranged on the boss, and the shift groove 7 is used to cooperate with the shift fork so that the reverse intermediate gear 3 moves axially along the reverse intermediate shaft 2; the first tooth end face 8 of the reverse intermediate gear 3 on the side where the output reverse gear 5 is engaged, and the second tooth end face 9 of the output reverse gear 5 on the side close to the reverse intermediate gear 3 are both axially convex shapes with a high middle part and low sides, the middle part is angular, and the two sides are symmetrical arc transition surfaces with the tooth surfaces of the corresponding gears; the reverse intermediate gear 3 is rotationally matched with the reverse intermediate shaft 2.

[0031] In this embodiment, a wear-resistant bushing 6 is provided between the reverse intermediate gear 3 and the reverse intermediate shaft 2, which can reduce the wear between the reverse intermediate gear 3 and the reverse intermediate shaft 2; the output reverse gear 5 is connected to the output shaft 4 by a spline, and the fit is tight. The tooth profile sections of the reverse intermediate gear 3 and the output reverse gear 5 are both inverted cone teeth; the angular angular lines are arc lines with the top bent toward the axial inner side of the corresponding gear shaft, which can effectively reduce the occurrence rate of the phenomenon of reverse gear sticking or gear shifting difficulty.

[0032] After assembly, the actual gear position status of this embodiment is described as follows:

[0033] 1) When in neutral or forward gear, the state of the reverse gear shift mechanism is as follows Figure 2 As shown, the reverse gear intermediate gear 3 is in a constant meshing state with the input reverse gear 1 , and the reverse gear intermediate gear 3 is in a non-meshing state with the output reverse gear 5 ; at this time, the reverse gear intermediate gear 3 is idling, and no power is transmitted to the output shaft 4 .

[0034] 2) When the reverse gear is engaged, the state of the reverse gear shift mechanism is as follows: Figure 3 As shown, the shift fork drives the reverse gear intermediate gear 3 to move axially through the shift groove 7 to mesh with the output reverse gear 5, and the power is reversed through the intermediate gear 3 and transmitted to the output reverse gear 5 and the output shaft 4.

[0035] like Figure 6 and Figure 7As shown, in the above-mentioned meshing process, the arc transition surface of the first tooth end face 8 and the second tooth end face 9 converts the contact sliding resistance into partial rolling resistance, so that the total resistance is reduced, which is conducive to shifting into the reverse gear; the sharp angle structure is conducive to reducing the probability of the output reverse gear 5 facing the intermediate gear 3, and reducing the occurrence rate of sticking during gear shifting.

[0036] It should be noted that the above is only a specific implementation method of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions based on the specific implementation methods disclosed in the utility model, and these modifications or substitutions should be included in the protection scope of the utility model.

Claims

1. An integrated reverse gear shifting structure with smooth gear shifting, comprising a reverse gear (1), a reverse gear intermediate gear (3) and an output reverse gear (5) meshed in sequence, wherein a reverse gear intermediate shaft (2) is arranged in the middle of the reverse gear intermediate gear (3), and an output shaft (4) is arranged in the middle of the output reverse gear (5), characterized in that: A circular boss is provided on the side of the reverse gear intermediate gear (3) away from the meshing teeth, and a circular shift groove (7) is provided on the boss. The shift groove (7) is used to cooperate with the shift fork so that the reverse gear intermediate gear (3) moves axially along the reverse gear intermediate shaft (2); The first tooth end face (8) of the reverse gear intermediate gear (3) on the side where the reverse gear output gear (5) is engaged, and the second tooth end face (9) of the reverse gear output gear (5) on the side close to the reverse gear intermediate gear (3) are both axially convex with a high middle portion and low sides, the middle portion is angular, and the two sides are symmetrical arc transition surfaces with the tooth surfaces of the corresponding gears; The reverse gear intermediate gear (3) is rotationally matched with the reverse gear intermediate shaft (2).

2. The integrated and smooth-shifting reverse gear shifting structure according to claim 1 is characterized in that: The reverse gear intermediate gear (3) and the output reverse gear gear (5) are both inverted bevel gears.

3. The integrated and smooth-shifting reverse gear shifting structure according to claim 2 is characterized in that: The angular angular line is an arc line with a top portion bent toward the axial inner side of the corresponding gear shaft.

4. The integrated reverse gear shifting structure with smooth gear shifting according to any one of claims 1 to 3, characterized in that: A wear-resistant bushing (6) is arranged between the reverse gear intermediate gear (3) and the reverse gear intermediate shaft (2).

5. The integrated and smooth-shifting reverse gear shifting structure according to claim 4 is characterized in that: The output reverse gear (5) is connected to the output shaft (4) by means of a spline or interference fit.

Images