Double-intermediate-shaft gearbox and retarder assembly

Abstract

The utility model belongs to the field of gearboxes, and particularly relates to a double-intermediate-shaft gearbox and a retarder assembly. The assembly comprises a gearbox shell, a gearbox rear cover installed at the rear end of the gearbox shell, a gearbox rear bearing cover installed on the gearbox rear cover, a retarder support installed on the gearbox rear bearing cover and a retarder installed on the retarder support. Two reinforcing bolts are arranged on the gearbox rear bearing cover; the two reinforcing bolts are respectively arranged on one sides of the two second retarder mounting holes; and two groups of first reinforcing ribs are arranged on the gearbox rear bearing cover. Aiming at the installation mode of the retarder on the current mainstream double-intermediate-shaft gearbox, the connection mode of the gearbox rear cover and the gearbox rear bearing cover is designed again, so that the rigidity of the gearbox-retarder assembly can be improved, the acceleration vibration and abnormal sound of the whole vehicle caused by the heavy load of the added eddy current retarder are effectively solved, and the service life of the whole vehicle is prolonged. And the riding experience of the whole vehicle and users is improved.

Description

Technical Field

[0001] The utility model relates to a gearbox, in particular to a double intermediate shaft gearbox and a retarder assembly. Background Art

[0002] The gearbox on the existing passenger car usually adopts a double intermediate shaft gearbox, and according to GB7258 motor vehicle safety technical conditions, passenger cars over 8 meters should be equipped with a retarder or other auxiliary braking device on the gearbox.

[0003] At present, domestic buses over 8 meters long are usually equipped with eddy current retarders or hydraulic retarders as auxiliary braking devices. Since eddy current retarders have better cost performance than hydraulic retarders, they are widely used in traditional buses. However, the stator of eddy current retarder is mainly wound with magnetic flux coils, which has a large weight load. At the same time, in order to improve the performance of the whole vehicle and optimize the space layout of the whole vehicle, the retarders of rear-mounted models are directly installed at the rear end of the gearbox.

[0004] However, the existing retarder is usually installed at the rear end of the gearbox in a cantilevered manner. When the weight of the retarder is large, the rigid modal change of the gearbox-retarder assembly is large, which can easily cause acceleration vibration or abnormal noise of the whole vehicle, affecting the user's riding experience.

[0005] Chinese patent CN212297507U discloses an improved dual intermediate shaft automobile transmission housing, including a transmission housing, the transmission housing is a truncated cone-shaped open housing structure, a transmission shaft hole is provided on the side of the transmission housing with a small cross section, an open structure is provided on the other side of the transmission housing, a noise reduction groove is provided on one side of the transmission shaft hole, the noise reduction groove is an annular inner groove structure, a number of transverse reinforcing ribs are evenly distributed inside the noise reduction groove at equal angles, a layer of sound diaphragm and shock absorbing cotton is fixed in the noise reduction groove by gluing, and a number of longitudinal reinforcing ribs are provided on the outer wall of the transmission housing. The longitudinal reinforcing ribs and transverse reinforcing ribs structure improve the structural strength, and the design of the noise reduction groove with sound diaphragm and shock absorbing cotton improves the seismic strength of the transmission housing, but does not solve the installation problem of the existing retarder. Utility Model Content

[0006] The purpose of the utility model is to solve the technical problem that the existing retarder is usually installed in a cantilevered manner at the rear end of the gearbox. When the weight of the retarder is large, the rigid modal change of the gearbox-retarder assembly is large, which is easy to cause acceleration vibration or abnormal noise of the whole vehicle, and to provide a double intermediate shaft gearbox and retarder assembly.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] A dual intermediate shaft gearbox and retarder assembly, comprising a gearbox housing, a gearbox rear cover mounted on the rear end of the gearbox housing, a gearbox rear bearing cover mounted on the gearbox rear cover, a retarder bracket mounted on the gearbox rear bearing cover, and a retarder mounted on the retarder bracket;

[0009] Two sets of bolts and two sets of retarder mounting holes are provided on the rear bearing cover of the gearbox, and the rear bearing cover of the gearbox is connected to the rear cover of the gearbox through the two sets of bolts; the two sets of retarder mounting holes are used to install the retarder bracket;

[0010] One group of bolts includes two first bolts, and the other group of bolts includes two second bolts; one group of retarder mounting holes includes two first retarder mounting holes, and the other group of retarder mounting holes includes two second retarder mounting holes; the two first retarder mounting holes and the two second retarder mounting holes are respectively arranged at four corners of the rear bearing cover of the gearbox, and the two first retarder mounting holes and the two second retarder mounting holes are respectively distributed along the diagonal of the rear bearing cover of the gearbox; the two first bolts are respectively arranged on one side of the two first retarder mounting holes; notches are respectively arranged on two opposite sides of the rear bearing cover of the gearbox, and the two second bolts are respectively arranged at the edges of the other two opposite sides of the rear bearing cover of the gearbox;

[0011] Its special features are:

[0012] Two reinforcing bolts are arranged on the rear bearing cover of the gearbox; the two reinforcing bolts are respectively arranged on one side of the two second retarder mounting holes, and are used to reinforce the connection between the rear bearing cover of the gearbox and the rear cover of the gearbox; two groups of first reinforcing ribs are arranged on the rear bearing cover of the gearbox; the number of first reinforcing ribs in each group is two; one ends of the two groups of first reinforcing ribs are respectively located at different positions at the center of the rear bearing cover of the gearbox, the other ends of the two first reinforcing ribs of the first group extend to the positions of the two first retarder mounting holes, and the other ends of the two first reinforcing ribs of the second group extend to the positions of the two second retarder mounting holes.

[0013] Furthermore, the two reinforcing bolts and the two first bolts are symmetrically arranged along the width direction of the rear bearing cover of the gearbox; the two first reinforcing ribs of the first group and the two first reinforcing ribs of the second group are symmetrically arranged along the width direction of the rear bearing cover of the gearbox.

[0014] Furthermore, two second reinforcing ribs are provided on the rear bearing cover of the gearbox; one ends of the two second reinforcing ribs are respectively located at different positions of the center of the rear bearing cover of the gearbox, and are staggered with the first reinforcing ribs, and the other ends of the two second reinforcing ribs extend toward the positions of the two second bolts.

[0015] The beneficial effects of the utility model are:

[0016] 1. Aiming at the installation method of the retarder on the current mainstream dual intermediate shaft gearbox, the utility model redesigns the connection method of the gearbox rear cover and the gearbox rear bearing cover, which can improve the rigidity of the gearbox-retarder assembly, effectively solve the acceleration vibration and abnormal noise of the whole vehicle caused by the heavy load of the eddy current retarder, and improve the riding experience of the whole vehicle and users.

[0017] 2. The first bolt and the reinforcing bolt of the utility model are evenly and symmetrically arranged to ensure the same strength of the connection force, and the first reinforcing rib extends to the center of the four retarder mounting holes, which also improves the support stiffness at the four retarder mounting holes, and can further improve the rigidity of the gearbox-retarder assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the axial structure of an existing double intermediate shaft gearbox;

[0019] Figure 2 It is a schematic diagram of the radial structure of an existing double intermediate shaft gearbox;

[0020] Figure 3 It is a structural schematic diagram of an embodiment of the utility model.

[0021] In the figure:

[0022] 01-gearbox housing, 02-gearbox rear cover, 03-gearbox rear bearing cover, 04-retarder bracket, 05-retarder, 06-first bolt, 07-second bolt, 08-first retarder mounting hole, 09-second retarder mounting hole;

[0023] 1- reinforcing bolt, 2- first reinforcing rib, 3- second reinforcing rib. DETAILED DESCRIPTION

[0024] In order to make the purpose, advantages and features of the utility model clearer, the following is a further detailed description of a dual intermediate shaft gearbox and retarder assembly proposed by the utility model in combination with the accompanying drawings and specific embodiments. According to the following specific implementation methods, the advantages and features of the utility model will be clearer.

[0025] In the description of the present invention, it should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] See also Figure 1 The existing double intermediate shaft gearbox generally includes a gearbox housing 01, a gearbox rear cover 02 installed at the rear end of the gearbox housing 01, a gearbox rear bearing cover 03 installed on the gearbox rear cover 02, a retarder bracket 04 installed on the gearbox rear bearing cover 03, and a retarder 05 installed on the retarder bracket 04.

[0027] See also Figure 2 In order to connect the transmission rear cover 02 with the transmission rear bearing cover 03, and the transmission rear bearing cover 03 with the retarder bracket 04, two groups of bolts and two groups of retarder mounting holes are provided on the transmission rear bearing cover 03; the transmission rear cover 02 and the transmission rear bearing cover 03 can be connected by the two groups of bolts, and the retarder bracket 04 can be easily installed by the retarder mounting holes.

[0028] Specifically, one group of bolts includes two first bolts 06 , and the other group of bolts includes two second bolts 07 ; one group of retarder mounting holes includes two first retarder mounting holes 08 , and the other group of retarder mounting holes includes two second retarder mounting holes 09 .

[0029] The two first retarder mounting holes 08 and the two second retarder mounting holes 09 are respectively arranged at the four corners of the gearbox rear bearing cover 03, and the two first retarder mounting holes 08 and the two second retarder mounting holes 09 are respectively distributed along the diagonals of the gearbox rear bearing cover 03, and the lines connecting the center points of the two first retarder mounting holes 08 and the two second retarder mounting holes 09 intersect.

[0030] In the existing design, due to the structural characteristics of the dual intermediate shaft gearbox, the gearbox rear cover 02 and the gearbox rear bearing cover 03 actually wrap the main shaft bearing and two symmetrical intermediate shaft bearings. The three bearings are linearly distributed, and the bolts used to connect the gearbox rear bearing cover 03 and the gearbox rear cover 02 are also distributed around the three bearings. Figure 2 As shown, two first bolts 06 are respectively arranged on one side of two first retarder mounting holes 08; notches are respectively arranged on two opposite sides of the gearbox rear bearing cover 03, and two second bolts 07 are respectively arranged at the edges of the other two opposite sides of the gearbox rear bearing cover 03. Since the first bolts 06 and the second bolts 07 are relatively close in distribution, the connection rigidity at the first retarder mounting hole 08 is obviously better, while the bolts around the second retarder mounting hole 09 are relatively sparsely arranged, presenting an obvious cantilever shape. Therefore, when the load of the retarder 05 installed at the rear end is large, the rigidity change between the first retarder mounting hole 08 and the second retarder mounting hole 08 is relatively large, and the uneven change forms the fundamental cause of the acceleration vibration and abnormal noise of the whole vehicle.

[0031] To solve this problem, see Figure 3 In this embodiment, two reinforcing bolts 1 are arranged on the transmission rear bearing cover 03; the two reinforcing bolts 1 are respectively arranged on one side of the second retarder mounting hole 09; and the two reinforcing bolts 1 and the two first bolts 06 are symmetrically arranged along the width direction of the transmission rear bearing cover 03. The width direction of the transmission rear bearing cover 3 described in this embodiment is Figure 2 and Figure 3 Horizontal direction on the middle paper.

[0032] Two groups of first reinforcing ribs 2 and one group of second reinforcing ribs 3 are arranged on the gearbox rear bearing cover 03; the number of each group of first reinforcing ribs 2 and second reinforcing ribs 3 is two.

[0033] One ends of two groups of first reinforcing ribs 2 and one group of second reinforcing ribs 3 are respectively located at different positions of the center of the gearbox rear bearing cover 03, and are distributed along the circumferential direction. The other ends of the two first reinforcing ribs 2 of the first group extend to the positions of the two first retarder mounting holes 08, and the two first reinforcing ribs 2 of the first group are located on the line between the center points of the two first retarder mounting holes 08; the other ends of the two first reinforcing ribs 2 of the second group extend to the positions of the two second retarder mounting holes 09, and the two first reinforcing ribs 2 of the second group are located on the line between the center points of the second retarder mounting holes 09; one ends of the two second reinforcing ribs 3 are respectively located at different positions of the center of the gearbox rear bearing cover 03, and the other ends extend to the positions of the two second bolts 07.

[0034] For ease of expression, in this embodiment, the midpoints of the other two opposite sides of the gearbox rear bearing cover 03 are defined as marking points, the direction of the marking point close to one corner of the corresponding side is upward, and the direction of the marking point close to the other corner of the corresponding side is downward; one of the second bolts 07 is located above the corresponding marking point, and the other second bolt 07 is located below the corresponding marking point; the second reinforcement rib 3 is located on the line connecting the center points of the two second bolts 07.

[0035] Through the design of this embodiment, the bolts around the four retarder mounting holes on the rear bearing cover 03 of the gearbox are made uniform and symmetrical, ensuring the same connection force strength, and the first reinforcing rib 2 extends to the hole centers of the four retarder mounting holes, and also improves the supporting stiffness of the four retarder mounting holes. It can fundamentally improve and solve the problem of vehicle vibration and abnormal noise caused by the rigid modal change of the existing dual intermediate shaft gearbox output end adapter retarder 05, thereby improving the vehicle matching quality and user subjective experience.

Claims

1. A dual intermediate shaft gearbox and retarder assembly, comprising a gearbox housing (01), a gearbox rear cover (02) mounted on the rear end of the gearbox housing (01), a gearbox rear bearing cover (03) mounted on the gearbox rear cover (02), a retarder bracket (04) mounted on the gearbox rear bearing cover (03), and a retarder (05) mounted on the retarder bracket (04); The transmission rear bearing cover (03) is provided with two groups of bolts and two groups of retarder mounting holes, and the transmission rear bearing cover (03) is connected to the transmission rear cover (02) via the two groups of bolts; the retarder bracket (04) is mounted on the transmission rear bearing cover (03) via the two groups of retarder mounting holes; One group of bolts includes two first bolts (06), and the other group of bolts includes two second bolts (07); one group of retarder mounting holes includes two first retarder mounting holes (08), and the other group of retarder mounting holes includes two second retarder mounting holes (09); The two first retarder mounting holes (08) and the two second retarder mounting holes (09) are respectively arranged at four corners of the gearbox rear bearing cover (03), and the two first retarder mounting holes (08) and the two second retarder mounting holes (09) are respectively distributed diagonally along the surface of the gearbox rear bearing cover (03); The two first bolts (06) are respectively arranged on one side of the two first retarder mounting holes (08); notches are respectively arranged on two opposite sides of the gearbox rear bearing cover (03); and the two second bolts (07) are respectively arranged on the edges of the other two opposite sides of the gearbox rear bearing cover (03); Features: The gearbox rear bearing cover (03) is provided with two reinforcing bolts (1) and two groups of first reinforcing ribs (2); The two reinforcing bolts (1) are respectively arranged on one side of the two second retarder mounting holes (09) and are used to reinforce the connection between the gearbox rear bearing cover (03) and the gearbox rear cover (02); The number of the first reinforcing ribs (2) in the two groups is two; One ends of the two groups of the first reinforcing ribs (2) are respectively located at different positions at the center of the gearbox rear bearing cover (03), the other ends of the two first reinforcing ribs (2) of the first group extend to the positions of the two first retarder mounting holes (08), and the other ends of the two first reinforcing ribs (2) of the second group extend to the positions of the two second retarder mounting holes (09).

2. A dual intermediate shaft gearbox and retarder assembly according to claim 1, characterized in that: The two reinforcing bolts (1) and the two first bolts (06) are symmetrically arranged along the width direction of the gearbox rear bearing cover (03); The two first reinforcing ribs (2) of the first group and the two first reinforcing ribs (2) of the second group are symmetrically arranged along the width direction of the gearbox rear bearing cover (03).

3. A dual intermediate shaft gearbox and retarder assembly according to claim 1 or 2, characterized in that: The gearbox rear bearing cover (03) is also provided with two second reinforcing ribs (3); One end of the two second reinforcing ribs (3) is located at different positions at the center of the gearbox rear bearing cover (03) and is arranged offset from the first reinforcing rib (2), and the other ends of the two second reinforcing ribs (3) extend toward the positions of the two second bolts (07).

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